./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label37.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label37.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur --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 1c0cc6929709cefe19ab2aef19e8ee66797622b8a8e015c421c466573f22c0b0 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 23:24:04,041 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:24:04,044 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:24:04,068 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:24:04,069 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:24:04,070 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:24:04,072 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:24:04,075 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:24:04,077 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:24:04,078 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:24:04,080 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:24:04,082 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:24:04,082 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:24:04,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:24:04,085 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:24:04,087 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:24:04,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:24:04,089 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:24:04,092 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:24:04,094 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:24:04,096 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:24:04,097 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:24:04,099 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:24:04,100 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:24:04,105 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:24:04,106 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:24:04,106 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:24:04,108 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:24:04,108 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:24:04,110 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:24:04,110 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:24:04,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:24:04,113 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:24:04,114 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:24:04,116 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:24:04,117 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:24:04,118 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:24:04,118 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:24:04,119 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:24:04,120 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:24:04,122 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:24:04,123 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:24:04,151 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:24:04,151 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:24:04,152 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:24:04,152 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:24:04,153 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:24:04,153 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:24:04,154 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:24:04,154 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:24:04,154 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:24:04,155 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:24:04,155 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:24:04,156 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:24:04,156 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:24:04,156 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:24:04,157 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:24:04,157 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:24:04,158 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:24:04,158 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:24:04,159 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:24:04,159 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:24:04,160 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:24:04,160 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:24:04,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:24:04,161 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:24:04,161 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:24:04,162 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:24:04,162 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:24:04,162 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:24:04,163 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:24:04,163 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:24:04,163 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:24:04,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:24:04,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:24:04,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:24:04,165 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:24:04,165 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:24:04,166 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:24:04,166 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:24:04,166 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:24:04,167 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:24:04,167 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:24:04,167 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1c0cc6929709cefe19ab2aef19e8ee66797622b8a8e015c421c466573f22c0b0 [2022-11-25 23:24:04,508 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:24:04,542 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:24:04,547 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:24:04,549 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:24:04,550 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:24:04,552 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/eca-rers2012/Problem03_label37.c [2022-11-25 23:24:08,058 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:24:08,570 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:24:08,572 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/sv-benchmarks/c/eca-rers2012/Problem03_label37.c [2022-11-25 23:24:08,595 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/data/88b4e4cce/31223b1a301c4847afe4460df3930c87/FLAG97e29f5f7 [2022-11-25 23:24:08,618 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/data/88b4e4cce/31223b1a301c4847afe4460df3930c87 [2022-11-25 23:24:08,624 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:24:08,627 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:24:08,633 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:24:08,633 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:24:08,638 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:24:08,639 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:24:08" (1/1) ... [2022-11-25 23:24:08,641 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f175cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:08, skipping insertion in model container [2022-11-25 23:24:08,642 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:24:08" (1/1) ... [2022-11-25 23:24:08,652 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:24:08,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:24:09,519 WARN L237 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_e4713301-6484-4735-827e-0b6a092a3dc0/sv-benchmarks/c/eca-rers2012/Problem03_label37.c[54326,54339] [2022-11-25 23:24:09,604 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:24:09,619 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:24:10,068 WARN L237 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_e4713301-6484-4735-827e-0b6a092a3dc0/sv-benchmarks/c/eca-rers2012/Problem03_label37.c[54326,54339] [2022-11-25 23:24:10,092 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:24:10,118 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:24:10,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10 WrapperNode [2022-11-25 23:24:10,119 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:24:10,121 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:24:10,121 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:24:10,122 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:24:10,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,185 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,327 INFO L138 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2022-11-25 23:24:10,328 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:24:10,329 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:24:10,329 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:24:10,329 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:24:10,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,343 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,355 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,356 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,429 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,441 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,458 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,470 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:24:10,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:24:10,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:24:10,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:24:10,489 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (1/1) ... [2022-11-25 23:24:10,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:24:10,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:10,527 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:24:10,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:24:10,592 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:24:10,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:24:10,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:24:10,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:24:10,744 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:24:10,747 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:24:13,232 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:24:13,652 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:24:13,652 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-25 23:24:13,655 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:24:13 BoogieIcfgContainer [2022-11-25 23:24:13,656 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:24:13,658 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:24:13,659 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:24:13,662 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:24:13,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:24:08" (1/3) ... [2022-11-25 23:24:13,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e8d5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:24:13, skipping insertion in model container [2022-11-25 23:24:13,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:24:10" (2/3) ... [2022-11-25 23:24:13,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e8d5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:24:13, skipping insertion in model container [2022-11-25 23:24:13,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:24:13" (3/3) ... [2022-11-25 23:24:13,666 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label37.c [2022-11-25 23:24:13,689 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:24:13,690 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:24:13,769 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:24:13,778 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@aea4171, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:24:13,779 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:24:13,786 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:13,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-25 23:24:13,800 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:13,801 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:13,801 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:13,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:13,807 INFO L85 PathProgramCache]: Analyzing trace with hash 209338295, now seen corresponding path program 1 times [2022-11-25 23:24:13,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:13,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71799441] [2022-11-25 23:24:13,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:13,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:14,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:14,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:14,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:14,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71799441] [2022-11-25 23:24:14,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71799441] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:14,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:14,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:14,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534896886] [2022-11-25 23:24:14,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:14,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:14,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:14,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:14,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:14,946 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:16,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:16,159 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2022-11-25 23:24:16,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:16,169 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2022-11-25 23:24:16,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:16,188 INFO L225 Difference]: With dead ends: 440 [2022-11-25 23:24:16,192 INFO L226 Difference]: Without dead ends: 289 [2022-11-25 23:24:16,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:16,204 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:16,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 57 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:24:16,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2022-11-25 23:24:16,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2022-11-25 23:24:16,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.9270833333333333) internal successors, (555), 288 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:16,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 555 transitions. [2022-11-25 23:24:16,313 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 555 transitions. Word has length 143 [2022-11-25 23:24:16,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:16,317 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 555 transitions. [2022-11-25 23:24:16,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:16,318 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 555 transitions. [2022-11-25 23:24:16,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-25 23:24:16,333 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:16,334 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:16,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:24:16,335 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:16,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:16,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1305703211, now seen corresponding path program 1 times [2022-11-25 23:24:16,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:16,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279057748] [2022-11-25 23:24:16,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:16,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:16,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:16,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:16,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279057748] [2022-11-25 23:24:16,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279057748] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:16,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:16,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:16,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029328046] [2022-11-25 23:24:16,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:16,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:16,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:16,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:16,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:16,944 INFO L87 Difference]: Start difference. First operand 289 states and 555 transitions. Second operand has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:17,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:17,941 INFO L93 Difference]: Finished difference Result 865 states and 1663 transitions. [2022-11-25 23:24:17,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:17,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2022-11-25 23:24:17,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:17,946 INFO L225 Difference]: With dead ends: 865 [2022-11-25 23:24:17,946 INFO L226 Difference]: Without dead ends: 577 [2022-11-25 23:24:17,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:17,949 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 180 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:17,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 16 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:24:17,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2022-11-25 23:24:17,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 575. [2022-11-25 23:24:17,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.8954703832752613) internal successors, (1088), 574 states have internal predecessors, (1088), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:17,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1088 transitions. [2022-11-25 23:24:17,992 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1088 transitions. Word has length 147 [2022-11-25 23:24:17,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:17,993 INFO L495 AbstractCegarLoop]: Abstraction has 575 states and 1088 transitions. [2022-11-25 23:24:17,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:17,994 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1088 transitions. [2022-11-25 23:24:17,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2022-11-25 23:24:17,996 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:17,997 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:17,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:24:17,997 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:17,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:17,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1322614177, now seen corresponding path program 1 times [2022-11-25 23:24:17,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:17,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553770076] [2022-11-25 23:24:17,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:17,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:18,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:18,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:18,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:18,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553770076] [2022-11-25 23:24:18,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553770076] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:18,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:18,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:18,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421122336] [2022-11-25 23:24:18,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:18,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:18,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:18,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:18,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:18,373 INFO L87 Difference]: Start difference. First operand 575 states and 1088 transitions. Second operand has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:19,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:19,571 INFO L93 Difference]: Finished difference Result 1721 states and 3261 transitions. [2022-11-25 23:24:19,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:19,572 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2022-11-25 23:24:19,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:19,578 INFO L225 Difference]: With dead ends: 1721 [2022-11-25 23:24:19,578 INFO L226 Difference]: Without dead ends: 1147 [2022-11-25 23:24:19,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:19,591 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 164 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:19,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 58 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:24:19,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2022-11-25 23:24:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 861. [2022-11-25 23:24:19,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.7906976744186047) internal successors, (1540), 860 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:19,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1540 transitions. [2022-11-25 23:24:19,674 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1540 transitions. Word has length 148 [2022-11-25 23:24:19,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:19,675 INFO L495 AbstractCegarLoop]: Abstraction has 861 states and 1540 transitions. [2022-11-25 23:24:19,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:19,675 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1540 transitions. [2022-11-25 23:24:19,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-11-25 23:24:19,678 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:19,678 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:19,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-25 23:24:19,679 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:19,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:19,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1094378582, now seen corresponding path program 1 times [2022-11-25 23:24:19,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:19,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179054158] [2022-11-25 23:24:19,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:19,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:19,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:19,908 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:19,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:19,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179054158] [2022-11-25 23:24:19,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179054158] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:19,911 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:19,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:19,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769968731] [2022-11-25 23:24:19,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:19,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:19,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:19,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:19,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:19,916 INFO L87 Difference]: Start difference. First operand 861 states and 1540 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:21,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:21,048 INFO L93 Difference]: Finished difference Result 2579 states and 4617 transitions. [2022-11-25 23:24:21,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:21,052 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2022-11-25 23:24:21,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:21,062 INFO L225 Difference]: With dead ends: 2579 [2022-11-25 23:24:21,062 INFO L226 Difference]: Without dead ends: 1719 [2022-11-25 23:24:21,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:21,074 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:21,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 25 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:24:21,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2022-11-25 23:24:21,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2022-11-25 23:24:21,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.7473806752037253) internal successors, (3002), 1718 states have internal predecessors, (3002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:21,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 3002 transitions. [2022-11-25 23:24:21,148 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 3002 transitions. Word has length 151 [2022-11-25 23:24:21,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:21,148 INFO L495 AbstractCegarLoop]: Abstraction has 1719 states and 3002 transitions. [2022-11-25 23:24:21,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:21,149 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 3002 transitions. [2022-11-25 23:24:21,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2022-11-25 23:24:21,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:21,157 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:21,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-25 23:24:21,158 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:21,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:21,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1051108867, now seen corresponding path program 1 times [2022-11-25 23:24:21,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:21,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160074162] [2022-11-25 23:24:21,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:21,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:21,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:21,458 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:24:21,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:21,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160074162] [2022-11-25 23:24:21,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160074162] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:21,459 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:21,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:24:21,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645874098] [2022-11-25 23:24:21,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:21,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:21,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:21,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:21,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:21,465 INFO L87 Difference]: Start difference. First operand 1719 states and 3002 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:22,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:22,617 INFO L93 Difference]: Finished difference Result 5153 states and 9003 transitions. [2022-11-25 23:24:22,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:22,619 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2022-11-25 23:24:22,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:22,636 INFO L225 Difference]: With dead ends: 5153 [2022-11-25 23:24:22,636 INFO L226 Difference]: Without dead ends: 3435 [2022-11-25 23:24:22,639 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:24:22,640 INFO L413 NwaCegarLoop]: 258 mSDtfsCounter, 151 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:22,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 262 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:24:22,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2022-11-25 23:24:22,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3006. [2022-11-25 23:24:22,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3006 states, 3005 states have (on average 1.5234608985024958) internal successors, (4578), 3005 states have internal predecessors, (4578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:22,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3006 states to 3006 states and 4578 transitions. [2022-11-25 23:24:22,739 INFO L78 Accepts]: Start accepts. Automaton has 3006 states and 4578 transitions. Word has length 163 [2022-11-25 23:24:22,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:22,740 INFO L495 AbstractCegarLoop]: Abstraction has 3006 states and 4578 transitions. [2022-11-25 23:24:22,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:22,741 INFO L276 IsEmpty]: Start isEmpty. Operand 3006 states and 4578 transitions. [2022-11-25 23:24:22,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-11-25 23:24:22,748 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:22,748 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:22,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-25 23:24:22,749 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:22,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:22,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1982509172, now seen corresponding path program 1 times [2022-11-25 23:24:22,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:22,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950443398] [2022-11-25 23:24:22,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:22,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:22,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:23,037 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:23,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:23,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950443398] [2022-11-25 23:24:23,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950443398] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:23,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:23,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:23,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86835697] [2022-11-25 23:24:23,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:23,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:23,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:23,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:23,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:23,041 INFO L87 Difference]: Start difference. First operand 3006 states and 4578 transitions. Second operand has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:24,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:24,215 INFO L93 Difference]: Finished difference Result 9014 states and 13731 transitions. [2022-11-25 23:24:24,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:24,216 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2022-11-25 23:24:24,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:24,241 INFO L225 Difference]: With dead ends: 9014 [2022-11-25 23:24:24,242 INFO L226 Difference]: Without dead ends: 6009 [2022-11-25 23:24:24,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:24,248 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:24,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 68 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:24:24,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6009 states. [2022-11-25 23:24:24,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6009 to 5866. [2022-11-25 23:24:24,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5866 states, 5865 states have (on average 1.4508098891730605) internal successors, (8509), 5865 states have internal predecessors, (8509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:24,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5866 states to 5866 states and 8509 transitions. [2022-11-25 23:24:24,437 INFO L78 Accepts]: Start accepts. Automaton has 5866 states and 8509 transitions. Word has length 166 [2022-11-25 23:24:24,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:24,438 INFO L495 AbstractCegarLoop]: Abstraction has 5866 states and 8509 transitions. [2022-11-25 23:24:24,438 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:24,438 INFO L276 IsEmpty]: Start isEmpty. Operand 5866 states and 8509 transitions. [2022-11-25 23:24:24,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-11-25 23:24:24,449 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:24,449 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:24,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-25 23:24:24,450 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:24,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:24,450 INFO L85 PathProgramCache]: Analyzing trace with hash 610397468, now seen corresponding path program 1 times [2022-11-25 23:24:24,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:24,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973868882] [2022-11-25 23:24:24,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:24,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:24,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:24,750 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-25 23:24:24,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:24,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973868882] [2022-11-25 23:24:24,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973868882] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:24,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:24,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:24,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743654374] [2022-11-25 23:24:24,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:24,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:24,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:24,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:24,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:24,755 INFO L87 Difference]: Start difference. First operand 5866 states and 8509 transitions. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:25,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:25,444 INFO L93 Difference]: Finished difference Result 11731 states and 17017 transitions. [2022-11-25 23:24:25,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:25,445 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2022-11-25 23:24:25,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:25,473 INFO L225 Difference]: With dead ends: 11731 [2022-11-25 23:24:25,473 INFO L226 Difference]: Without dead ends: 5866 [2022-11-25 23:24:25,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:25,482 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 240 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:25,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [240 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:24:25,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5866 states. [2022-11-25 23:24:25,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5866 to 5437. [2022-11-25 23:24:25,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5437 states, 5436 states have (on average 1.4245768947755704) internal successors, (7744), 5436 states have internal predecessors, (7744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:25,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5437 states to 5437 states and 7744 transitions. [2022-11-25 23:24:25,670 INFO L78 Accepts]: Start accepts. Automaton has 5437 states and 7744 transitions. Word has length 176 [2022-11-25 23:24:25,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:25,671 INFO L495 AbstractCegarLoop]: Abstraction has 5437 states and 7744 transitions. [2022-11-25 23:24:25,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:25,671 INFO L276 IsEmpty]: Start isEmpty. Operand 5437 states and 7744 transitions. [2022-11-25 23:24:25,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2022-11-25 23:24:25,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:25,685 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:25,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-25 23:24:25,685 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:25,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:25,686 INFO L85 PathProgramCache]: Analyzing trace with hash -1063027403, now seen corresponding path program 1 times [2022-11-25 23:24:25,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:25,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708750769] [2022-11-25 23:24:25,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:25,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:25,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:26,570 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-25 23:24:26,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:26,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708750769] [2022-11-25 23:24:26,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708750769] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:26,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:24:26,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:24:26,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569193202] [2022-11-25 23:24:26,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:26,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:26,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:26,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:26,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:26,575 INFO L87 Difference]: Start difference. First operand 5437 states and 7744 transitions. Second operand has 3 states, 3 states have (on average 61.666666666666664) internal successors, (185), 2 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:27,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:27,644 INFO L93 Difference]: Finished difference Result 12446 states and 17670 transitions. [2022-11-25 23:24:27,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:27,645 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 61.666666666666664) internal successors, (185), 2 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 203 [2022-11-25 23:24:27,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:27,674 INFO L225 Difference]: With dead ends: 12446 [2022-11-25 23:24:27,675 INFO L226 Difference]: Without dead ends: 7010 [2022-11-25 23:24:27,682 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:24:27,683 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 116 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:27,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 80 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:24:27,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7010 states. [2022-11-25 23:24:27,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7010 to 7010. [2022-11-25 23:24:27,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7010 states, 7009 states have (on average 1.4056213439863032) internal successors, (9852), 7009 states have internal predecessors, (9852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:27,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7010 states to 7010 states and 9852 transitions. [2022-11-25 23:24:27,920 INFO L78 Accepts]: Start accepts. Automaton has 7010 states and 9852 transitions. Word has length 203 [2022-11-25 23:24:27,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:27,926 INFO L495 AbstractCegarLoop]: Abstraction has 7010 states and 9852 transitions. [2022-11-25 23:24:27,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 61.666666666666664) internal successors, (185), 2 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:27,927 INFO L276 IsEmpty]: Start isEmpty. Operand 7010 states and 9852 transitions. [2022-11-25 23:24:27,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2022-11-25 23:24:27,940 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:27,940 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:27,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-25 23:24:27,941 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:27,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:27,941 INFO L85 PathProgramCache]: Analyzing trace with hash 633563706, now seen corresponding path program 1 times [2022-11-25 23:24:27,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:27,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896514638] [2022-11-25 23:24:27,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:27,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:28,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:28,631 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 72 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-25 23:24:28,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:28,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896514638] [2022-11-25 23:24:28,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896514638] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:24:28,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784471330] [2022-11-25 23:24:28,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:28,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:28,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:28,639 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:24:28,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:24:28,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:28,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 23:24:28,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:24:29,058 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:24:29,059 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:24:29,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784471330] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:24:29,060 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:24:29,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-25 23:24:29,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100007577] [2022-11-25 23:24:29,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:24:29,061 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:24:29,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:29,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:24:29,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:24:29,063 INFO L87 Difference]: Start difference. First operand 7010 states and 9852 transitions. Second operand has 3 states, 3 states have (on average 68.33333333333333) internal successors, (205), 3 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:30,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:30,020 INFO L93 Difference]: Finished difference Result 17451 states and 25230 transitions. [2022-11-25 23:24:30,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:24:30,021 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 68.33333333333333) internal successors, (205), 3 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 210 [2022-11-25 23:24:30,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:30,045 INFO L225 Difference]: With dead ends: 17451 [2022-11-25 23:24:30,046 INFO L226 Difference]: Without dead ends: 10585 [2022-11-25 23:24:30,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:24:30,055 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 137 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:30,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 85 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:24:30,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10585 states. [2022-11-25 23:24:30,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10585 to 10013. [2022-11-25 23:24:30,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10013 states, 10012 states have (on average 1.3289053136236517) internal successors, (13305), 10012 states have internal predecessors, (13305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:30,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10013 states to 10013 states and 13305 transitions. [2022-11-25 23:24:30,384 INFO L78 Accepts]: Start accepts. Automaton has 10013 states and 13305 transitions. Word has length 210 [2022-11-25 23:24:30,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:30,385 INFO L495 AbstractCegarLoop]: Abstraction has 10013 states and 13305 transitions. [2022-11-25 23:24:30,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 68.33333333333333) internal successors, (205), 3 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:24:30,386 INFO L276 IsEmpty]: Start isEmpty. Operand 10013 states and 13305 transitions. [2022-11-25 23:24:30,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2022-11-25 23:24:30,402 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:30,406 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:30,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:24:30,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:30,623 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:30,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:30,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1000523406, now seen corresponding path program 1 times [2022-11-25 23:24:30,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:30,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583684974] [2022-11-25 23:24:30,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:30,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:30,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:32,515 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 77 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:32,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:32,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583684974] [2022-11-25 23:24:32,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583684974] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:24:32,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819951027] [2022-11-25 23:24:32,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:32,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:32,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:32,518 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:24:32,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:24:32,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:32,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:24:32,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:24:33,321 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:33,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:24:33,709 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:33,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819951027] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:24:33,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298563288] [2022-11-25 23:24:33,748 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2022-11-25 23:24:33,748 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:24:33,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:24:33,761 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:24:33,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:25:05,851 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:25:05,888 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:25:06,058 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:25:09,601 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:25:21,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [298563288] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:25:21,996 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:25:21,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [4, 4, 4] total 15 [2022-11-25 23:25:21,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638836477] [2022-11-25 23:25:21,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:25:21,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:25:21,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:25:21,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:25:21,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:25:21,999 INFO L87 Difference]: Start difference. First operand 10013 states and 13305 transitions. Second operand has 10 states, 10 states have (on average 14.6) internal successors, (146), 9 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:26,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:25:26,274 INFO L93 Difference]: Finished difference Result 20169 states and 26781 transitions. [2022-11-25 23:25:26,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:25:26,278 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.6) internal successors, (146), 9 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 221 [2022-11-25 23:25:26,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:25:26,300 INFO L225 Difference]: With dead ends: 20169 [2022-11-25 23:25:26,300 INFO L226 Difference]: Without dead ends: 10300 [2022-11-25 23:25:26,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 501 SyntacticMatches, 151 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2022-11-25 23:25:26,313 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 226 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 1650 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:25:26,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 113 Invalid, 1669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1650 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-25 23:25:26,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10300 states. [2022-11-25 23:25:26,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10300 to 10290. [2022-11-25 23:25:26,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10290 states, 10289 states have (on average 1.321799980561765) internal successors, (13600), 10289 states have internal predecessors, (13600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:26,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10290 states to 10290 states and 13600 transitions. [2022-11-25 23:25:26,518 INFO L78 Accepts]: Start accepts. Automaton has 10290 states and 13600 transitions. Word has length 221 [2022-11-25 23:25:26,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:25:26,519 INFO L495 AbstractCegarLoop]: Abstraction has 10290 states and 13600 transitions. [2022-11-25 23:25:26,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.6) internal successors, (146), 9 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:26,521 INFO L276 IsEmpty]: Start isEmpty. Operand 10290 states and 13600 transitions. [2022-11-25 23:25:26,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2022-11-25 23:25:26,540 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:25:26,540 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:25:26,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:25:26,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:25:26,747 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:25:26,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:25:26,748 INFO L85 PathProgramCache]: Analyzing trace with hash -348328759, now seen corresponding path program 1 times [2022-11-25 23:25:26,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:25:26,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647785188] [2022-11-25 23:25:26,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:25:26,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:25:26,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:25:26,996 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 132 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:25:26,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:25:26,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647785188] [2022-11-25 23:25:26,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647785188] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:25:26,997 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:25:26,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:25:26,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655294557] [2022-11-25 23:25:26,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:25:26,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:25:26,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:25:26,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:25:27,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:25:27,000 INFO L87 Difference]: Start difference. First operand 10290 states and 13600 transitions. Second operand has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:27,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:25:27,972 INFO L93 Difference]: Finished difference Result 23734 states and 31685 transitions. [2022-11-25 23:25:27,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:25:27,972 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2022-11-25 23:25:27,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:25:28,003 INFO L225 Difference]: With dead ends: 23734 [2022-11-25 23:25:28,003 INFO L226 Difference]: Without dead ends: 13865 [2022-11-25 23:25:28,016 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:25:28,017 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 165 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:25:28,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 206 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:25:28,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13865 states. [2022-11-25 23:25:28,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13865 to 13865. [2022-11-25 23:25:28,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13865 states, 13864 states have (on average 1.2901759953837277) internal successors, (17887), 13864 states have internal predecessors, (17887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:28,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13865 states to 13865 states and 17887 transitions. [2022-11-25 23:25:28,302 INFO L78 Accepts]: Start accepts. Automaton has 13865 states and 17887 transitions. Word has length 258 [2022-11-25 23:25:28,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:25:28,302 INFO L495 AbstractCegarLoop]: Abstraction has 13865 states and 17887 transitions. [2022-11-25 23:25:28,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:28,303 INFO L276 IsEmpty]: Start isEmpty. Operand 13865 states and 17887 transitions. [2022-11-25 23:25:28,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-11-25 23:25:28,323 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:25:28,323 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:25:28,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-25 23:25:28,324 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:25:28,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:25:28,325 INFO L85 PathProgramCache]: Analyzing trace with hash -780387649, now seen corresponding path program 1 times [2022-11-25 23:25:28,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:25:28,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497455164] [2022-11-25 23:25:28,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:25:28,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:25:28,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:25:28,610 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 140 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:25:28,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:25:28,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497455164] [2022-11-25 23:25:28,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497455164] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:25:28,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:25:28,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:25:28,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455056614] [2022-11-25 23:25:28,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:25:28,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:25:28,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:25:28,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:25:28,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:25:28,614 INFO L87 Difference]: Start difference. First operand 13865 states and 17887 transitions. Second operand has 3 states, 3 states have (on average 87.33333333333333) internal successors, (262), 3 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:29,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:25:29,724 INFO L93 Difference]: Finished difference Result 29597 states and 38117 transitions. [2022-11-25 23:25:29,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:25:29,725 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 87.33333333333333) internal successors, (262), 3 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2022-11-25 23:25:29,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:25:29,762 INFO L225 Difference]: With dead ends: 29597 [2022-11-25 23:25:29,762 INFO L226 Difference]: Without dead ends: 16153 [2022-11-25 23:25:29,781 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:25:29,782 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 148 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:25:29,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 204 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:25:29,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16153 states. [2022-11-25 23:25:30,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16153 to 14723. [2022-11-25 23:25:30,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14723 states, 14722 states have (on average 1.239777204184214) internal successors, (18252), 14722 states have internal predecessors, (18252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:30,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14723 states to 14723 states and 18252 transitions. [2022-11-25 23:25:30,103 INFO L78 Accepts]: Start accepts. Automaton has 14723 states and 18252 transitions. Word has length 262 [2022-11-25 23:25:30,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:25:30,104 INFO L495 AbstractCegarLoop]: Abstraction has 14723 states and 18252 transitions. [2022-11-25 23:25:30,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 87.33333333333333) internal successors, (262), 3 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:30,104 INFO L276 IsEmpty]: Start isEmpty. Operand 14723 states and 18252 transitions. [2022-11-25 23:25:30,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2022-11-25 23:25:30,123 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:25:30,123 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2022-11-25 23:25:30,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-25 23:25:30,124 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:25:30,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:25:30,124 INFO L85 PathProgramCache]: Analyzing trace with hash 2134185358, now seen corresponding path program 1 times [2022-11-25 23:25:30,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:25:30,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391239282] [2022-11-25 23:25:30,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:25:30,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:25:30,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:25:30,643 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2022-11-25 23:25:30,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:25:30,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391239282] [2022-11-25 23:25:30,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391239282] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:25:30,644 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:25:30,645 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:25:30,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621864191] [2022-11-25 23:25:30,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:25:30,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:25:30,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:25:30,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:25:30,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:25:30,647 INFO L87 Difference]: Start difference. First operand 14723 states and 18252 transitions. Second operand has 4 states, 4 states have (on average 48.75) internal successors, (195), 3 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:31,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:25:31,528 INFO L93 Difference]: Finished difference Result 29025 states and 36045 transitions. [2022-11-25 23:25:31,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:25:31,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.75) internal successors, (195), 3 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 270 [2022-11-25 23:25:31,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:25:31,551 INFO L225 Difference]: With dead ends: 29025 [2022-11-25 23:25:31,552 INFO L226 Difference]: Without dead ends: 14723 [2022-11-25 23:25:31,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:25:31,562 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 440 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:25:31,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [440 Valid, 10 Invalid, 701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:25:31,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14723 states. [2022-11-25 23:25:31,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14723 to 14723. [2022-11-25 23:25:31,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14723 states, 14722 states have (on average 1.2269392745550876) internal successors, (18063), 14722 states have internal predecessors, (18063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:31,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14723 states to 14723 states and 18063 transitions. [2022-11-25 23:25:31,797 INFO L78 Accepts]: Start accepts. Automaton has 14723 states and 18063 transitions. Word has length 270 [2022-11-25 23:25:31,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:25:31,798 INFO L495 AbstractCegarLoop]: Abstraction has 14723 states and 18063 transitions. [2022-11-25 23:25:31,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.75) internal successors, (195), 3 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:25:31,798 INFO L276 IsEmpty]: Start isEmpty. Operand 14723 states and 18063 transitions. [2022-11-25 23:25:31,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-11-25 23:25:31,816 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:25:31,817 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:25:31,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-25 23:25:31,817 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:25:31,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:25:31,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1400963016, now seen corresponding path program 1 times [2022-11-25 23:25:31,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:25:31,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047853660] [2022-11-25 23:25:31,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:25:31,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:25:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:25:32,740 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:25:32,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:25:32,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047853660] [2022-11-25 23:25:32,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047853660] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:25:32,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720899396] [2022-11-25 23:25:32,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:25:32,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:25:32,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:25:32,743 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:25:32,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:25:32,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:25:32,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:25:32,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:25:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 127 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:25:33,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:25:33,836 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 127 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:25:33,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720899396] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:25:33,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [790127660] [2022-11-25 23:25:33,851 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2022-11-25 23:25:33,852 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:25:33,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:25:33,852 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:25:33,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:31:30,456 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:31:30,474 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 10288 conjuctions. This might take some time... [2022-11-25 23:31:31,664 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 768 conjuctions. [2022-11-25 23:31:31,706 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:31:31,725 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 10288 conjuctions. This might take some time... [2022-11-25 23:31:32,804 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 768 conjuctions. [2022-11-25 23:31:33,608 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2022-11-25 23:31:33,627 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 10288 conjuctions. This might take some time... [2022-11-25 23:31:34,766 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 768 conjuctions. [2022-11-25 23:32:11,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:32:38,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [790127660] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:38,103 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:32:38,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 3, 3] total 12 [2022-11-25 23:32:38,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342841330] [2022-11-25 23:32:38,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:38,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:32:38,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:38,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:32:38,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:32:38,106 INFO L87 Difference]: Start difference. First operand 14723 states and 18063 transitions. Second operand has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 6 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:45,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:32:45,175 INFO L93 Difference]: Finished difference Result 29330 states and 36139 transitions. [2022-11-25 23:32:45,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:32:45,176 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 6 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2022-11-25 23:32:45,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:32:45,197 INFO L225 Difference]: With dead ends: 29330 [2022-11-25 23:32:45,197 INFO L226 Difference]: Without dead ends: 15028 [2022-11-25 23:32:45,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 557 SyntacticMatches, 247 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1507 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2022-11-25 23:32:45,206 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 418 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 1521 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:32:45,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [418 Valid, 114 Invalid, 1623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1521 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-25 23:32:45,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15028 states. [2022-11-25 23:32:45,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15028 to 15007. [2022-11-25 23:32:45,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15007 states, 15006 states have (on average 1.230107956817273) internal successors, (18459), 15006 states have internal predecessors, (18459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:45,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15007 states to 15007 states and 18459 transitions. [2022-11-25 23:32:45,483 INFO L78 Accepts]: Start accepts. Automaton has 15007 states and 18459 transitions. Word has length 271 [2022-11-25 23:32:45,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:32:45,484 INFO L495 AbstractCegarLoop]: Abstraction has 15007 states and 18459 transitions. [2022-11-25 23:32:45,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 6 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:45,484 INFO L276 IsEmpty]: Start isEmpty. Operand 15007 states and 18459 transitions. [2022-11-25 23:32:45,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2022-11-25 23:32:45,499 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:32:45,499 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:32:45,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:32:45,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 23:32:45,707 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:32:45,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:32:45,708 INFO L85 PathProgramCache]: Analyzing trace with hash 943661051, now seen corresponding path program 1 times [2022-11-25 23:32:45,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:32:45,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309379123] [2022-11-25 23:32:45,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:45,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:32:45,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:46,387 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 142 proven. 3 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-25 23:32:46,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:32:46,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309379123] [2022-11-25 23:32:46,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309379123] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:32:46,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626923588] [2022-11-25 23:32:46,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:46,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:32:46,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:32:46,389 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:32:46,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:32:46,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:46,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 23:32:46,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:32:46,825 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 153 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-25 23:32:46,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:32:46,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626923588] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:46,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:32:46,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-25 23:32:46,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878865783] [2022-11-25 23:32:46,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:46,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:32:46,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:46,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:32:46,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:46,828 INFO L87 Difference]: Start difference. First operand 15007 states and 18459 transitions. Second operand has 3 states, 3 states have (on average 81.0) internal successors, (243), 2 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:47,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:32:47,299 INFO L93 Difference]: Finished difference Result 39464 states and 48467 transitions. [2022-11-25 23:32:47,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:32:47,299 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 81.0) internal successors, (243), 2 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 280 [2022-11-25 23:32:47,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:32:47,335 INFO L225 Difference]: With dead ends: 39464 [2022-11-25 23:32:47,336 INFO L226 Difference]: Without dead ends: 25162 [2022-11-25 23:32:47,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:47,349 INFO L413 NwaCegarLoop]: 195 mSDtfsCounter, 154 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:32:47,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 371 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:32:47,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25162 states. [2022-11-25 23:32:47,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25162 to 25160. [2022-11-25 23:32:47,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25160 states, 25159 states have (on average 1.225088437537263) internal successors, (30822), 25159 states have internal predecessors, (30822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:47,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25160 states to 25160 states and 30822 transitions. [2022-11-25 23:32:47,776 INFO L78 Accepts]: Start accepts. Automaton has 25160 states and 30822 transitions. Word has length 280 [2022-11-25 23:32:47,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:32:47,776 INFO L495 AbstractCegarLoop]: Abstraction has 25160 states and 30822 transitions. [2022-11-25 23:32:47,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 81.0) internal successors, (243), 2 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:47,777 INFO L276 IsEmpty]: Start isEmpty. Operand 25160 states and 30822 transitions. [2022-11-25 23:32:47,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2022-11-25 23:32:47,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:32:47,794 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:32:47,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:32:48,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:32:48,002 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:32:48,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:32:48,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1995103404, now seen corresponding path program 1 times [2022-11-25 23:32:48,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:32:48,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481935532] [2022-11-25 23:32:48,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:48,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:32:48,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:48,576 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 143 proven. 3 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-25 23:32:48,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:32:48,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481935532] [2022-11-25 23:32:48,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481935532] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:32:48,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293205977] [2022-11-25 23:32:48,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:48,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:32:48,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:32:48,579 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:32:48,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:32:48,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:48,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:32:48,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:32:48,868 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 178 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:32:48,869 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:32:48,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293205977] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:48,869 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:32:48,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-25 23:32:48,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131995517] [2022-11-25 23:32:48,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:48,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:32:48,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:48,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:32:48,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:48,872 INFO L87 Difference]: Start difference. First operand 25160 states and 30822 transitions. Second operand has 3 states, 3 states have (on average 88.33333333333333) internal successors, (265), 3 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:49,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:32:49,842 INFO L93 Difference]: Finished difference Result 56765 states and 69803 transitions. [2022-11-25 23:32:49,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:32:49,843 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.33333333333333) internal successors, (265), 3 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 281 [2022-11-25 23:32:49,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:32:49,991 INFO L225 Difference]: With dead ends: 56765 [2022-11-25 23:32:49,992 INFO L226 Difference]: Without dead ends: 32310 [2022-11-25 23:32:50,002 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:50,004 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 135 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:32:50,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 236 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:32:50,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32310 states. [2022-11-25 23:32:50,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32310 to 31738. [2022-11-25 23:32:50,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31738 states, 31737 states have (on average 1.2149856634212433) internal successors, (38560), 31737 states have internal predecessors, (38560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:50,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31738 states to 31738 states and 38560 transitions. [2022-11-25 23:32:50,520 INFO L78 Accepts]: Start accepts. Automaton has 31738 states and 38560 transitions. Word has length 281 [2022-11-25 23:32:50,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:32:50,521 INFO L495 AbstractCegarLoop]: Abstraction has 31738 states and 38560 transitions. [2022-11-25 23:32:50,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.33333333333333) internal successors, (265), 3 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:50,521 INFO L276 IsEmpty]: Start isEmpty. Operand 31738 states and 38560 transitions. [2022-11-25 23:32:50,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2022-11-25 23:32:50,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:32:50,544 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:32:50,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:32:50,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:32:50,751 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:32:50,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:32:50,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1125280339, now seen corresponding path program 1 times [2022-11-25 23:32:50,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:32:50,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219844921] [2022-11-25 23:32:50,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:50,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:32:50,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:51,326 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 147 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:32:51,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:32:51,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219844921] [2022-11-25 23:32:51,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219844921] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:32:51,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819790821] [2022-11-25 23:32:51,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:51,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:32:51,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:32:51,329 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:32:51,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:32:51,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:51,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 23:32:51,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:32:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-25 23:32:51,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:32:51,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819790821] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:51,750 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:32:51,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-25 23:32:51,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171333309] [2022-11-25 23:32:51,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:51,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:32:51,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:51,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:32:51,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:51,753 INFO L87 Difference]: Start difference. First operand 31738 states and 38560 transitions. Second operand has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 2 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:52,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:32:52,494 INFO L93 Difference]: Finished difference Result 91802 states and 111743 transitions. [2022-11-25 23:32:52,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:32:52,494 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 2 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 288 [2022-11-25 23:32:52,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:32:52,573 INFO L225 Difference]: With dead ends: 91802 [2022-11-25 23:32:52,573 INFO L226 Difference]: Without dead ends: 60769 [2022-11-25 23:32:52,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:32:52,598 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 143 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:32:52,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 344 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:32:52,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60769 states. [2022-11-25 23:32:53,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60769 to 60767. [2022-11-25 23:32:53,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60767 states, 60766 states have (on average 1.2168153243590165) internal successors, (73941), 60766 states have internal predecessors, (73941), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:53,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60767 states to 60767 states and 73941 transitions. [2022-11-25 23:32:53,590 INFO L78 Accepts]: Start accepts. Automaton has 60767 states and 73941 transitions. Word has length 288 [2022-11-25 23:32:53,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:32:53,590 INFO L495 AbstractCegarLoop]: Abstraction has 60767 states and 73941 transitions. [2022-11-25 23:32:53,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 2 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:53,591 INFO L276 IsEmpty]: Start isEmpty. Operand 60767 states and 73941 transitions. [2022-11-25 23:32:53,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2022-11-25 23:32:53,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:32:53,621 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:32:53,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:32:53,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 23:32:53,828 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:32:53,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:32:53,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1096600285, now seen corresponding path program 1 times [2022-11-25 23:32:53,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:32:53,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146536667] [2022-11-25 23:32:53,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:53,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:32:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:54,191 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 171 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:32:54,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:32:54,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146536667] [2022-11-25 23:32:54,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146536667] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:54,192 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:32:54,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:32:54,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309922964] [2022-11-25 23:32:54,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:54,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:32:54,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:54,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:32:54,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:32:54,194 INFO L87 Difference]: Start difference. First operand 60767 states and 73941 transitions. Second operand has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:55,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:32:55,530 INFO L93 Difference]: Finished difference Result 123974 states and 150840 transitions. [2022-11-25 23:32:55,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:32:55,530 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2022-11-25 23:32:55,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:32:55,601 INFO L225 Difference]: With dead ends: 123974 [2022-11-25 23:32:55,601 INFO L226 Difference]: Without dead ends: 63628 [2022-11-25 23:32:55,642 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:32:55,643 INFO L413 NwaCegarLoop]: 183 mSDtfsCounter, 156 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:32:55,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 186 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:32:55,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63628 states. [2022-11-25 23:32:56,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63628 to 61769. [2022-11-25 23:32:56,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61769 states, 61768 states have (on average 1.2124886672710788) internal successors, (74893), 61768 states have internal predecessors, (74893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:56,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61769 states to 61769 states and 74893 transitions. [2022-11-25 23:32:56,716 INFO L78 Accepts]: Start accepts. Automaton has 61769 states and 74893 transitions. Word has length 290 [2022-11-25 23:32:56,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:32:56,717 INFO L495 AbstractCegarLoop]: Abstraction has 61769 states and 74893 transitions. [2022-11-25 23:32:56,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:32:56,717 INFO L276 IsEmpty]: Start isEmpty. Operand 61769 states and 74893 transitions. [2022-11-25 23:32:56,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2022-11-25 23:32:56,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:32:56,733 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:32:56,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-11-25 23:32:56,733 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:32:56,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:32:56,734 INFO L85 PathProgramCache]: Analyzing trace with hash 531216967, now seen corresponding path program 1 times [2022-11-25 23:32:56,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:32:56,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268694339] [2022-11-25 23:32:56,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:56,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:32:56,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:59,088 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 130 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:32:59,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:32:59,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268694339] [2022-11-25 23:32:59,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268694339] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:32:59,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534657000] [2022-11-25 23:32:59,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:32:59,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:32:59,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:32:59,091 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:32:59,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:32:59,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:32:59,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 23:32:59,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:32:59,572 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:32:59,573 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:32:59,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534657000] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:32:59,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:32:59,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-25 23:32:59,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028177157] [2022-11-25 23:32:59,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:32:59,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:32:59,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:32:59,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:32:59,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:32:59,576 INFO L87 Difference]: Start difference. First operand 61769 states and 74893 transitions. Second operand has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:01,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:01,014 INFO L93 Difference]: Finished difference Result 129553 states and 158073 transitions. [2022-11-25 23:33:01,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:33:01,015 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2022-11-25 23:33:01,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:01,105 INFO L225 Difference]: With dead ends: 129553 [2022-11-25 23:33:01,105 INFO L226 Difference]: Without dead ends: 68347 [2022-11-25 23:33:01,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:33:01,145 INFO L413 NwaCegarLoop]: 190 mSDtfsCounter, 41 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:01,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 194 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:33:01,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68347 states. [2022-11-25 23:33:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68347 to 68338. [2022-11-25 23:33:02,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68338 states, 68337 states have (on average 1.2213881206374293) internal successors, (83466), 68337 states have internal predecessors, (83466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:02,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68338 states to 68338 states and 83466 transitions. [2022-11-25 23:33:02,520 INFO L78 Accepts]: Start accepts. Automaton has 68338 states and 83466 transitions. Word has length 290 [2022-11-25 23:33:02,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:02,520 INFO L495 AbstractCegarLoop]: Abstraction has 68338 states and 83466 transitions. [2022-11-25 23:33:02,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:02,521 INFO L276 IsEmpty]: Start isEmpty. Operand 68338 states and 83466 transitions. [2022-11-25 23:33:02,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2022-11-25 23:33:02,541 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:02,541 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:02,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:02,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4713301-6484-4735-827e-0b6a092a3dc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:02,742 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:02,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:02,742 INFO L85 PathProgramCache]: Analyzing trace with hash -207111509, now seen corresponding path program 1 times [2022-11-25 23:33:02,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:02,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637526235] [2022-11-25 23:33:02,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:02,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:03,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:03,364 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 162 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:33:03,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:03,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637526235] [2022-11-25 23:33:03,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637526235] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:03,365 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:03,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:03,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648945145] [2022-11-25 23:33:03,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:03,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:33:03,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:03,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:33:03,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:33:03,368 INFO L87 Difference]: Start difference. First operand 68338 states and 83466 transitions. Second operand has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:04,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:04,893 INFO L93 Difference]: Finished difference Result 142414 states and 173565 transitions. [2022-11-25 23:33:04,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:33:04,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 292 [2022-11-25 23:33:04,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:04,972 INFO L225 Difference]: With dead ends: 142414 [2022-11-25 23:33:04,972 INFO L226 Difference]: Without dead ends: 74630 [2022-11-25 23:33:04,999 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:33:04,999 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:05,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 226 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:33:05,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74630 states. [2022-11-25 23:33:06,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74630 to 73486. [2022-11-25 23:33:06,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73486 states, 73485 states have (on average 1.2066544192692386) internal successors, (88671), 73485 states have internal predecessors, (88671), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:06,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73486 states to 73486 states and 88671 transitions. [2022-11-25 23:33:06,378 INFO L78 Accepts]: Start accepts. Automaton has 73486 states and 88671 transitions. Word has length 292 [2022-11-25 23:33:06,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:06,378 INFO L495 AbstractCegarLoop]: Abstraction has 73486 states and 88671 transitions. [2022-11-25 23:33:06,378 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:06,378 INFO L276 IsEmpty]: Start isEmpty. Operand 73486 states and 88671 transitions. [2022-11-25 23:33:06,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2022-11-25 23:33:06,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:06,409 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:06,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-11-25 23:33:06,409 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:06,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:06,410 INFO L85 PathProgramCache]: Analyzing trace with hash 966192851, now seen corresponding path program 1 times [2022-11-25 23:33:06,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:06,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825830015] [2022-11-25 23:33:06,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:06,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:06,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:06,989 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 179 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:33:06,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:06,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825830015] [2022-11-25 23:33:06,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825830015] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:06,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:06,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:06,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615736668] [2022-11-25 23:33:06,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:06,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:33:06,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:06,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:33:06,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:33:06,992 INFO L87 Difference]: Start difference. First operand 73486 states and 88671 transitions. Second operand has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:08,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:08,389 INFO L93 Difference]: Finished difference Result 146132 states and 175094 transitions. [2022-11-25 23:33:08,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:33:08,390 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 294 [2022-11-25 23:33:08,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:08,469 INFO L225 Difference]: With dead ends: 146132 [2022-11-25 23:33:08,469 INFO L226 Difference]: Without dead ends: 73200 [2022-11-25 23:33:08,497 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:33:08,498 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 136 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:08,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 189 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:33:08,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73200 states. [2022-11-25 23:33:09,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73200 to 69482. [2022-11-25 23:33:09,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69482 states, 69481 states have (on average 1.1897497157496293) internal successors, (82665), 69481 states have internal predecessors, (82665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:10,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69482 states to 69482 states and 82665 transitions. [2022-11-25 23:33:10,019 INFO L78 Accepts]: Start accepts. Automaton has 69482 states and 82665 transitions. Word has length 294 [2022-11-25 23:33:10,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:10,020 INFO L495 AbstractCegarLoop]: Abstraction has 69482 states and 82665 transitions. [2022-11-25 23:33:10,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:10,020 INFO L276 IsEmpty]: Start isEmpty. Operand 69482 states and 82665 transitions. [2022-11-25 23:33:10,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2022-11-25 23:33:10,035 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:10,035 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2022-11-25 23:33:10,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-11-25 23:33:10,036 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:10,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:10,036 INFO L85 PathProgramCache]: Analyzing trace with hash -352503826, now seen corresponding path program 1 times [2022-11-25 23:33:10,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:10,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520964747] [2022-11-25 23:33:10,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:10,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:10,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:10,319 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 118 proven. 0 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2022-11-25 23:33:10,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:10,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520964747] [2022-11-25 23:33:10,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520964747] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:10,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:10,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:10,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613568232] [2022-11-25 23:33:10,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:10,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:33:10,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:10,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:33:10,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:10,323 INFO L87 Difference]: Start difference. First operand 69482 states and 82665 transitions. Second operand has 4 states, 4 states have (on average 42.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:13,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:13,373 INFO L93 Difference]: Finished difference Result 248238 states and 294546 transitions. [2022-11-25 23:33:13,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:33:13,373 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 42.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 294 [2022-11-25 23:33:13,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:13,579 INFO L225 Difference]: With dead ends: 248238 [2022-11-25 23:33:13,579 INFO L226 Difference]: Without dead ends: 179310 [2022-11-25 23:33:13,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:13,615 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 391 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 962 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 1086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 962 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:13,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 18 Invalid, 1086 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 962 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-25 23:33:13,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179310 states. [2022-11-25 23:33:16,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179310 to 175016. [2022-11-25 23:33:16,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175016 states, 175015 states have (on average 1.1844756163757393) internal successors, (207301), 175015 states have internal predecessors, (207301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:17,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175016 states to 175016 states and 207301 transitions. [2022-11-25 23:33:17,086 INFO L78 Accepts]: Start accepts. Automaton has 175016 states and 207301 transitions. Word has length 294 [2022-11-25 23:33:17,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:17,086 INFO L495 AbstractCegarLoop]: Abstraction has 175016 states and 207301 transitions. [2022-11-25 23:33:17,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 42.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:17,086 INFO L276 IsEmpty]: Start isEmpty. Operand 175016 states and 207301 transitions. [2022-11-25 23:33:17,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2022-11-25 23:33:17,099 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:17,099 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:17,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-11-25 23:33:17,100 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:17,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:17,100 INFO L85 PathProgramCache]: Analyzing trace with hash 425322024, now seen corresponding path program 1 times [2022-11-25 23:33:17,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:17,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087973556] [2022-11-25 23:33:17,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:17,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:17,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:17,319 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 207 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-25 23:33:17,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:17,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087973556] [2022-11-25 23:33:17,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087973556] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:17,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:17,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:17,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278277368] [2022-11-25 23:33:17,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:17,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:33:17,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:17,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:33:17,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:33:17,322 INFO L87 Difference]: Start difference. First operand 175016 states and 207301 transitions. Second operand has 3 states, 3 states have (on average 91.33333333333333) internal successors, (274), 3 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:20,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:20,015 INFO L93 Difference]: Finished difference Result 373216 states and 441609 transitions. [2022-11-25 23:33:20,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:33:20,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 91.33333333333333) internal successors, (274), 3 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 296 [2022-11-25 23:33:20,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:20,276 INFO L225 Difference]: With dead ends: 373216 [2022-11-25 23:33:20,276 INFO L226 Difference]: Without dead ends: 198754 [2022-11-25 23:33:20,341 INFO L412 NwaCegarLoop]: 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 [2022-11-25 23:33:20,342 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 125 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:20,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 236 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:33:20,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198754 states. [2022-11-25 23:33:24,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198754 to 182309. [2022-11-25 23:33:24,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182309 states, 182308 states have (on average 1.1850823880466024) internal successors, (216050), 182308 states have internal predecessors, (216050), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:24,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182309 states to 182309 states and 216050 transitions. [2022-11-25 23:33:24,629 INFO L78 Accepts]: Start accepts. Automaton has 182309 states and 216050 transitions. Word has length 296 [2022-11-25 23:33:24,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:24,629 INFO L495 AbstractCegarLoop]: Abstraction has 182309 states and 216050 transitions. [2022-11-25 23:33:24,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 91.33333333333333) internal successors, (274), 3 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:24,629 INFO L276 IsEmpty]: Start isEmpty. Operand 182309 states and 216050 transitions. [2022-11-25 23:33:24,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2022-11-25 23:33:24,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:24,650 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:24,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-11-25 23:33:24,651 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:24,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:24,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1523535984, now seen corresponding path program 1 times [2022-11-25 23:33:24,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:24,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19925172] [2022-11-25 23:33:24,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:24,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:24,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:25,000 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 194 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:33:25,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:25,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19925172] [2022-11-25 23:33:25,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19925172] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:25,001 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:25,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:25,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480653474] [2022-11-25 23:33:25,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:25,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:33:25,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:25,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:33:25,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:25,007 INFO L87 Difference]: Start difference. First operand 182309 states and 216050 transitions. Second operand has 4 states, 4 states have (on average 77.0) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:28,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:28,551 INFO L93 Difference]: Finished difference Result 364922 states and 432376 transitions. [2022-11-25 23:33:28,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:33:28,552 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 77.0) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 308 [2022-11-25 23:33:28,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:28,745 INFO L225 Difference]: With dead ends: 364922 [2022-11-25 23:33:28,745 INFO L226 Difference]: Without dead ends: 183167 [2022-11-25 23:33:28,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:28,807 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 153 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:28,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 44 Invalid, 1049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-25 23:33:28,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183167 states. [2022-11-25 23:33:32,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183167 to 176303. [2022-11-25 23:33:32,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176303 states, 176302 states have (on average 1.1861805311340767) internal successors, (209126), 176302 states have internal predecessors, (209126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)