./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 233676c1e8a1b5798ecf495818fb18bbff45b7aea47a9aff904b2f64a9e366a2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 05:18:22,849 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 05:18:22,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 05:18:22,903 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 05:18:22,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 05:18:22,908 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 05:18:22,910 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 05:18:22,913 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 05:18:22,915 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 05:18:22,921 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 05:18:22,922 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 05:18:22,924 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 05:18:22,924 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 05:18:22,927 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 05:18:22,929 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 05:18:22,934 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 05:18:22,935 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 05:18:22,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 05:18:22,938 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 05:18:22,940 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 05:18:22,942 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 05:18:22,944 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 05:18:22,946 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 05:18:22,946 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 05:18:22,950 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 05:18:22,950 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 05:18:22,951 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 05:18:22,952 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 05:18:22,952 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 05:18:22,953 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 05:18:22,954 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 05:18:22,955 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 05:18:22,955 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 05:18:22,956 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 05:18:22,957 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 05:18:22,958 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 05:18:22,958 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 05:18:22,958 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 05:18:22,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 05:18:22,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 05:18:22,960 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 05:18:22,961 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 05:18:22,986 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 05:18:22,987 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 05:18:22,988 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 05:18:22,988 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 05:18:22,988 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 05:18:22,988 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 05:18:22,988 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 05:18:22,989 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 05:18:22,989 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 05:18:22,989 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 05:18:22,989 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 05:18:22,989 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 05:18:22,990 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 05:18:22,990 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 05:18:22,990 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 05:18:22,991 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 05:18:22,991 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 05:18:22,991 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 05:18:22,991 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 05:18:22,992 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 05:18:22,992 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 05:18:22,992 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 05:18:22,992 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 05:18:22,992 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 05:18:22,993 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 05:18:22,993 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 05:18:22,993 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 05:18:22,993 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 05:18:22,993 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 05:18:22,994 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 05:18:22,994 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:18:22,994 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 05:18:22,994 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 05:18:22,995 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 05:18:22,995 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 05:18:22,995 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 05:18:22,995 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 05:18:22,995 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 05:18:22,996 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 05:18:22,996 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_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 233676c1e8a1b5798ecf495818fb18bbff45b7aea47a9aff904b2f64a9e366a2 [2021-11-03 05:18:23,263 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 05:18:23,297 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 05:18:23,299 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 05:18:23,300 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 05:18:23,301 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 05:18:23,302 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-03 05:18:23,373 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/data/2c384faa1/3ffb606cc8e94c6cb2a14f05b4d9b784/FLAG8aadf4aec [2021-11-03 05:18:23,907 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 05:18:23,915 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-03 05:18:23,930 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/data/2c384faa1/3ffb606cc8e94c6cb2a14f05b4d9b784/FLAG8aadf4aec [2021-11-03 05:18:24,227 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/data/2c384faa1/3ffb606cc8e94c6cb2a14f05b4d9b784 [2021-11-03 05:18:24,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 05:18:24,230 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 05:18:24,232 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 05:18:24,232 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 05:18:24,235 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 05:18:24,236 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,237 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76625399 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24, skipping insertion in model container [2021-11-03 05:18:24,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,244 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 05:18:24,280 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 05:18:24,540 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6876,6889] [2021-11-03 05:18:24,555 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9071,9084] [2021-11-03 05:18:24,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:18:24,586 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 05:18:24,667 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6876,6889] [2021-11-03 05:18:24,678 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9071,9084] [2021-11-03 05:18:24,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:18:24,707 INFO L208 MainTranslator]: Completed translation [2021-11-03 05:18:24,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24 WrapperNode [2021-11-03 05:18:24,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 05:18:24,708 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 05:18:24,709 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 05:18:24,709 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 05:18:24,716 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,737 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,792 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 05:18:24,793 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 05:18:24,793 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 05:18:24,793 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 05:18:24,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,806 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,806 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,835 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,838 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,842 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 05:18:24,843 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 05:18:24,844 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 05:18:24,844 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 05:18:24,845 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (1/1) ... [2021-11-03 05:18:24,854 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:18:24,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:18:24,878 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 05:18:24,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 05:18:24,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 05:18:24,919 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 05:18:24,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 05:18:24,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 05:18:25,981 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 05:18:25,982 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 05:18:25,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:18:25 BoogieIcfgContainer [2021-11-03 05:18:25,985 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 05:18:25,988 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 05:18:25,988 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 05:18:25,991 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 05:18:25,992 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 05:18:24" (1/3) ... [2021-11-03 05:18:25,992 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3274554b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:18:25, skipping insertion in model container [2021-11-03 05:18:25,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:18:24" (2/3) ... [2021-11-03 05:18:25,993 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3274554b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:18:25, skipping insertion in model container [2021-11-03 05:18:25,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:18:25" (3/3) ... [2021-11-03 05:18:25,995 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-03 05:18:26,001 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 05:18:26,002 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-03 05:18:26,041 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 05:18:26,046 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-03 05:18:26,046 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-03 05:18:26,061 INFO L276 IsEmpty]: Start isEmpty. Operand has 77 states, 74 states have (on average 1.7567567567567568) internal successors, (130), 76 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:18:26,067 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:26,068 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:26,069 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:26,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:26,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1843482918, now seen corresponding path program 1 times [2021-11-03 05:18:26,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:26,083 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087663821] [2021-11-03 05:18:26,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:26,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:26,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:26,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:26,395 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:26,395 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087663821] [2021-11-03 05:18:26,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087663821] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:26,396 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:26,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:18:26,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660755239] [2021-11-03 05:18:26,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:18:26,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:26,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:18:26,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:18:26,417 INFO L87 Difference]: Start difference. First operand has 77 states, 74 states have (on average 1.7567567567567568) internal successors, (130), 76 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 8.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:26,534 INFO L93 Difference]: Finished difference Result 129 states and 207 transitions. [2021-11-03 05:18:26,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:18:26,536 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-03 05:18:26,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:26,544 INFO L225 Difference]: With dead ends: 129 [2021-11-03 05:18:26,544 INFO L226 Difference]: Without dead ends: 75 [2021-11-03 05:18:26,547 INFO L786 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 [2021-11-03 05:18:26,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-03 05:18:26,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-03 05:18:26,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 74 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2021-11-03 05:18:26,581 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 40 [2021-11-03 05:18:26,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:26,581 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2021-11-03 05:18:26,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,582 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2021-11-03 05:18:26,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-03 05:18:26,583 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:26,583 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:26,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 05:18:26,584 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:26,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:26,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1440898121, now seen corresponding path program 1 times [2021-11-03 05:18:26,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:26,585 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839963339] [2021-11-03 05:18:26,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:26,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:26,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:26,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:26,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:26,710 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839963339] [2021-11-03 05:18:26,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839963339] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:26,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:26,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:18:26,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764667387] [2021-11-03 05:18:26,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:18:26,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:26,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:18:26,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:18:26,714 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:26,788 INFO L93 Difference]: Finished difference Result 125 states and 151 transitions. [2021-11-03 05:18:26,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:18:26,789 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 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 41 [2021-11-03 05:18:26,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:26,790 INFO L225 Difference]: With dead ends: 125 [2021-11-03 05:18:26,790 INFO L226 Difference]: Without dead ends: 75 [2021-11-03 05:18:26,791 INFO L786 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 [2021-11-03 05:18:26,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-03 05:18:26,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-03 05:18:26,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 74 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2021-11-03 05:18:26,801 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 41 [2021-11-03 05:18:26,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:26,802 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2021-11-03 05:18:26,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:26,802 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2021-11-03 05:18:26,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-03 05:18:26,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:26,804 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:26,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 05:18:26,804 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:26,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:26,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1754500562, now seen corresponding path program 1 times [2021-11-03 05:18:26,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:26,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922651085] [2021-11-03 05:18:26,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:26,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:26,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:26,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:26,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:26,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922651085] [2021-11-03 05:18:26,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922651085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:26,913 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:26,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:18:26,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738915869] [2021-11-03 05:18:26,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:18:26,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:26,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:18:26,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:18:26,916 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 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) [2021-11-03 05:18:27,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:27,042 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2021-11-03 05:18:27,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:18:27,043 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 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 [2021-11-03 05:18:27,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:27,046 INFO L225 Difference]: With dead ends: 129 [2021-11-03 05:18:27,046 INFO L226 Difference]: Without dead ends: 75 [2021-11-03 05:18:27,047 INFO L786 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 [2021-11-03 05:18:27,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-03 05:18:27,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-03 05:18:27,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 73 states have (on average 1.178082191780822) internal successors, (86), 74 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:27,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 86 transitions. [2021-11-03 05:18:27,064 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 86 transitions. Word has length 42 [2021-11-03 05:18:27,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:27,065 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 86 transitions. [2021-11-03 05:18:27,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 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) [2021-11-03 05:18:27,066 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 86 transitions. [2021-11-03 05:18:27,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-03 05:18:27,068 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:27,068 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:27,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 05:18:27,069 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:27,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:27,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1141763107, now seen corresponding path program 1 times [2021-11-03 05:18:27,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:27,072 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120651932] [2021-11-03 05:18:27,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:27,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:27,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:29,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:29,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:29,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120651932] [2021-11-03 05:18:29,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120651932] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:29,290 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:29,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-11-03 05:18:29,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143617471] [2021-11-03 05:18:29,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-03 05:18:29,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:29,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-03 05:18:29,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-03 05:18:29,293 INFO L87 Difference]: Start difference. First operand 75 states and 86 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:31,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:31,430 INFO L93 Difference]: Finished difference Result 128 states and 157 transitions. [2021-11-03 05:18:31,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-03 05:18:31,431 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-03 05:18:31,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:31,432 INFO L225 Difference]: With dead ends: 128 [2021-11-03 05:18:31,432 INFO L226 Difference]: Without dead ends: 100 [2021-11-03 05:18:31,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=319, Invalid=941, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 05:18:31,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-03 05:18:31,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2021-11-03 05:18:31,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 96 states have (on average 1.2083333333333333) internal successors, (116), 97 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:31,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 116 transitions. [2021-11-03 05:18:31,448 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 116 transitions. Word has length 43 [2021-11-03 05:18:31,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:31,449 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 116 transitions. [2021-11-03 05:18:31,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:31,449 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 116 transitions. [2021-11-03 05:18:31,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-03 05:18:31,450 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:31,451 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:31,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 05:18:31,451 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:31,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:31,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1211477989, now seen corresponding path program 1 times [2021-11-03 05:18:31,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:31,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660996593] [2021-11-03 05:18:31,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:31,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:31,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:34,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:34,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:34,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660996593] [2021-11-03 05:18:34,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660996593] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:34,496 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:34,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-11-03 05:18:34,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106882859] [2021-11-03 05:18:34,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 05:18:34,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:34,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 05:18:34,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2021-11-03 05:18:34,499 INFO L87 Difference]: Start difference. First operand 98 states and 116 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:38,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:38,907 INFO L93 Difference]: Finished difference Result 256 states and 328 transitions. [2021-11-03 05:18:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-03 05:18:38,908 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 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 44 [2021-11-03 05:18:38,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:38,911 INFO L225 Difference]: With dead ends: 256 [2021-11-03 05:18:38,911 INFO L226 Difference]: Without dead ends: 202 [2021-11-03 05:18:38,912 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=485, Invalid=1321, Unknown=0, NotChecked=0, Total=1806 [2021-11-03 05:18:38,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-03 05:18:38,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 121. [2021-11-03 05:18:38,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.2333333333333334) internal successors, (148), 120 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:38,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 148 transitions. [2021-11-03 05:18:38,960 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 148 transitions. Word has length 44 [2021-11-03 05:18:38,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:38,961 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 148 transitions. [2021-11-03 05:18:38,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:38,962 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 148 transitions. [2021-11-03 05:18:38,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:18:38,969 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:38,970 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:38,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 05:18:38,971 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:38,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:38,971 INFO L85 PathProgramCache]: Analyzing trace with hash 251889645, now seen corresponding path program 1 times [2021-11-03 05:18:38,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:38,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457996238] [2021-11-03 05:18:38,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:38,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:39,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:39,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:39,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:39,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457996238] [2021-11-03 05:18:39,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457996238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:39,068 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:39,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:18:39,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994090760] [2021-11-03 05:18:39,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:18:39,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:39,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:18:39,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,076 INFO L87 Difference]: Start difference. First operand 121 states and 148 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:39,104 INFO L93 Difference]: Finished difference Result 245 states and 317 transitions. [2021-11-03 05:18:39,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:18:39,105 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 56 [2021-11-03 05:18:39,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:39,108 INFO L225 Difference]: With dead ends: 245 [2021-11-03 05:18:39,108 INFO L226 Difference]: Without dead ends: 168 [2021-11-03 05:18:39,112 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-03 05:18:39,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-03 05:18:39,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.2483660130718954) internal successors, (191), 153 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 191 transitions. [2021-11-03 05:18:39,147 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 191 transitions. Word has length 56 [2021-11-03 05:18:39,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:39,148 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 191 transitions. [2021-11-03 05:18:39,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,149 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 191 transitions. [2021-11-03 05:18:39,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-03 05:18:39,151 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:39,151 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:39,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 05:18:39,152 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:39,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:39,153 INFO L85 PathProgramCache]: Analyzing trace with hash 555047994, now seen corresponding path program 1 times [2021-11-03 05:18:39,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:39,157 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451052801] [2021-11-03 05:18:39,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:39,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:39,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:39,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:39,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:39,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451052801] [2021-11-03 05:18:39,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451052801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:39,223 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:39,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:18:39,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712773598] [2021-11-03 05:18:39,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:18:39,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:39,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:18:39,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,225 INFO L87 Difference]: Start difference. First operand 154 states and 191 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:39,259 INFO L93 Difference]: Finished difference Result 356 states and 462 transitions. [2021-11-03 05:18:39,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:18:39,259 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 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 59 [2021-11-03 05:18:39,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:39,261 INFO L225 Difference]: With dead ends: 356 [2021-11-03 05:18:39,262 INFO L226 Difference]: Without dead ends: 246 [2021-11-03 05:18:39,263 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-03 05:18:39,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 228. [2021-11-03 05:18:39,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 227 states have (on average 1.277533039647577) internal successors, (290), 227 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 290 transitions. [2021-11-03 05:18:39,294 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 290 transitions. Word has length 59 [2021-11-03 05:18:39,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:39,294 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 290 transitions. [2021-11-03 05:18:39,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,295 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 290 transitions. [2021-11-03 05:18:39,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-03 05:18:39,297 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:39,298 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:39,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 05:18:39,299 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:39,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:39,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1093058742, now seen corresponding path program 1 times [2021-11-03 05:18:39,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:39,300 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11077215] [2021-11-03 05:18:39,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:39,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:39,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:39,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:39,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:39,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11077215] [2021-11-03 05:18:39,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11077215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:39,363 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:39,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:18:39,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769601132] [2021-11-03 05:18:39,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:18:39,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:39,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:18:39,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,365 INFO L87 Difference]: Start difference. First operand 228 states and 290 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:39,424 INFO L93 Difference]: Finished difference Result 590 states and 775 transitions. [2021-11-03 05:18:39,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:18:39,424 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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 62 [2021-11-03 05:18:39,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:39,427 INFO L225 Difference]: With dead ends: 590 [2021-11-03 05:18:39,428 INFO L226 Difference]: Without dead ends: 406 [2021-11-03 05:18:39,428 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-03 05:18:39,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 380. [2021-11-03 05:18:39,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 379 states have (on average 1.2981530343007917) internal successors, (492), 379 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 492 transitions. [2021-11-03 05:18:39,478 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 492 transitions. Word has length 62 [2021-11-03 05:18:39,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:39,479 INFO L470 AbstractCegarLoop]: Abstraction has 380 states and 492 transitions. [2021-11-03 05:18:39,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,480 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 492 transitions. [2021-11-03 05:18:39,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-03 05:18:39,480 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:39,481 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:39,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 05:18:39,481 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:39,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:39,481 INFO L85 PathProgramCache]: Analyzing trace with hash -407352996, now seen corresponding path program 1 times [2021-11-03 05:18:39,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:39,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553003866] [2021-11-03 05:18:39,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:39,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:39,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:39,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:39,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:39,551 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553003866] [2021-11-03 05:18:39,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553003866] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:39,551 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:39,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:18:39,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195052200] [2021-11-03 05:18:39,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:18:39,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:39,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:18:39,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,553 INFO L87 Difference]: Start difference. First operand 380 states and 492 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:39,641 INFO L93 Difference]: Finished difference Result 880 states and 1161 transitions. [2021-11-03 05:18:39,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:18:39,642 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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 67 [2021-11-03 05:18:39,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:39,646 INFO L225 Difference]: With dead ends: 880 [2021-11-03 05:18:39,646 INFO L226 Difference]: Without dead ends: 544 [2021-11-03 05:18:39,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:18:39,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-11-03 05:18:39,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 542. [2021-11-03 05:18:39,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 541 states have (on average 1.3068391866913125) internal successors, (707), 541 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 707 transitions. [2021-11-03 05:18:39,723 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 707 transitions. Word has length 67 [2021-11-03 05:18:39,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:39,723 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 707 transitions. [2021-11-03 05:18:39,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:39,723 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 707 transitions. [2021-11-03 05:18:39,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-03 05:18:39,724 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:39,724 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:39,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-03 05:18:39,726 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:39,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:39,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1283144301, now seen corresponding path program 1 times [2021-11-03 05:18:39,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:39,727 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741710504] [2021-11-03 05:18:39,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:39,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:39,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:39,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:39,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:39,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741710504] [2021-11-03 05:18:39,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741710504] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:39,837 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:39,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-03 05:18:39,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799255474] [2021-11-03 05:18:39,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-03 05:18:39,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:39,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-03 05:18:39,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:18:39,839 INFO L87 Difference]: Start difference. First operand 542 states and 707 transitions. Second operand has 7 states, 7 states have (on average 9.714285714285714) internal successors, (68), 7 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:40,083 INFO L93 Difference]: Finished difference Result 702 states and 897 transitions. [2021-11-03 05:18:40,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-03 05:18:40,083 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.714285714285714) internal successors, (68), 7 states have internal predecessors, (68), 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 68 [2021-11-03 05:18:40,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:40,088 INFO L225 Difference]: With dead ends: 702 [2021-11-03 05:18:40,088 INFO L226 Difference]: Without dead ends: 700 [2021-11-03 05:18:40,088 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-03 05:18:40,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-11-03 05:18:40,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 542. [2021-11-03 05:18:40,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 541 states have (on average 1.2920517560073936) internal successors, (699), 541 states have internal predecessors, (699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 699 transitions. [2021-11-03 05:18:40,166 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 699 transitions. Word has length 68 [2021-11-03 05:18:40,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:40,167 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 699 transitions. [2021-11-03 05:18:40,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.714285714285714) internal successors, (68), 7 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,167 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 699 transitions. [2021-11-03 05:18:40,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-03 05:18:40,171 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:40,171 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:40,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-03 05:18:40,173 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:40,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:40,173 INFO L85 PathProgramCache]: Analyzing trace with hash -719784973, now seen corresponding path program 1 times [2021-11-03 05:18:40,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:40,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702868504] [2021-11-03 05:18:40,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:40,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:40,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:40,407 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-03 05:18:40,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:40,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702868504] [2021-11-03 05:18:40,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702868504] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:18:40,408 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:18:40,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-03 05:18:40,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388842756] [2021-11-03 05:18:40,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:18:40,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:18:40,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:18:40,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-03 05:18:40,410 INFO L87 Difference]: Start difference. First operand 542 states and 699 transitions. Second operand has 8 states, 8 states have (on average 9.25) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:18:40,569 INFO L93 Difference]: Finished difference Result 1040 states and 1354 transitions. [2021-11-03 05:18:40,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:18:40,570 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.25) internal successors, (74), 7 states have internal predecessors, (74), 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 79 [2021-11-03 05:18:40,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:18:40,573 INFO L225 Difference]: With dead ends: 1040 [2021-11-03 05:18:40,574 INFO L226 Difference]: Without dead ends: 542 [2021-11-03 05:18:40,575 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-03 05:18:40,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-11-03 05:18:40,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 542. [2021-11-03 05:18:40,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 541 states have (on average 1.255083179297597) internal successors, (679), 541 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 679 transitions. [2021-11-03 05:18:40,664 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 679 transitions. Word has length 79 [2021-11-03 05:18:40,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:18:40,664 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 679 transitions. [2021-11-03 05:18:40,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.25) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:18:40,664 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 679 transitions. [2021-11-03 05:18:40,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-03 05:18:40,665 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:18:40,666 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:18:40,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-03 05:18:40,666 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:18:40,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:18:40,667 INFO L85 PathProgramCache]: Analyzing trace with hash 1001545902, now seen corresponding path program 1 times [2021-11-03 05:18:40,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:18:40,667 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449001163] [2021-11-03 05:18:40,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:40,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:18:40,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:45,765 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:18:45,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:18:45,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449001163] [2021-11-03 05:18:45,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449001163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:18:45,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672328473] [2021-11-03 05:18:45,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:18:45,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:18:45,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:18:45,767 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:18:45,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f14fe6fe-50e8-4b5a-b559-7930e494e861/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 05:18:46,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:18:46,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-03 05:18:46,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:19:03,596 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:19:03,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:22:07,378 WARN L207 SmtUtils]: Spent 5.09 s on a formula simplification. DAG size of input: 693 DAG size of output: 685 [2021-11-03 05:28:09,352 WARN L207 SmtUtils]: Spent 19.20 s on a formula simplification. DAG size of input: 1271 DAG size of output: 1241