./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5c885e36ce67f972719c7330e2fdf8e1794f0d30dd144b261109fa7b0892a972 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:38:44,920 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:38:44,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:38:44,988 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:38:44,989 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:38:44,995 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:38:44,997 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:38:45,002 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:38:45,005 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:38:45,014 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:38:45,016 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:38:45,018 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:38:45,019 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:38:45,022 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:38:45,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:38:45,034 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:38:45,036 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:38:45,038 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:38:45,040 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:38:45,050 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:38:45,053 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:38:45,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:38:45,059 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:38:45,060 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:38:45,064 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:38:45,065 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:38:45,065 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:38:45,067 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:38:45,068 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:38:45,070 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:38:45,070 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:38:45,072 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:38:45,074 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:38:45,075 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:38:45,077 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:38:45,078 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:38:45,078 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:38:45,079 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:38:45,079 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:38:45,080 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:38:45,081 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:38:45,082 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:38:45,128 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:38:45,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:38:45,129 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:38:45,129 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:38:45,130 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:38:45,131 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:38:45,131 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:38:45,131 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:38:45,131 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:38:45,131 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:38:45,132 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:38:45,133 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:38:45,133 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:38:45,133 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:38:45,133 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:38:45,134 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:38:45,134 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:38:45,134 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:38:45,135 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:38:45,135 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:38:45,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:38:45,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:38:45,136 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:38:45,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:38:45,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:38:45,136 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:38:45,138 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:38:45,138 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:38:45,138 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:38:45,139 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:38:45,139 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:38:45,139 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:38:45,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:38:45,140 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:38:45,140 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:38:45,140 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:38:45,140 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:38:45,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:38:45,141 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:38:45,141 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:38:45,141 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:38:45,141 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_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5c885e36ce67f972719c7330e2fdf8e1794f0d30dd144b261109fa7b0892a972 [2021-11-25 20:38:45,445 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:38:45,478 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:38:45,481 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:38:45,483 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:38:45,483 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:38:45,485 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c [2021-11-25 20:38:45,555 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/data/e91c041a3/058221e5969244cab1eb848a7cad74ae/FLAGedf3c840d [2021-11-25 20:38:46,760 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:38:46,761 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c [2021-11-25 20:38:46,831 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/data/e91c041a3/058221e5969244cab1eb848a7cad74ae/FLAGedf3c840d [2021-11-25 20:38:46,969 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/data/e91c041a3/058221e5969244cab1eb848a7cad74ae [2021-11-25 20:38:46,973 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:38:46,975 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:38:46,978 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:38:46,978 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:38:46,982 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:38:46,983 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:38:46" (1/1) ... [2021-11-25 20:38:46,984 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@388e2eb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:46, skipping insertion in model container [2021-11-25 20:38:46,984 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:38:46" (1/1) ... [2021-11-25 20:38:46,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:38:47,258 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:38:49,759 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_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[380323,380336] [2021-11-25 20:38:49,800 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_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[383339,383352] [2021-11-25 20:38:50,305 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:38:50,319 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:38:51,761 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_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[380323,380336] [2021-11-25 20:38:51,774 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_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[383339,383352] [2021-11-25 20:38:51,823 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:38:51,941 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:38:51,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51 WrapperNode [2021-11-25 20:38:51,942 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:38:51,943 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:38:51,943 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:38:51,944 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:38:51,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:52,131 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:52,681 INFO L137 Inliner]: procedures = 68, calls = 78, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 13202 [2021-11-25 20:38:52,681 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:38:52,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:38:52,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:38:52,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:38:52,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:52,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:52,883 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:52,883 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:53,315 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:53,406 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:53,441 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:53,564 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:38:53,565 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:38:53,566 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:38:53,566 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:38:53,567 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (1/1) ... [2021-11-25 20:38:53,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:38:53,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:53,616 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:38:53,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:38:53,708 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:38:53,709 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 20:38:53,709 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 20:38:53,709 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 20:38:53,710 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 20:38:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 20:38:53,710 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 20:38:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-25 20:38:53,711 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-25 20:38:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 20:38:53,711 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 20:38:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 20:38:53,711 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 20:38:53,712 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 20:38:53,712 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 20:38:53,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:38:53,712 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:38:53,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:38:54,059 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:38:54,061 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:39:03,061 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:39:06,042 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:39:06,042 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-25 20:39:06,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:39:06 BoogieIcfgContainer [2021-11-25 20:39:06,049 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:39:06,052 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:39:06,052 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:39:06,056 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:39:06,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:38:46" (1/3) ... [2021-11-25 20:39:06,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1380e9d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:39:06, skipping insertion in model container [2021-11-25 20:39:06,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:38:51" (2/3) ... [2021-11-25 20:39:06,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1380e9d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:39:06, skipping insertion in model container [2021-11-25 20:39:06,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:39:06" (3/3) ... [2021-11-25 20:39:06,061 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.14.cil.c [2021-11-25 20:39:06,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:39:06,068 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 20:39:06,137 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:39:06,146 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:39:06,146 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 20:39:06,218 INFO L276 IsEmpty]: Start isEmpty. Operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-25 20:39:06,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 20:39:06,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:06,231 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:06,231 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:06,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:06,237 INFO L85 PathProgramCache]: Analyzing trace with hash -173092528, now seen corresponding path program 1 times [2021-11-25 20:39:06,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:06,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302384896] [2021-11-25 20:39:06,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:06,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:06,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:06,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:39:06,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:06,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302384896] [2021-11-25 20:39:06,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302384896] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:06,861 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:39:06,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:39:06,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97503085] [2021-11-25 20:39:06,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:06,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:39:06,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:06,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:39:06,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:39:06,954 INFO L87 Difference]: Start difference. First operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:39:08,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:08,323 INFO L93 Difference]: Finished difference Result 3844 states and 7447 transitions. [2021-11-25 20:39:08,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:39:08,326 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2021-11-25 20:39:08,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:08,369 INFO L225 Difference]: With dead ends: 3844 [2021-11-25 20:39:08,369 INFO L226 Difference]: Without dead ends: 2006 [2021-11-25 20:39:08,386 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 [2021-11-25 20:39:08,394 INFO L933 BasicCegarLoop]: 3519 mSDtfsCounter, 3787 mSDsluCounter, 3727 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3787 SdHoareTripleChecker+Valid, 6938 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:08,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3787 Valid, 6938 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:39:08,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2006 states. [2021-11-25 20:39:08,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2006 to 2005. [2021-11-25 20:39:08,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 1941 states have (on average 1.919629057187017) internal successors, (3726), 1945 states have internal predecessors, (3726), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-25 20:39:08,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 3824 transitions. [2021-11-25 20:39:08,619 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 3824 transitions. Word has length 68 [2021-11-25 20:39:08,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:08,619 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 3824 transitions. [2021-11-25 20:39:08,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:39:08,620 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 3824 transitions. [2021-11-25 20:39:08,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:08,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:08,637 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, 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] [2021-11-25 20:39:08,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:39:08,637 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:08,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:08,639 INFO L85 PathProgramCache]: Analyzing trace with hash 73452699, now seen corresponding path program 1 times [2021-11-25 20:39:08,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:08,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102269948] [2021-11-25 20:39:08,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:08,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:08,929 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:08,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:08,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102269948] [2021-11-25 20:39:08,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102269948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:08,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992672647] [2021-11-25 20:39:08,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:08,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:08,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:08,939 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:08,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:39:09,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:09,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:09,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:09,606 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:39:09,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:09,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992672647] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:09,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:09,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:09,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038470006] [2021-11-25 20:39:09,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:09,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:09,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:09,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:09,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:09,625 INFO L87 Difference]: Start difference. First operand 2005 states and 3824 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:10,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:10,245 INFO L93 Difference]: Finished difference Result 2716 states and 4939 transitions. [2021-11-25 20:39:10,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:10,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:10,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:10,270 INFO L225 Difference]: With dead ends: 2716 [2021-11-25 20:39:10,271 INFO L226 Difference]: Without dead ends: 2357 [2021-11-25 20:39:10,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:10,276 INFO L933 BasicCegarLoop]: 3359 mSDtfsCounter, 3515 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 3592 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:10,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 3592 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:10,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-11-25 20:39:10,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 2351. [2021-11-25 20:39:10,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2351 states, 2233 states have (on average 1.8669950738916257) internal successors, (4169), 2238 states have internal predecessors, (4169), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-25 20:39:10,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2351 states to 2351 states and 4351 transitions. [2021-11-25 20:39:10,398 INFO L78 Accepts]: Start accepts. Automaton has 2351 states and 4351 transitions. Word has length 137 [2021-11-25 20:39:10,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:10,400 INFO L470 AbstractCegarLoop]: Abstraction has 2351 states and 4351 transitions. [2021-11-25 20:39:10,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:10,400 INFO L276 IsEmpty]: Start isEmpty. Operand 2351 states and 4351 transitions. [2021-11-25 20:39:10,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:10,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:10,413 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, 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] [2021-11-25 20:39:10,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:10,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:10,638 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:10,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:10,639 INFO L85 PathProgramCache]: Analyzing trace with hash 102338939, now seen corresponding path program 1 times [2021-11-25 20:39:10,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:10,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544448915] [2021-11-25 20:39:10,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:10,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:10,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:10,797 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:10,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544448915] [2021-11-25 20:39:10,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544448915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:10,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288860709] [2021-11-25 20:39:10,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:10,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:10,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:10,807 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:10,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:39:11,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:11,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:11,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 20:39:11,398 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:11,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288860709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:11,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:11,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:11,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349494840] [2021-11-25 20:39:11,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:11,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:11,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:11,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:11,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:11,402 INFO L87 Difference]: Start difference. First operand 2351 states and 4351 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:12,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:12,049 INFO L93 Difference]: Finished difference Result 3748 states and 6538 transitions. [2021-11-25 20:39:12,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:12,050 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:12,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:12,077 INFO L225 Difference]: With dead ends: 3748 [2021-11-25 20:39:12,077 INFO L226 Difference]: Without dead ends: 3043 [2021-11-25 20:39:12,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:12,084 INFO L933 BasicCegarLoop]: 3358 mSDtfsCounter, 3527 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3591 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:12,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3591 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:12,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3043 states. [2021-11-25 20:39:12,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3043 to 3035. [2021-11-25 20:39:12,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2811 states have (on average 1.7940234791889007) internal successors, (5043), 2818 states have internal predecessors, (5043), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-25 20:39:12,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5389 transitions. [2021-11-25 20:39:12,243 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5389 transitions. Word has length 137 [2021-11-25 20:39:12,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:12,243 INFO L470 AbstractCegarLoop]: Abstraction has 3035 states and 5389 transitions. [2021-11-25 20:39:12,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:12,244 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5389 transitions. [2021-11-25 20:39:12,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:12,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:12,251 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, 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] [2021-11-25 20:39:12,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:12,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:12,470 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:12,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:12,471 INFO L85 PathProgramCache]: Analyzing trace with hash 930219611, now seen corresponding path program 1 times [2021-11-25 20:39:12,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:12,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076873284] [2021-11-25 20:39:12,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:12,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:12,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:12,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:12,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076873284] [2021-11-25 20:39:12,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076873284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:12,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952723493] [2021-11-25 20:39:12,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:12,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:12,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:12,696 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:12,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:39:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:12,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:12,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:13,218 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:39:13,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:13,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952723493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:13,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:13,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:13,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686133684] [2021-11-25 20:39:13,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:13,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:13,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:13,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:13,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:13,222 INFO L87 Difference]: Start difference. First operand 3035 states and 5389 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:13,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:13,900 INFO L93 Difference]: Finished difference Result 5788 states and 9686 transitions. [2021-11-25 20:39:13,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:13,907 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:13,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:13,945 INFO L225 Difference]: With dead ends: 5788 [2021-11-25 20:39:13,946 INFO L226 Difference]: Without dead ends: 4399 [2021-11-25 20:39:13,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:13,960 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3536 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3536 SdHoareTripleChecker+Valid, 3590 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:13,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3536 Valid, 3590 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:13,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4399 states. [2021-11-25 20:39:14,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4399 to 4387. [2021-11-25 20:39:14,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4387 states, 3955 states have (on average 1.710998735777497) internal successors, (6767), 3966 states have internal predecessors, (6767), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-25 20:39:14,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4387 states to 4387 states and 7433 transitions. [2021-11-25 20:39:14,270 INFO L78 Accepts]: Start accepts. Automaton has 4387 states and 7433 transitions. Word has length 137 [2021-11-25 20:39:14,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:14,271 INFO L470 AbstractCegarLoop]: Abstraction has 4387 states and 7433 transitions. [2021-11-25 20:39:14,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:14,272 INFO L276 IsEmpty]: Start isEmpty. Operand 4387 states and 7433 transitions. [2021-11-25 20:39:14,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:14,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:14,288 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, 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] [2021-11-25 20:39:14,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:14,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:14,514 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:14,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:14,515 INFO L85 PathProgramCache]: Analyzing trace with hash 278859131, now seen corresponding path program 1 times [2021-11-25 20:39:14,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:14,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917483048] [2021-11-25 20:39:14,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:14,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:14,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:14,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:14,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917483048] [2021-11-25 20:39:14,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917483048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:14,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339788881] [2021-11-25 20:39:14,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:14,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:14,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:14,663 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:14,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:39:14,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:14,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:14,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:15,232 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 20:39:15,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:15,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339788881] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:15,233 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:15,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:15,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393056732] [2021-11-25 20:39:15,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:15,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:15,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:15,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:15,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:15,236 INFO L87 Difference]: Start difference. First operand 4387 states and 7433 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:16,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:16,029 INFO L93 Difference]: Finished difference Result 9820 states and 15882 transitions. [2021-11-25 20:39:16,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:16,030 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:16,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:16,104 INFO L225 Difference]: With dead ends: 9820 [2021-11-25 20:39:16,105 INFO L226 Difference]: Without dead ends: 7079 [2021-11-25 20:39:16,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:16,127 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3533 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:16,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:16,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7079 states. [2021-11-25 20:39:16,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7079 to 7059. [2021-11-25 20:39:16,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7059 states, 6219 states have (on average 1.6348287506029908) internal successors, (10167), 6238 states have internal predecessors, (10167), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-25 20:39:16,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7059 states to 7059 states and 11457 transitions. [2021-11-25 20:39:16,698 INFO L78 Accepts]: Start accepts. Automaton has 7059 states and 11457 transitions. Word has length 137 [2021-11-25 20:39:16,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:16,699 INFO L470 AbstractCegarLoop]: Abstraction has 7059 states and 11457 transitions. [2021-11-25 20:39:16,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:16,699 INFO L276 IsEmpty]: Start isEmpty. Operand 7059 states and 11457 transitions. [2021-11-25 20:39:16,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:16,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:16,718 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, 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] [2021-11-25 20:39:16,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:16,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:16,934 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:16,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:16,935 INFO L85 PathProgramCache]: Analyzing trace with hash 2084854363, now seen corresponding path program 1 times [2021-11-25 20:39:16,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:16,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223449063] [2021-11-25 20:39:16,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:16,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:16,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:17,051 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:17,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:17,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223449063] [2021-11-25 20:39:17,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223449063] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:17,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911595894] [2021-11-25 20:39:17,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:17,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:17,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:17,054 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:17,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:39:17,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:17,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:17,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:39:17,684 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:17,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911595894] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:17,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:17,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:17,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802611087] [2021-11-25 20:39:17,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:17,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:17,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:17,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:17,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:17,687 INFO L87 Difference]: Start difference. First operand 7059 states and 11457 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:18,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:18,613 INFO L93 Difference]: Finished difference Result 17788 states and 28074 transitions. [2021-11-25 20:39:18,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:18,614 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:18,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:18,699 INFO L225 Difference]: With dead ends: 17788 [2021-11-25 20:39:18,699 INFO L226 Difference]: Without dead ends: 12375 [2021-11-25 20:39:18,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:18,729 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3506 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3506 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:18,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3506 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:18,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12375 states. [2021-11-25 20:39:19,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12375 to 12339. [2021-11-25 20:39:19,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12339 states, 10699 states have (on average 1.5768763435835125) internal successors, (16871), 10734 states have internal predecessors, (16871), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-25 20:39:19,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12339 states to 12339 states and 19377 transitions. [2021-11-25 20:39:19,370 INFO L78 Accepts]: Start accepts. Automaton has 12339 states and 19377 transitions. Word has length 137 [2021-11-25 20:39:19,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:19,374 INFO L470 AbstractCegarLoop]: Abstraction has 12339 states and 19377 transitions. [2021-11-25 20:39:19,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:19,376 INFO L276 IsEmpty]: Start isEmpty. Operand 12339 states and 19377 transitions. [2021-11-25 20:39:19,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:19,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:19,409 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, 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] [2021-11-25 20:39:19,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:19,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:39:19,638 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:19,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:19,639 INFO L85 PathProgramCache]: Analyzing trace with hash 470849915, now seen corresponding path program 1 times [2021-11-25 20:39:19,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:19,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080716750] [2021-11-25 20:39:19,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:19,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:19,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:19,784 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:19,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:19,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080716750] [2021-11-25 20:39:19,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080716750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:19,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300440199] [2021-11-25 20:39:19,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:19,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:19,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:19,786 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:19,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:39:20,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:20,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:20,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:20,383 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:39:20,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:20,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300440199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:20,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:20,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:20,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833516319] [2021-11-25 20:39:20,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:20,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:20,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:20,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:20,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:20,388 INFO L87 Difference]: Start difference. First operand 12339 states and 19377 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:21,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:21,849 INFO L93 Difference]: Finished difference Result 33532 states and 52058 transitions. [2021-11-25 20:39:21,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:21,851 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:21,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:21,983 INFO L225 Difference]: With dead ends: 33532 [2021-11-25 20:39:21,983 INFO L226 Difference]: Without dead ends: 22839 [2021-11-25 20:39:22,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:22,043 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3509 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3509 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:22,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3509 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:22,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22839 states. [2021-11-25 20:39:23,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22839 to 22771. [2021-11-25 20:39:23,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22771 states, 19563 states have (on average 1.537954301487502) internal successors, (30087), 19630 states have internal predecessors, (30087), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-25 20:39:23,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22771 states to 22771 states and 34961 transitions. [2021-11-25 20:39:23,260 INFO L78 Accepts]: Start accepts. Automaton has 22771 states and 34961 transitions. Word has length 137 [2021-11-25 20:39:23,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:23,261 INFO L470 AbstractCegarLoop]: Abstraction has 22771 states and 34961 transitions. [2021-11-25 20:39:23,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:23,261 INFO L276 IsEmpty]: Start isEmpty. Operand 22771 states and 34961 transitions. [2021-11-25 20:39:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:23,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:23,318 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, 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] [2021-11-25 20:39:23,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:23,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:39:23,542 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:23,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:23,543 INFO L85 PathProgramCache]: Analyzing trace with hash -176781733, now seen corresponding path program 1 times [2021-11-25 20:39:23,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:23,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918837670] [2021-11-25 20:39:23,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:23,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:23,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:23,694 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:23,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:23,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918837670] [2021-11-25 20:39:23,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918837670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:23,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463713086] [2021-11-25 20:39:23,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:23,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:23,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:23,697 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:23,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:39:23,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:23,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:23,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:24,309 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:39:24,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:24,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463713086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:24,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:24,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:39:24,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287021595] [2021-11-25 20:39:24,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:24,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:24,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:24,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:24,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:24,312 INFO L87 Difference]: Start difference. First operand 22771 states and 34961 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:26,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:26,446 INFO L93 Difference]: Finished difference Result 64636 states and 99226 transitions. [2021-11-25 20:39:26,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:26,447 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 20:39:26,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:26,718 INFO L225 Difference]: With dead ends: 64636 [2021-11-25 20:39:26,718 INFO L226 Difference]: Without dead ends: 43511 [2021-11-25 20:39:26,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:26,825 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3521 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3521 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:26,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3521 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:26,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43511 states. [2021-11-25 20:39:28,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43511 to 43379. [2021-11-25 20:39:29,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43379 states, 37099 states have (on average 1.5131135610124262) internal successors, (56135), 37230 states have internal predecessors, (56135), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-25 20:39:29,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43379 states to 43379 states and 65617 transitions. [2021-11-25 20:39:29,426 INFO L78 Accepts]: Start accepts. Automaton has 43379 states and 65617 transitions. Word has length 137 [2021-11-25 20:39:29,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:29,427 INFO L470 AbstractCegarLoop]: Abstraction has 43379 states and 65617 transitions. [2021-11-25 20:39:29,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:39:29,427 INFO L276 IsEmpty]: Start isEmpty. Operand 43379 states and 65617 transitions. [2021-11-25 20:39:29,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 20:39:29,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:29,524 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, 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] [2021-11-25 20:39:29,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 20:39:29,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:29,750 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:29,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:29,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1543512891, now seen corresponding path program 1 times [2021-11-25 20:39:29,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:29,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745187025] [2021-11-25 20:39:29,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:29,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:29,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:29,908 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 20:39:29,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:29,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745187025] [2021-11-25 20:39:29,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745187025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:29,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:39:29,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:39:29,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875492683] [2021-11-25 20:39:29,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:29,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:39:29,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:29,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:39:29,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:39:29,911 INFO L87 Difference]: Start difference. First operand 43379 states and 65617 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 20:39:34,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:34,466 INFO L93 Difference]: Finished difference Result 147579 states and 220888 transitions. [2021-11-25 20:39:34,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:39:34,467 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-25 20:39:34,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:35,356 INFO L225 Difference]: With dead ends: 147579 [2021-11-25 20:39:35,357 INFO L226 Difference]: Without dead ends: 105847 [2021-11-25 20:39:35,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:39:35,535 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4350 mSDsluCounter, 10529 mSDsCounter, 0 mSdLazyCounter, 1223 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4371 SdHoareTripleChecker+Valid, 13094 SdHoareTripleChecker+Invalid, 1381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:35,536 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4371 Valid, 13094 Invalid, 1381 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [158 Valid, 1223 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 20:39:35,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105847 states. [2021-11-25 20:39:40,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105847 to 83571. [2021-11-25 20:39:40,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83571 states, 71275 states have (on average 1.4969484391441599) internal successors, (106695), 71534 states have internal predecessors, (106695), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-25 20:39:40,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83571 states to 83571 states and 125137 transitions. [2021-11-25 20:39:40,670 INFO L78 Accepts]: Start accepts. Automaton has 83571 states and 125137 transitions. Word has length 137 [2021-11-25 20:39:40,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:40,673 INFO L470 AbstractCegarLoop]: Abstraction has 83571 states and 125137 transitions. [2021-11-25 20:39:40,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 20:39:40,673 INFO L276 IsEmpty]: Start isEmpty. Operand 83571 states and 125137 transitions. [2021-11-25 20:39:40,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 20:39:40,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:40,812 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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, 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, 1] [2021-11-25 20:39:40,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 20:39:40,813 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:40,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:40,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1292982879, now seen corresponding path program 1 times [2021-11-25 20:39:40,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:40,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238179974] [2021-11-25 20:39:40,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:40,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:40,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:40,982 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:39:40,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:40,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238179974] [2021-11-25 20:39:40,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238179974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:40,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489104188] [2021-11-25 20:39:40,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:40,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:40,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:40,984 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:41,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:39:41,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:41,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:41,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:41,574 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-25 20:39:41,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:41,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489104188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:41,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:41,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:39:41,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408322552] [2021-11-25 20:39:41,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:41,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:41,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:41,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:41,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:39:41,577 INFO L87 Difference]: Start difference. First operand 83571 states and 125137 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 20:39:45,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:45,434 INFO L93 Difference]: Finished difference Result 147191 states and 223572 transitions. [2021-11-25 20:39:45,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:45,435 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 159 [2021-11-25 20:39:45,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:45,903 INFO L225 Difference]: With dead ends: 147191 [2021-11-25 20:39:45,904 INFO L226 Difference]: Without dead ends: 105203 [2021-11-25 20:39:46,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:39:46,057 INFO L933 BasicCegarLoop]: 3428 mSDtfsCounter, 125 mSDsluCounter, 3566 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 6738 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:46,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 6738 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:46,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105203 states. [2021-11-25 20:39:50,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105203 to 99315. [2021-11-25 20:39:50,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99315 states, 86507 states have (on average 1.5381761013559596) internal successors, (133063), 86766 states have internal predecessors, (133063), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2021-11-25 20:39:50,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99315 states to 99315 states and 152017 transitions. [2021-11-25 20:39:50,848 INFO L78 Accepts]: Start accepts. Automaton has 99315 states and 152017 transitions. Word has length 159 [2021-11-25 20:39:50,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:50,849 INFO L470 AbstractCegarLoop]: Abstraction has 99315 states and 152017 transitions. [2021-11-25 20:39:50,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 20:39:50,850 INFO L276 IsEmpty]: Start isEmpty. Operand 99315 states and 152017 transitions. [2021-11-25 20:39:51,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-25 20:39:51,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:51,152 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, 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] [2021-11-25 20:39:51,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:51,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:51,366 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:51,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:51,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1994373479, now seen corresponding path program 1 times [2021-11-25 20:39:51,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:51,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47973192] [2021-11-25 20:39:51,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:51,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:51,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:51,530 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-25 20:39:51,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:51,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47973192] [2021-11-25 20:39:51,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47973192] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:51,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661924896] [2021-11-25 20:39:51,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:51,531 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:51,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:51,532 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:51,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa7dd40c-1423-45c0-bdf3-836e76bb19f5/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:39:51,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:51,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 1320 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:39:51,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:52,339 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:39:52,339 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:39:52,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661924896] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:52,340 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:39:52,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-25 20:39:52,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968256757] [2021-11-25 20:39:52,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:52,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:39:52,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:52,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:39:52,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:39:52,343 INFO L87 Difference]: Start difference. First operand 99315 states and 152017 transitions. Second operand has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 20:39:59,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:59,686 INFO L93 Difference]: Finished difference Result 293116 states and 452570 transitions. [2021-11-25 20:39:59,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:39:59,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 209 [2021-11-25 20:39:59,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:00,531 INFO L225 Difference]: With dead ends: 293116 [2021-11-25 20:40:00,531 INFO L226 Difference]: Without dead ends: 195447 [2021-11-25 20:40:00,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:40:00,829 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3461 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3559 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:00,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3559 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:40:01,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195447 states.