./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V --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 ccd7de77f49c6b9ff6e2bd62edbddc630c5186aa67a4c3123f05914f38eca6d7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:41:17,818 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:41:17,820 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:41:17,860 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:41:17,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:41:17,862 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:41:17,864 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:41:17,867 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:41:17,869 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:41:17,870 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:41:17,871 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:41:17,873 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:41:17,873 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:41:17,881 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:41:17,882 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:41:17,884 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:41:17,885 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:41:17,886 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:41:17,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:41:17,891 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:41:17,892 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:41:17,896 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:41:17,898 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:41:17,899 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:41:17,902 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:41:17,903 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:41:17,903 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:41:17,904 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:41:17,904 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:41:17,906 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:41:17,906 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:41:17,907 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:41:17,908 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:41:17,914 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:41:17,916 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:41:17,916 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:41:17,917 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:41:17,917 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:41:17,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:41:17,918 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:41:17,918 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:41:17,920 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:41:17,967 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:41:17,970 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:41:17,971 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:41:17,971 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:41:17,978 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:41:17,979 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:41:17,979 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:41:17,980 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:41:17,980 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:41:17,980 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:41:17,981 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:41:17,981 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:41:17,981 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:41:17,982 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:41:17,982 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:41:17,982 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:41:17,982 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:41:17,983 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:41:17,983 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:41:17,984 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:41:17,985 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:41:17,985 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:41:17,985 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:41:17,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:41:17,986 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:41:17,986 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:41:17,988 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:41:17,988 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:41:17,988 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:41:17,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:41:17,989 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:41:17,989 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:41:17,990 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:41:17,990 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:41:17,990 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:41:17,990 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:41:17,990 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:41:17,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:41:17,991 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:41:17,991 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:41:17,991 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:41:17,992 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_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ccd7de77f49c6b9ff6e2bd62edbddc630c5186aa67a4c3123f05914f38eca6d7 [2021-11-23 03:41:18,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:41:18,327 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:41:18,329 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:41:18,331 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:41:18,331 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:41:18,333 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 03:41:18,395 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/data/6c67acfe2/d6eb93a684bd418dbe62542bb8f0ec17/FLAGeff2300c0 [2021-11-23 03:41:18,848 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:41:18,849 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 03:41:18,859 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/data/6c67acfe2/d6eb93a684bd418dbe62542bb8f0ec17/FLAGeff2300c0 [2021-11-23 03:41:19,212 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/data/6c67acfe2/d6eb93a684bd418dbe62542bb8f0ec17 [2021-11-23 03:41:19,214 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:41:19,215 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:41:19,222 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:41:19,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:41:19,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:41:19,227 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,230 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36ad948b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19, skipping insertion in model container [2021-11-23 03:41:19,230 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,237 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:41:19,280 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:41:19,506 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_502e82a8-6b27-4f3c-be9c-1cece70f4172/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[5377,5390] [2021-11-23 03:41:19,553 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:41:19,574 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:41:19,615 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_502e82a8-6b27-4f3c-be9c-1cece70f4172/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[5377,5390] [2021-11-23 03:41:19,633 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:41:19,651 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:41:19,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19 WrapperNode [2021-11-23 03:41:19,652 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:41:19,653 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:41:19,653 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:41:19,654 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:41:19,670 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,682 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,724 INFO L137 Inliner]: procedures = 24, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 410 [2021-11-23 03:41:19,725 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:41:19,726 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:41:19,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:41:19,726 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:41:19,733 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,733 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,737 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,737 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,746 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,755 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,760 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:41:19,761 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:41:19,761 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:41:19,761 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:41:19,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (1/1) ... [2021-11-23 03:41:19,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:41:19,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:19,799 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:41:19,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:41:19,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:41:19,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:41:19,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:41:19,845 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:41:19,967 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:41:19,969 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:41:20,360 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:41:20,588 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:41:20,588 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 03:41:20,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:41:20 BoogieIcfgContainer [2021-11-23 03:41:20,593 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:41:20,595 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:41:20,595 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:41:20,598 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:41:20,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:41:19" (1/3) ... [2021-11-23 03:41:20,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cc0989f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:41:20, skipping insertion in model container [2021-11-23 03:41:20,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:41:19" (2/3) ... [2021-11-23 03:41:20,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cc0989f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:41:20, skipping insertion in model container [2021-11-23 03:41:20,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:41:20" (3/3) ... [2021-11-23 03:41:20,602 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 03:41:20,607 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:41:20,607 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:41:20,659 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:41:20,670 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 [2021-11-23 03:41:20,670 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:41:20,688 INFO L276 IsEmpty]: Start isEmpty. Operand has 79 states, 77 states have (on average 1.6753246753246753) internal successors, (129), 78 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) [2021-11-23 03:41:20,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:41:20,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:20,704 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:20,705 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:20,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:20,710 INFO L85 PathProgramCache]: Analyzing trace with hash 441311359, now seen corresponding path program 1 times [2021-11-23 03:41:20,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:20,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509328388] [2021-11-23 03:41:20,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:20,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:20,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:21,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:21,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:21,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509328388] [2021-11-23 03:41:21,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509328388] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:21,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:21,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:21,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005864977] [2021-11-23 03:41:21,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:21,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:21,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:21,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:21,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,042 INFO L87 Difference]: Start difference. First operand has 79 states, 77 states have (on average 1.6753246753246753) internal successors, (129), 78 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) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2021-11-23 03:41:21,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:21,123 INFO L93 Difference]: Finished difference Result 179 states and 276 transitions. [2021-11-23 03:41:21,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:21,126 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 37 [2021-11-23 03:41:21,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:21,135 INFO L225 Difference]: With dead ends: 179 [2021-11-23 03:41:21,135 INFO L226 Difference]: Without dead ends: 122 [2021-11-23 03:41:21,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,142 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 93 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:21,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 251 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:41:21,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-23 03:41:21,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2021-11-23 03:41:21,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.403361344537815) internal successors, (167), 119 states have internal predecessors, (167), 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) [2021-11-23 03:41:21,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 167 transitions. [2021-11-23 03:41:21,192 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 167 transitions. Word has length 37 [2021-11-23 03:41:21,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:21,193 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 167 transitions. [2021-11-23 03:41:21,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2021-11-23 03:41:21,193 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 167 transitions. [2021-11-23 03:41:21,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 03:41:21,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:21,195 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:21,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:41:21,196 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:21,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:21,197 INFO L85 PathProgramCache]: Analyzing trace with hash -494108447, now seen corresponding path program 1 times [2021-11-23 03:41:21,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:21,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220421977] [2021-11-23 03:41:21,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:21,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:21,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:21,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:21,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220421977] [2021-11-23 03:41:21,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220421977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:21,327 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:21,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:21,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114312359] [2021-11-23 03:41:21,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:21,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:21,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:21,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:21,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,331 INFO L87 Difference]: Start difference. First operand 120 states and 167 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) [2021-11-23 03:41:21,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:21,429 INFO L93 Difference]: Finished difference Result 286 states and 415 transitions. [2021-11-23 03:41:21,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:21,430 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) Word has length 39 [2021-11-23 03:41:21,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:21,433 INFO L225 Difference]: With dead ends: 286 [2021-11-23 03:41:21,433 INFO L226 Difference]: Without dead ends: 192 [2021-11-23 03:41:21,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,436 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 69 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:21,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 198 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:21,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-23 03:41:21,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2021-11-23 03:41:21,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.433862433862434) internal successors, (271), 189 states have internal predecessors, (271), 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) [2021-11-23 03:41:21,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 271 transitions. [2021-11-23 03:41:21,476 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 271 transitions. Word has length 39 [2021-11-23 03:41:21,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:21,477 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 271 transitions. [2021-11-23 03:41:21,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) [2021-11-23 03:41:21,477 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 271 transitions. [2021-11-23 03:41:21,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 03:41:21,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:21,479 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:21,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:41:21,480 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:21,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:21,480 INFO L85 PathProgramCache]: Analyzing trace with hash -398853529, now seen corresponding path program 1 times [2021-11-23 03:41:21,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:21,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615231176] [2021-11-23 03:41:21,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:21,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:21,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:21,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:21,583 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:21,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615231176] [2021-11-23 03:41:21,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615231176] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:21,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:21,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:21,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625100428] [2021-11-23 03:41:21,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:21,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:21,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:21,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:21,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,586 INFO L87 Difference]: Start difference. First operand 190 states and 271 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2021-11-23 03:41:21,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:21,681 INFO L93 Difference]: Finished difference Result 474 states and 693 transitions. [2021-11-23 03:41:21,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:21,684 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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 42 [2021-11-23 03:41:21,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:21,688 INFO L225 Difference]: With dead ends: 474 [2021-11-23 03:41:21,693 INFO L226 Difference]: Without dead ends: 310 [2021-11-23 03:41:21,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,697 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 64 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:21,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 183 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:21,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-23 03:41:21,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 308. [2021-11-23 03:41:21,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 1.4429967426710097) internal successors, (443), 307 states have internal predecessors, (443), 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) [2021-11-23 03:41:21,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 443 transitions. [2021-11-23 03:41:21,766 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 443 transitions. Word has length 42 [2021-11-23 03:41:21,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:21,767 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 443 transitions. [2021-11-23 03:41:21,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2021-11-23 03:41:21,769 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 443 transitions. [2021-11-23 03:41:21,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 03:41:21,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:21,772 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:21,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:41:21,773 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:21,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:21,774 INFO L85 PathProgramCache]: Analyzing trace with hash 920420636, now seen corresponding path program 1 times [2021-11-23 03:41:21,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:21,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176282911] [2021-11-23 03:41:21,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:21,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:21,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:21,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:21,886 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:21,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176282911] [2021-11-23 03:41:21,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176282911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:21,886 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:21,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:21,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453636705] [2021-11-23 03:41:21,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:21,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:21,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:21,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:21,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:21,889 INFO L87 Difference]: Start difference. First operand 308 states and 443 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 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) [2021-11-23 03:41:21,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:21,988 INFO L93 Difference]: Finished difference Result 784 states and 1141 transitions. [2021-11-23 03:41:21,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:21,990 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 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 45 [2021-11-23 03:41:21,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:21,995 INFO L225 Difference]: With dead ends: 784 [2021-11-23 03:41:21,996 INFO L226 Difference]: Without dead ends: 502 [2021-11-23 03:41:21,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:22,010 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 59 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:22,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 168 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:22,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-23 03:41:22,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 500. [2021-11-23 03:41:22,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 1.4328657314629258) internal successors, (715), 499 states have internal predecessors, (715), 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) [2021-11-23 03:41:22,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 715 transitions. [2021-11-23 03:41:22,080 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 715 transitions. Word has length 45 [2021-11-23 03:41:22,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:22,081 INFO L470 AbstractCegarLoop]: Abstraction has 500 states and 715 transitions. [2021-11-23 03:41:22,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 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) [2021-11-23 03:41:22,082 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 715 transitions. [2021-11-23 03:41:22,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:41:22,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:22,086 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:22,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:41:22,087 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:22,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:22,090 INFO L85 PathProgramCache]: Analyzing trace with hash 14304989, now seen corresponding path program 1 times [2021-11-23 03:41:22,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:22,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065825062] [2021-11-23 03:41:22,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:22,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:22,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:22,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:22,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:22,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065825062] [2021-11-23 03:41:22,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065825062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:22,264 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:22,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:41:22,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557330844] [2021-11-23 03:41:22,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:22,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:41:22,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:22,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:41:22,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:41:22,268 INFO L87 Difference]: Start difference. First operand 500 states and 715 transitions. Second operand has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 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) [2021-11-23 03:41:22,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:22,560 INFO L93 Difference]: Finished difference Result 2084 states and 2991 transitions. [2021-11-23 03:41:22,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:41:22,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 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 48 [2021-11-23 03:41:22,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:22,572 INFO L225 Difference]: With dead ends: 2084 [2021-11-23 03:41:22,572 INFO L226 Difference]: Without dead ends: 1610 [2021-11-23 03:41:22,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:41:22,580 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 292 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:22,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [292 Valid, 382 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:22,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1610 states. [2021-11-23 03:41:22,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1610 to 1604. [2021-11-23 03:41:22,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1604 states, 1603 states have (on average 1.429195258889582) internal successors, (2291), 1603 states have internal predecessors, (2291), 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) [2021-11-23 03:41:22,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1604 states to 1604 states and 2291 transitions. [2021-11-23 03:41:22,780 INFO L78 Accepts]: Start accepts. Automaton has 1604 states and 2291 transitions. Word has length 48 [2021-11-23 03:41:22,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:22,784 INFO L470 AbstractCegarLoop]: Abstraction has 1604 states and 2291 transitions. [2021-11-23 03:41:22,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 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) [2021-11-23 03:41:22,784 INFO L276 IsEmpty]: Start isEmpty. Operand 1604 states and 2291 transitions. [2021-11-23 03:41:22,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:41:22,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:22,796 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:22,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:41:22,797 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:22,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:22,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1209515284, now seen corresponding path program 1 times [2021-11-23 03:41:22,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:22,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738313632] [2021-11-23 03:41:22,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:22,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:22,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:22,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:22,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:22,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738313632] [2021-11-23 03:41:22,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738313632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:22,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:22,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:41:22,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459860414] [2021-11-23 03:41:22,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:22,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:41:22,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:22,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:41:22,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:41:22,880 INFO L87 Difference]: Start difference. First operand 1604 states and 2291 transitions. Second operand has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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) [2021-11-23 03:41:23,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:23,300 INFO L93 Difference]: Finished difference Result 4125 states and 5937 transitions. [2021-11-23 03:41:23,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:41:23,300 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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 50 [2021-11-23 03:41:23,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:23,317 INFO L225 Difference]: With dead ends: 4125 [2021-11-23 03:41:23,317 INFO L226 Difference]: Without dead ends: 2547 [2021-11-23 03:41:23,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:23,322 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 396 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:23,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [396 Valid, 108 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:23,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2547 states. [2021-11-23 03:41:23,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2547 to 2545. [2021-11-23 03:41:23,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2545 states, 2544 states have (on average 1.4241352201257862) internal successors, (3623), 2544 states have internal predecessors, (3623), 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) [2021-11-23 03:41:23,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2545 states to 2545 states and 3623 transitions. [2021-11-23 03:41:23,601 INFO L78 Accepts]: Start accepts. Automaton has 2545 states and 3623 transitions. Word has length 50 [2021-11-23 03:41:23,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:23,602 INFO L470 AbstractCegarLoop]: Abstraction has 2545 states and 3623 transitions. [2021-11-23 03:41:23,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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) [2021-11-23 03:41:23,602 INFO L276 IsEmpty]: Start isEmpty. Operand 2545 states and 3623 transitions. [2021-11-23 03:41:23,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:41:23,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:23,603 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:23,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:41:23,604 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:23,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:23,605 INFO L85 PathProgramCache]: Analyzing trace with hash 585664527, now seen corresponding path program 1 times [2021-11-23 03:41:23,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:23,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274586954] [2021-11-23 03:41:23,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:23,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:23,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:23,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:23,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:23,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274586954] [2021-11-23 03:41:23,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274586954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:23,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:23,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 03:41:23,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759122598] [2021-11-23 03:41:23,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:23,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:41:23,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:23,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:41:23,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:41:23,825 INFO L87 Difference]: Start difference. First operand 2545 states and 3623 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 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) [2021-11-23 03:41:24,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:24,608 INFO L93 Difference]: Finished difference Result 5460 states and 7845 transitions. [2021-11-23 03:41:24,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:41:24,609 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 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 50 [2021-11-23 03:41:24,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:24,642 INFO L225 Difference]: With dead ends: 5460 [2021-11-23 03:41:24,642 INFO L226 Difference]: Without dead ends: 5458 [2021-11-23 03:41:24,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:41:24,646 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 843 mSDsluCounter, 844 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 843 SdHoareTripleChecker+Valid, 1110 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:24,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [843 Valid, 1110 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:24,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5458 states. [2021-11-23 03:41:25,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5458 to 2761. [2021-11-23 03:41:25,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2761 states, 2760 states have (on average 1.4246376811594204) internal successors, (3932), 2760 states have internal predecessors, (3932), 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) [2021-11-23 03:41:25,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2761 states to 2761 states and 3932 transitions. [2021-11-23 03:41:25,026 INFO L78 Accepts]: Start accepts. Automaton has 2761 states and 3932 transitions. Word has length 50 [2021-11-23 03:41:25,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:25,028 INFO L470 AbstractCegarLoop]: Abstraction has 2761 states and 3932 transitions. [2021-11-23 03:41:25,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 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) [2021-11-23 03:41:25,028 INFO L276 IsEmpty]: Start isEmpty. Operand 2761 states and 3932 transitions. [2021-11-23 03:41:25,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:41:25,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:25,031 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:41:25,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:41:25,032 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:25,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:25,033 INFO L85 PathProgramCache]: Analyzing trace with hash -145352785, now seen corresponding path program 1 times [2021-11-23 03:41:25,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:25,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762870619] [2021-11-23 03:41:25,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:25,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:25,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:25,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:25,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762870619] [2021-11-23 03:41:25,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762870619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:25,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923434699] [2021-11-23 03:41:25,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:25,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:25,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:25,741 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:25,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:41:25,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:25,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 03:41:25,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:28,067 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:28,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:41:37,514 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:41:37,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923434699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:41:37,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191734540] [2021-11-23 03:41:37,531 INFO L159 IcfgInterpreter]: Started Sifa with 51 locations of interest [2021-11-23 03:41:37,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:41:37,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:41:37,556 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:41:37,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:41:37,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:41:37,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 12 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-23 03:41:37,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:41:37,902 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:41:37,930 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:41:37,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-23 03:42:18,007 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:42:39,648 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35027#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= (+ |ULTIMATE.start_main_~node4__m4~0#1| 1) 0) (= ~p4~0 0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 ~mode4~0) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 ~send4~0) (<= 0 (+ ~p1_old~0 1)) (<= ~id4~0 127) (<= 0 (+ |ULTIMATE.start_main_~node4__m4~0#1| 1)) (<= 1 ~__return_10566~0) (<= 0 ~id1~0) (<= 0 (+ ~p4_old~0 1)) (<= 0 ~st4~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= |ULTIMATE.start_main_~node2____CPAchecker_TMP_0~0#1| 127) (<= ~send1~0 127) (<= ~st1~0 0) (<= ~send4~0 127) (<= 0 (+ ~p3_old~0 1)) (<= 0 ~st1~0) (<= (+ ~p4_old~0 1) 0) (<= 0 ~st2~0) (<= ~__return_10566~0 1) (<= 0 ~send2~0) (<= 0 (+ |ULTIMATE.start_main_~node1__m1~0#1| 1)) (<= ~mode4~0 1) (<= ~id1~0 127) (<= (+ ~p3_old~0 1) 0) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (<= ~send2~0 127) (= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ |ULTIMATE.start_main_~node1__m1~0#1| 1) 0) (<= (+ ~nomsg~0 1) 0) (<= ~st2~0 0) (<= (+ ~p2_new~0 1) 0) (<= ~st4~0 0) (<= 0 |ULTIMATE.start_main_~node2____CPAchecker_TMP_0~0#1|) (<= 0 ~__return_10692~0) (<= 0 ~id4~0) (<= 0 (+ ~p4_new~0 1)) (<= ~__return_10692~0 1) (<= (+ ~p4_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= 0 (+ |ULTIMATE.start_main_~node2__m2~0#1| 1)) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= (+ ~p1_old~0 1) 0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~send1~0) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (<= (+ |ULTIMATE.start_main_~node2__m2~0#1| 1) 0) (= ~__return_main~0 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (= |#NULL.base| 0) (= |ULTIMATE.start_main_~main__i2~0#1| 0))' at error location [2021-11-23 03:42:39,648 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:42:39,648 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:42:39,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 44 [2021-11-23 03:42:39,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159725034] [2021-11-23 03:42:39,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:42:39,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 03:42:39,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:39,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 03:42:39,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1146, Invalid=7226, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 03:42:39,653 INFO L87 Difference]: Start difference. First operand 2761 states and 3932 transitions. Second operand has 44 states, 44 states have (on average 3.840909090909091) internal successors, (169), 44 states have internal predecessors, (169), 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) [2021-11-23 03:44:37,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:37,085 INFO L93 Difference]: Finished difference Result 68162 states and 97367 transitions. [2021-11-23 03:44:37,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 390 states. [2021-11-23 03:44:37,086 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.840909090909091) internal successors, (169), 44 states have internal predecessors, (169), 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 60 [2021-11-23 03:44:37,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:37,383 INFO L225 Difference]: With dead ends: 68162 [2021-11-23 03:44:37,384 INFO L226 Difference]: Without dead ends: 65448 [2021-11-23 03:44:37,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 472 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103148 ImplicationChecksByTransitivity, 117.3s TimeCoverageRelationStatistics Valid=32026, Invalid=192176, Unknown=0, NotChecked=0, Total=224202 [2021-11-23 03:44:37,456 INFO L933 BasicCegarLoop]: 293 mSDtfsCounter, 11370 mSDsluCounter, 7394 mSDsCounter, 0 mSdLazyCounter, 9417 mSolverCounterSat, 807 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11370 SdHoareTripleChecker+Valid, 7675 SdHoareTripleChecker+Invalid, 10224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 807 IncrementalHoareTripleChecker+Valid, 9417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:37,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11370 Valid, 7675 Invalid, 10224 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [807 Valid, 9417 Invalid, 0 Unknown, 0 Unchecked, 12.1s Time] [2021-11-23 03:44:37,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65448 states. [2021-11-23 03:44:42,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65448 to 23430. [2021-11-23 03:44:42,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23430 states, 23429 states have (on average 1.4006573050492979) internal successors, (32816), 23429 states have internal predecessors, (32816), 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) [2021-11-23 03:44:43,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23430 states to 23430 states and 32816 transitions. [2021-11-23 03:44:43,027 INFO L78 Accepts]: Start accepts. Automaton has 23430 states and 32816 transitions. Word has length 60 [2021-11-23 03:44:43,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:43,028 INFO L470 AbstractCegarLoop]: Abstraction has 23430 states and 32816 transitions. [2021-11-23 03:44:43,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.840909090909091) internal successors, (169), 44 states have internal predecessors, (169), 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) [2021-11-23 03:44:43,029 INFO L276 IsEmpty]: Start isEmpty. Operand 23430 states and 32816 transitions. [2021-11-23 03:44:43,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:44:43,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:43,032 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:44:43,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:44:43,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:43,248 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:43,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:43,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1293871622, now seen corresponding path program 1 times [2021-11-23 03:44:43,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:43,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74336715] [2021-11-23 03:44:43,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:43,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:43,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:43,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:44:43,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:43,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74336715] [2021-11-23 03:44:43,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74336715] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:43,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:43,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:43,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525646498] [2021-11-23 03:44:43,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:43,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:44:43,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:43,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:44:43,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:44:43,349 INFO L87 Difference]: Start difference. First operand 23430 states and 32816 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 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) [2021-11-23 03:44:49,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:49,127 INFO L93 Difference]: Finished difference Result 57378 states and 80815 transitions. [2021-11-23 03:44:49,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:49,127 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 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 60 [2021-11-23 03:44:49,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:49,210 INFO L225 Difference]: With dead ends: 57378 [2021-11-23 03:44:49,210 INFO L226 Difference]: Without dead ends: 34189 [2021-11-23 03:44:49,255 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:44:49,258 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 375 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 375 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:49,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [375 Valid, 118 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:49,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34189 states. [2021-11-23 03:44:55,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34189 to 34187. [2021-11-23 03:44:55,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34187 states, 34186 states have (on average 1.398233194875095) internal successors, (47800), 34186 states have internal predecessors, (47800), 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) [2021-11-23 03:44:55,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34187 states to 34187 states and 47800 transitions. [2021-11-23 03:44:55,414 INFO L78 Accepts]: Start accepts. Automaton has 34187 states and 47800 transitions. Word has length 60 [2021-11-23 03:44:55,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:55,414 INFO L470 AbstractCegarLoop]: Abstraction has 34187 states and 47800 transitions. [2021-11-23 03:44:55,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 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) [2021-11-23 03:44:55,414 INFO L276 IsEmpty]: Start isEmpty. Operand 34187 states and 47800 transitions. [2021-11-23 03:44:55,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:44:55,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:55,417 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:44:55,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:44:55,418 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:55,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:55,418 INFO L85 PathProgramCache]: Analyzing trace with hash 327992299, now seen corresponding path program 1 times [2021-11-23 03:44:55,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:55,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713355972] [2021-11-23 03:44:55,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:55,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:55,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:55,877 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:44:55,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:55,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713355972] [2021-11-23 03:44:55,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713355972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:44:55,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810305054] [2021-11-23 03:44:55,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:55,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:55,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:44:55,878 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:44:55,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_502e82a8-6b27-4f3c-be9c-1cece70f4172/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:44:55,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:55,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 03:44:55,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:44:57,600 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:44:57,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:45:07,245 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:45:07,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810305054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:45:07,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1661475787] [2021-11-23 03:45:07,249 INFO L159 IcfgInterpreter]: Started Sifa with 51 locations of interest [2021-11-23 03:45:07,249 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:45:07,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:45:07,250 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:45:07,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:45:07,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:45:07,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:45:07,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:45:07,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-23 03:45:07,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:45:07,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 12 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-23 03:45:50,422 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:46:12,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '332261#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= ~send3~0 127) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (= ~p4~0 0) (<= ~st3~0 0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 ~mode4~0) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 (+ ~p1_old~0 1)) (<= ~id4~0 127) (<= 1 ~__return_10566~0) (<= 0 ~id1~0) (<= 0 (+ ~p4_old~0 1)) (<= 0 ~st4~0) (<= 0 (+ |ULTIMATE.start_main_~node3__m3~0#1| 1)) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= ~send1~0 127) (<= ~st1~0 0) (<= 0 |ULTIMATE.start_main_~node3____CPAchecker_TMP_0~0#1|) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= (+ ~p4_old~0 1) 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= ~__return_10566~0 1) (<= 0 ~send2~0) (<= 0 (+ |ULTIMATE.start_main_~node1__m1~0#1| 1)) (<= ~mode4~0 1) (<= 0 (+ ~p2_old~0 1)) (<= ~id1~0 127) (<= |ULTIMATE.start_main_~node3____CPAchecker_TMP_0~0#1| 127) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (<= ~send2~0 127) (= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ |ULTIMATE.start_main_~node1__m1~0#1| 1) 0) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= ~st2~0 0) (<= (+ ~p2_new~0 1) 0) (<= 0 ~__return_10692~0) (<= 0 ~id4~0) (<= 0 (+ ~p4_new~0 1)) (<= ~__return_10692~0 1) (<= (+ ~p4_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= 0 (+ |ULTIMATE.start_main_~node2__m2~0#1| 1)) (= ~p3~0 0) (<= (+ ~p2_old~0 1) 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= (+ ~p1_old~0 1) 0) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~send1~0) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (<= (+ |ULTIMATE.start_main_~node2__m2~0#1| 1) 0) (= ~__return_main~0 0) (<= (+ |ULTIMATE.start_main_~node3__m3~0#1| 1) 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (= |#NULL.base| 0) (= |ULTIMATE.start_main_~main__i2~0#1| 0))' at error location [2021-11-23 03:46:12,989 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:46:12,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:46:12,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 44 [2021-11-23 03:46:12,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023208078] [2021-11-23 03:46:12,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:46:12,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 03:46:12,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:46:12,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 03:46:12,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1156, Invalid=7216, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 03:46:12,992 INFO L87 Difference]: Start difference. First operand 34187 states and 47800 transitions. Second operand has 44 states, 44 states have (on average 3.840909090909091) internal successors, (169), 44 states have internal predecessors, (169), 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) [2021-11-23 03:48:04,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:48:04,504 INFO L93 Difference]: Finished difference Result 195465 states and 273049 transitions. [2021-11-23 03:48:04,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 300 states. [2021-11-23 03:48:04,505 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.840909090909091) internal successors, (169), 44 states have internal predecessors, (169), 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 60 [2021-11-23 03:48:04,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:48:05,165 INFO L225 Difference]: With dead ends: 195465 [2021-11-23 03:48:05,166 INFO L226 Difference]: Without dead ends: 156439 [2021-11-23 03:48:05,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66374 ImplicationChecksByTransitivity, 93.1s TimeCoverageRelationStatistics Valid=19488, Invalid=127584, Unknown=0, NotChecked=0, Total=147072 [2021-11-23 03:48:05,257 INFO L933 BasicCegarLoop]: 304 mSDtfsCounter, 11646 mSDsluCounter, 6718 mSDsCounter, 0 mSdLazyCounter, 8720 mSolverCounterSat, 903 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11646 SdHoareTripleChecker+Valid, 7010 SdHoareTripleChecker+Invalid, 9623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 903 IncrementalHoareTripleChecker+Valid, 8720 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:48:05,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11646 Valid, 7010 Invalid, 9623 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [903 Valid, 8720 Invalid, 0 Unknown, 0 Unchecked, 10.5s Time] [2021-11-23 03:48:05,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156439 states.