./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/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 d5d3c0f581b3d52ccfb3e43d6fb6458a66cd40c307750c0d7336040b60b78e76 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:49:08,736 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:49:08,738 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:49:08,787 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:49:08,788 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:49:08,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:49:08,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:49:08,798 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:49:08,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:49:08,806 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:49:08,807 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:49:08,809 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:49:08,810 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:49:08,812 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:49:08,815 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:49:08,819 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:49:08,821 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:49:08,822 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:49:08,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:49:08,832 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:49:08,834 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:49:08,835 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:49:08,838 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:49:08,839 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:49:08,848 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:49:08,848 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:49:08,849 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:49:08,851 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:49:08,851 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:49:08,853 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:49:08,854 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:49:08,855 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:49:08,857 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:49:08,858 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:49:08,859 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:49:08,859 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:49:08,860 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:49:08,860 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:49:08,861 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:49:08,861 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:49:08,862 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:49:08,863 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:49:08,899 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:49:08,899 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:49:08,899 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:49:08,900 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:49:08,900 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:49:08,900 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:49:08,901 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:49:08,901 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:49:08,901 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:49:08,901 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:49:08,901 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:49:08,902 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:49:08,902 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:49:08,902 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:49:08,902 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:49:08,902 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:49:08,903 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:49:08,903 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:49:08,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:49:08,904 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:49:08,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:49:08,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:49:08,904 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:49:08,904 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:49:08,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:49:08,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:49:08,905 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:49:08,905 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:49:08,905 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:49:08,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:49:08,906 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:49:08,906 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:49:08,906 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:08,907 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:49:08,907 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:49:08,907 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:49:08,907 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:49:08,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:49:08,907 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:49:08,908 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:49:08,908 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:49:08,908 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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d5d3c0f581b3d52ccfb3e43d6fb6458a66cd40c307750c0d7336040b60b78e76 [2021-11-20 22:49:09,185 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:49:09,215 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:49:09,218 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:49:09,219 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:49:09,220 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:49:09,222 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.c [2021-11-20 22:49:09,302 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/data/aa51066f5/74475d7a74ae402eb9db14caa4b2b703/FLAGa464593b5 [2021-11-20 22:49:09,930 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:49:09,931 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.c [2021-11-20 22:49:09,971 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/data/aa51066f5/74475d7a74ae402eb9db14caa4b2b703/FLAGa464593b5 [2021-11-20 22:49:10,142 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/data/aa51066f5/74475d7a74ae402eb9db14caa4b2b703 [2021-11-20 22:49:10,145 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:49:10,147 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:49:10,153 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:10,153 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:49:10,156 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:49:10,157 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:10,159 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2766080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10, skipping insertion in model container [2021-11-20 22:49:10,160 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:10,167 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:49:10,261 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:49:10,736 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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.c[46529,46542] [2021-11-20 22:49:10,827 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:10,837 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:49:10,929 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_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/sv-benchmarks/c/product-lines/elevator_spec9_product26.cil.c[46529,46542] [2021-11-20 22:49:10,957 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:10,995 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:49:10,999 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10 WrapperNode [2021-11-20 22:49:10,999 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:11,000 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:11,000 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:49:11,000 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:49:11,008 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,053 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,124 INFO L137 Inliner]: procedures = 93, calls = 337, calls flagged for inlining = 27, calls inlined = 23, statements flattened = 814 [2021-11-20 22:49:11,134 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:11,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:49:11,136 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:49:11,136 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:49:11,144 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,145 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,160 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,202 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,216 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,236 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,250 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:49:11,257 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:49:11,257 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:49:11,258 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:49:11,259 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (1/1) ... [2021-11-20 22:49:11,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:11,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:11,301 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:49:11,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:49:11,347 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:49:11,347 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-20 22:49:11,347 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-20 22:49:11,347 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-20 22:49:11,348 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-20 22:49:11,348 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-20 22:49:11,348 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-20 22:49:11,348 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-20 22:49:11,348 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-20 22:49:11,349 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-20 22:49:11,349 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-20 22:49:11,349 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-20 22:49:11,349 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-20 22:49:11,349 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-20 22:49:11,350 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-20 22:49:11,350 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-20 22:49:11,350 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-20 22:49:11,350 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-20 22:49:11,351 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-20 22:49:11,351 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-20 22:49:11,351 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-20 22:49:11,351 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-20 22:49:11,351 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-20 22:49:11,352 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-20 22:49:11,352 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-20 22:49:11,352 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-20 22:49:11,352 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-20 22:49:11,352 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-20 22:49:11,353 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-20 22:49:11,353 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__empty [2021-11-20 22:49:11,353 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__empty [2021-11-20 22:49:11,353 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-20 22:49:11,353 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-20 22:49:11,354 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-20 22:49:11,354 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-20 22:49:11,354 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-20 22:49:11,354 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-20 22:49:11,354 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-20 22:49:11,355 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-20 22:49:11,355 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:49:11,355 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-20 22:49:11,355 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-20 22:49:11,355 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-20 22:49:11,356 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-20 22:49:11,356 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-20 22:49:11,356 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-20 22:49:11,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:49:11,356 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:49:11,357 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-20 22:49:11,357 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-20 22:49:11,547 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:49:11,552 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:49:12,544 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:49:13,144 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:49:13,149 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 22:49:13,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:13 BoogieIcfgContainer [2021-11-20 22:49:13,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:49:13,158 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:49:13,158 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:49:13,161 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:49:13,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:49:10" (1/3) ... [2021-11-20 22:49:13,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d35fd9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:13, skipping insertion in model container [2021-11-20 22:49:13,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:10" (2/3) ... [2021-11-20 22:49:13,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d35fd9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:13, skipping insertion in model container [2021-11-20 22:49:13,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:13" (3/3) ... [2021-11-20 22:49:13,165 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product26.cil.c [2021-11-20 22:49:13,174 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:49:13,174 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:49:13,230 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:49:13,236 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 22:49:13,237 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:49:13,264 INFO L276 IsEmpty]: Start isEmpty. Operand has 351 states, 237 states have (on average 1.6118143459915613) internal successors, (382), 260 states have internal predecessors, (382), 89 states have call successors, (89), 23 states have call predecessors, (89), 23 states have return successors, (89), 82 states have call predecessors, (89), 89 states have call successors, (89) [2021-11-20 22:49:13,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 22:49:13,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:13,277 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 22:49:13,278 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:13,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:13,283 INFO L85 PathProgramCache]: Analyzing trace with hash 298484545, now seen corresponding path program 1 times [2021-11-20 22:49:13,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:13,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194410619] [2021-11-20 22:49:13,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:13,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:13,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:13,741 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 22:49:13,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:13,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194410619] [2021-11-20 22:49:13,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194410619] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:13,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:13,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:49:13,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375222440] [2021-11-20 22:49:13,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:13,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 22:49:13,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:13,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 22:49:13,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 22:49:13,796 INFO L87 Difference]: Start difference. First operand has 351 states, 237 states have (on average 1.6118143459915613) internal successors, (382), 260 states have internal predecessors, (382), 89 states have call successors, (89), 23 states have call predecessors, (89), 23 states have return successors, (89), 82 states have call predecessors, (89), 89 states have call successors, (89) Second operand has 2 states, 2 states have (on average 12.0) internal successors, (24), 2 states have internal predecessors, (24), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-20 22:49:14,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:14,002 INFO L93 Difference]: Finished difference Result 369 states and 587 transitions. [2021-11-20 22:49:14,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 22:49:14,004 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 12.0) internal successors, (24), 2 states have internal predecessors, (24), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) Word has length 39 [2021-11-20 22:49:14,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:14,030 INFO L225 Difference]: With dead ends: 369 [2021-11-20 22:49:14,030 INFO L226 Difference]: Without dead ends: 347 [2021-11-20 22:49:14,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 22:49:14,038 INFO L933 BasicCegarLoop]: 516 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 516 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:14,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 516 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:14,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-11-20 22:49:14,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2021-11-20 22:49:14,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 235 states have (on average 1.6) internal successors, (376), 256 states have internal predecessors, (376), 89 states have call successors, (89), 23 states have call predecessors, (89), 22 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-20 22:49:14,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 549 transitions. [2021-11-20 22:49:14,165 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 549 transitions. Word has length 39 [2021-11-20 22:49:14,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:14,167 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 549 transitions. [2021-11-20 22:49:14,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 12.0) internal successors, (24), 2 states have internal predecessors, (24), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-20 22:49:14,167 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 549 transitions. [2021-11-20 22:49:14,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 22:49:14,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:14,179 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 22:49:14,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:49:14,179 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:14,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:14,180 INFO L85 PathProgramCache]: Analyzing trace with hash -237321169, now seen corresponding path program 1 times [2021-11-20 22:49:14,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:14,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258509673] [2021-11-20 22:49:14,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:14,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:14,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:14,456 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 22:49:14,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:14,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258509673] [2021-11-20 22:49:14,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258509673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:14,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:14,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 22:49:14,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727962557] [2021-11-20 22:49:14,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:14,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 22:49:14,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:14,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 22:49:14,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:49:14,463 INFO L87 Difference]: Start difference. First operand 347 states and 549 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-20 22:49:16,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:16,461 INFO L93 Difference]: Finished difference Result 1123 states and 1814 transitions. [2021-11-20 22:49:16,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 22:49:16,461 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 40 [2021-11-20 22:49:16,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:16,469 INFO L225 Difference]: With dead ends: 1123 [2021-11-20 22:49:16,469 INFO L226 Difference]: Without dead ends: 792 [2021-11-20 22:49:16,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-20 22:49:16,475 INFO L933 BasicCegarLoop]: 535 mSDtfsCounter, 1450 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1182 mSolverCounterSat, 543 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1507 SdHoareTripleChecker+Valid, 1140 SdHoareTripleChecker+Invalid, 1725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 543 IncrementalHoareTripleChecker+Valid, 1182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:16,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1507 Valid, 1140 Invalid, 1725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [543 Valid, 1182 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-20 22:49:16,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2021-11-20 22:49:16,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 695. [2021-11-20 22:49:16,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 491 states have (on average 1.6191446028513239) internal successors, (795), 521 states have internal predecessors, (795), 163 states have call successors, (163), 39 states have call predecessors, (163), 40 states have return successors, (165), 147 states have call predecessors, (165), 158 states have call successors, (165) [2021-11-20 22:49:16,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 1123 transitions. [2021-11-20 22:49:16,538 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 1123 transitions. Word has length 40 [2021-11-20 22:49:16,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:16,538 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 1123 transitions. [2021-11-20 22:49:16,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-20 22:49:16,539 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 1123 transitions. [2021-11-20 22:49:16,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-20 22:49:16,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:16,552 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] [2021-11-20 22:49:16,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 22:49:16,552 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:16,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:16,554 INFO L85 PathProgramCache]: Analyzing trace with hash -913699253, now seen corresponding path program 1 times [2021-11-20 22:49:16,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:16,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184680344] [2021-11-20 22:49:16,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:16,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:16,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:16,690 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 22:49:16,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:16,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184680344] [2021-11-20 22:49:16,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184680344] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:16,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:16,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 22:49:16,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027377972] [2021-11-20 22:49:16,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:16,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 22:49:16,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:16,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 22:49:16,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-20 22:49:16,693 INFO L87 Difference]: Start difference. First operand 695 states and 1123 transitions. Second operand has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 5 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-20 22:49:18,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:18,828 INFO L93 Difference]: Finished difference Result 2349 states and 3843 transitions. [2021-11-20 22:49:18,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 22:49:18,829 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 5 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 62 [2021-11-20 22:49:18,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:18,849 INFO L225 Difference]: With dead ends: 2349 [2021-11-20 22:49:18,849 INFO L226 Difference]: Without dead ends: 1671 [2021-11-20 22:49:18,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2021-11-20 22:49:18,861 INFO L933 BasicCegarLoop]: 703 mSDtfsCounter, 1604 mSDsluCounter, 1355 mSDsCounter, 0 mSdLazyCounter, 2038 mSolverCounterSat, 514 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1661 SdHoareTripleChecker+Valid, 1958 SdHoareTripleChecker+Invalid, 2552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 514 IncrementalHoareTripleChecker+Valid, 2038 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:18,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1661 Valid, 1958 Invalid, 2552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [514 Valid, 2038 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 22:49:18,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1671 states. [2021-11-20 22:49:18,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1671 to 1602. [2021-11-20 22:49:19,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1602 states, 1161 states have (on average 1.6391042204995694) internal successors, (1903), 1221 states have internal predecessors, (1903), 348 states have call successors, (348), 81 states have call predecessors, (348), 92 states have return successors, (375), 323 states have call predecessors, (375), 343 states have call successors, (375) [2021-11-20 22:49:19,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1602 states to 1602 states and 2626 transitions. [2021-11-20 22:49:19,028 INFO L78 Accepts]: Start accepts. Automaton has 1602 states and 2626 transitions. Word has length 62 [2021-11-20 22:49:19,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:19,028 INFO L470 AbstractCegarLoop]: Abstraction has 1602 states and 2626 transitions. [2021-11-20 22:49:19,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 5 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-20 22:49:19,029 INFO L276 IsEmpty]: Start isEmpty. Operand 1602 states and 2626 transitions. [2021-11-20 22:49:19,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 22:49:19,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:19,034 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] [2021-11-20 22:49:19,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 22:49:19,035 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:19,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:19,036 INFO L85 PathProgramCache]: Analyzing trace with hash 502985922, now seen corresponding path program 1 times [2021-11-20 22:49:19,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:19,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899223632] [2021-11-20 22:49:19,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:19,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:19,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:19,228 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 22:49:19,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:19,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899223632] [2021-11-20 22:49:19,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899223632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:19,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:19,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 22:49:19,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348484670] [2021-11-20 22:49:19,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:19,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 22:49:19,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:19,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 22:49:19,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-20 22:49:19,232 INFO L87 Difference]: Start difference. First operand 1602 states and 2626 transitions. Second operand has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 7 states have internal predecessors, (40), 5 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 22:49:21,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:21,960 INFO L93 Difference]: Finished difference Result 4375 states and 7183 transitions. [2021-11-20 22:49:21,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 22:49:21,961 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 7 states have internal predecessors, (40), 5 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 65 [2021-11-20 22:49:21,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:21,982 INFO L225 Difference]: With dead ends: 4375 [2021-11-20 22:49:21,983 INFO L226 Difference]: Without dead ends: 2789 [2021-11-20 22:49:21,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-20 22:49:21,994 INFO L933 BasicCegarLoop]: 824 mSDtfsCounter, 1182 mSDsluCounter, 1492 mSDsCounter, 0 mSdLazyCounter, 3628 mSolverCounterSat, 602 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1247 SdHoareTripleChecker+Valid, 2206 SdHoareTripleChecker+Invalid, 4230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 602 IncrementalHoareTripleChecker+Valid, 3628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:21,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1247 Valid, 2206 Invalid, 4230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [602 Valid, 3628 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-20 22:49:21,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2789 states. [2021-11-20 22:49:22,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2789 to 2636. [2021-11-20 22:49:22,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2636 states, 1882 states have (on average 1.626461211477152) internal successors, (3061), 1985 states have internal predecessors, (3061), 608 states have call successors, (608), 121 states have call predecessors, (608), 145 states have return successors, (653), 574 states have call predecessors, (653), 603 states have call successors, (653) [2021-11-20 22:49:22,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2636 states to 2636 states and 4322 transitions. [2021-11-20 22:49:22,242 INFO L78 Accepts]: Start accepts. Automaton has 2636 states and 4322 transitions. Word has length 65 [2021-11-20 22:49:22,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:22,242 INFO L470 AbstractCegarLoop]: Abstraction has 2636 states and 4322 transitions. [2021-11-20 22:49:22,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 7 states have internal predecessors, (40), 5 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 22:49:22,243 INFO L276 IsEmpty]: Start isEmpty. Operand 2636 states and 4322 transitions. [2021-11-20 22:49:22,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-20 22:49:22,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:22,246 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:22,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 22:49:22,246 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:22,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:22,247 INFO L85 PathProgramCache]: Analyzing trace with hash 1771585727, now seen corresponding path program 1 times [2021-11-20 22:49:22,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:22,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485817589] [2021-11-20 22:49:22,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:22,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:22,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:22,338 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 22:49:22,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:22,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485817589] [2021-11-20 22:49:22,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485817589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:22,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:22,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 22:49:22,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793011456] [2021-11-20 22:49:22,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:22,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 22:49:22,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:22,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 22:49:22,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:49:22,342 INFO L87 Difference]: Start difference. First operand 2636 states and 4322 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-20 22:49:22,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:22,596 INFO L93 Difference]: Finished difference Result 4674 states and 7681 transitions. [2021-11-20 22:49:22,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:49:22,597 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) Word has length 66 [2021-11-20 22:49:22,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:22,625 INFO L225 Difference]: With dead ends: 4674 [2021-11-20 22:49:22,625 INFO L226 Difference]: Without dead ends: 2700 [2021-11-20 22:49:22,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:49:22,637 INFO L933 BasicCegarLoop]: 515 mSDtfsCounter, 7 mSDsluCounter, 1615 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:22,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 2027 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:22,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2700 states. [2021-11-20 22:49:22,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2700 to 2676. [2021-11-20 22:49:22,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2676 states, 1912 states have (on average 1.61663179916318) internal successors, (3091), 2015 states have internal predecessors, (3091), 608 states have call successors, (608), 121 states have call predecessors, (608), 155 states have return successors, (673), 584 states have call predecessors, (673), 603 states have call successors, (673) [2021-11-20 22:49:22,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2676 states to 2676 states and 4372 transitions. [2021-11-20 22:49:22,854 INFO L78 Accepts]: Start accepts. Automaton has 2676 states and 4372 transitions. Word has length 66 [2021-11-20 22:49:22,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:22,855 INFO L470 AbstractCegarLoop]: Abstraction has 2676 states and 4372 transitions. [2021-11-20 22:49:22,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-20 22:49:22,855 INFO L276 IsEmpty]: Start isEmpty. Operand 2676 states and 4372 transitions. [2021-11-20 22:49:22,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 22:49:22,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:22,858 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 22:49:22,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 22:49:22,859 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:22,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:22,860 INFO L85 PathProgramCache]: Analyzing trace with hash -479115929, now seen corresponding path program 1 times [2021-11-20 22:49:22,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:22,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305014727] [2021-11-20 22:49:22,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:22,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:22,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:23,073 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 22:49:23,073 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:23,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305014727] [2021-11-20 22:49:23,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305014727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:23,074 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:23,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 22:49:23,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358422930] [2021-11-20 22:49:23,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:23,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 22:49:23,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:23,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 22:49:23,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-20 22:49:23,078 INFO L87 Difference]: Start difference. First operand 2676 states and 4372 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 7 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-20 22:49:25,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:25,289 INFO L93 Difference]: Finished difference Result 6610 states and 10814 transitions. [2021-11-20 22:49:25,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 22:49:25,290 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 7 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) Word has length 70 [2021-11-20 22:49:25,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:25,328 INFO L225 Difference]: With dead ends: 6610 [2021-11-20 22:49:25,328 INFO L226 Difference]: Without dead ends: 4404 [2021-11-20 22:49:25,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-20 22:49:25,348 INFO L933 BasicCegarLoop]: 767 mSDtfsCounter, 2410 mSDsluCounter, 630 mSDsCounter, 0 mSdLazyCounter, 1752 mSolverCounterSat, 1073 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2547 SdHoareTripleChecker+Valid, 1353 SdHoareTripleChecker+Invalid, 2825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1073 IncrementalHoareTripleChecker+Valid, 1752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:25,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2547 Valid, 1353 Invalid, 2825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1073 Valid, 1752 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 22:49:25,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4404 states. [2021-11-20 22:49:25,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4404 to 4296. [2021-11-20 22:49:25,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4296 states, 3003 states have (on average 1.57009657009657) internal successors, (4715), 3184 states have internal predecessors, (4715), 1017 states have call successors, (1017), 215 states have call predecessors, (1017), 275 states have return successors, (1153), 974 states have call predecessors, (1153), 1012 states have call successors, (1153) [2021-11-20 22:49:25,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4296 states to 4296 states and 6885 transitions. [2021-11-20 22:49:25,699 INFO L78 Accepts]: Start accepts. Automaton has 4296 states and 6885 transitions. Word has length 70 [2021-11-20 22:49:25,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:25,701 INFO L470 AbstractCegarLoop]: Abstraction has 4296 states and 6885 transitions. [2021-11-20 22:49:25,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 7 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-20 22:49:25,701 INFO L276 IsEmpty]: Start isEmpty. Operand 4296 states and 6885 transitions. [2021-11-20 22:49:25,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-20 22:49:25,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:25,705 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 22:49:25,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 22:49:25,706 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:25,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:25,706 INFO L85 PathProgramCache]: Analyzing trace with hash 1594738064, now seen corresponding path program 1 times [2021-11-20 22:49:25,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:25,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771898713] [2021-11-20 22:49:25,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:25,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:25,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:25,891 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 22:49:25,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:25,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771898713] [2021-11-20 22:49:25,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771898713] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:25,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:25,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-20 22:49:25,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608826294] [2021-11-20 22:49:25,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:25,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 22:49:25,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:25,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 22:49:25,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-20 22:49:25,895 INFO L87 Difference]: Start difference. First operand 4296 states and 6885 transitions. Second operand has 11 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 7 states have call successors, (13), 3 states have call predecessors, (13), 5 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) [2021-11-20 22:49:29,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:29,774 INFO L93 Difference]: Finished difference Result 8821 states and 14379 transitions. [2021-11-20 22:49:29,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 22:49:29,775 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 7 states have call successors, (13), 3 states have call predecessors, (13), 5 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) Word has length 73 [2021-11-20 22:49:29,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:29,813 INFO L225 Difference]: With dead ends: 8821 [2021-11-20 22:49:29,813 INFO L226 Difference]: Without dead ends: 4455 [2021-11-20 22:49:29,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 22:49:29,844 INFO L933 BasicCegarLoop]: 785 mSDtfsCounter, 1891 mSDsluCounter, 2702 mSDsCounter, 0 mSdLazyCounter, 5168 mSolverCounterSat, 1080 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1909 SdHoareTripleChecker+Valid, 3307 SdHoareTripleChecker+Invalid, 6248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1080 IncrementalHoareTripleChecker+Valid, 5168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:29,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1909 Valid, 3307 Invalid, 6248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1080 Valid, 5168 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-20 22:49:29,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4455 states. [2021-11-20 22:49:30,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4455 to 4317. [2021-11-20 22:49:30,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4317 states, 3014 states have (on average 1.528533510285335) internal successors, (4607), 3195 states have internal predecessors, (4607), 1019 states have call successors, (1019), 223 states have call predecessors, (1019), 283 states have return successors, (1155), 975 states have call predecessors, (1155), 1014 states have call successors, (1155) [2021-11-20 22:49:30,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4317 states to 4317 states and 6781 transitions. [2021-11-20 22:49:30,237 INFO L78 Accepts]: Start accepts. Automaton has 4317 states and 6781 transitions. Word has length 73 [2021-11-20 22:49:30,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:30,238 INFO L470 AbstractCegarLoop]: Abstraction has 4317 states and 6781 transitions. [2021-11-20 22:49:30,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 7 states have call successors, (13), 3 states have call predecessors, (13), 5 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) [2021-11-20 22:49:30,239 INFO L276 IsEmpty]: Start isEmpty. Operand 4317 states and 6781 transitions. [2021-11-20 22:49:30,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-20 22:49:30,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:30,243 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:30,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 22:49:30,243 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:30,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:30,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1441302672, now seen corresponding path program 1 times [2021-11-20 22:49:30,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:30,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055827420] [2021-11-20 22:49:30,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:30,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:30,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:30,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:49:30,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:30,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055827420] [2021-11-20 22:49:30,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055827420] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:30,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:30,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 22:49:30,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228017232] [2021-11-20 22:49:30,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:30,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 22:49:30,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:30,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 22:49:30,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-20 22:49:30,384 INFO L87 Difference]: Start difference. First operand 4317 states and 6781 transitions. Second operand has 7 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-20 22:49:32,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:32,227 INFO L93 Difference]: Finished difference Result 8482 states and 13353 transitions. [2021-11-20 22:49:32,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 22:49:32,227 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) Word has length 75 [2021-11-20 22:49:32,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:32,265 INFO L225 Difference]: With dead ends: 8482 [2021-11-20 22:49:32,266 INFO L226 Difference]: Without dead ends: 4749 [2021-11-20 22:49:32,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-20 22:49:32,286 INFO L933 BasicCegarLoop]: 542 mSDtfsCounter, 879 mSDsluCounter, 1188 mSDsCounter, 0 mSdLazyCounter, 2028 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 943 SdHoareTripleChecker+Valid, 1638 SdHoareTripleChecker+Invalid, 2408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 2028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:32,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [943 Valid, 1638 Invalid, 2408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 2028 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 22:49:32,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4749 states. [2021-11-20 22:49:32,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4749 to 4407. [2021-11-20 22:49:32,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4407 states, 3074 states have (on average 1.5227716330513987) internal successors, (4681), 3269 states have internal predecessors, (4681), 1021 states have call successors, (1021), 239 states have call predecessors, (1021), 311 states have return successors, (1193), 975 states have call predecessors, (1193), 1016 states have call successors, (1193) [2021-11-20 22:49:32,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4407 states to 4407 states and 6895 transitions. [2021-11-20 22:49:32,586 INFO L78 Accepts]: Start accepts. Automaton has 4407 states and 6895 transitions. Word has length 75 [2021-11-20 22:49:32,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:32,587 INFO L470 AbstractCegarLoop]: Abstraction has 4407 states and 6895 transitions. [2021-11-20 22:49:32,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-20 22:49:32,587 INFO L276 IsEmpty]: Start isEmpty. Operand 4407 states and 6895 transitions. [2021-11-20 22:49:32,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 22:49:32,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:32,590 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:32,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 22:49:32,591 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:32,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:32,591 INFO L85 PathProgramCache]: Analyzing trace with hash 391964383, now seen corresponding path program 1 times [2021-11-20 22:49:32,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:32,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268980539] [2021-11-20 22:49:32,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:32,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:32,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:32,726 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:49:32,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:32,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268980539] [2021-11-20 22:49:32,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268980539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:32,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:32,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:32,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798992412] [2021-11-20 22:49:32,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:32,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:32,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:32,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:32,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:32,730 INFO L87 Difference]: Start difference. First operand 4407 states and 6895 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) [2021-11-20 22:49:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:33,173 INFO L93 Difference]: Finished difference Result 11264 states and 17737 transitions. [2021-11-20 22:49:33,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:33,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) Word has length 82 [2021-11-20 22:49:33,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:33,235 INFO L225 Difference]: With dead ends: 11264 [2021-11-20 22:49:33,235 INFO L226 Difference]: Without dead ends: 6873 [2021-11-20 22:49:33,265 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 22:49:33,268 INFO L933 BasicCegarLoop]: 615 mSDtfsCounter, 503 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 503 SdHoareTripleChecker+Valid, 1100 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:33,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [503 Valid, 1100 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:33,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6873 states. [2021-11-20 22:49:33,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6873 to 6784. [2021-11-20 22:49:33,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6784 states, 4747 states have (on average 1.520117969243733) internal successors, (7216), 5061 states have internal predecessors, (7216), 1559 states have call successors, (1559), 361 states have call predecessors, (1559), 477 states have return successors, (1871), 1473 states have call predecessors, (1871), 1554 states have call successors, (1871) [2021-11-20 22:49:33,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6784 states to 6784 states and 10646 transitions. [2021-11-20 22:49:33,744 INFO L78 Accepts]: Start accepts. Automaton has 6784 states and 10646 transitions. Word has length 82 [2021-11-20 22:49:33,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:33,745 INFO L470 AbstractCegarLoop]: Abstraction has 6784 states and 10646 transitions. [2021-11-20 22:49:33,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) [2021-11-20 22:49:33,745 INFO L276 IsEmpty]: Start isEmpty. Operand 6784 states and 10646 transitions. [2021-11-20 22:49:33,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-20 22:49:33,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:33,748 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:33,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 22:49:33,749 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:33,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:33,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1788160620, now seen corresponding path program 1 times [2021-11-20 22:49:33,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:33,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267907652] [2021-11-20 22:49:33,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:33,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:33,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:33,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 22:49:33,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:33,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267907652] [2021-11-20 22:49:33,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267907652] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:33,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:33,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:33,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808893552] [2021-11-20 22:49:33,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:33,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:33,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:33,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:33,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:33,847 INFO L87 Difference]: Start difference. First operand 6784 states and 10646 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:34,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:34,575 INFO L93 Difference]: Finished difference Result 18396 states and 29113 transitions. [2021-11-20 22:49:34,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:34,576 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) Word has length 80 [2021-11-20 22:49:34,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:34,653 INFO L225 Difference]: With dead ends: 18396 [2021-11-20 22:49:34,653 INFO L226 Difference]: Without dead ends: 11629 [2021-11-20 22:49:34,683 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 22:49:34,683 INFO L933 BasicCegarLoop]: 618 mSDtfsCounter, 502 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 502 SdHoareTripleChecker+Valid, 1106 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:34,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [502 Valid, 1106 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:34,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11629 states. [2021-11-20 22:49:35,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11629 to 11539. [2021-11-20 22:49:35,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11539 states, 8094 states have (on average 1.5174203113417346) internal successors, (12282), 8646 states have internal predecessors, (12282), 2635 states have call successors, (2635), 605 states have call predecessors, (2635), 809 states have return successors, (3285), 2469 states have call predecessors, (3285), 2630 states have call successors, (3285) [2021-11-20 22:49:35,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11539 states to 11539 states and 18202 transitions. [2021-11-20 22:49:35,502 INFO L78 Accepts]: Start accepts. Automaton has 11539 states and 18202 transitions. Word has length 80 [2021-11-20 22:49:35,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:35,504 INFO L470 AbstractCegarLoop]: Abstraction has 11539 states and 18202 transitions. [2021-11-20 22:49:35,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:35,504 INFO L276 IsEmpty]: Start isEmpty. Operand 11539 states and 18202 transitions. [2021-11-20 22:49:35,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-20 22:49:35,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:35,509 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:35,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 22:49:35,509 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:35,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:35,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1283360255, now seen corresponding path program 1 times [2021-11-20 22:49:35,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:35,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460032969] [2021-11-20 22:49:35,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:35,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:35,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:35,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:49:35,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:35,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460032969] [2021-11-20 22:49:35,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460032969] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:35,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:35,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:35,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720898458] [2021-11-20 22:49:35,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:35,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:35,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:35,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:35,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:35,620 INFO L87 Difference]: Start difference. First operand 11539 states and 18202 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) [2021-11-20 22:49:36,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:36,735 INFO L93 Difference]: Finished difference Result 32661 states and 52194 transitions. [2021-11-20 22:49:36,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:36,736 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) Word has length 84 [2021-11-20 22:49:36,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:36,899 INFO L225 Difference]: With dead ends: 32661 [2021-11-20 22:49:36,900 INFO L226 Difference]: Without dead ends: 21141 [2021-11-20 22:49:36,953 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 22:49:36,954 INFO L933 BasicCegarLoop]: 621 mSDtfsCounter, 501 mSDsluCounter, 521 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 1112 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:36,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [501 Valid, 1112 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:36,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21141 states. [2021-11-20 22:49:38,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21141 to 21050. [2021-11-20 22:49:38,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21050 states, 14789 states have (on average 1.514098316316181) internal successors, (22392), 15817 states have internal predecessors, (22392), 4787 states have call successors, (4787), 1093 states have call predecessors, (4787), 1473 states have return successors, (6359), 4461 states have call predecessors, (6359), 4782 states have call successors, (6359) [2021-11-20 22:49:38,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21050 states to 21050 states and 33538 transitions. [2021-11-20 22:49:38,436 INFO L78 Accepts]: Start accepts. Automaton has 21050 states and 33538 transitions. Word has length 84 [2021-11-20 22:49:38,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:38,437 INFO L470 AbstractCegarLoop]: Abstraction has 21050 states and 33538 transitions. [2021-11-20 22:49:38,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 2 states have call predecessors, (15), 1 states have call successors, (15) [2021-11-20 22:49:38,437 INFO L276 IsEmpty]: Start isEmpty. Operand 21050 states and 33538 transitions. [2021-11-20 22:49:38,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 22:49:38,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:38,440 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:38,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-20 22:49:38,441 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:38,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:38,442 INFO L85 PathProgramCache]: Analyzing trace with hash 431552142, now seen corresponding path program 1 times [2021-11-20 22:49:38,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:38,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212844036] [2021-11-20 22:49:38,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:38,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:38,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:38,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 22:49:38,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:38,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212844036] [2021-11-20 22:49:38,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212844036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:38,549 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:38,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:38,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917581363] [2021-11-20 22:49:38,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:38,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:38,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:38,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:38,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:38,551 INFO L87 Difference]: Start difference. First operand 21050 states and 33538 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:40,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:40,790 INFO L93 Difference]: Finished difference Result 61192 states and 99535 transitions. [2021-11-20 22:49:40,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:40,791 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) Word has length 82 [2021-11-20 22:49:40,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:41,058 INFO L225 Difference]: With dead ends: 61192 [2021-11-20 22:49:41,058 INFO L226 Difference]: Without dead ends: 40165 [2021-11-20 22:49:41,148 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 22:49:41,149 INFO L933 BasicCegarLoop]: 624 mSDtfsCounter, 500 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 500 SdHoareTripleChecker+Valid, 1118 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:41,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [500 Valid, 1118 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:41,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40165 states. [2021-11-20 22:49:43,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40165 to 40073. [2021-11-20 22:49:43,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40073 states, 28180 states have (on average 1.5100780695528744) internal successors, (42554), 30160 states have internal predecessors, (42554), 9091 states have call successors, (9091), 2069 states have call predecessors, (9091), 2801 states have return successors, (13365), 8445 states have call predecessors, (13365), 9086 states have call successors, (13365) [2021-11-20 22:49:44,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40073 states to 40073 states and 65010 transitions. [2021-11-20 22:49:44,065 INFO L78 Accepts]: Start accepts. Automaton has 40073 states and 65010 transitions. Word has length 82 [2021-11-20 22:49:44,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:44,066 INFO L470 AbstractCegarLoop]: Abstraction has 40073 states and 65010 transitions. [2021-11-20 22:49:44,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:44,067 INFO L276 IsEmpty]: Start isEmpty. Operand 40073 states and 65010 transitions. [2021-11-20 22:49:44,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-20 22:49:44,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:44,070 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:44,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 22:49:44,070 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:44,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:44,071 INFO L85 PathProgramCache]: Analyzing trace with hash 493100789, now seen corresponding path program 1 times [2021-11-20 22:49:44,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:44,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193620724] [2021-11-20 22:49:44,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:44,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:44,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:44,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 22:49:44,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:44,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193620724] [2021-11-20 22:49:44,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193620724] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:44,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:44,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:44,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649554999] [2021-11-20 22:49:44,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:44,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:44,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:44,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:44,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:44,165 INFO L87 Difference]: Start difference. First operand 40073 states and 65010 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:46,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:46,300 INFO L93 Difference]: Finished difference Result 42544 states and 69312 transitions. [2021-11-20 22:49:46,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:46,301 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) Word has length 83 [2021-11-20 22:49:46,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:46,548 INFO L225 Difference]: With dead ends: 42544 [2021-11-20 22:49:46,549 INFO L226 Difference]: Without dead ends: 42533 [2021-11-20 22:49:46,572 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 22:49:46,573 INFO L933 BasicCegarLoop]: 617 mSDtfsCounter, 486 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 1116 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:46,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [486 Valid, 1116 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:46,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42533 states. [2021-11-20 22:49:48,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42533 to 42446. [2021-11-20 22:49:49,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42446 states, 29850 states have (on average 1.5080067001675042) internal successors, (45014), 31949 states have internal predecessors, (45014), 9629 states have call successors, (9629), 2191 states have call predecessors, (9629), 2966 states have return successors, (14500), 8942 states have call predecessors, (14500), 9624 states have call successors, (14500) [2021-11-20 22:49:49,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42446 states to 42446 states and 69143 transitions. [2021-11-20 22:49:49,255 INFO L78 Accepts]: Start accepts. Automaton has 42446 states and 69143 transitions. Word has length 83 [2021-11-20 22:49:49,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:49,255 INFO L470 AbstractCegarLoop]: Abstraction has 42446 states and 69143 transitions. [2021-11-20 22:49:49,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 2 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 22:49:49,256 INFO L276 IsEmpty]: Start isEmpty. Operand 42446 states and 69143 transitions. [2021-11-20 22:49:49,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-20 22:49:49,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:49,267 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:49,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 22:49:49,268 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:49,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:49,268 INFO L85 PathProgramCache]: Analyzing trace with hash 157669238, now seen corresponding path program 1 times [2021-11-20 22:49:49,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:49,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682062341] [2021-11-20 22:49:49,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:49,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:49,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:49,440 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-20 22:49:49,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:49,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682062341] [2021-11-20 22:49:49,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682062341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:49,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178247] [2021-11-20 22:49:49,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:49,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:49,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:49,446 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:49,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:49:49,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:49,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 2040 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:49:49,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:50,160 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-20 22:49:50,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:49:50,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178247] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:50,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:49:50,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2021-11-20 22:49:50,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767859619] [2021-11-20 22:49:50,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:50,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:49:50,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:50,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:49:50,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-20 22:49:50,163 INFO L87 Difference]: Start difference. First operand 42446 states and 69143 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:49:53,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:53,082 INFO L93 Difference]: Finished difference Result 86981 states and 145831 transitions. [2021-11-20 22:49:53,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:49:53,082 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 134 [2021-11-20 22:49:53,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:53,453 INFO L225 Difference]: With dead ends: 86981 [2021-11-20 22:49:53,453 INFO L226 Difference]: Without dead ends: 44552 [2021-11-20 22:49:53,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-20 22:49:53,723 INFO L933 BasicCegarLoop]: 437 mSDtfsCounter, 213 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1287 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:53,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1287 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:49:53,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44552 states. [2021-11-20 22:49:56,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44552 to 44552. [2021-11-20 22:49:56,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44552 states, 31902 states have (on average 1.5345746348191336) internal successors, (48956), 34001 states have internal predecessors, (48956), 9629 states have call successors, (9629), 2245 states have call predecessors, (9629), 3020 states have return successors, (14500), 8942 states have call predecessors, (14500), 9624 states have call successors, (14500) [2021-11-20 22:49:56,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44552 states to 44552 states and 73085 transitions. [2021-11-20 22:49:56,487 INFO L78 Accepts]: Start accepts. Automaton has 44552 states and 73085 transitions. Word has length 134 [2021-11-20 22:49:56,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:56,488 INFO L470 AbstractCegarLoop]: Abstraction has 44552 states and 73085 transitions. [2021-11-20 22:49:56,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:49:56,488 INFO L276 IsEmpty]: Start isEmpty. Operand 44552 states and 73085 transitions. [2021-11-20 22:49:56,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-20 22:49:56,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:56,502 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:56,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:56,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 22:49:56,710 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:56,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:56,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1443743672, now seen corresponding path program 1 times [2021-11-20 22:49:56,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:56,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981282167] [2021-11-20 22:49:56,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:56,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:56,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:56,826 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-20 22:49:56,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:56,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981282167] [2021-11-20 22:49:56,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981282167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:56,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274722278] [2021-11-20 22:49:56,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:56,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:56,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:56,829 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:56,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:49:57,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:57,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 2045 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:49:57,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-20 22:49:57,462 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:49:57,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274722278] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:57,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:49:57,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-20 22:49:57,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440277828] [2021-11-20 22:49:57,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:57,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:49:57,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:57,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:49:57,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:49:57,464 INFO L87 Difference]: Start difference. First operand 44552 states and 73085 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:49:59,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:59,989 INFO L93 Difference]: Finished difference Result 91193 states and 153470 transitions. [2021-11-20 22:49:59,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:49:59,990 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 139 [2021-11-20 22:49:59,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:00,266 INFO L225 Difference]: With dead ends: 91193 [2021-11-20 22:50:00,266 INFO L226 Difference]: Without dead ends: 46658 [2021-11-20 22:50:00,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 22:50:00,481 INFO L933 BasicCegarLoop]: 437 mSDtfsCounter, 211 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1287 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:00,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1287 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:50:00,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46658 states. [2021-11-20 22:50:02,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46658 to 46658. [2021-11-20 22:50:02,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46658 states, 33954 states have (on average 1.5579313188431407) internal successors, (52898), 36053 states have internal predecessors, (52898), 9629 states have call successors, (9629), 2299 states have call predecessors, (9629), 3074 states have return successors, (14500), 8942 states have call predecessors, (14500), 9624 states have call successors, (14500) [2021-11-20 22:50:03,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46658 states to 46658 states and 77027 transitions. [2021-11-20 22:50:03,121 INFO L78 Accepts]: Start accepts. Automaton has 46658 states and 77027 transitions. Word has length 139 [2021-11-20 22:50:03,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:03,121 INFO L470 AbstractCegarLoop]: Abstraction has 46658 states and 77027 transitions. [2021-11-20 22:50:03,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:03,122 INFO L276 IsEmpty]: Start isEmpty. Operand 46658 states and 77027 transitions. [2021-11-20 22:50:03,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 22:50:03,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:03,138 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:03,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:03,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:03,353 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:03,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:03,354 INFO L85 PathProgramCache]: Analyzing trace with hash 1779382168, now seen corresponding path program 1 times [2021-11-20 22:50:03,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:03,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933858681] [2021-11-20 22:50:03,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:03,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:03,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:03,524 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-20 22:50:03,524 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:03,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933858681] [2021-11-20 22:50:03,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933858681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:03,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042568672] [2021-11-20 22:50:03,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:03,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:03,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:03,526 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:03,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:50:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:03,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 2049 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:50:03,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:04,214 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 22:50:04,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:04,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042568672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:04,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:04,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-20 22:50:04,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007084895] [2021-11-20 22:50:04,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:04,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:50:04,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:04,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:50:04,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:50:04,216 INFO L87 Difference]: Start difference. First operand 46658 states and 77027 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:06,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:06,686 INFO L93 Difference]: Finished difference Result 95405 states and 161109 transitions. [2021-11-20 22:50:06,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:50:06,686 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 143 [2021-11-20 22:50:06,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:06,941 INFO L225 Difference]: With dead ends: 95405 [2021-11-20 22:50:06,941 INFO L226 Difference]: Without dead ends: 48764 [2021-11-20 22:50:07,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 22:50:07,149 INFO L933 BasicCegarLoop]: 437 mSDtfsCounter, 209 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1287 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:07,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1287 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:50:07,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48764 states. [2021-11-20 22:50:09,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48764 to 48764. [2021-11-20 22:50:09,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48764 states, 36006 states have (on average 1.578625784591457) internal successors, (56840), 38105 states have internal predecessors, (56840), 9629 states have call successors, (9629), 2353 states have call predecessors, (9629), 3128 states have return successors, (14500), 8942 states have call predecessors, (14500), 9624 states have call successors, (14500) [2021-11-20 22:50:09,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48764 states to 48764 states and 80969 transitions. [2021-11-20 22:50:09,938 INFO L78 Accepts]: Start accepts. Automaton has 48764 states and 80969 transitions. Word has length 143 [2021-11-20 22:50:09,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:09,941 INFO L470 AbstractCegarLoop]: Abstraction has 48764 states and 80969 transitions. [2021-11-20 22:50:09,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:09,942 INFO L276 IsEmpty]: Start isEmpty. Operand 48764 states and 80969 transitions. [2021-11-20 22:50:09,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-20 22:50:09,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:09,953 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:09,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 22:50:10,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 22:50:10,181 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:10,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:10,182 INFO L85 PathProgramCache]: Analyzing trace with hash 1284635354, now seen corresponding path program 1 times [2021-11-20 22:50:10,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:10,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612546464] [2021-11-20 22:50:10,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:10,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:10,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:10,633 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 22:50:10,633 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:10,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612546464] [2021-11-20 22:50:10,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612546464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:10,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263965413] [2021-11-20 22:50:10,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:10,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:10,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:10,635 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:10,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:50:11,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:11,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 2052 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:50:11,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:11,347 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-20 22:50:11,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:11,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263965413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:11,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:11,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [22] total 24 [2021-11-20 22:50:11,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387301852] [2021-11-20 22:50:11,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:11,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:50:11,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:11,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:50:11,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-11-20 22:50:11,350 INFO L87 Difference]: Start difference. First operand 48764 states and 80969 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:13,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:13,504 INFO L93 Difference]: Finished difference Result 99617 states and 168748 transitions. [2021-11-20 22:50:13,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:50:13,505 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 146 [2021-11-20 22:50:13,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:13,718 INFO L225 Difference]: With dead ends: 99617 [2021-11-20 22:50:13,718 INFO L226 Difference]: Without dead ends: 50870 [2021-11-20 22:50:13,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2021-11-20 22:50:13,855 INFO L933 BasicCegarLoop]: 437 mSDtfsCounter, 207 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1287 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:13,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1287 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:50:13,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50870 states. [2021-11-20 22:50:16,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50870 to 50870. [2021-11-20 22:50:16,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50870 states, 38058 states have (on average 1.597088654159441) internal successors, (60782), 40157 states have internal predecessors, (60782), 9629 states have call successors, (9629), 2407 states have call predecessors, (9629), 3182 states have return successors, (14500), 8942 states have call predecessors, (14500), 9624 states have call successors, (14500) [2021-11-20 22:50:16,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50870 states to 50870 states and 84911 transitions. [2021-11-20 22:50:16,367 INFO L78 Accepts]: Start accepts. Automaton has 50870 states and 84911 transitions. Word has length 146 [2021-11-20 22:50:16,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:16,368 INFO L470 AbstractCegarLoop]: Abstraction has 50870 states and 84911 transitions. [2021-11-20 22:50:16,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:16,369 INFO L276 IsEmpty]: Start isEmpty. Operand 50870 states and 84911 transitions. [2021-11-20 22:50:16,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-20 22:50:16,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:16,379 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:16,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:16,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 22:50:16,589 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:16,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:16,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1184063916, now seen corresponding path program 1 times [2021-11-20 22:50:16,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:16,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027871015] [2021-11-20 22:50:16,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:16,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:16,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:16,981 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-20 22:50:16,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:16,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027871015] [2021-11-20 22:50:16,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027871015] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:16,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610091340] [2021-11-20 22:50:16,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:16,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:16,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:16,983 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:17,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cb4c9e1-7e35-4be5-ad80-4f33baf8ab38/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:50:17,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:17,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 2048 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 22:50:17,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:17,828 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-20 22:50:17,829 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:17,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610091340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:17,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:17,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [22] total 26 [2021-11-20 22:50:17,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957012409] [2021-11-20 22:50:17,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:17,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 22:50:17,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:17,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 22:50:17,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-20 22:50:17,832 INFO L87 Difference]: Start difference. First operand 50870 states and 84911 transitions. Second operand has 6 states, 5 states have (on average 15.6) internal successors, (78), 5 states have internal predecessors, (78), 3 states have call successors, (24), 3 states have call predecessors, (24), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-20 22:50:20,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:20,910 INFO L93 Difference]: Finished difference Result 101824 states and 170176 transitions. [2021-11-20 22:50:20,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 22:50:20,911 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 15.6) internal successors, (78), 5 states have internal predecessors, (78), 3 states have call successors, (24), 3 states have call predecessors, (24), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 148 [2021-11-20 22:50:20,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:21,154 INFO L225 Difference]: With dead ends: 101824 [2021-11-20 22:50:21,154 INFO L226 Difference]: Without dead ends: 50986 [2021-11-20 22:50:21,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2021-11-20 22:50:21,293 INFO L933 BasicCegarLoop]: 574 mSDtfsCounter, 298 mSDsluCounter, 1722 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 2174 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:21,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 2174 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:21,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50986 states.