./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8099d26797381b80337a430cbea65f80d24d8bb2ab20ef5e1337fe6b0f67d890 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:26:20,797 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:26:20,801 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:26:20,860 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:26:20,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:26:20,865 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:26:20,867 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:26:20,871 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:26:20,874 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:26:20,880 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:26:20,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:26:20,883 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:26:20,884 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:26:20,886 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:26:20,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:26:20,896 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:26:20,898 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:26:20,899 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:26:20,902 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:26:20,909 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:26:20,911 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:26:20,913 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:26:20,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:26:20,917 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:26:20,926 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:26:20,927 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:26:20,927 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:26:20,929 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:26:20,930 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:26:20,932 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:26:20,932 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:26:20,933 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:26:20,935 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:26:20,937 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:26:20,939 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:26:20,939 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:26:20,940 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:26:20,941 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:26:20,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:26:20,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:26:20,943 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:26:20,944 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:26:20,993 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:26:20,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:26:20,994 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:26:20,994 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:26:20,995 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:26:21,001 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:26:21,002 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:26:21,002 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:26:21,002 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:26:21,002 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:26:21,003 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:26:21,004 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:26:21,004 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:26:21,004 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:26:21,005 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:26:21,005 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:26:21,005 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:26:21,005 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:26:21,006 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:26:21,006 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:26:21,007 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:26:21,007 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:26:21,007 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:26:21,007 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:26:21,008 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:26:21,008 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:26:21,009 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:26:21,010 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:26:21,010 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:26:21,010 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:26:21,011 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:26:21,011 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:26:21,011 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:21,011 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:26:21,012 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:26:21,012 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:26:21,012 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:26:21,012 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:26:21,013 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:26:21,013 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:26:21,013 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:26:21,013 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_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8099d26797381b80337a430cbea65f80d24d8bb2ab20ef5e1337fe6b0f67d890 [2021-11-23 02:26:21,309 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:26:21,333 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:26:21,338 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:26:21,339 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:26:21,340 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:26:21,341 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c [2021-11-23 02:26:21,418 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/data/65381561c/a643a6ac2d2244aebd5e9d42b1e63acb/FLAGad43ae4cf [2021-11-23 02:26:22,480 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:26:22,481 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c [2021-11-23 02:26:22,541 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/data/65381561c/a643a6ac2d2244aebd5e9d42b1e63acb/FLAGad43ae4cf [2021-11-23 02:26:22,793 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/data/65381561c/a643a6ac2d2244aebd5e9d42b1e63acb [2021-11-23 02:26:22,794 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:26:22,796 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:26:22,800 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:22,800 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:26:22,804 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:26:22,805 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:22" (1/1) ... [2021-11-23 02:26:22,806 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63c33bde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:22, skipping insertion in model container [2021-11-23 02:26:22,807 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:22" (1/1) ... [2021-11-23 02:26:22,814 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:26:23,075 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:26:25,567 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c[380593,380606] [2021-11-23 02:26:25,603 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c[383339,383352] [2021-11-23 02:26:25,867 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:25,877 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:26:27,122 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c[380593,380606] [2021-11-23 02:26:27,139 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/sv-benchmarks/c/combinations/Problem05_label49+token_ring.06.cil-2.c[383339,383352] [2021-11-23 02:26:27,159 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:27,239 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:26:27,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27 WrapperNode [2021-11-23 02:26:27,240 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:27,241 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:27,241 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:26:27,241 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:26:27,249 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:27,343 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:27,866 INFO L137 Inliner]: procedures = 56, calls = 59, calls flagged for inlining = 34, calls inlined = 34, statements flattened = 12851 [2021-11-23 02:26:27,867 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:27,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:26:27,867 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:26:27,867 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:26:27,876 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:27,877 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:27,949 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:27,950 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:28,138 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:28,188 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:28,209 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:28,267 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:26:28,269 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:26:28,269 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:26:28,269 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:26:28,270 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (1/1) ... [2021-11-23 02:26:28,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:28,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:28,306 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:26:28,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:26:28,352 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:26:28,353 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 02:26:28,353 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 02:26:28,353 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:26:28,353 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:26:28,353 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 02:26:28,354 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 02:26:28,354 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 02:26:28,354 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 02:26:28,354 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 02:26:28,354 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 02:26:28,355 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 02:26:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 02:26:28,355 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:26:28,355 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:26:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:26:28,593 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:26:28,595 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:26:36,025 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:26:38,194 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:26:38,194 INFO L301 CfgBuilder]: Removed 10 assume(true) statements. [2021-11-23 02:26:38,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:38 BoogieIcfgContainer [2021-11-23 02:26:38,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:26:38,203 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:26:38,203 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:26:38,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:26:38,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:26:22" (1/3) ... [2021-11-23 02:26:38,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17f04c30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:38, skipping insertion in model container [2021-11-23 02:26:38,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:27" (2/3) ... [2021-11-23 02:26:38,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17f04c30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:38, skipping insertion in model container [2021-11-23 02:26:38,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:38" (3/3) ... [2021-11-23 02:26:38,209 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.06.cil-2.c [2021-11-23 02:26:38,215 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:26:38,215 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:26:38,271 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:26:38,278 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:26:38,278 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:26:38,330 INFO L276 IsEmpty]: Start isEmpty. Operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 02:26:38,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:26:38,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:38,339 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:38,340 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:38,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:38,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1360974215, now seen corresponding path program 1 times [2021-11-23 02:26:38,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:38,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843464389] [2021-11-23 02:26:38,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:38,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:38,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:38,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:38,739 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:38,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843464389] [2021-11-23 02:26:38,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843464389] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:38,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:38,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:26:38,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950633174] [2021-11-23 02:26:38,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:38,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:26:38,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:38,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:26:38,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:38,805 INFO L87 Difference]: Start difference. First operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:26:39,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:39,761 INFO L93 Difference]: Finished difference Result 3635 states and 7091 transitions. [2021-11-23 02:26:39,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:26:39,764 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2021-11-23 02:26:39,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:39,800 INFO L225 Difference]: With dead ends: 3635 [2021-11-23 02:26:39,801 INFO L226 Difference]: Without dead ends: 1869 [2021-11-23 02:26:39,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:39,818 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 3581 mSDsluCounter, 3529 mSDsCounter, 0 mSdLazyCounter, 630 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3581 SdHoareTripleChecker+Valid, 6588 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:39,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3581 Valid, 6588 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 630 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:26:39,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1869 states. [2021-11-23 02:26:39,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1869 to 1868. [2021-11-23 02:26:39,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1868 states, 1818 states have (on average 1.9405940594059405) internal successors, (3528), 1821 states have internal predecessors, (3528), 36 states have call successors, (36), 12 states have call predecessors, (36), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 02:26:39,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1868 states to 1868 states and 3600 transitions. [2021-11-23 02:26:40,001 INFO L78 Accepts]: Start accepts. Automaton has 1868 states and 3600 transitions. Word has length 49 [2021-11-23 02:26:40,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:40,002 INFO L470 AbstractCegarLoop]: Abstraction has 1868 states and 3600 transitions. [2021-11-23 02:26:40,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:26:40,002 INFO L276 IsEmpty]: Start isEmpty. Operand 1868 states and 3600 transitions. [2021-11-23 02:26:40,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:26:40,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:40,010 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:40,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:26:40,010 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:40,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:40,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1918844684, now seen corresponding path program 1 times [2021-11-23 02:26:40,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:40,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733403040] [2021-11-23 02:26:40,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:40,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:40,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:40,136 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:26:40,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:40,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733403040] [2021-11-23 02:26:40,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733403040] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:40,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765834994] [2021-11-23 02:26:40,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:40,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:40,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:40,153 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:40,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:26:40,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:40,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:26:40,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:40,539 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:26:40,541 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:40,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765834994] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:40,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:40,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:26:40,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752163065] [2021-11-23 02:26:40,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:40,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:40,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:40,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:40,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:40,557 INFO L87 Difference]: Start difference. First operand 1868 states and 3600 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:41,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:41,112 INFO L93 Difference]: Finished difference Result 2305 states and 4255 transitions. [2021-11-23 02:26:41,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:41,113 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-23 02:26:41,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:41,132 INFO L225 Difference]: With dead ends: 2305 [2021-11-23 02:26:41,132 INFO L226 Difference]: Without dead ends: 2083 [2021-11-23 02:26:41,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:41,136 INFO L933 BasicCegarLoop]: 3241 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:41,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3376 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:41,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-23 02:26:41,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2079. [2021-11-23 02:26:41,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2079 states, 1987 states have (on average 1.898842476094615) internal successors, (3773), 1991 states have internal predecessors, (3773), 66 states have call successors, (66), 24 states have call predecessors, (66), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-23 02:26:41,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2079 states to 2079 states and 3905 transitions. [2021-11-23 02:26:41,233 INFO L78 Accepts]: Start accepts. Automaton has 2079 states and 3905 transitions. Word has length 94 [2021-11-23 02:26:41,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:41,234 INFO L470 AbstractCegarLoop]: Abstraction has 2079 states and 3905 transitions. [2021-11-23 02:26:41,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:41,235 INFO L276 IsEmpty]: Start isEmpty. Operand 2079 states and 3905 transitions. [2021-11-23 02:26:41,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:26:41,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:41,244 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:41,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:41,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:41,457 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:41,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:41,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1052706348, now seen corresponding path program 1 times [2021-11-23 02:26:41,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:41,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412952288] [2021-11-23 02:26:41,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:41,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:41,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:26:41,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:41,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412952288] [2021-11-23 02:26:41,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412952288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:41,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098962153] [2021-11-23 02:26:41,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:41,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:41,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:41,600 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:41,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:26:41,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:41,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:26:41,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:26:41,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:41,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098962153] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:41,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:41,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:26:41,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910332671] [2021-11-23 02:26:41,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:41,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:41,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:41,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:41,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:41,957 INFO L87 Difference]: Start difference. First operand 2079 states and 3905 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:42,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:42,440 INFO L93 Difference]: Finished difference Result 2932 states and 5176 transitions. [2021-11-23 02:26:42,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:42,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-23 02:26:42,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:42,459 INFO L225 Difference]: With dead ends: 2932 [2021-11-23 02:26:42,460 INFO L226 Difference]: Without dead ends: 2499 [2021-11-23 02:26:42,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:42,464 INFO L933 BasicCegarLoop]: 3240 mSDtfsCounter, 3417 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3417 SdHoareTripleChecker+Valid, 3375 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:42,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3417 Valid, 3375 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:42,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2021-11-23 02:26:42,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 2493. [2021-11-23 02:26:42,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2493 states, 2319 states have (on average 1.833117723156533) internal successors, (4251), 2325 states have internal predecessors, (4251), 124 states have call successors, (124), 48 states have call predecessors, (124), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-23 02:26:42,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2493 states to 2493 states and 4499 transitions. [2021-11-23 02:26:42,572 INFO L78 Accepts]: Start accepts. Automaton has 2493 states and 4499 transitions. Word has length 94 [2021-11-23 02:26:42,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:42,573 INFO L470 AbstractCegarLoop]: Abstraction has 2493 states and 4499 transitions. [2021-11-23 02:26:42,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:42,573 INFO L276 IsEmpty]: Start isEmpty. Operand 2493 states and 4499 transitions. [2021-11-23 02:26:42,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:26:42,577 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:42,577 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:42,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:42,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:42,793 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:42,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:42,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1665862324, now seen corresponding path program 1 times [2021-11-23 02:26:42,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:42,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060350765] [2021-11-23 02:26:42,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:42,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:42,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:42,859 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:26:42,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:42,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060350765] [2021-11-23 02:26:42,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060350765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:42,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425190014] [2021-11-23 02:26:42,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:42,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:42,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:42,868 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:42,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:26:43,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:43,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:26:43,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:43,214 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:26:43,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:43,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425190014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:43,215 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:43,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:26:43,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864833625] [2021-11-23 02:26:43,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:43,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:43,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:43,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:43,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:43,218 INFO L87 Difference]: Start difference. First operand 2493 states and 4499 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:43,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:43,709 INFO L93 Difference]: Finished difference Result 4162 states and 6968 transitions. [2021-11-23 02:26:43,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:43,714 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-23 02:26:43,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:43,740 INFO L225 Difference]: With dead ends: 4162 [2021-11-23 02:26:43,740 INFO L226 Difference]: Without dead ends: 3315 [2021-11-23 02:26:43,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:43,751 INFO L933 BasicCegarLoop]: 3214 mSDtfsCounter, 3420 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3420 SdHoareTripleChecker+Valid, 3349 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:43,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3420 Valid, 3349 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:43,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3315 states. [2021-11-23 02:26:43,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3315 to 3305. [2021-11-23 02:26:43,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3305 states, 2971 states have (on average 1.7445304611242005) internal successors, (5183), 2981 states have internal predecessors, (5183), 236 states have call successors, (236), 96 states have call predecessors, (236), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2021-11-23 02:26:43,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3305 states to 3305 states and 5655 transitions. [2021-11-23 02:26:43,924 INFO L78 Accepts]: Start accepts. Automaton has 3305 states and 5655 transitions. Word has length 94 [2021-11-23 02:26:43,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:43,925 INFO L470 AbstractCegarLoop]: Abstraction has 3305 states and 5655 transitions. [2021-11-23 02:26:43,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:43,925 INFO L276 IsEmpty]: Start isEmpty. Operand 3305 states and 5655 transitions. [2021-11-23 02:26:43,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:26:43,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:43,931 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:43,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:44,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:44,152 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:44,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:44,153 INFO L85 PathProgramCache]: Analyzing trace with hash 346869204, now seen corresponding path program 1 times [2021-11-23 02:26:44,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:44,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417501219] [2021-11-23 02:26:44,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:44,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:44,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:44,261 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:26:44,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:44,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417501219] [2021-11-23 02:26:44,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417501219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:44,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:44,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:44,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780544585] [2021-11-23 02:26:44,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:44,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:44,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:44,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:44,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:44,265 INFO L87 Difference]: Start difference. First operand 3305 states and 5655 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:26:44,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:44,812 INFO L93 Difference]: Finished difference Result 4595 states and 7568 transitions. [2021-11-23 02:26:44,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:44,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2021-11-23 02:26:44,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:44,843 INFO L225 Difference]: With dead ends: 4595 [2021-11-23 02:26:44,844 INFO L226 Difference]: Without dead ends: 3745 [2021-11-23 02:26:44,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:44,851 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 73 mSDsluCounter, 3444 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 6482 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:44,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 6482 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:44,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3745 states. [2021-11-23 02:26:44,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3745 to 3589. [2021-11-23 02:26:44,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3589 states, 3239 states have (on average 1.7409694350108058) internal successors, (5639), 3249 states have internal predecessors, (5639), 244 states have call successors, (244), 104 states have call predecessors, (244), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-23 02:26:45,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3589 states to 3589 states and 6127 transitions. [2021-11-23 02:26:45,006 INFO L78 Accepts]: Start accepts. Automaton has 3589 states and 6127 transitions. Word has length 94 [2021-11-23 02:26:45,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:45,009 INFO L470 AbstractCegarLoop]: Abstraction has 3589 states and 6127 transitions. [2021-11-23 02:26:45,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:26:45,009 INFO L276 IsEmpty]: Start isEmpty. Operand 3589 states and 6127 transitions. [2021-11-23 02:26:45,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:26:45,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:45,017 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:45,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:26:45,017 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:45,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:45,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1955891450, now seen corresponding path program 1 times [2021-11-23 02:26:45,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:45,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584396285] [2021-11-23 02:26:45,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:45,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:45,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:45,129 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:26:45,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:45,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584396285] [2021-11-23 02:26:45,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584396285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:45,130 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:45,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:45,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768376892] [2021-11-23 02:26:45,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:45,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:45,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:45,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:45,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:45,133 INFO L87 Difference]: Start difference. First operand 3589 states and 6127 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:45,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:45,808 INFO L93 Difference]: Finished difference Result 7402 states and 11820 transitions. [2021-11-23 02:26:45,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:45,821 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-23 02:26:45,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:45,868 INFO L225 Difference]: With dead ends: 7402 [2021-11-23 02:26:45,868 INFO L226 Difference]: Without dead ends: 5459 [2021-11-23 02:26:45,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:45,878 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3409 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:45,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3409 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:26:45,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5459 states. [2021-11-23 02:26:46,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5459 to 5433. [2021-11-23 02:26:46,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5433 states, 4755 states have (on average 1.6502628811777076) internal successors, (7847), 4773 states have internal predecessors, (7847), 468 states have call successors, (468), 208 states have call predecessors, (468), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-23 02:26:46,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5433 states to 5433 states and 8783 transitions. [2021-11-23 02:26:46,190 INFO L78 Accepts]: Start accepts. Automaton has 5433 states and 8783 transitions. Word has length 126 [2021-11-23 02:26:46,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:46,191 INFO L470 AbstractCegarLoop]: Abstraction has 5433 states and 8783 transitions. [2021-11-23 02:26:46,192 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:46,192 INFO L276 IsEmpty]: Start isEmpty. Operand 5433 states and 8783 transitions. [2021-11-23 02:26:46,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:26:46,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:46,210 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:46,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:26:46,211 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:46,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:46,211 INFO L85 PathProgramCache]: Analyzing trace with hash -129461655, now seen corresponding path program 1 times [2021-11-23 02:26:46,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:46,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448076926] [2021-11-23 02:26:46,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:46,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:46,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:46,297 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:26:46,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:46,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448076926] [2021-11-23 02:26:46,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448076926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:46,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:46,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:46,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395068690] [2021-11-23 02:26:46,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:46,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:46,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:46,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:46,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:46,301 INFO L87 Difference]: Start difference. First operand 5433 states and 8783 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:47,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:47,035 INFO L93 Difference]: Finished difference Result 12862 states and 19764 transitions. [2021-11-23 02:26:47,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:47,036 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-23 02:26:47,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:47,096 INFO L225 Difference]: With dead ends: 12862 [2021-11-23 02:26:47,096 INFO L226 Difference]: Without dead ends: 9075 [2021-11-23 02:26:47,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:47,116 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:47,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:47,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9075 states. [2021-11-23 02:26:47,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9075 to 9025. [2021-11-23 02:26:47,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9025 states, 7707 states have (on average 1.5703905540417802) internal successors, (12103), 7741 states have internal predecessors, (12103), 900 states have call successors, (900), 416 states have call predecessors, (900), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2021-11-23 02:26:47,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9025 states to 9025 states and 13903 transitions. [2021-11-23 02:26:47,598 INFO L78 Accepts]: Start accepts. Automaton has 9025 states and 13903 transitions. Word has length 126 [2021-11-23 02:26:47,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:47,599 INFO L470 AbstractCegarLoop]: Abstraction has 9025 states and 13903 transitions. [2021-11-23 02:26:47,599 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:47,600 INFO L276 IsEmpty]: Start isEmpty. Operand 9025 states and 13903 transitions. [2021-11-23 02:26:47,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:26:47,629 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:47,629 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:47,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:26:47,630 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:47,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:47,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1497791086, now seen corresponding path program 1 times [2021-11-23 02:26:47,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:47,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864753289] [2021-11-23 02:26:47,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:47,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:47,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:47,706 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:26:47,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:47,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864753289] [2021-11-23 02:26:47,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864753289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:47,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:47,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:47,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604503346] [2021-11-23 02:26:47,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:47,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:47,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:47,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:47,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:47,710 INFO L87 Difference]: Start difference. First operand 9025 states and 13903 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:48,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:48,807 INFO L93 Difference]: Finished difference Result 23494 states and 35060 transitions. [2021-11-23 02:26:48,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:48,808 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-23 02:26:48,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:48,882 INFO L225 Difference]: With dead ends: 23494 [2021-11-23 02:26:48,882 INFO L226 Difference]: Without dead ends: 16115 [2021-11-23 02:26:48,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:48,916 INFO L933 BasicCegarLoop]: 3230 mSDtfsCounter, 3414 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3414 SdHoareTripleChecker+Valid, 3365 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:48,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3414 Valid, 3365 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:48,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16115 states. [2021-11-23 02:26:49,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16115 to 16017. [2021-11-23 02:26:49,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16017 states, 13451 states have (on average 1.5088097539216414) internal successors, (20295), 13517 states have internal predecessors, (20295), 1732 states have call successors, (1732), 832 states have call predecessors, (1732), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-23 02:26:49,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16017 states to 16017 states and 23759 transitions. [2021-11-23 02:26:49,542 INFO L78 Accepts]: Start accepts. Automaton has 16017 states and 23759 transitions. Word has length 126 [2021-11-23 02:26:49,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:49,542 INFO L470 AbstractCegarLoop]: Abstraction has 16017 states and 23759 transitions. [2021-11-23 02:26:49,543 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), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:49,543 INFO L276 IsEmpty]: Start isEmpty. Operand 16017 states and 23759 transitions. [2021-11-23 02:26:49,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:26:49,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:49,604 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:49,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:26:49,604 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:49,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:49,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1659039175, now seen corresponding path program 1 times [2021-11-23 02:26:49,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:49,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535197032] [2021-11-23 02:26:49,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:49,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:49,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:49,711 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-23 02:26:49,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:49,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535197032] [2021-11-23 02:26:49,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535197032] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:49,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466572615] [2021-11-23 02:26:49,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:49,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:49,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:49,717 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:49,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:26:49,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:49,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:26:49,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:50,154 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:26:50,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:50,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466572615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:50,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:50,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:26:50,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490779600] [2021-11-23 02:26:50,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:50,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:50,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:50,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:50,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:50,159 INFO L87 Difference]: Start difference. First operand 16017 states and 23759 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:26:51,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:51,306 INFO L93 Difference]: Finished difference Result 29013 states and 42769 transitions. [2021-11-23 02:26:51,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:51,306 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-23 02:26:51,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:51,395 INFO L225 Difference]: With dead ends: 29013 [2021-11-23 02:26:51,396 INFO L226 Difference]: Without dead ends: 21635 [2021-11-23 02:26:51,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:51,424 INFO L933 BasicCegarLoop]: 3305 mSDtfsCounter, 110 mSDsluCounter, 3445 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 6513 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:51,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 6513 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:51,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21635 states. [2021-11-23 02:26:52,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21635 to 18913. [2021-11-23 02:26:52,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18913 states, 16155 states have (on average 1.5355617455896007) internal successors, (24807), 16221 states have internal predecessors, (24807), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-23 02:26:52,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18913 states to 18913 states and 28463 transitions. [2021-11-23 02:26:52,230 INFO L78 Accepts]: Start accepts. Automaton has 18913 states and 28463 transitions. Word has length 145 [2021-11-23 02:26:52,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:52,231 INFO L470 AbstractCegarLoop]: Abstraction has 18913 states and 28463 transitions. [2021-11-23 02:26:52,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:26:52,232 INFO L276 IsEmpty]: Start isEmpty. Operand 18913 states and 28463 transitions. [2021-11-23 02:26:52,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:26:52,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:52,294 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:52,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:52,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:52,509 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:52,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:52,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1272632697, now seen corresponding path program 2 times [2021-11-23 02:26:52,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:52,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904394027] [2021-11-23 02:26:52,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:52,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:52,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:52,614 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:26:52,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:52,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904394027] [2021-11-23 02:26:52,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904394027] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:52,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375904353] [2021-11-23 02:26:52,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:52,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:52,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:52,616 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:52,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:26:52,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:26:52,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:52,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:26:52,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:53,033 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:26:53,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:53,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375904353] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:53,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:53,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:26:53,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031399063] [2021-11-23 02:26:53,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:53,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:53,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:53,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:53,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:53,036 INFO L87 Difference]: Start difference. First operand 18913 states and 28463 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:26:54,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:54,423 INFO L93 Difference]: Finished difference Result 29253 states and 44337 transitions. [2021-11-23 02:26:54,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:54,424 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-23 02:26:54,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:54,503 INFO L225 Difference]: With dead ends: 29253 [2021-11-23 02:26:54,503 INFO L226 Difference]: Without dead ends: 18979 [2021-11-23 02:26:54,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:54,531 INFO L933 BasicCegarLoop]: 3325 mSDtfsCounter, 141 mSDsluCounter, 3432 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 6518 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:54,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 6518 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:26:54,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18979 states. [2021-11-23 02:26:55,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18979 to 18849. [2021-11-23 02:26:55,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18849 states, 16091 states have (on average 1.5217823628115095) internal successors, (24487), 16157 states have internal predecessors, (24487), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-23 02:26:55,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18849 states to 18849 states and 28143 transitions. [2021-11-23 02:26:55,558 INFO L78 Accepts]: Start accepts. Automaton has 18849 states and 28143 transitions. Word has length 145 [2021-11-23 02:26:55,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:55,559 INFO L470 AbstractCegarLoop]: Abstraction has 18849 states and 28143 transitions. [2021-11-23 02:26:55,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:26:55,559 INFO L276 IsEmpty]: Start isEmpty. Operand 18849 states and 28143 transitions. [2021-11-23 02:26:55,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:26:55,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:55,615 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:55,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:55,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:26:55,829 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:55,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:55,829 INFO L85 PathProgramCache]: Analyzing trace with hash -792319095, now seen corresponding path program 1 times [2021-11-23 02:26:55,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:55,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621206882] [2021-11-23 02:26:55,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:55,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:55,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:55,955 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:26:55,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:55,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621206882] [2021-11-23 02:26:55,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621206882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:55,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192200399] [2021-11-23 02:26:55,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:55,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:55,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:55,958 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:55,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:26:56,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:56,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:26:56,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:56,351 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:26:56,351 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:56,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192200399] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:56,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:56,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:26:56,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986062758] [2021-11-23 02:26:56,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:56,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:56,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:56,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:56,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:56,354 INFO L87 Difference]: Start difference. First operand 18849 states and 28143 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:26:57,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:57,643 INFO L93 Difference]: Finished difference Result 27757 states and 41601 transitions. [2021-11-23 02:26:57,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:57,644 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-23 02:26:57,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:57,714 INFO L225 Difference]: With dead ends: 27757 [2021-11-23 02:26:57,714 INFO L226 Difference]: Without dead ends: 18915 [2021-11-23 02:26:57,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:57,739 INFO L933 BasicCegarLoop]: 3313 mSDtfsCounter, 138 mSDsluCounter, 3431 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 6505 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:57,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 6505 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:26:57,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18915 states. [2021-11-23 02:26:58,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18915 to 18689. [2021-11-23 02:26:58,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18689 states, 15931 states have (on average 1.5049274998430733) internal successors, (23975), 15997 states have internal predecessors, (23975), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-23 02:26:58,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18689 states to 18689 states and 27631 transitions. [2021-11-23 02:26:58,580 INFO L78 Accepts]: Start accepts. Automaton has 18689 states and 27631 transitions. Word has length 145 [2021-11-23 02:26:58,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:58,581 INFO L470 AbstractCegarLoop]: Abstraction has 18689 states and 27631 transitions. [2021-11-23 02:26:58,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:26:58,582 INFO L276 IsEmpty]: Start isEmpty. Operand 18689 states and 27631 transitions. [2021-11-23 02:26:58,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:26:58,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:58,629 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:58,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:58,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:58,849 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:58,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:58,849 INFO L85 PathProgramCache]: Analyzing trace with hash 319211079, now seen corresponding path program 1 times [2021-11-23 02:26:58,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:58,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605128198] [2021-11-23 02:26:58,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:58,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:58,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:26:58,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:58,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605128198] [2021-11-23 02:26:58,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605128198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:58,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590937338] [2021-11-23 02:26:58,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:58,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:58,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:58,940 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:58,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:26:59,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:59,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:26:59,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:59,313 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:26:59,313 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:59,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590937338] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:59,313 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:59,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:26:59,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971245593] [2021-11-23 02:26:59,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:59,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:59,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:59,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:59,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:59,316 INFO L87 Difference]: Start difference. First operand 18689 states and 27631 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:00,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:00,470 INFO L93 Difference]: Finished difference Result 31061 states and 44714 transitions. [2021-11-23 02:27:00,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:00,471 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-23 02:27:00,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:00,553 INFO L225 Difference]: With dead ends: 31061 [2021-11-23 02:27:00,554 INFO L226 Difference]: Without dead ends: 22459 [2021-11-23 02:27:00,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:00,581 INFO L933 BasicCegarLoop]: 3220 mSDtfsCounter, 3417 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3417 SdHoareTripleChecker+Valid, 3259 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:00,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3417 Valid, 3259 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:27:00,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22459 states. [2021-11-23 02:27:01,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22459 to 22459. [2021-11-23 02:27:01,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22459 states, 19321 states have (on average 1.4494591377257906) internal successors, (28005), 19387 states have internal predecessors, (28005), 1954 states have call successors, (1954), 1182 states have call predecessors, (1954), 1182 states have return successors, (1954), 1890 states have call predecessors, (1954), 1954 states have call successors, (1954) [2021-11-23 02:27:01,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22459 states to 22459 states and 31913 transitions. [2021-11-23 02:27:01,487 INFO L78 Accepts]: Start accepts. Automaton has 22459 states and 31913 transitions. Word has length 145 [2021-11-23 02:27:01,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:01,487 INFO L470 AbstractCegarLoop]: Abstraction has 22459 states and 31913 transitions. [2021-11-23 02:27:01,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:01,488 INFO L276 IsEmpty]: Start isEmpty. Operand 22459 states and 31913 transitions. [2021-11-23 02:27:01,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:27:01,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:01,545 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:01,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:01,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:27:01,761 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:01,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:01,761 INFO L85 PathProgramCache]: Analyzing trace with hash 834571148, now seen corresponding path program 1 times [2021-11-23 02:27:01,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:01,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54491720] [2021-11-23 02:27:01,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:01,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:01,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:01,850 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:27:01,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:01,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54491720] [2021-11-23 02:27:01,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54491720] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:01,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978438509] [2021-11-23 02:27:01,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:01,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:01,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:01,852 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:01,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:27:02,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:02,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 828 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:27:02,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:02,314 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:27:02,315 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:02,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978438509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:02,315 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:02,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:27:02,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339749708] [2021-11-23 02:27:02,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:02,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:27:02,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:02,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:27:02,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:27:02,317 INFO L87 Difference]: Start difference. First operand 22459 states and 31913 transitions. Second operand has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:27:04,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:04,199 INFO L93 Difference]: Finished difference Result 64557 states and 89721 transitions. [2021-11-23 02:27:04,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:04,200 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 146 [2021-11-23 02:27:04,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:04,364 INFO L225 Difference]: With dead ends: 64557 [2021-11-23 02:27:04,364 INFO L226 Difference]: Without dead ends: 43745 [2021-11-23 02:27:04,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:27:04,416 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3435 mSDsluCounter, 3754 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 6825 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:04,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3435 Valid, 6825 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:27:04,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43745 states. [2021-11-23 02:27:05,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43745 to 43679. [2021-11-23 02:27:05,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43679 states, 37413 states have (on average 1.4130115200598723) internal successors, (52865), 37607 states have internal predecessors, (52865), 3838 states have call successors, (3838), 2362 states have call predecessors, (3838), 2426 states have return successors, (4030), 3710 states have call predecessors, (4030), 3838 states have call successors, (4030) [2021-11-23 02:27:06,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43679 states to 43679 states and 60733 transitions. [2021-11-23 02:27:06,118 INFO L78 Accepts]: Start accepts. Automaton has 43679 states and 60733 transitions. Word has length 146 [2021-11-23 02:27:06,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:06,118 INFO L470 AbstractCegarLoop]: Abstraction has 43679 states and 60733 transitions. [2021-11-23 02:27:06,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:27:06,119 INFO L276 IsEmpty]: Start isEmpty. Operand 43679 states and 60733 transitions. [2021-11-23 02:27:06,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:27:06,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:06,242 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:06,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:06,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:27:06,457 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:06,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:06,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1521084349, now seen corresponding path program 1 times [2021-11-23 02:27:06,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:06,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496332574] [2021-11-23 02:27:06,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:06,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:06,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:27:06,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:06,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496332574] [2021-11-23 02:27:06,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496332574] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:06,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316208414] [2021-11-23 02:27:06,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:06,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:06,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:06,553 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:06,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:27:06,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:06,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:27:06,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:27:06,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:06,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316208414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:06,978 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:06,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:27:06,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427045371] [2021-11-23 02:27:06,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:06,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:06,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:06,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:06,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:06,981 INFO L87 Difference]: Start difference. First operand 43679 states and 60733 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:09,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:09,190 INFO L93 Difference]: Finished difference Result 101577 states and 142240 transitions. [2021-11-23 02:27:09,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:09,190 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2021-11-23 02:27:09,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:09,473 INFO L225 Difference]: With dead ends: 101577 [2021-11-23 02:27:09,473 INFO L226 Difference]: Without dead ends: 59545 [2021-11-23 02:27:09,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:09,563 INFO L933 BasicCegarLoop]: 3225 mSDtfsCounter, 75 mSDsluCounter, 3434 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 6422 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:09,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 6422 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:27:09,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59545 states. [2021-11-23 02:27:11,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59545 to 49227. [2021-11-23 02:27:11,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49227 states, 42571 states have (on average 1.438890324399239) internal successors, (61255), 42767 states have internal predecessors, (61255), 4033 states have call successors, (4033), 2557 states have call predecessors, (4033), 2621 states have return successors, (4225), 3903 states have call predecessors, (4225), 4033 states have call successors, (4225) [2021-11-23 02:27:12,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49227 states to 49227 states and 69513 transitions. [2021-11-23 02:27:12,021 INFO L78 Accepts]: Start accepts. Automaton has 49227 states and 69513 transitions. Word has length 146 [2021-11-23 02:27:12,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:12,022 INFO L470 AbstractCegarLoop]: Abstraction has 49227 states and 69513 transitions. [2021-11-23 02:27:12,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:12,022 INFO L276 IsEmpty]: Start isEmpty. Operand 49227 states and 69513 transitions. [2021-11-23 02:27:12,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 02:27:12,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:12,143 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:12,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:12,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:27:12,357 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:12,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:12,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1022035290, now seen corresponding path program 1 times [2021-11-23 02:27:12,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:12,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8586755] [2021-11-23 02:27:12,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:12,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:12,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:12,467 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:27:12,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:12,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8586755] [2021-11-23 02:27:12,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8586755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:12,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472550618] [2021-11-23 02:27:12,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:12,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:12,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:12,469 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:12,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:27:12,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:12,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:27:12,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:13,163 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:27:13,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:13,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472550618] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:13,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:13,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-23 02:27:13,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256123151] [2021-11-23 02:27:13,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:13,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:13,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:13,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:13,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:13,169 INFO L87 Difference]: Start difference. First operand 49227 states and 69513 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:15,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:15,455 INFO L93 Difference]: Finished difference Result 87102 states and 121700 transitions. [2021-11-23 02:27:15,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:15,456 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-23 02:27:15,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:15,562 INFO L225 Difference]: With dead ends: 87102 [2021-11-23 02:27:15,562 INFO L226 Difference]: Without dead ends: 39522 [2021-11-23 02:27:15,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:27:15,634 INFO L933 BasicCegarLoop]: 3209 mSDtfsCounter, 7086 mSDsluCounter, 6780 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7101 SdHoareTripleChecker+Valid, 9522 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:15,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7101 Valid, 9522 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:27:15,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39522 states. [2021-11-23 02:27:17,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39522 to 38140. [2021-11-23 02:27:17,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38140 states, 33039 states have (on average 1.4396622173794607) internal successors, (47565), 33202 states have internal predecessors, (47565), 3049 states have call successors, (3049), 1922 states have call predecessors, (3049), 2050 states have return successors, (3177), 3016 states have call predecessors, (3177), 3049 states have call successors, (3177) [2021-11-23 02:27:17,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38140 states to 38140 states and 53791 transitions. [2021-11-23 02:27:17,161 INFO L78 Accepts]: Start accepts. Automaton has 38140 states and 53791 transitions. Word has length 147 [2021-11-23 02:27:17,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:17,162 INFO L470 AbstractCegarLoop]: Abstraction has 38140 states and 53791 transitions. [2021-11-23 02:27:17,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:17,162 INFO L276 IsEmpty]: Start isEmpty. Operand 38140 states and 53791 transitions. [2021-11-23 02:27:17,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:27:17,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:17,218 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:17,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:17,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:17,418 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:17,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:17,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1177392296, now seen corresponding path program 2 times [2021-11-23 02:27:17,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:17,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259451239] [2021-11-23 02:27:17,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:17,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:17,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:17,507 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:27:17,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:17,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259451239] [2021-11-23 02:27:17,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259451239] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:17,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109853151] [2021-11-23 02:27:17,508 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:17,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:17,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:17,509 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:17,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:27:17,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:27:17,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:17,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:27:17,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:18,134 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:27:18,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:18,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109853151] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:18,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:18,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:27:18,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811742275] [2021-11-23 02:27:18,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:18,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:18,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:18,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:18,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:18,138 INFO L87 Difference]: Start difference. First operand 38140 states and 53791 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:19,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:19,586 INFO L93 Difference]: Finished difference Result 50539 states and 71165 transitions. [2021-11-23 02:27:19,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:19,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2021-11-23 02:27:19,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:19,668 INFO L225 Difference]: With dead ends: 50539 [2021-11-23 02:27:19,668 INFO L226 Difference]: Without dead ends: 36572 [2021-11-23 02:27:19,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:19,697 INFO L933 BasicCegarLoop]: 3219 mSDtfsCounter, 40 mSDsluCounter, 3433 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 6415 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:19,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 6415 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:27:19,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36572 states. [2021-11-23 02:27:20,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36572 to 34460. [2021-11-23 02:27:20,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34460 states, 29743 states have (on average 1.4625626197760817) internal successors, (43501), 29810 states have internal predecessors, (43501), 2921 states have call successors, (2921), 1794 states have call predecessors, (2921), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2021-11-23 02:27:20,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34460 states to 34460 states and 49343 transitions. [2021-11-23 02:27:20,991 INFO L78 Accepts]: Start accepts. Automaton has 34460 states and 49343 transitions. Word has length 148 [2021-11-23 02:27:20,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:20,991 INFO L470 AbstractCegarLoop]: Abstraction has 34460 states and 49343 transitions. [2021-11-23 02:27:20,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:20,991 INFO L276 IsEmpty]: Start isEmpty. Operand 34460 states and 49343 transitions. [2021-11-23 02:27:21,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:27:21,043 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:21,044 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:21,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:21,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:27:21,244 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:21,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:21,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1622430883, now seen corresponding path program 1 times [2021-11-23 02:27:21,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:21,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254292630] [2021-11-23 02:27:21,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:21,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:21,332 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:27:21,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:21,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254292630] [2021-11-23 02:27:21,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254292630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:21,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172747612] [2021-11-23 02:27:21,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:21,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:21,334 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:21,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:27:21,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:21,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:27:21,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:21,807 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:27:21,808 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:21,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172747612] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:21,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:21,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-23 02:27:21,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017616129] [2021-11-23 02:27:21,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:21,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:21,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:21,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:21,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:27:21,812 INFO L87 Difference]: Start difference. First operand 34460 states and 49343 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:24,357 INFO L93 Difference]: Finished difference Result 82716 states and 117005 transitions. [2021-11-23 02:27:24,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:24,358 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2021-11-23 02:27:24,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:24,480 INFO L225 Difference]: With dead ends: 82716 [2021-11-23 02:27:24,480 INFO L226 Difference]: Without dead ends: 49954 [2021-11-23 02:27:24,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:27:24,517 INFO L933 BasicCegarLoop]: 3200 mSDtfsCounter, 7072 mSDsluCounter, 6769 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7087 SdHoareTripleChecker+Valid, 9503 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:24,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7087 Valid, 9503 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:27:24,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49954 states. [2021-11-23 02:27:26,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49954 to 49952. [2021-11-23 02:27:26,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49952 states, 42939 states have (on average 1.438529076131256) internal successors, (61769), 43038 states have internal predecessors, (61769), 4325 states have call successors, (4325), 2686 states have call predecessors, (4325), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2021-11-23 02:27:26,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49952 states to 49952 states and 70419 transitions. [2021-11-23 02:27:26,552 INFO L78 Accepts]: Start accepts. Automaton has 49952 states and 70419 transitions. Word has length 148 [2021-11-23 02:27:26,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:26,552 INFO L470 AbstractCegarLoop]: Abstraction has 49952 states and 70419 transitions. [2021-11-23 02:27:26,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:26,553 INFO L276 IsEmpty]: Start isEmpty. Operand 49952 states and 70419 transitions. [2021-11-23 02:27:26,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-23 02:27:26,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:26,649 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:26,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:26,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:27:26,850 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:26,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:26,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1823954071, now seen corresponding path program 1 times [2021-11-23 02:27:26,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:26,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113839619] [2021-11-23 02:27:26,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:26,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:26,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:26,929 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:27:26,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:26,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113839619] [2021-11-23 02:27:26,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113839619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:26,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428101003] [2021-11-23 02:27:26,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:26,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:26,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:26,931 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:26,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:27:27,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:27,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:27:27,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:27,448 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:27:27,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:27,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428101003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:27,449 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:27,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-23 02:27:27,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819817580] [2021-11-23 02:27:27,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:27,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:27,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:27,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:27,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:27:27,451 INFO L87 Difference]: Start difference. First operand 49952 states and 70419 transitions. Second operand has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:30,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:30,823 INFO L93 Difference]: Finished difference Result 120784 states and 168585 transitions. [2021-11-23 02:27:30,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:30,823 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 150 [2021-11-23 02:27:30,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:31,046 INFO L225 Difference]: With dead ends: 120784 [2021-11-23 02:27:31,046 INFO L226 Difference]: Without dead ends: 72530 [2021-11-23 02:27:31,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:27:31,124 INFO L933 BasicCegarLoop]: 3205 mSDtfsCounter, 3717 mSDsluCounter, 6848 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3732 SdHoareTripleChecker+Valid, 9572 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:31,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3732 Valid, 9572 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:27:31,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72530 states. [2021-11-23 02:27:34,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72530 to 72528. [2021-11-23 02:27:34,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72528 states, 62099 states have (on average 1.4142739818676628) internal successors, (87825), 62246 states have internal predecessors, (87825), 6405 states have call successors, (6405), 4022 states have call predecessors, (6405), 4022 states have return successors, (6405), 6260 states have call predecessors, (6405), 6405 states have call successors, (6405) [2021-11-23 02:27:34,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72528 states to 72528 states and 100635 transitions. [2021-11-23 02:27:34,430 INFO L78 Accepts]: Start accepts. Automaton has 72528 states and 100635 transitions. Word has length 150 [2021-11-23 02:27:34,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:34,431 INFO L470 AbstractCegarLoop]: Abstraction has 72528 states and 100635 transitions. [2021-11-23 02:27:34,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:27:34,431 INFO L276 IsEmpty]: Start isEmpty. Operand 72528 states and 100635 transitions. [2021-11-23 02:27:34,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:27:34,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:34,565 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:34,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:34,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:27:34,765 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:34,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:34,766 INFO L85 PathProgramCache]: Analyzing trace with hash 50610940, now seen corresponding path program 1 times [2021-11-23 02:27:34,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:34,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360151392] [2021-11-23 02:27:34,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:34,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:34,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:34,845 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 02:27:34,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:34,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360151392] [2021-11-23 02:27:34,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360151392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:34,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857304184] [2021-11-23 02:27:34,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:34,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:34,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:34,857 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:34,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68cbac5b-f7bc-402f-8cf0-44b55c8b4bd1/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:27:35,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:35,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:27:35,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:35,232 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:27:35,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:35,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857304184] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:35,233 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:35,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:27:35,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707983687] [2021-11-23 02:27:35,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:35,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:35,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:35,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:35,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:35,236 INFO L87 Difference]: Start difference. First operand 72528 states and 100635 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)