./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9315395d0a8f14500c92b8c06710daa9c3f1878481e9b5bb1bf2cb8cc368eb3d --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:50:04,968 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:50:04,970 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:50:05,020 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:50:05,021 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:50:05,024 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:50:05,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:50:05,030 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:50:05,033 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:50:05,041 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:50:05,042 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:50:05,044 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:50:05,044 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:50:05,047 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:50:05,050 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:50:05,054 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:50:05,055 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:50:05,056 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:50:05,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:50:05,066 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:50:05,068 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:50:05,069 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:50:05,072 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:50:05,073 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:50:05,082 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:50:05,083 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:50:05,083 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:50:05,085 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:50:05,086 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:50:05,088 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:50:05,089 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:50:05,089 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:50:05,091 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:50:05,093 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:50:05,094 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:50:05,094 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:50:05,095 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:50:05,095 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:50:05,096 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:50:05,096 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:50:05,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:50:05,099 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:50:05,141 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:50:05,144 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:50:05,145 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:50:05,146 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:50:05,147 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:50:05,148 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:50:05,148 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:50:05,148 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:50:05,148 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:50:05,149 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:50:05,149 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:50:05,149 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:50:05,149 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:50:05,150 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:50:05,150 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:50:05,150 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:50:05,150 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:50:05,151 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:50:05,153 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:50:05,153 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:50:05,154 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:50:05,154 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:50:05,154 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:50:05,155 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:50:05,156 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:50:05,157 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:50:05,159 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:50:05,159 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:50:05,159 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:50:05,160 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:50:05,160 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:50:05,161 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:50:05,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:50:05,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:50:05,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:50:05,163 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:50:05,164 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:50:05,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:50:05,164 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:50:05,164 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:50:05,165 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:50:05,165 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_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9315395d0a8f14500c92b8c06710daa9c3f1878481e9b5bb1bf2cb8cc368eb3d [2021-11-25 17:50:05,423 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:50:05,446 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:50:05,448 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:50:05,450 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:50:05,450 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:50:05,452 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 17:50:05,519 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/data/a95add34e/2105e0381bbf4bfdbe57da2fcd0c6b11/FLAGeb9825615 [2021-11-25 17:50:05,968 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:50:05,969 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 17:50:05,979 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/data/a95add34e/2105e0381bbf4bfdbe57da2fcd0c6b11/FLAGeb9825615 [2021-11-25 17:50:06,320 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/data/a95add34e/2105e0381bbf4bfdbe57da2fcd0c6b11 [2021-11-25 17:50:06,322 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:50:06,324 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:50:06,325 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:50:06,326 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:50:06,330 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:50:06,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,331 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c6635f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06, skipping insertion in model container [2021-11-25 17:50:06,332 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,338 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:50:06,380 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:50:06,634 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c[14373,14386] [2021-11-25 17:50:06,637 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:50:06,647 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:50:06,724 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c[14373,14386] [2021-11-25 17:50:06,724 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:50:06,753 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:50:06,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06 WrapperNode [2021-11-25 17:50:06,754 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:50:06,755 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:50:06,756 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:50:06,756 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:50:06,761 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,771 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,818 INFO L137 Inliner]: procedures = 22, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 479 [2021-11-25 17:50:06,818 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:50:06,819 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:50:06,819 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:50:06,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:50:06,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,843 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,843 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,854 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,863 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,867 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,873 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:50:06,874 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:50:06,875 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:50:06,875 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:50:06,876 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (1/1) ... [2021-11-25 17:50:06,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:50:06,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:06,927 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:50:06,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:50:06,973 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:50:06,973 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:50:06,973 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:50:06,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:50:07,064 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:50:07,066 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:50:07,653 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:50:08,277 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:50:08,277 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 17:50:08,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:50:08 BoogieIcfgContainer [2021-11-25 17:50:08,280 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:50:08,282 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:50:08,282 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:50:08,285 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:50:08,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:50:06" (1/3) ... [2021-11-25 17:50:08,287 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2085f288 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:50:08, skipping insertion in model container [2021-11-25 17:50:08,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:06" (2/3) ... [2021-11-25 17:50:08,288 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2085f288 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:50:08, skipping insertion in model container [2021-11-25 17:50:08,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:50:08" (3/3) ... [2021-11-25 17:50:08,290 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 17:50:08,299 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:50:08,300 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:50:08,363 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:50:08,374 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:50:08,374 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:50:08,389 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 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) [2021-11-25 17:50:08,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 17:50:08,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:08,395 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 17:50:08,396 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:08,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:08,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1407348247, now seen corresponding path program 1 times [2021-11-25 17:50:08,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:08,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254972631] [2021-11-25 17:50:08,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:08,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:08,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:08,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:08,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:08,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254972631] [2021-11-25 17:50:08,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254972631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:08,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:08,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:08,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547644753] [2021-11-25 17:50:08,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:08,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:08,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:08,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:08,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:08,992 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 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 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-25 17:50:09,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:09,115 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2021-11-25 17:50:09,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:09,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2021-11-25 17:50:09,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:09,127 INFO L225 Difference]: With dead ends: 57 [2021-11-25 17:50:09,127 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:50:09,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,133 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 26 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:09,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 38 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:09,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:50:09,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2021-11-25 17:50:09,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 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) [2021-11-25 17:50:09,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 41 transitions. [2021-11-25 17:50:09,168 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 41 transitions. Word has length 6 [2021-11-25 17:50:09,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:09,169 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 41 transitions. [2021-11-25 17:50:09,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-25 17:50:09,169 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 41 transitions. [2021-11-25 17:50:09,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 17:50:09,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:09,170 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:09,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:50:09,171 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:09,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:09,171 INFO L85 PathProgramCache]: Analyzing trace with hash 615488199, now seen corresponding path program 1 times [2021-11-25 17:50:09,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:09,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550177096] [2021-11-25 17:50:09,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:09,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:09,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:09,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:09,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:09,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550177096] [2021-11-25 17:50:09,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550177096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:09,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:09,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:09,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370863937] [2021-11-25 17:50:09,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:09,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:09,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:09,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:09,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,377 INFO L87 Difference]: Start difference. First operand 26 states and 41 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2021-11-25 17:50:09,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:09,478 INFO L93 Difference]: Finished difference Result 57 states and 87 transitions. [2021-11-25 17:50:09,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:09,479 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 7 [2021-11-25 17:50:09,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:09,481 INFO L225 Difference]: With dead ends: 57 [2021-11-25 17:50:09,481 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 17:50:09,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,490 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:09,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:09,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 17:50:09,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-25 17:50:09,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 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) [2021-11-25 17:50:09,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 40 transitions. [2021-11-25 17:50:09,508 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 40 transitions. Word has length 7 [2021-11-25 17:50:09,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:09,509 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 40 transitions. [2021-11-25 17:50:09,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2021-11-25 17:50:09,509 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 40 transitions. [2021-11-25 17:50:09,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 17:50:09,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:09,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:09,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:50:09,511 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:09,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:09,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1843082240, now seen corresponding path program 1 times [2021-11-25 17:50:09,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:09,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321652610] [2021-11-25 17:50:09,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:09,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:09,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:09,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:09,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:09,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321652610] [2021-11-25 17:50:09,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321652610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:09,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:09,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:09,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062846427] [2021-11-25 17:50:09,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:09,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:09,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:09,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:09,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,602 INFO L87 Difference]: Start difference. First operand 26 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-11-25 17:50:09,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:09,676 INFO L93 Difference]: Finished difference Result 57 states and 86 transitions. [2021-11-25 17:50:09,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:09,676 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 8 [2021-11-25 17:50:09,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:09,677 INFO L225 Difference]: With dead ends: 57 [2021-11-25 17:50:09,677 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 17:50:09,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,679 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:09,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 44 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:09,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 17:50:09,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-25 17:50:09,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 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) [2021-11-25 17:50:09,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 39 transitions. [2021-11-25 17:50:09,686 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 39 transitions. Word has length 8 [2021-11-25 17:50:09,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:09,686 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 39 transitions. [2021-11-25 17:50:09,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-11-25 17:50:09,687 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 39 transitions. [2021-11-25 17:50:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 17:50:09,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:09,688 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:09,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:50:09,688 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:09,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:09,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1249243600, now seen corresponding path program 1 times [2021-11-25 17:50:09,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:09,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812248359] [2021-11-25 17:50:09,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:09,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:09,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:09,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:09,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:09,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812248359] [2021-11-25 17:50:09,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812248359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:09,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:09,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:09,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776845427] [2021-11-25 17:50:09,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:09,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:09,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:09,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:09,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,776 INFO L87 Difference]: Start difference. First operand 26 states and 39 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-11-25 17:50:09,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:09,846 INFO L93 Difference]: Finished difference Result 57 states and 85 transitions. [2021-11-25 17:50:09,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:09,847 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 9 [2021-11-25 17:50:09,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:09,848 INFO L225 Difference]: With dead ends: 57 [2021-11-25 17:50:09,848 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 17:50:09,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:09,850 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:09,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:09,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 17:50:09,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-25 17:50:09,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 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) [2021-11-25 17:50:09,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-25 17:50:09,856 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 9 [2021-11-25 17:50:09,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:09,857 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-25 17:50:09,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-11-25 17:50:09,857 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-25 17:50:09,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 17:50:09,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:09,858 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:09,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:50:09,859 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:09,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:09,859 INFO L85 PathProgramCache]: Analyzing trace with hash 753676536, now seen corresponding path program 1 times [2021-11-25 17:50:09,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:09,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397676144] [2021-11-25 17:50:09,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:09,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:09,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:10,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:10,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:10,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397676144] [2021-11-25 17:50:10,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397676144] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:10,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:10,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:10,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942346075] [2021-11-25 17:50:10,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:10,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:10,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:10,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:10,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,022 INFO L87 Difference]: Start difference. First operand 26 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-11-25 17:50:10,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:10,112 INFO L93 Difference]: Finished difference Result 55 states and 81 transitions. [2021-11-25 17:50:10,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:10,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 11 [2021-11-25 17:50:10,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:10,114 INFO L225 Difference]: With dead ends: 55 [2021-11-25 17:50:10,114 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:50:10,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,116 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:10,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:10,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:50:10,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 17:50:10,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 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) [2021-11-25 17:50:10,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2021-11-25 17:50:10,122 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2021-11-25 17:50:10,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:10,123 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2021-11-25 17:50:10,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-11-25 17:50:10,123 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2021-11-25 17:50:10,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 17:50:10,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:10,124 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:10,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:50:10,125 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:10,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:10,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1801209079, now seen corresponding path program 1 times [2021-11-25 17:50:10,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:10,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215596804] [2021-11-25 17:50:10,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:10,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:10,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:10,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:10,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215596804] [2021-11-25 17:50:10,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215596804] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:10,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:10,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:10,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318399657] [2021-11-25 17:50:10,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:10,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:10,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:10,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:10,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,211 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-11-25 17:50:10,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:10,276 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2021-11-25 17:50:10,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:10,277 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 12 [2021-11-25 17:50:10,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:10,278 INFO L225 Difference]: With dead ends: 56 [2021-11-25 17:50:10,278 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 17:50:10,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,280 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:10,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:10,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 17:50:10,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2021-11-25 17:50:10,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 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) [2021-11-25 17:50:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2021-11-25 17:50:10,286 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 12 [2021-11-25 17:50:10,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:10,287 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2021-11-25 17:50:10,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-11-25 17:50:10,287 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2021-11-25 17:50:10,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 17:50:10,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:10,288 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:10,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 17:50:10,289 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:10,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:10,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1603892381, now seen corresponding path program 1 times [2021-11-25 17:50:10,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:10,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760754949] [2021-11-25 17:50:10,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:10,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:10,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:10,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:10,432 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:10,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760754949] [2021-11-25 17:50:10,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760754949] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:10,433 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:10,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:50:10,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976599954] [2021-11-25 17:50:10,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:10,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:10,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:10,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:10,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,435 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-11-25 17:50:10,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:10,499 INFO L93 Difference]: Finished difference Result 56 states and 79 transitions. [2021-11-25 17:50:10,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:10,500 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-11-25 17:50:10,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:10,500 INFO L225 Difference]: With dead ends: 56 [2021-11-25 17:50:10,500 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 17:50:10,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:10,502 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:10,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 45 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:10,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 17:50:10,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-25 17:50:10,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 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) [2021-11-25 17:50:10,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-25 17:50:10,508 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 14 [2021-11-25 17:50:10,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:10,508 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-25 17:50:10,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-11-25 17:50:10,509 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-25 17:50:10,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 17:50:10,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:10,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:10,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 17:50:10,510 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:10,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:10,511 INFO L85 PathProgramCache]: Analyzing trace with hash -1831231449, now seen corresponding path program 1 times [2021-11-25 17:50:10,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:10,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048749242] [2021-11-25 17:50:10,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:10,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:10,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:10,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:10,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:10,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048749242] [2021-11-25 17:50:10,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048749242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:10,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:10,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:50:10,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070199793] [2021-11-25 17:50:10,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:10,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:50:10,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:10,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:50:10,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:50:10,607 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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) [2021-11-25 17:50:10,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:10,742 INFO L93 Difference]: Finished difference Result 77 states and 113 transitions. [2021-11-25 17:50:10,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:50:10,743 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 15 [2021-11-25 17:50:10,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:10,743 INFO L225 Difference]: With dead ends: 77 [2021-11-25 17:50:10,744 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 17:50:10,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:50:10,745 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 41 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:10,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 98 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:10,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 17:50:10,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2021-11-25 17:50:10,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 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) [2021-11-25 17:50:10,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-25 17:50:10,755 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2021-11-25 17:50:10,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:10,761 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-25 17:50:10,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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) [2021-11-25 17:50:10,762 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-25 17:50:10,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 17:50:10,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:10,763 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:10,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 17:50:10,763 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:10,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:10,764 INFO L85 PathProgramCache]: Analyzing trace with hash -699595510, now seen corresponding path program 1 times [2021-11-25 17:50:10,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:10,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273738971] [2021-11-25 17:50:10,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:10,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:10,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:11,553 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:11,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:11,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273738971] [2021-11-25 17:50:11,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273738971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:11,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122113934] [2021-11-25 17:50:11,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:11,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:11,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:11,557 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:11,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4efe615-f435-42c0-900f-852ccd333f89/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:50:11,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:11,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 17:50:11,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:27,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:50:27,201 INFO L328 TraceCheckSpWp]: Computing backward predicates...