./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label57.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label57.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs --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 0de0fd0b8cb0cee609d45117c8166ea2b32bbf1ee23893cc14af47ce8649a66b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 13:59:27,487 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:59:27,489 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:59:27,525 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:59:27,526 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:59:27,527 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:59:27,529 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:59:27,532 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:59:27,534 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:59:27,535 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:59:27,536 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:59:27,538 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:59:27,539 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:59:27,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:59:27,542 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:59:27,544 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:59:27,545 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:59:27,546 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:59:27,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:59:27,551 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:59:27,554 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:59:27,555 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:59:27,557 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:59:27,558 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:59:27,562 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:59:27,563 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:59:27,563 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:59:27,564 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:59:27,565 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:59:27,566 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:59:27,566 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:59:27,567 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:59:27,568 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:59:27,569 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:59:27,571 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:59:27,571 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:59:27,572 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:59:27,573 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:59:27,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:59:27,574 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:59:27,583 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:59:27,584 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 13:59:27,633 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:59:27,635 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:59:27,637 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:59:27,638 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:59:27,638 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:59:27,639 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:59:27,639 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:59:27,639 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 13:59:27,639 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:59:27,640 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:59:27,641 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 13:59:27,641 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 13:59:27,641 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:59:27,642 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 13:59:27,642 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 13:59:27,642 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 13:59:27,643 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:59:27,643 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:59:27,644 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:59:27,644 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:59:27,644 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:59:27,644 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 13:59:27,645 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:59:27,645 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 13:59:27,645 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 13:59:27,645 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:59:27,646 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 13:59:27,646 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:59:27,646 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 13:59:27,648 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:59:27,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:59:27,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:59:27,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:59:27,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:59:27,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 13:59:27,649 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 13:59:27,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 13:59:27,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 13:59:27,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:59:27,650 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:59:27,651 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_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0de0fd0b8cb0cee609d45117c8166ea2b32bbf1ee23893cc14af47ce8649a66b [2021-11-19 13:59:27,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:59:27,940 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:59:27,943 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:59:27,944 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:59:27,946 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:59:27,948 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/eca-rers2012/Problem03_label57.c [2021-11-19 13:59:28,017 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/data/4f06e27f8/0b057499cdb9468fb570f8adaa8dcea5/FLAGb0cced482 [2021-11-19 13:59:28,727 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:59:28,728 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/sv-benchmarks/c/eca-rers2012/Problem03_label57.c [2021-11-19 13:59:28,744 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/data/4f06e27f8/0b057499cdb9468fb570f8adaa8dcea5/FLAGb0cced482 [2021-11-19 13:59:28,899 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/data/4f06e27f8/0b057499cdb9468fb570f8adaa8dcea5 [2021-11-19 13:59:28,901 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:59:28,903 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:59:28,904 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:59:28,905 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:59:28,908 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:59:28,909 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:59:28" (1/1) ... [2021-11-19 13:59:28,910 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46524734 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:28, skipping insertion in model container [2021-11-19 13:59:28,911 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:59:28" (1/1) ... [2021-11-19 13:59:28,919 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:59:28,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:59:29,677 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_bb9874db-82f1-4024-994b-a77e0250172b/sv-benchmarks/c/eca-rers2012/Problem03_label57.c[55951,55964] [2021-11-19 13:59:29,725 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:59:29,736 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 13:59:30,080 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_bb9874db-82f1-4024-994b-a77e0250172b/sv-benchmarks/c/eca-rers2012/Problem03_label57.c[55951,55964] [2021-11-19 13:59:30,097 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:59:30,121 INFO L208 MainTranslator]: Completed translation [2021-11-19 13:59:30,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30 WrapperNode [2021-11-19 13:59:30,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:59:30,123 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 13:59:30,123 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 13:59:30,123 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 13:59:30,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,178 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,319 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-19 13:59:30,320 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 13:59:30,321 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 13:59:30,321 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 13:59:30,321 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 13:59:30,331 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,331 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,339 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,339 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,387 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,402 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,434 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 13:59:30,435 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 13:59:30,435 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 13:59:30,435 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 13:59:30,436 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (1/1) ... [2021-11-19 13:59:30,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:59:30,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:59:30,471 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 13:59:30,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 13:59:30,565 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 13:59:30,565 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 13:59:30,566 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 13:59:30,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 13:59:30,666 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 13:59:30,671 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 13:59:32,834 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 13:59:33,121 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 13:59:33,121 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-19 13:59:33,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:59:33 BoogieIcfgContainer [2021-11-19 13:59:33,126 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 13:59:33,128 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 13:59:33,128 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 13:59:33,132 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 13:59:33,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 01:59:28" (1/3) ... [2021-11-19 13:59:33,133 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24cd5ef4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:59:33, skipping insertion in model container [2021-11-19 13:59:33,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:59:30" (2/3) ... [2021-11-19 13:59:33,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24cd5ef4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:59:33, skipping insertion in model container [2021-11-19 13:59:33,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:59:33" (3/3) ... [2021-11-19 13:59:33,137 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label57.c [2021-11-19 13:59:33,147 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 13:59:33,148 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 13:59:33,219 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 13:59:33,229 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 [2021-11-19 13:59:33,229 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 13:59:33,264 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:33,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-19 13:59:33,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:33,280 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:33,281 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:33,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:33,287 INFO L85 PathProgramCache]: Analyzing trace with hash 209341367, now seen corresponding path program 1 times [2021-11-19 13:59:33,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:33,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599703586] [2021-11-19 13:59:33,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:33,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:33,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:33,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:59:33,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:33,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599703586] [2021-11-19 13:59:33,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599703586] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:33,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:33,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:33,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767295626] [2021-11-19 13:59:33,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:33,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:33,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:34,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:34,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:34,021 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:35,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:35,176 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-19 13:59:35,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:35,182 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-19 13:59:35,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:35,202 INFO L225 Difference]: With dead ends: 440 [2021-11-19 13:59:35,203 INFO L226 Difference]: Without dead ends: 289 [2021-11-19 13:59:35,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:35,213 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 38 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:35,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 51 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 13:59:35,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-19 13:59:35,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-19 13:59:35,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8090277777777777) internal successors, (521), 288 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:35,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 521 transitions. [2021-11-19 13:59:35,285 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 521 transitions. Word has length 143 [2021-11-19 13:59:35,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:35,287 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 521 transitions. [2021-11-19 13:59:35,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:35,288 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 521 transitions. [2021-11-19 13:59:35,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-19 13:59:35,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:35,294 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:35,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 13:59:35,295 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:35,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:35,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1094381654, now seen corresponding path program 1 times [2021-11-19 13:59:35,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:35,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203359758] [2021-11-19 13:59:35,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:35,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:35,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:35,454 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:59:35,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:35,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203359758] [2021-11-19 13:59:35,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203359758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:35,456 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:35,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:35,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013036969] [2021-11-19 13:59:35,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:35,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:35,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:35,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:35,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:35,460 INFO L87 Difference]: Start difference. First operand 289 states and 521 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:36,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:36,357 INFO L93 Difference]: Finished difference Result 863 states and 1560 transitions. [2021-11-19 13:59:36,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:36,359 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-19 13:59:36,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:36,365 INFO L225 Difference]: With dead ends: 863 [2021-11-19 13:59:36,365 INFO L226 Difference]: Without dead ends: 575 [2021-11-19 13:59:36,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:36,369 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:36,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 24 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 13:59:36,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-19 13:59:36,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-19 13:59:36,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.7665505226480835) internal successors, (1014), 574 states have internal predecessors, (1014), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:36,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1014 transitions. [2021-11-19 13:59:36,407 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1014 transitions. Word has length 151 [2021-11-19 13:59:36,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:36,408 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 1014 transitions. [2021-11-19 13:59:36,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:36,408 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1014 transitions. [2021-11-19 13:59:36,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-19 13:59:36,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:36,416 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:36,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 13:59:36,416 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:36,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:36,417 INFO L85 PathProgramCache]: Analyzing trace with hash -1988467699, now seen corresponding path program 1 times [2021-11-19 13:59:36,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:36,418 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74054548] [2021-11-19 13:59:36,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:36,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:36,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:36,507 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:59:36,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:36,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74054548] [2021-11-19 13:59:36,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74054548] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:36,510 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:36,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:36,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142499951] [2021-11-19 13:59:36,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:36,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:36,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:36,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:36,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:36,513 INFO L87 Difference]: Start difference. First operand 575 states and 1014 transitions. Second operand has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:37,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:37,360 INFO L93 Difference]: Finished difference Result 1723 states and 3040 transitions. [2021-11-19 13:59:37,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:37,361 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-19 13:59:37,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:37,370 INFO L225 Difference]: With dead ends: 1723 [2021-11-19 13:59:37,370 INFO L226 Difference]: Without dead ends: 1149 [2021-11-19 13:59:37,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:37,387 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 158 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:37,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 48 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:59:37,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-19 13:59:37,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-19 13:59:37,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.6404886561954626) internal successors, (1880), 1146 states have internal predecessors, (1880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:37,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1880 transitions. [2021-11-19 13:59:37,453 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1880 transitions. Word has length 156 [2021-11-19 13:59:37,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:37,455 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1880 transitions. [2021-11-19 13:59:37,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:37,456 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1880 transitions. [2021-11-19 13:59:37,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-19 13:59:37,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:37,462 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:37,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 13:59:37,462 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:37,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:37,464 INFO L85 PathProgramCache]: Analyzing trace with hash 2091059938, now seen corresponding path program 1 times [2021-11-19 13:59:37,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:37,465 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502447697] [2021-11-19 13:59:37,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:37,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:37,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:37,594 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:59:37,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:37,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502447697] [2021-11-19 13:59:37,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502447697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:37,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:37,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:37,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704378506] [2021-11-19 13:59:37,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:37,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:37,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:37,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:37,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:37,599 INFO L87 Difference]: Start difference. First operand 1147 states and 1880 transitions. Second operand has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:38,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:38,477 INFO L93 Difference]: Finished difference Result 2865 states and 4674 transitions. [2021-11-19 13:59:38,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:38,479 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 160 [2021-11-19 13:59:38,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:38,490 INFO L225 Difference]: With dead ends: 2865 [2021-11-19 13:59:38,491 INFO L226 Difference]: Without dead ends: 1719 [2021-11-19 13:59:38,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:38,494 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:38,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 36 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:59:38,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-19 13:59:38,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-19 13:59:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.5954598370197905) internal successors, (2741), 1718 states have internal predecessors, (2741), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:38,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2741 transitions. [2021-11-19 13:59:38,548 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2741 transitions. Word has length 160 [2021-11-19 13:59:38,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:38,548 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2741 transitions. [2021-11-19 13:59:38,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:38,549 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2741 transitions. [2021-11-19 13:59:38,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-19 13:59:38,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:38,558 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:38,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 13:59:38,558 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:38,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:38,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1051105795, now seen corresponding path program 1 times [2021-11-19 13:59:38,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:38,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897959514] [2021-11-19 13:59:38,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:38,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:38,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:38,633 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:59:38,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:38,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897959514] [2021-11-19 13:59:38,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897959514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:38,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:38,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:59:38,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824591910] [2021-11-19 13:59:38,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:38,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:38,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:38,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:38,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:38,637 INFO L87 Difference]: Start difference. First operand 1719 states and 2741 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:39,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:39,598 INFO L93 Difference]: Finished difference Result 5153 states and 8220 transitions. [2021-11-19 13:59:39,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:39,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2021-11-19 13:59:39,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:39,624 INFO L225 Difference]: With dead ends: 5153 [2021-11-19 13:59:39,624 INFO L226 Difference]: Without dead ends: 3435 [2021-11-19 13:59:39,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:39,629 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 149 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:39,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 263 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 13:59:39,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-19 13:59:39,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-19 13:59:39,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.3762376237623761) internal successors, (4726), 3434 states have internal predecessors, (4726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:39,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4726 transitions. [2021-11-19 13:59:39,771 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4726 transitions. Word has length 163 [2021-11-19 13:59:39,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:39,771 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4726 transitions. [2021-11-19 13:59:39,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:39,772 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4726 transitions. [2021-11-19 13:59:39,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-19 13:59:39,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:39,780 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:39,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-19 13:59:39,781 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:39,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:39,782 INFO L85 PathProgramCache]: Analyzing trace with hash -767511747, now seen corresponding path program 1 times [2021-11-19 13:59:39,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:39,783 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893226425] [2021-11-19 13:59:39,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:39,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:39,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:39,863 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:59:39,863 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:39,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893226425] [2021-11-19 13:59:39,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893226425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:39,864 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:39,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:59:39,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915546777] [2021-11-19 13:59:39,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:39,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:39,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:39,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:39,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:39,867 INFO L87 Difference]: Start difference. First operand 3435 states and 4726 transitions. Second operand has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:40,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:40,800 INFO L93 Difference]: Finished difference Result 10158 states and 14013 transitions. [2021-11-19 13:59:40,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:40,800 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 168 [2021-11-19 13:59:40,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:40,838 INFO L225 Difference]: With dead ends: 10158 [2021-11-19 13:59:40,838 INFO L226 Difference]: Without dead ends: 6724 [2021-11-19 13:59:40,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:40,846 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 150 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:40,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 76 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:59:40,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6724 states. [2021-11-19 13:59:40,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6724 to 6724. [2021-11-19 13:59:41,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6724 states, 6723 states have (on average 1.325747434181169) internal successors, (8913), 6723 states have internal predecessors, (8913), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:41,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6724 states to 6724 states and 8913 transitions. [2021-11-19 13:59:41,041 INFO L78 Accepts]: Start accepts. Automaton has 6724 states and 8913 transitions. Word has length 168 [2021-11-19 13:59:41,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:41,041 INFO L470 AbstractCegarLoop]: Abstraction has 6724 states and 8913 transitions. [2021-11-19 13:59:41,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:41,042 INFO L276 IsEmpty]: Start isEmpty. Operand 6724 states and 8913 transitions. [2021-11-19 13:59:41,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-19 13:59:41,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:41,076 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:41,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-19 13:59:41,077 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:41,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:41,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1304635397, now seen corresponding path program 1 times [2021-11-19 13:59:41,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:41,079 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809609728] [2021-11-19 13:59:41,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:41,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:41,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:41,188 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:59:41,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:41,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809609728] [2021-11-19 13:59:41,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809609728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:59:41,190 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52773180] [2021-11-19 13:59:41,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:41,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:59:41,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:59:41,195 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:59:41,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 13:59:41,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:41,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:59:41,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:59:41,984 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:59:41,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:59:42,504 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:59:42,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52773180] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:42,505 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:59:42,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-19 13:59:42,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581779147] [2021-11-19 13:59:42,506 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:42,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:42,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:42,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:42,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:59:42,512 INFO L87 Difference]: Start difference. First operand 6724 states and 8913 transitions. Second operand has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:43,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:43,444 INFO L93 Difference]: Finished difference Result 18881 states and 25078 transitions. [2021-11-19 13:59:43,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:43,445 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 191 [2021-11-19 13:59:43,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:43,547 INFO L225 Difference]: With dead ends: 18881 [2021-11-19 13:59:43,547 INFO L226 Difference]: Without dead ends: 12158 [2021-11-19 13:59:43,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 379 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:59:43,558 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:43,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 68 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:59:43,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12158 states. [2021-11-19 13:59:43,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12158 to 10156. [2021-11-19 13:59:43,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10156 states, 10155 states have (on average 1.363860167405219) internal successors, (13850), 10155 states have internal predecessors, (13850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:43,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10156 states to 10156 states and 13850 transitions. [2021-11-19 13:59:43,876 INFO L78 Accepts]: Start accepts. Automaton has 10156 states and 13850 transitions. Word has length 191 [2021-11-19 13:59:43,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:43,878 INFO L470 AbstractCegarLoop]: Abstraction has 10156 states and 13850 transitions. [2021-11-19 13:59:43,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:43,879 INFO L276 IsEmpty]: Start isEmpty. Operand 10156 states and 13850 transitions. [2021-11-19 13:59:43,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-19 13:59:43,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:43,901 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:43,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 13:59:44,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:59:44,118 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:44,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:44,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1769905284, now seen corresponding path program 1 times [2021-11-19 13:59:44,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:44,119 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119972463] [2021-11-19 13:59:44,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:44,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:44,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:44,288 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 13:59:44,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:44,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119972463] [2021-11-19 13:59:44,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119972463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:59:44,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937618406] [2021-11-19 13:59:44,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:44,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:59:44,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:59:44,294 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:59:44,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 13:59:44,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:44,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 13:59:44,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:59:44,908 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-19 13:59:44,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:59:45,412 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-19 13:59:45,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937618406] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:45,415 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:59:45,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [3] total 4 [2021-11-19 13:59:45,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93249081] [2021-11-19 13:59:45,416 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:45,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:45,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:45,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:45,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:59:45,420 INFO L87 Difference]: Start difference. First operand 10156 states and 13850 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:45,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:45,929 INFO L93 Difference]: Finished difference Result 20025 states and 27314 transitions. [2021-11-19 13:59:45,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:45,930 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-11-19 13:59:45,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:45,953 INFO L225 Difference]: With dead ends: 20025 [2021-11-19 13:59:45,953 INFO L226 Difference]: Without dead ends: 9870 [2021-11-19 13:59:45,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 396 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:59:45,968 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:45,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:59:45,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9870 states. [2021-11-19 13:59:46,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9870 to 9870. [2021-11-19 13:59:46,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9870 states, 9869 states have (on average 1.3426892288985712) internal successors, (13251), 9869 states have internal predecessors, (13251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:46,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9870 states to 9870 states and 13251 transitions. [2021-11-19 13:59:46,216 INFO L78 Accepts]: Start accepts. Automaton has 9870 states and 13251 transitions. Word has length 199 [2021-11-19 13:59:46,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:46,216 INFO L470 AbstractCegarLoop]: Abstraction has 9870 states and 13251 transitions. [2021-11-19 13:59:46,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:46,217 INFO L276 IsEmpty]: Start isEmpty. Operand 9870 states and 13251 transitions. [2021-11-19 13:59:46,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-19 13:59:46,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:46,240 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:46,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 13:59:46,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-19 13:59:46,460 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:46,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:46,461 INFO L85 PathProgramCache]: Analyzing trace with hash 671400459, now seen corresponding path program 1 times [2021-11-19 13:59:46,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:46,461 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090619228] [2021-11-19 13:59:46,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:46,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:46,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:46,565 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-19 13:59:46,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:46,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090619228] [2021-11-19 13:59:46,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090619228] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:46,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:46,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:46,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164527099] [2021-11-19 13:59:46,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:46,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:46,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:46,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:46,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:46,569 INFO L87 Difference]: Start difference. First operand 9870 states and 13251 transitions. Second operand has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 2 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:47,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:47,104 INFO L93 Difference]: Finished difference Result 29036 states and 38974 transitions. [2021-11-19 13:59:47,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:47,122 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 2 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 205 [2021-11-19 13:59:47,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:47,163 INFO L225 Difference]: With dead ends: 29036 [2021-11-19 13:59:47,163 INFO L226 Difference]: Without dead ends: 19167 [2021-11-19 13:59:47,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:47,174 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 202 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:47,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 307 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 13:59:47,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19167 states. [2021-11-19 13:59:47,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19167 to 19165. [2021-11-19 13:59:47,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19165 states, 19164 states have (on average 1.3410039657691506) internal successors, (25699), 19164 states have internal predecessors, (25699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:47,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19165 states to 19165 states and 25699 transitions. [2021-11-19 13:59:47,709 INFO L78 Accepts]: Start accepts. Automaton has 19165 states and 25699 transitions. Word has length 205 [2021-11-19 13:59:47,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:47,709 INFO L470 AbstractCegarLoop]: Abstraction has 19165 states and 25699 transitions. [2021-11-19 13:59:47,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 2 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:47,710 INFO L276 IsEmpty]: Start isEmpty. Operand 19165 states and 25699 transitions. [2021-11-19 13:59:47,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-19 13:59:47,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:47,746 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:47,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 13:59:47,746 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:47,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:47,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1105197501, now seen corresponding path program 1 times [2021-11-19 13:59:47,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:47,747 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892208864] [2021-11-19 13:59:47,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:47,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:47,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:47,952 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:59:47,952 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:47,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892208864] [2021-11-19 13:59:47,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892208864] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:47,953 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:47,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:59:47,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867518724] [2021-11-19 13:59:47,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:47,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:59:47,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:47,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:59:47,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:59:47,955 INFO L87 Difference]: Start difference. First operand 19165 states and 25699 transitions. Second operand has 4 states, 4 states have (on average 49.75) internal successors, (199), 3 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:49,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:49,470 INFO L93 Difference]: Finished difference Result 74083 states and 99335 transitions. [2021-11-19 13:59:49,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:59:49,471 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 49.75) internal successors, (199), 3 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 210 [2021-11-19 13:59:49,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:49,618 INFO L225 Difference]: With dead ends: 74083 [2021-11-19 13:59:49,618 INFO L226 Difference]: Without dead ends: 54919 [2021-11-19 13:59:49,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:59:49,763 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 580 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 580 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:49,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [580 Valid, 149 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 13:59:49,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54919 states. [2021-11-19 13:59:50,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54919 to 54915. [2021-11-19 13:59:50,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54915 states, 54914 states have (on average 1.3385111264886913) internal successors, (73503), 54914 states have internal predecessors, (73503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:51,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54915 states to 54915 states and 73503 transitions. [2021-11-19 13:59:51,270 INFO L78 Accepts]: Start accepts. Automaton has 54915 states and 73503 transitions. Word has length 210 [2021-11-19 13:59:51,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:51,270 INFO L470 AbstractCegarLoop]: Abstraction has 54915 states and 73503 transitions. [2021-11-19 13:59:51,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 49.75) internal successors, (199), 3 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:51,271 INFO L276 IsEmpty]: Start isEmpty. Operand 54915 states and 73503 transitions. [2021-11-19 13:59:51,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-19 13:59:51,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:51,306 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:51,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 13:59:51,307 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:51,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:51,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1073742191, now seen corresponding path program 1 times [2021-11-19 13:59:51,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:51,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046865031] [2021-11-19 13:59:51,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:51,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:51,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:59:51,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:51,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046865031] [2021-11-19 13:59:51,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046865031] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:51,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:51,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:59:51,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868143073] [2021-11-19 13:59:51,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:51,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:51,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:51,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:51,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:51,537 INFO L87 Difference]: Start difference. First operand 54915 states and 73503 transitions. Second operand has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 3 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:53,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:53,022 INFO L93 Difference]: Finished difference Result 120983 states and 162448 transitions. [2021-11-19 13:59:53,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:53,023 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 3 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-19 13:59:53,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:53,313 INFO L225 Difference]: With dead ends: 120983 [2021-11-19 13:59:53,314 INFO L226 Difference]: Without dead ends: 66069 [2021-11-19 13:59:53,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:53,387 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 167 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:53,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 225 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:59:53,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66069 states. [2021-11-19 13:59:54,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66069 to 66069. [2021-11-19 13:59:54,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66069 states, 66068 states have (on average 1.279772355754677) internal successors, (84552), 66068 states have internal predecessors, (84552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:54,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66069 states to 66069 states and 84552 transitions. [2021-11-19 13:59:54,668 INFO L78 Accepts]: Start accepts. Automaton has 66069 states and 84552 transitions. Word has length 213 [2021-11-19 13:59:54,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:54,669 INFO L470 AbstractCegarLoop]: Abstraction has 66069 states and 84552 transitions. [2021-11-19 13:59:54,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 3 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:54,670 INFO L276 IsEmpty]: Start isEmpty. Operand 66069 states and 84552 transitions. [2021-11-19 13:59:54,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-19 13:59:54,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:54,702 INFO L514 BasicCegarLoop]: trace histogram [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, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:54,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 13:59:54,702 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:54,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:54,703 INFO L85 PathProgramCache]: Analyzing trace with hash -228285263, now seen corresponding path program 1 times [2021-11-19 13:59:54,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:54,704 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762092860] [2021-11-19 13:59:54,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:54,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:54,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:55,078 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:59:55,078 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:55,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762092860] [2021-11-19 13:59:55,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762092860] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:55,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:59:55,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:59:55,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948121974] [2021-11-19 13:59:55,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:55,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:55,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:55,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:55,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:55,081 INFO L87 Difference]: Start difference. First operand 66069 states and 84552 transitions. Second operand has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:56,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:59:56,435 INFO L93 Difference]: Finished difference Result 143005 states and 181688 transitions. [2021-11-19 13:59:56,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:59:56,436 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-19 13:59:56,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:59:56,735 INFO L225 Difference]: With dead ends: 143005 [2021-11-19 13:59:56,735 INFO L226 Difference]: Without dead ends: 76937 [2021-11-19 13:59:56,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:59:56,791 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 89 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 13:59:56,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 88 Invalid, 518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 13:59:56,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76937 states. [2021-11-19 13:59:58,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76937 to 76937. [2021-11-19 13:59:58,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76937 states, 76936 states have (on average 1.2590854736404284) internal successors, (96869), 76936 states have internal predecessors, (96869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:58,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76937 states to 76937 states and 96869 transitions. [2021-11-19 13:59:58,423 INFO L78 Accepts]: Start accepts. Automaton has 76937 states and 96869 transitions. Word has length 213 [2021-11-19 13:59:58,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:59:58,423 INFO L470 AbstractCegarLoop]: Abstraction has 76937 states and 96869 transitions. [2021-11-19 13:59:58,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:59:58,424 INFO L276 IsEmpty]: Start isEmpty. Operand 76937 states and 96869 transitions. [2021-11-19 13:59:58,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-19 13:59:58,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:59:58,451 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:59:58,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-19 13:59:58,452 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:59:58,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:59:58,453 INFO L85 PathProgramCache]: Analyzing trace with hash 1589104502, now seen corresponding path program 2 times [2021-11-19 13:59:58,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:59:58,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71418827] [2021-11-19 13:59:58,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:59:58,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:59:58,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:59:58,617 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 82 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:59:58,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:59:58,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71418827] [2021-11-19 13:59:58,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71418827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:59:58,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578527747] [2021-11-19 13:59:58,618 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:59:58,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:59:58,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:59:58,619 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:59:58,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 13:59:58,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-19 13:59:58,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:59:58,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 13:59:58,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:59:59,279 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-19 13:59:59,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:59:59,683 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-19 13:59:59,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578527747] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:59:59,683 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:59:59,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-19 13:59:59,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254819202] [2021-11-19 13:59:59,684 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:59:59,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:59:59,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:59:59,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:59:59,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:59:59,686 INFO L87 Difference]: Start difference. First operand 76937 states and 96869 transitions. Second operand has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 3 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:01,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:00:01,237 INFO L93 Difference]: Finished difference Result 185333 states and 231846 transitions. [2021-11-19 14:00:01,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:00:01,237 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 3 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 220 [2021-11-19 14:00:01,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:00:01,381 INFO L225 Difference]: With dead ends: 185333 [2021-11-19 14:00:01,381 INFO L226 Difference]: Without dead ends: 108397 [2021-11-19 14:00:01,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:01,431 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 14:00:01,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 80 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 14:00:01,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108397 states. [2021-11-19 14:00:03,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108397 to 76794. [2021-11-19 14:00:03,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76794 states, 76793 states have (on average 1.2571067675439167) internal successors, (96537), 76793 states have internal predecessors, (96537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:03,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76794 states to 76794 states and 96537 transitions. [2021-11-19 14:00:03,395 INFO L78 Accepts]: Start accepts. Automaton has 76794 states and 96537 transitions. Word has length 220 [2021-11-19 14:00:03,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:00:03,396 INFO L470 AbstractCegarLoop]: Abstraction has 76794 states and 96537 transitions. [2021-11-19 14:00:03,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 3 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:03,396 INFO L276 IsEmpty]: Start isEmpty. Operand 76794 states and 96537 transitions. [2021-11-19 14:00:03,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-19 14:00:03,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:00:03,431 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:00:03,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 14:00:03,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:03,648 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:00:03,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:00:03,648 INFO L85 PathProgramCache]: Analyzing trace with hash 232077563, now seen corresponding path program 1 times [2021-11-19 14:00:03,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:00:03,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641396411] [2021-11-19 14:00:03,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:03,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:00:03,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:03,762 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 108 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-19 14:00:03,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:00:03,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641396411] [2021-11-19 14:00:03,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641396411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:00:03,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946140514] [2021-11-19 14:00:03,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:03,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:03,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:00:03,765 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:00:03,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 14:00:03,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:03,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:00:03,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:00:04,342 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 14:00:04,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:00:04,824 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 14:00:04,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946140514] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:00:04,825 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:00:04,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-19 14:00:04,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071154460] [2021-11-19 14:00:04,826 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:00:04,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:00:04,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:00:04,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:00:04,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:04,829 INFO L87 Difference]: Start difference. First operand 76794 states and 96537 transitions. Second operand has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:06,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:00:06,466 INFO L93 Difference]: Finished difference Result 181186 states and 229619 transitions. [2021-11-19 14:00:06,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:00:06,467 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 240 [2021-11-19 14:00:06,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:00:06,602 INFO L225 Difference]: With dead ends: 181186 [2021-11-19 14:00:06,602 INFO L226 Difference]: Without dead ends: 104393 [2021-11-19 14:00:06,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 477 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:06,641 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 132 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:00:06,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 86 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 14:00:06,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104393 states. [2021-11-19 14:00:08,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104393 to 104393. [2021-11-19 14:00:08,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104393 states, 104392 states have (on average 1.2119319488083378) internal successors, (126516), 104392 states have internal predecessors, (126516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:08,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104393 states to 104393 states and 126516 transitions. [2021-11-19 14:00:08,814 INFO L78 Accepts]: Start accepts. Automaton has 104393 states and 126516 transitions. Word has length 240 [2021-11-19 14:00:08,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:00:08,815 INFO L470 AbstractCegarLoop]: Abstraction has 104393 states and 126516 transitions. [2021-11-19 14:00:08,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:08,815 INFO L276 IsEmpty]: Start isEmpty. Operand 104393 states and 126516 transitions. [2021-11-19 14:00:08,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-19 14:00:08,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:00:08,851 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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] [2021-11-19 14:00:08,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-19 14:00:09,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-19 14:00:09,052 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:00:09,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:00:09,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1739247494, now seen corresponding path program 1 times [2021-11-19 14:00:09,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:00:09,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422165467] [2021-11-19 14:00:09,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:09,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:00:09,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:09,348 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:00:09,349 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:00:09,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422165467] [2021-11-19 14:00:09,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422165467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:00:09,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095938549] [2021-11-19 14:00:09,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:09,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:09,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:00:09,351 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:00:09,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 14:00:09,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:09,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 14:00:09,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:00:10,785 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 14:00:10,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:00:12,299 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 14:00:12,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095938549] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:00:12,300 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:00:12,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2021-11-19 14:00:12,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718949660] [2021-11-19 14:00:12,301 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:00:12,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:00:12,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:00:12,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:00:12,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:00:12,303 INFO L87 Difference]: Start difference. First operand 104393 states and 126516 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:13,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:00:13,792 INFO L93 Difference]: Finished difference Result 213933 states and 259692 transitions. [2021-11-19 14:00:13,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:00:13,792 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2021-11-19 14:00:13,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:00:13,961 INFO L225 Difference]: With dead ends: 213933 [2021-11-19 14:00:13,962 INFO L226 Difference]: Without dead ends: 109541 [2021-11-19 14:00:14,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:00:14,018 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 14:00:14,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 24 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 14:00:14,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109541 states. [2021-11-19 14:00:16,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109541 to 104679. [2021-11-19 14:00:16,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104679 states, 104678 states have (on average 1.2169414776743919) internal successors, (127387), 104678 states have internal predecessors, (127387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:16,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104679 states to 104679 states and 127387 transitions. [2021-11-19 14:00:16,314 INFO L78 Accepts]: Start accepts. Automaton has 104679 states and 127387 transitions. Word has length 271 [2021-11-19 14:00:16,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:00:16,315 INFO L470 AbstractCegarLoop]: Abstraction has 104679 states and 127387 transitions. [2021-11-19 14:00:16,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:16,315 INFO L276 IsEmpty]: Start isEmpty. Operand 104679 states and 127387 transitions. [2021-11-19 14:00:16,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-19 14:00:16,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:00:16,356 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 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, 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] [2021-11-19 14:00:16,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 14:00:16,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-19 14:00:16,581 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:00:16,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:00:16,581 INFO L85 PathProgramCache]: Analyzing trace with hash -545395987, now seen corresponding path program 1 times [2021-11-19 14:00:16,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:00:16,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491957602] [2021-11-19 14:00:16,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:16,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:00:16,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 148 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 14:00:16,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:00:16,849 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491957602] [2021-11-19 14:00:16,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491957602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:00:16,849 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447937439] [2021-11-19 14:00:16,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:16,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:16,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:00:16,854 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:00:16,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 14:00:17,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:17,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:00:17,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:00:18,902 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 160 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 14:00:18,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:00:20,531 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 160 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 14:00:20,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447937439] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:00:20,532 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:00:20,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 4 [2021-11-19 14:00:20,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465707638] [2021-11-19 14:00:20,533 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:00:20,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:00:20,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:00:20,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:00:20,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:20,542 INFO L87 Difference]: Start difference. First operand 104679 states and 127387 transitions. Second operand has 4 states, 4 states have (on average 71.25) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:22,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:00:22,679 INFO L93 Difference]: Finished difference Result 303739 states and 369023 transitions. [2021-11-19 14:00:22,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:00:22,679 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 71.25) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 292 [2021-11-19 14:00:22,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:00:22,999 INFO L225 Difference]: With dead ends: 303739 [2021-11-19 14:00:22,999 INFO L226 Difference]: Without dead ends: 199061 [2021-11-19 14:00:23,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 585 GetRequests, 582 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:23,054 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 565 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 14:00:23,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 8 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 14:00:23,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199061 states. [2021-11-19 14:00:26,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199061 to 199059. [2021-11-19 14:00:26,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199059 states, 199058 states have (on average 1.2131388841443198) internal successors, (241485), 199058 states have internal predecessors, (241485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:27,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199059 states to 199059 states and 241485 transitions. [2021-11-19 14:00:27,425 INFO L78 Accepts]: Start accepts. Automaton has 199059 states and 241485 transitions. Word has length 292 [2021-11-19 14:00:27,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:00:27,426 INFO L470 AbstractCegarLoop]: Abstraction has 199059 states and 241485 transitions. [2021-11-19 14:00:27,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 71.25) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:27,427 INFO L276 IsEmpty]: Start isEmpty. Operand 199059 states and 241485 transitions. [2021-11-19 14:00:27,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2021-11-19 14:00:27,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:00:27,466 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1] [2021-11-19 14:00:27,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 14:00:27,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:27,667 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:00:27,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:00:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash -2047734973, now seen corresponding path program 1 times [2021-11-19 14:00:27,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:00:27,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80713298] [2021-11-19 14:00:27,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:27,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:00:27,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:27,845 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 138 proven. 6 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-19 14:00:27,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:00:27,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80713298] [2021-11-19 14:00:27,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80713298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:00:27,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218939901] [2021-11-19 14:00:27,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:27,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:27,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:00:27,850 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:00:27,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 14:00:28,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:28,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 14:00:28,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:00:28,955 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-19 14:00:28,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:00:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-19 14:00:30,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218939901] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:00:30,945 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:00:30,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-19 14:00:30,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454442712] [2021-11-19 14:00:30,946 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:00:30,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:00:30,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:00:30,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:00:30,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:00:30,948 INFO L87 Difference]: Start difference. First operand 199059 states and 241485 transitions. Second operand has 4 states, 4 states have (on average 69.5) internal successors, (278), 4 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:34,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:00:34,670 INFO L93 Difference]: Finished difference Result 492068 states and 592818 transitions. [2021-11-19 14:00:34,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:00:34,671 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 69.5) internal successors, (278), 4 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 315 [2021-11-19 14:00:34,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:00:35,108 INFO L225 Difference]: With dead ends: 492068 [2021-11-19 14:00:35,109 INFO L226 Difference]: Without dead ends: 293010 [2021-11-19 14:00:35,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 627 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:00:35,194 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 165 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:00:35,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 73 Invalid, 992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-19 14:00:35,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293010 states. [2021-11-19 14:00:40,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293010 to 277280. [2021-11-19 14:00:40,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277280 states, 277279 states have (on average 1.1852285964678175) internal successors, (328639), 277279 states have internal predecessors, (328639), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:41,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277280 states to 277280 states and 328639 transitions. [2021-11-19 14:00:41,518 INFO L78 Accepts]: Start accepts. Automaton has 277280 states and 328639 transitions. Word has length 315 [2021-11-19 14:00:41,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:00:41,518 INFO L470 AbstractCegarLoop]: Abstraction has 277280 states and 328639 transitions. [2021-11-19 14:00:41,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 69.5) internal successors, (278), 4 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:00:41,519 INFO L276 IsEmpty]: Start isEmpty. Operand 277280 states and 328639 transitions. [2021-11-19 14:00:41,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-19 14:00:41,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:00:41,576 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 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, 3, 3, 3, 3, 3, 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] [2021-11-19 14:00:41,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-19 14:00:41,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-19 14:00:41,777 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:00:41,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:00:41,778 INFO L85 PathProgramCache]: Analyzing trace with hash -1234446498, now seen corresponding path program 1 times [2021-11-19 14:00:41,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:00:41,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300912170] [2021-11-19 14:00:41,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:41,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:00:41,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:41,967 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 198 proven. 3 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-19 14:00:41,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:00:41,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300912170] [2021-11-19 14:00:41,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300912170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:00:41,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805401990] [2021-11-19 14:00:41,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:00:41,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:00:41,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:00:41,970 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:00:41,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb9874db-82f1-4024-994b-a77e0250172b/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 14:00:42,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:00:42,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:00:42,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:00:42,966 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 193 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-19 14:00:42,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:00:43,723 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 193 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-19 14:00:43,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805401990] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:00:43,724 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:00:43,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-19 14:00:43,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487822670] [2021-11-19 14:00:43,724 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:00:43,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:00:43,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:00:43,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:00:43,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:00:43,726 INFO L87 Difference]: Start difference. First operand 277280 states and 328639 transitions. Second operand has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)