./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH --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 b01ecc2cec2d3b25790e2e1261ee2a51c1fc74f823e2e108c953a6bc27a2446d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:16:36,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:16:36,955 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:16:36,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:16:36,997 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:16:36,998 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:16:37,000 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:16:37,003 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:16:37,005 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:16:37,007 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:16:37,008 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:16:37,010 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:16:37,010 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:16:37,012 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:16:37,014 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:16:37,015 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:16:37,017 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:16:37,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:16:37,020 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:16:37,023 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:16:37,025 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:16:37,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:16:37,028 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:16:37,029 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:16:37,034 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:16:37,034 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:16:37,035 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:16:37,036 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:16:37,036 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:16:37,038 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:16:37,038 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:16:37,039 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:16:37,040 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:16:37,041 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:16:37,042 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:16:37,043 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:16:37,044 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:16:37,044 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:16:37,044 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:16:37,046 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:16:37,047 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:16:37,048 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:16:37,074 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:16:37,074 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:16:37,075 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:16:37,076 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:16:37,076 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:16:37,076 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:16:37,077 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:16:37,077 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:16:37,078 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:16:37,078 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:16:37,078 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:16:37,079 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:16:37,079 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:16:37,080 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:16:37,080 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:16:37,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:16:37,081 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:16:37,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:16:37,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:16:37,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:16:37,082 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:16:37,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:16:37,083 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:16:37,083 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:16:37,083 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:16:37,084 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:16:37,084 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:16:37,084 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:16:37,084 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:16:37,085 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:16:37,085 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:16:37,085 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:16:37,085 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:16:37,086 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:16:37,086 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:16:37,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:16:37,086 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:16:37,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:16:37,087 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:16:37,087 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b01ecc2cec2d3b25790e2e1261ee2a51c1fc74f823e2e108c953a6bc27a2446d [2021-11-03 04:16:37,311 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:16:37,336 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:16:37,339 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:16:37,340 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:16:37,340 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:16:37,341 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 04:16:37,416 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/data/c35eb1664/913402cc5d3f40b5b08a15e3ccab58e5/FLAGb1adbd1bf [2021-11-03 04:16:37,952 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:16:37,956 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 04:16:37,978 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/data/c35eb1664/913402cc5d3f40b5b08a15e3ccab58e5/FLAGb1adbd1bf [2021-11-03 04:16:38,248 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/data/c35eb1664/913402cc5d3f40b5b08a15e3ccab58e5 [2021-11-03 04:16:38,251 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:16:38,252 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:16:38,254 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:16:38,254 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:16:38,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:16:38,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:38,259 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24241e69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38, skipping insertion in model container [2021-11-03 04:16:38,259 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:38,266 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:16:38,321 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:16:38,632 WARN L228 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_548f67c1-80e5-4161-9264-c8b2f397e734/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[13826,13839] [2021-11-03 04:16:38,736 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:16:38,753 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:16:38,906 WARN L228 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_548f67c1-80e5-4161-9264-c8b2f397e734/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[13826,13839] [2021-11-03 04:16:38,951 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:16:38,971 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:16:38,971 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38 WrapperNode [2021-11-03 04:16:38,971 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:16:38,973 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:16:38,973 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:16:38,973 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:16:38,996 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,018 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,100 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:16:39,101 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:16:39,101 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:16:39,101 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:16:39,115 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,123 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,125 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,158 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,185 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,203 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,211 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:16:39,220 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:16:39,220 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:16:39,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:16:39,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (1/1) ... [2021-11-03 04:16:39,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:16:39,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:16:39,273 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:16:39,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:16:39,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:16:39,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:16:39,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:16:39,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:16:41,686 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:16:41,686 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 04:16:41,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:16:41 BoogieIcfgContainer [2021-11-03 04:16:41,692 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:16:41,696 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:16:41,696 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:16:41,699 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:16:41,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:16:38" (1/3) ... [2021-11-03 04:16:41,700 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11f8f10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:16:41, skipping insertion in model container [2021-11-03 04:16:41,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:16:38" (2/3) ... [2021-11-03 04:16:41,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11f8f10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:16:41, skipping insertion in model container [2021-11-03 04:16:41,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:16:41" (3/3) ... [2021-11-03 04:16:41,702 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 04:16:41,713 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:16:41,713 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:16:41,776 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:16:41,784 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-03 04:16:41,785 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:16:41,814 INFO L276 IsEmpty]: Start isEmpty. Operand has 275 states, 273 states have (on average 1.6886446886446886) internal successors, (461), 274 states have internal predecessors, (461), 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) [2021-11-03 04:16:41,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-03 04:16:41,834 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:41,835 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:41,835 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:41,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:41,841 INFO L85 PathProgramCache]: Analyzing trace with hash -2044470680, now seen corresponding path program 1 times [2021-11-03 04:16:41,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:41,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837757453] [2021-11-03 04:16:41,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:41,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:42,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:42,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:42,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:42,405 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837757453] [2021-11-03 04:16:42,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837757453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:42,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:42,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:42,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122764865] [2021-11-03 04:16:42,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:42,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:42,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:42,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:42,464 INFO L87 Difference]: Start difference. First operand has 275 states, 273 states have (on average 1.6886446886446886) internal successors, (461), 274 states have internal predecessors, (461), 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 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 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) [2021-11-03 04:16:42,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:42,566 INFO L93 Difference]: Finished difference Result 469 states and 776 transitions. [2021-11-03 04:16:42,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:42,568 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 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 109 [2021-11-03 04:16:42,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:42,584 INFO L225 Difference]: With dead ends: 469 [2021-11-03 04:16:42,584 INFO L226 Difference]: Without dead ends: 358 [2021-11-03 04:16:42,588 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:42,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-03 04:16:42,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 356. [2021-11-03 04:16:42,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 355 states have (on average 1.5464788732394366) internal successors, (549), 355 states have internal predecessors, (549), 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) [2021-11-03 04:16:42,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 549 transitions. [2021-11-03 04:16:42,666 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 549 transitions. Word has length 109 [2021-11-03 04:16:42,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:42,667 INFO L470 AbstractCegarLoop]: Abstraction has 356 states and 549 transitions. [2021-11-03 04:16:42,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 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) [2021-11-03 04:16:42,667 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 549 transitions. [2021-11-03 04:16:42,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-03 04:16:42,670 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:42,671 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:42,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:16:42,671 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:42,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:42,672 INFO L85 PathProgramCache]: Analyzing trace with hash 1129979032, now seen corresponding path program 1 times [2021-11-03 04:16:42,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:42,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194256680] [2021-11-03 04:16:42,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:42,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:42,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:42,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:42,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:42,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194256680] [2021-11-03 04:16:42,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194256680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:42,841 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:42,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:42,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950624556] [2021-11-03 04:16:42,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:42,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:42,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:42,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:42,845 INFO L87 Difference]: Start difference. First operand 356 states and 549 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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) [2021-11-03 04:16:42,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:42,942 INFO L93 Difference]: Finished difference Result 650 states and 1030 transitions. [2021-11-03 04:16:42,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:42,944 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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 111 [2021-11-03 04:16:42,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:42,953 INFO L225 Difference]: With dead ends: 650 [2021-11-03 04:16:42,953 INFO L226 Difference]: Without dead ends: 462 [2021-11-03 04:16:42,958 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:42,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-03 04:16:43,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 460. [2021-11-03 04:16:43,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 1.5599128540305012) internal successors, (716), 459 states have internal predecessors, (716), 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) [2021-11-03 04:16:43,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 716 transitions. [2021-11-03 04:16:43,007 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 716 transitions. Word has length 111 [2021-11-03 04:16:43,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:43,008 INFO L470 AbstractCegarLoop]: Abstraction has 460 states and 716 transitions. [2021-11-03 04:16:43,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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) [2021-11-03 04:16:43,008 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 716 transitions. [2021-11-03 04:16:43,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-03 04:16:43,011 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:43,012 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:43,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:16:43,012 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:43,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:43,013 INFO L85 PathProgramCache]: Analyzing trace with hash -686425442, now seen corresponding path program 1 times [2021-11-03 04:16:43,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:43,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144411340] [2021-11-03 04:16:43,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:43,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:43,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:43,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:43,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:43,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144411340] [2021-11-03 04:16:43,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144411340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:43,162 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:43,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:43,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607072801] [2021-11-03 04:16:43,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:43,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:43,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:43,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,180 INFO L87 Difference]: Start difference. First operand 460 states and 716 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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) [2021-11-03 04:16:43,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:43,232 INFO L93 Difference]: Finished difference Result 980 states and 1565 transitions. [2021-11-03 04:16:43,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:43,234 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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 114 [2021-11-03 04:16:43,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:43,240 INFO L225 Difference]: With dead ends: 980 [2021-11-03 04:16:43,241 INFO L226 Difference]: Without dead ends: 690 [2021-11-03 04:16:43,243 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-11-03 04:16:43,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 688. [2021-11-03 04:16:43,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 688 states, 687 states have (on average 1.5822416302765647) internal successors, (1087), 687 states have internal predecessors, (1087), 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) [2021-11-03 04:16:43,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 688 states to 688 states and 1087 transitions. [2021-11-03 04:16:43,286 INFO L78 Accepts]: Start accepts. Automaton has 688 states and 1087 transitions. Word has length 114 [2021-11-03 04:16:43,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:43,316 INFO L470 AbstractCegarLoop]: Abstraction has 688 states and 1087 transitions. [2021-11-03 04:16:43,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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) [2021-11-03 04:16:43,317 INFO L276 IsEmpty]: Start isEmpty. Operand 688 states and 1087 transitions. [2021-11-03 04:16:43,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-03 04:16:43,320 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:43,321 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:43,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:16:43,322 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:43,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:43,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1955683090, now seen corresponding path program 1 times [2021-11-03 04:16:43,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:43,323 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337382019] [2021-11-03 04:16:43,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:43,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:43,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:43,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:43,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:43,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337382019] [2021-11-03 04:16:43,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337382019] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:43,472 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:43,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:43,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702947638] [2021-11-03 04:16:43,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:43,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:43,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:43,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,474 INFO L87 Difference]: Start difference. First operand 688 states and 1087 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 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) [2021-11-03 04:16:43,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:43,533 INFO L93 Difference]: Finished difference Result 1518 states and 2440 transitions. [2021-11-03 04:16:43,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:43,534 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 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 116 [2021-11-03 04:16:43,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:43,541 INFO L225 Difference]: With dead ends: 1518 [2021-11-03 04:16:43,541 INFO L226 Difference]: Without dead ends: 1000 [2021-11-03 04:16:43,544 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2021-11-03 04:16:43,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 998. [2021-11-03 04:16:43,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 997 states have (on average 1.5957873620862588) internal successors, (1591), 997 states have internal predecessors, (1591), 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) [2021-11-03 04:16:43,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1591 transitions. [2021-11-03 04:16:43,598 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1591 transitions. Word has length 116 [2021-11-03 04:16:43,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:43,599 INFO L470 AbstractCegarLoop]: Abstraction has 998 states and 1591 transitions. [2021-11-03 04:16:43,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 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) [2021-11-03 04:16:43,599 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1591 transitions. [2021-11-03 04:16:43,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-03 04:16:43,601 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:43,601 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:43,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:16:43,602 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:43,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:43,603 INFO L85 PathProgramCache]: Analyzing trace with hash -851857421, now seen corresponding path program 1 times [2021-11-03 04:16:43,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:43,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388726360] [2021-11-03 04:16:43,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:43,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:43,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:43,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:43,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:43,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388726360] [2021-11-03 04:16:43,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388726360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:43,727 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:43,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:43,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11570237] [2021-11-03 04:16:43,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:43,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:43,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:43,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,730 INFO L87 Difference]: Start difference. First operand 998 states and 1591 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 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) [2021-11-03 04:16:43,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:43,828 INFO L93 Difference]: Finished difference Result 2430 states and 3924 transitions. [2021-11-03 04:16:43,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:43,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 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 119 [2021-11-03 04:16:43,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:43,841 INFO L225 Difference]: With dead ends: 2430 [2021-11-03 04:16:43,841 INFO L226 Difference]: Without dead ends: 1624 [2021-11-03 04:16:43,843 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:43,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1624 states. [2021-11-03 04:16:43,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1624 to 1622. [2021-11-03 04:16:43,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1622 states, 1621 states have (on average 1.6033312769895127) internal successors, (2599), 1621 states have internal predecessors, (2599), 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) [2021-11-03 04:16:43,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1622 states to 1622 states and 2599 transitions. [2021-11-03 04:16:43,967 INFO L78 Accepts]: Start accepts. Automaton has 1622 states and 2599 transitions. Word has length 119 [2021-11-03 04:16:43,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:43,968 INFO L470 AbstractCegarLoop]: Abstraction has 1622 states and 2599 transitions. [2021-11-03 04:16:43,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 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) [2021-11-03 04:16:43,969 INFO L276 IsEmpty]: Start isEmpty. Operand 1622 states and 2599 transitions. [2021-11-03 04:16:43,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-03 04:16:43,970 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:43,971 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:43,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 04:16:43,971 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:43,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:43,972 INFO L85 PathProgramCache]: Analyzing trace with hash 715054474, now seen corresponding path program 1 times [2021-11-03 04:16:43,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:43,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110286201] [2021-11-03 04:16:43,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:43,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:44,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:44,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:44,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:44,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110286201] [2021-11-03 04:16:44,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110286201] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:44,080 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:44,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:44,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360625386] [2021-11-03 04:16:44,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:44,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:44,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:44,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:44,085 INFO L87 Difference]: Start difference. First operand 1622 states and 2599 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 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) [2021-11-03 04:16:44,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:44,247 INFO L93 Difference]: Finished difference Result 3880 states and 6271 transitions. [2021-11-03 04:16:44,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:44,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 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 121 [2021-11-03 04:16:44,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:44,263 INFO L225 Difference]: With dead ends: 3880 [2021-11-03 04:16:44,263 INFO L226 Difference]: Without dead ends: 2450 [2021-11-03 04:16:44,266 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:44,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2450 states. [2021-11-03 04:16:44,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2450 to 2448. [2021-11-03 04:16:44,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2448 states, 2447 states have (on average 1.6093175316714343) internal successors, (3938), 2447 states have internal predecessors, (3938), 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) [2021-11-03 04:16:44,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2448 states to 2448 states and 3938 transitions. [2021-11-03 04:16:44,457 INFO L78 Accepts]: Start accepts. Automaton has 2448 states and 3938 transitions. Word has length 121 [2021-11-03 04:16:44,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:44,458 INFO L470 AbstractCegarLoop]: Abstraction has 2448 states and 3938 transitions. [2021-11-03 04:16:44,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 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) [2021-11-03 04:16:44,459 INFO L276 IsEmpty]: Start isEmpty. Operand 2448 states and 3938 transitions. [2021-11-03 04:16:44,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-03 04:16:44,460 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:44,460 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:44,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 04:16:44,461 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:44,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:44,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1276539382, now seen corresponding path program 1 times [2021-11-03 04:16:44,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:44,466 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240806759] [2021-11-03 04:16:44,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:44,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:44,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:44,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:44,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:44,555 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240806759] [2021-11-03 04:16:44,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240806759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:44,555 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:44,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:44,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513544947] [2021-11-03 04:16:44,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:44,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:44,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:44,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:44,558 INFO L87 Difference]: Start difference. First operand 2448 states and 3938 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 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) [2021-11-03 04:16:44,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:44,860 INFO L93 Difference]: Finished difference Result 6376 states and 10303 transitions. [2021-11-03 04:16:44,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:44,861 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 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 124 [2021-11-03 04:16:44,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:44,888 INFO L225 Difference]: With dead ends: 6376 [2021-11-03 04:16:44,889 INFO L226 Difference]: Without dead ends: 4142 [2021-11-03 04:16:44,895 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:44,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4142 states. [2021-11-03 04:16:45,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4142 to 4140. [2021-11-03 04:16:45,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4140 states, 4139 states have (on average 1.605943464604977) internal successors, (6647), 4139 states have internal predecessors, (6647), 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) [2021-11-03 04:16:45,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4140 states to 4140 states and 6647 transitions. [2021-11-03 04:16:45,213 INFO L78 Accepts]: Start accepts. Automaton has 4140 states and 6647 transitions. Word has length 124 [2021-11-03 04:16:45,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:45,214 INFO L470 AbstractCegarLoop]: Abstraction has 4140 states and 6647 transitions. [2021-11-03 04:16:45,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 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) [2021-11-03 04:16:45,214 INFO L276 IsEmpty]: Start isEmpty. Operand 4140 states and 6647 transitions. [2021-11-03 04:16:45,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-03 04:16:45,216 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:45,216 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:45,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 04:16:45,217 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:45,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:45,217 INFO L85 PathProgramCache]: Analyzing trace with hash 1670401211, now seen corresponding path program 1 times [2021-11-03 04:16:45,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:45,218 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233633156] [2021-11-03 04:16:45,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:45,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:45,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:45,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:45,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:45,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233633156] [2021-11-03 04:16:45,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233633156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:45,332 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:45,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:16:45,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592809298] [2021-11-03 04:16:45,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:16:45,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:45,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:16:45,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:45,334 INFO L87 Difference]: Start difference. First operand 4140 states and 6647 transitions. Second operand has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 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) [2021-11-03 04:16:45,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:45,744 INFO L93 Difference]: Finished difference Result 10322 states and 16646 transitions. [2021-11-03 04:16:45,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:16:45,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 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 126 [2021-11-03 04:16:45,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:45,786 INFO L225 Difference]: With dead ends: 10322 [2021-11-03 04:16:45,786 INFO L226 Difference]: Without dead ends: 6396 [2021-11-03 04:16:45,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:16:45,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6396 states. [2021-11-03 04:16:46,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6396 to 6394. [2021-11-03 04:16:46,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6394 states, 6393 states have (on average 1.6081651806663537) internal successors, (10281), 6393 states have internal predecessors, (10281), 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) [2021-11-03 04:16:46,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6394 states to 6394 states and 10281 transitions. [2021-11-03 04:16:46,272 INFO L78 Accepts]: Start accepts. Automaton has 6394 states and 10281 transitions. Word has length 126 [2021-11-03 04:16:46,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:46,273 INFO L470 AbstractCegarLoop]: Abstraction has 6394 states and 10281 transitions. [2021-11-03 04:16:46,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 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) [2021-11-03 04:16:46,273 INFO L276 IsEmpty]: Start isEmpty. Operand 6394 states and 10281 transitions. [2021-11-03 04:16:46,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-03 04:16:46,275 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:46,275 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:46,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 04:16:46,276 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:46,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:46,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1229327834, now seen corresponding path program 1 times [2021-11-03 04:16:46,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:46,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158434715] [2021-11-03 04:16:46,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:46,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:46,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:46,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:46,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:46,397 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158434715] [2021-11-03 04:16:46,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158434715] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:46,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:46,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 04:16:46,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377206907] [2021-11-03 04:16:46,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:16:46,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:46,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:16:46,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:16:46,407 INFO L87 Difference]: Start difference. First operand 6394 states and 10281 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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) [2021-11-03 04:16:47,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:47,465 INFO L93 Difference]: Finished difference Result 16018 states and 25774 transitions. [2021-11-03 04:16:47,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 04:16:47,466 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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 129 [2021-11-03 04:16:47,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:47,544 INFO L225 Difference]: With dead ends: 16018 [2021-11-03 04:16:47,544 INFO L226 Difference]: Without dead ends: 9860 [2021-11-03 04:16:47,555 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-03 04:16:47,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9860 states. [2021-11-03 04:16:48,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9860 to 9846. [2021-11-03 04:16:48,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.600812595226003) internal successors, (15760), 9845 states have internal predecessors, (15760), 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) [2021-11-03 04:16:48,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15760 transitions. [2021-11-03 04:16:48,286 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15760 transitions. Word has length 129 [2021-11-03 04:16:48,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:48,287 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15760 transitions. [2021-11-03 04:16:48,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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) [2021-11-03 04:16:48,288 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15760 transitions. [2021-11-03 04:16:48,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-03 04:16:48,290 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:48,290 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:48,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-03 04:16:48,290 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:48,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:48,291 INFO L85 PathProgramCache]: Analyzing trace with hash 478480816, now seen corresponding path program 1 times [2021-11-03 04:16:48,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:48,293 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448217798] [2021-11-03 04:16:48,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:48,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:48,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:48,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:48,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:48,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448217798] [2021-11-03 04:16:48,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448217798] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:48,379 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:48,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:16:48,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637011817] [2021-11-03 04:16:48,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:16:48,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:48,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:16:48,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:16:48,389 INFO L87 Difference]: Start difference. First operand 9846 states and 15760 transitions. Second operand has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 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) [2021-11-03 04:16:48,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:48,962 INFO L93 Difference]: Finished difference Result 19458 states and 31177 transitions. [2021-11-03 04:16:48,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:16:48,963 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 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 130 [2021-11-03 04:16:48,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:48,987 INFO L225 Difference]: With dead ends: 19458 [2021-11-03 04:16:48,988 INFO L226 Difference]: Without dead ends: 9848 [2021-11-03 04:16:49,004 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:16:49,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-03 04:16:49,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9846. [2021-11-03 04:16:49,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.5973590655154901) internal successors, (15726), 9845 states have internal predecessors, (15726), 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) [2021-11-03 04:16:49,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15726 transitions. [2021-11-03 04:16:49,661 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15726 transitions. Word has length 130 [2021-11-03 04:16:49,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:49,665 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15726 transitions. [2021-11-03 04:16:49,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 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) [2021-11-03 04:16:49,666 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15726 transitions. [2021-11-03 04:16:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-03 04:16:49,667 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:49,668 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:49,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-03 04:16:49,668 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:49,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:49,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1885499437, now seen corresponding path program 1 times [2021-11-03 04:16:49,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:49,670 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990942028] [2021-11-03 04:16:49,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:49,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:49,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:49,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:49,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:49,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990942028] [2021-11-03 04:16:49,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990942028] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:49,760 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:49,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:16:49,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918668798] [2021-11-03 04:16:49,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:16:49,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:49,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:16:49,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:16:49,763 INFO L87 Difference]: Start difference. First operand 9846 states and 15726 transitions. Second operand has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 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) [2021-11-03 04:16:50,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:50,420 INFO L93 Difference]: Finished difference Result 19458 states and 31109 transitions. [2021-11-03 04:16:50,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:16:50,420 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 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 131 [2021-11-03 04:16:50,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:50,447 INFO L225 Difference]: With dead ends: 19458 [2021-11-03 04:16:50,448 INFO L226 Difference]: Without dead ends: 9848 [2021-11-03 04:16:50,467 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:16:50,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-03 04:16:51,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9846. [2021-11-03 04:16:51,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.5939055358049772) internal successors, (15692), 9845 states have internal predecessors, (15692), 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) [2021-11-03 04:16:51,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15692 transitions. [2021-11-03 04:16:51,236 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15692 transitions. Word has length 131 [2021-11-03 04:16:51,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:51,236 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15692 transitions. [2021-11-03 04:16:51,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 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) [2021-11-03 04:16:51,237 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15692 transitions. [2021-11-03 04:16:51,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-03 04:16:51,238 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:51,239 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:51,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-03 04:16:51,239 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:51,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:51,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1737005545, now seen corresponding path program 1 times [2021-11-03 04:16:51,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:51,240 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876093869] [2021-11-03 04:16:51,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:51,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:51,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:51,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:51,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:51,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876093869] [2021-11-03 04:16:51,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876093869] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:51,323 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:51,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:16:51,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413831267] [2021-11-03 04:16:51,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:16:51,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:51,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:16:51,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:16:51,325 INFO L87 Difference]: Start difference. First operand 9846 states and 15692 transitions. Second operand has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 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) [2021-11-03 04:16:51,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:51,943 INFO L93 Difference]: Finished difference Result 19458 states and 31041 transitions. [2021-11-03 04:16:51,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:16:51,944 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 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 132 [2021-11-03 04:16:51,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:51,969 INFO L225 Difference]: With dead ends: 19458 [2021-11-03 04:16:51,969 INFO L226 Difference]: Without dead ends: 9848 [2021-11-03 04:16:51,984 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:16:51,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-03 04:16:52,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9846. [2021-11-03 04:16:52,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.5904520060944642) internal successors, (15658), 9845 states have internal predecessors, (15658), 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) [2021-11-03 04:16:52,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15658 transitions. [2021-11-03 04:16:52,562 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15658 transitions. Word has length 132 [2021-11-03 04:16:52,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:52,563 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15658 transitions. [2021-11-03 04:16:52,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 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) [2021-11-03 04:16:52,563 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15658 transitions. [2021-11-03 04:16:52,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-03 04:16:52,565 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:52,565 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:52,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-03 04:16:52,566 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:52,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:52,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1934015028, now seen corresponding path program 1 times [2021-11-03 04:16:52,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:52,567 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112742495] [2021-11-03 04:16:52,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:52,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:52,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:52,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:52,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:52,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112742495] [2021-11-03 04:16:52,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112742495] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:52,721 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:52,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:16:52,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406814941] [2021-11-03 04:16:52,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:16:52,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:52,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:16:52,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:16:52,723 INFO L87 Difference]: Start difference. First operand 9846 states and 15658 transitions. Second operand has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 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) [2021-11-03 04:16:53,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:53,316 INFO L93 Difference]: Finished difference Result 19458 states and 30973 transitions. [2021-11-03 04:16:53,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:16:53,317 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 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 133 [2021-11-03 04:16:53,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:53,352 INFO L225 Difference]: With dead ends: 19458 [2021-11-03 04:16:53,352 INFO L226 Difference]: Without dead ends: 9848 [2021-11-03 04:16:53,367 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:16:53,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-03 04:16:53,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9846. [2021-11-03 04:16:53,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.5869984763839513) internal successors, (15624), 9845 states have internal predecessors, (15624), 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) [2021-11-03 04:16:54,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15624 transitions. [2021-11-03 04:16:54,008 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15624 transitions. Word has length 133 [2021-11-03 04:16:54,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:54,009 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15624 transitions. [2021-11-03 04:16:54,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 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) [2021-11-03 04:16:54,009 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15624 transitions. [2021-11-03 04:16:54,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-03 04:16:54,011 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:54,012 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:54,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-03 04:16:54,012 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:54,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:54,013 INFO L85 PathProgramCache]: Analyzing trace with hash 1645265701, now seen corresponding path program 1 times [2021-11-03 04:16:54,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:54,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251066530] [2021-11-03 04:16:54,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:54,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:54,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:54,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:54,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:54,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251066530] [2021-11-03 04:16:54,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251066530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:54,186 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:54,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 04:16:54,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971586670] [2021-11-03 04:16:54,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:16:54,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:54,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:16:54,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:16:54,188 INFO L87 Difference]: Start difference. First operand 9846 states and 15624 transitions. Second operand has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 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) [2021-11-03 04:16:55,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:55,060 INFO L93 Difference]: Finished difference Result 19458 states and 30905 transitions. [2021-11-03 04:16:55,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:16:55,061 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 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 135 [2021-11-03 04:16:55,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:55,090 INFO L225 Difference]: With dead ends: 19458 [2021-11-03 04:16:55,090 INFO L226 Difference]: Without dead ends: 9848 [2021-11-03 04:16:55,106 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:16:55,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-03 04:16:55,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9846. [2021-11-03 04:16:55,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9846 states, 9845 states have (on average 1.5853732859319452) internal successors, (15608), 9845 states have internal predecessors, (15608), 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) [2021-11-03 04:16:55,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9846 states to 9846 states and 15608 transitions. [2021-11-03 04:16:55,756 INFO L78 Accepts]: Start accepts. Automaton has 9846 states and 15608 transitions. Word has length 135 [2021-11-03 04:16:55,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:55,757 INFO L470 AbstractCegarLoop]: Abstraction has 9846 states and 15608 transitions. [2021-11-03 04:16:55,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 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) [2021-11-03 04:16:55,758 INFO L276 IsEmpty]: Start isEmpty. Operand 9846 states and 15608 transitions. [2021-11-03 04:16:55,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-03 04:16:55,759 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:55,760 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:55,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-03 04:16:55,760 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:55,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:55,761 INFO L85 PathProgramCache]: Analyzing trace with hash -2104616215, now seen corresponding path program 1 times [2021-11-03 04:16:55,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:55,761 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051666683] [2021-11-03 04:16:55,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:55,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:55,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:55,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:55,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051666683] [2021-11-03 04:16:55,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051666683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:55,941 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:55,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 04:16:55,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623335065] [2021-11-03 04:16:55,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:16:55,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:55,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:16:55,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:16:55,943 INFO L87 Difference]: Start difference. First operand 9846 states and 15608 transitions. Second operand has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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) [2021-11-03 04:16:56,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:56,813 INFO L93 Difference]: Finished difference Result 24527 states and 38817 transitions. [2021-11-03 04:16:56,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:16:56,813 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 138 [2021-11-03 04:16:56,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:56,842 INFO L225 Difference]: With dead ends: 24527 [2021-11-03 04:16:56,843 INFO L226 Difference]: Without dead ends: 14917 [2021-11-03 04:16:56,857 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:16:56,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14917 states. [2021-11-03 04:16:57,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14917 to 14915. [2021-11-03 04:16:57,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14915 states, 14914 states have (on average 1.5775781145232668) internal successors, (23528), 14914 states have internal predecessors, (23528), 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) [2021-11-03 04:16:57,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14915 states to 14915 states and 23528 transitions. [2021-11-03 04:16:57,654 INFO L78 Accepts]: Start accepts. Automaton has 14915 states and 23528 transitions. Word has length 138 [2021-11-03 04:16:57,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:57,654 INFO L470 AbstractCegarLoop]: Abstraction has 14915 states and 23528 transitions. [2021-11-03 04:16:57,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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) [2021-11-03 04:16:57,654 INFO L276 IsEmpty]: Start isEmpty. Operand 14915 states and 23528 transitions. [2021-11-03 04:16:57,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-03 04:16:57,656 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:57,656 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:57,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-03 04:16:57,657 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:57,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:57,658 INFO L85 PathProgramCache]: Analyzing trace with hash -784127491, now seen corresponding path program 1 times [2021-11-03 04:16:57,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:57,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041423038] [2021-11-03 04:16:57,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:57,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:57,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:57,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:16:57,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:57,883 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041423038] [2021-11-03 04:16:57,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041423038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:16:57,885 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:16:57,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 04:16:57,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771035792] [2021-11-03 04:16:57,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:16:57,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:16:57,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:16:57,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:16:57,887 INFO L87 Difference]: Start difference. First operand 14915 states and 23528 transitions. Second operand has 6 states, 6 states have (on average 23.166666666666668) internal successors, (139), 6 states have internal predecessors, (139), 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) [2021-11-03 04:16:58,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:16:58,819 INFO L93 Difference]: Finished difference Result 18223 states and 28636 transitions. [2021-11-03 04:16:58,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 04:16:58,820 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 23.166666666666668) internal successors, (139), 6 states have internal predecessors, (139), 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 139 [2021-11-03 04:16:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:16:58,853 INFO L225 Difference]: With dead ends: 18223 [2021-11-03 04:16:58,854 INFO L226 Difference]: Without dead ends: 18221 [2021-11-03 04:16:58,862 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-03 04:16:58,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18221 states. [2021-11-03 04:16:59,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18221 to 14929. [2021-11-03 04:16:59,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14929 states, 14928 states have (on average 1.5756966773847803) internal successors, (23522), 14928 states have internal predecessors, (23522), 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) [2021-11-03 04:16:59,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14929 states to 14929 states and 23522 transitions. [2021-11-03 04:16:59,741 INFO L78 Accepts]: Start accepts. Automaton has 14929 states and 23522 transitions. Word has length 139 [2021-11-03 04:16:59,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:16:59,742 INFO L470 AbstractCegarLoop]: Abstraction has 14929 states and 23522 transitions. [2021-11-03 04:16:59,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 23.166666666666668) internal successors, (139), 6 states have internal predecessors, (139), 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) [2021-11-03 04:16:59,742 INFO L276 IsEmpty]: Start isEmpty. Operand 14929 states and 23522 transitions. [2021-11-03 04:16:59,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-03 04:16:59,745 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:16:59,745 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:16:59,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-03 04:16:59,745 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:16:59,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:16:59,746 INFO L85 PathProgramCache]: Analyzing trace with hash -240446373, now seen corresponding path program 1 times [2021-11-03 04:16:59,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:16:59,747 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107987986] [2021-11-03 04:16:59,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:16:59,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:16:59,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:17:00,810 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:17:00,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:17:00,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107987986] [2021-11-03 04:17:00,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107987986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:17:00,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076315867] [2021-11-03 04:17:00,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:17:00,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:17:00,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:17:00,815 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:17:00,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:17:01,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:17:01,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 04:17:01,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:17:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-03 04:17:01,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:17:02,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-03 04:17:02,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076315867] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 04:17:02,039 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-03 04:17:02,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [17] total 20 [2021-11-03 04:17:02,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929221001] [2021-11-03 04:17:02,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:17:02,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:17:02,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:17:02,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2021-11-03 04:17:02,042 INFO L87 Difference]: Start difference. First operand 14929 states and 23522 transitions. Second operand has 5 states, 5 states have (on average 29.6) internal successors, (148), 4 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) [2021-11-03 04:17:03,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:17:03,947 INFO L93 Difference]: Finished difference Result 43831 states and 69035 transitions. [2021-11-03 04:17:03,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:17:03,948 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 29.6) internal successors, (148), 4 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 151 [2021-11-03 04:17:03,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:17:04,013 INFO L225 Difference]: With dead ends: 43831 [2021-11-03 04:17:04,014 INFO L226 Difference]: Without dead ends: 28911 [2021-11-03 04:17:04,040 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:17:04,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28911 states. [2021-11-03 04:17:05,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28911 to 28909. [2021-11-03 04:17:05,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28909 states, 28908 states have (on average 1.5681818181818181) internal successors, (45333), 28908 states have internal predecessors, (45333), 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) [2021-11-03 04:17:05,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28909 states to 28909 states and 45333 transitions. [2021-11-03 04:17:05,780 INFO L78 Accepts]: Start accepts. Automaton has 28909 states and 45333 transitions. Word has length 151 [2021-11-03 04:17:05,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:17:05,780 INFO L470 AbstractCegarLoop]: Abstraction has 28909 states and 45333 transitions. [2021-11-03 04:17:05,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 29.6) internal successors, (148), 4 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) [2021-11-03 04:17:05,781 INFO L276 IsEmpty]: Start isEmpty. Operand 28909 states and 45333 transitions. [2021-11-03 04:17:05,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-03 04:17:05,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:17:05,785 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:17:05,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-03 04:17:06,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548f67c1-80e5-4161-9264-c8b2f397e734/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:17:06,000 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:17:06,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:17:06,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1092139826, now seen corresponding path program 1 times [2021-11-03 04:17:06,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:17:06,001 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500043331] [2021-11-03 04:17:06,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:17:06,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:17:06,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:17:06,091 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-03 04:17:06,092 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:17:06,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500043331] [2021-11-03 04:17:06,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500043331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:17:06,093 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:17:06,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:17:06,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178099364] [2021-11-03 04:17:06,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:17:06,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:17:06,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:17:06,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:17:06,096 INFO L87 Difference]: Start difference. First operand 28909 states and 45333 transitions. Second operand has 3 states, 3 states have (on average 49.0) internal successors, (147), 3 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) [2021-11-03 04:17:08,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:17:08,063 INFO L93 Difference]: Finished difference Result 69276 states and 109228 transitions. [2021-11-03 04:17:08,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:17:08,064 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 3 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 152 [2021-11-03 04:17:08,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:17:08,129 INFO L225 Difference]: With dead ends: 69276 [2021-11-03 04:17:08,129 INFO L226 Difference]: Without dead ends: 40715 [2021-11-03 04:17:08,161 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:17:08,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40715 states. [2021-11-03 04:17:10,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40715 to 40713. [2021-11-03 04:17:10,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40713 states, 40712 states have (on average 1.5583366083709962) internal successors, (63443), 40712 states have internal predecessors, (63443), 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) [2021-11-03 04:17:10,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40713 states to 40713 states and 63443 transitions. [2021-11-03 04:17:10,747 INFO L78 Accepts]: Start accepts. Automaton has 40713 states and 63443 transitions. Word has length 152 [2021-11-03 04:17:10,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:17:10,748 INFO L470 AbstractCegarLoop]: Abstraction has 40713 states and 63443 transitions. [2021-11-03 04:17:10,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 3 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) [2021-11-03 04:17:10,748 INFO L276 IsEmpty]: Start isEmpty. Operand 40713 states and 63443 transitions. [2021-11-03 04:17:10,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-03 04:17:10,751 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:17:10,751 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:17:10,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-03 04:17:10,751 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:17:10,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:17:10,752 INFO L85 PathProgramCache]: Analyzing trace with hash 1714040683, now seen corresponding path program 1 times [2021-11-03 04:17:10,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:17:10,753 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487999549] [2021-11-03 04:17:10,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:17:10,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:17:10,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:17:10,836 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-03 04:17:10,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:17:10,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487999549] [2021-11-03 04:17:10,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487999549] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:17:10,837 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:17:10,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:17:10,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709207051] [2021-11-03 04:17:10,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:17:10,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:17:10,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:17:10,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:17:10,838 INFO L87 Difference]: Start difference. First operand 40713 states and 63443 transitions. Second operand has 3 states, 3 states have (on average 50.0) internal successors, (150), 3 states have internal predecessors, (150), 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) [2021-11-03 04:17:15,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:17:15,045 INFO L93 Difference]: Finished difference Result 120340 states and 187455 transitions. [2021-11-03 04:17:15,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:17:15,046 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.0) internal successors, (150), 3 states have internal predecessors, (150), 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 153 [2021-11-03 04:17:15,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:17:15,197 INFO L225 Difference]: With dead ends: 120340 [2021-11-03 04:17:15,197 INFO L226 Difference]: Without dead ends: 79748 [2021-11-03 04:17:15,240 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:17:15,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79748 states. [2021-11-03 04:17:19,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79748 to 79746. [2021-11-03 04:17:19,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79746 states, 79745 states have (on average 1.5532635274938869) internal successors, (123865), 79745 states have internal predecessors, (123865), 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) [2021-11-03 04:17:20,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79746 states to 79746 states and 123865 transitions. [2021-11-03 04:17:20,342 INFO L78 Accepts]: Start accepts. Automaton has 79746 states and 123865 transitions. Word has length 153 [2021-11-03 04:17:20,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:17:20,343 INFO L470 AbstractCegarLoop]: Abstraction has 79746 states and 123865 transitions. [2021-11-03 04:17:20,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.0) internal successors, (150), 3 states have internal predecessors, (150), 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) [2021-11-03 04:17:20,343 INFO L276 IsEmpty]: Start isEmpty. Operand 79746 states and 123865 transitions. [2021-11-03 04:17:20,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-03 04:17:20,346 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:17:20,347 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:17:20,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-03 04:17:20,347 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:17:20,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:17:20,348 INFO L85 PathProgramCache]: Analyzing trace with hash 606995942, now seen corresponding path program 1 times [2021-11-03 04:17:20,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:17:20,348 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675456] [2021-11-03 04:17:20,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:17:20,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:17:20,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:17:20,384 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-03 04:17:20,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:17:20,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675456] [2021-11-03 04:17:20,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675456] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:17:20,385 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:17:20,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:17:20,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703157168] [2021-11-03 04:17:20,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:17:20,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:17:20,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:17:20,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:17:20,386 INFO L87 Difference]: Start difference. First operand 79746 states and 123865 transitions. Second operand has 3 states, 3 states have (on average 49.0) internal successors, (147), 3 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)