./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8 --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 075767edbb592d061c1d85f41edb41733b674c2f33a2c1741ae50b9eba126551 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:02:28,533 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:02:28,537 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:02:28,593 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:02:28,594 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:02:28,598 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:02:28,600 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:02:28,604 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:02:28,607 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:02:28,613 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:02:28,615 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:02:28,616 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:02:28,617 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:02:28,620 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:02:28,622 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:02:28,627 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:02:28,629 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:02:28,631 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:02:28,633 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:02:28,641 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:02:28,643 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:02:28,645 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:02:28,648 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:02:28,650 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:02:28,659 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:02:28,659 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:02:28,660 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:02:28,662 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:02:28,662 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:02:28,664 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:02:28,664 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:02:28,665 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:02:28,667 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:02:28,669 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:02:28,671 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:02:28,671 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:02:28,672 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:02:28,672 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:02:28,672 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:02:28,673 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:02:28,674 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:02:28,675 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:02:28,716 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:02:28,716 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:02:28,719 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:02:28,719 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:02:28,719 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:02:28,720 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:02:28,720 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:02:28,720 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:02:28,720 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:02:28,720 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:02:28,722 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:02:28,722 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:02:28,722 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:02:28,722 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:02:28,723 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:02:28,723 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:02:28,724 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:02:28,724 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:02:28,724 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:02:28,724 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:02:28,725 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:02:28,725 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:02:28,725 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:02:28,725 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:02:28,725 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:02:28,726 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:02:28,726 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:02:28,726 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:02:28,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:02:28,728 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:02:28,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:02:28,729 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:02:28,729 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:02:28,729 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:02:28,730 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:02:28,730 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:02:28,730 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:02:28,730 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:02:28,730 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:02:28,731 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_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 075767edbb592d061c1d85f41edb41733b674c2f33a2c1741ae50b9eba126551 [2021-11-07 02:02:29,004 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:02:29,030 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:02:29,032 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:02:29,033 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:02:29,034 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:02:29,035 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2021-11-07 02:02:29,107 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/data/4a08b675b/5545cad1fc55407c8c739ffc25201694/FLAG5ba0ce889 [2021-11-07 02:02:29,744 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:02:29,747 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2021-11-07 02:02:29,778 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/data/4a08b675b/5545cad1fc55407c8c739ffc25201694/FLAG5ba0ce889 [2021-11-07 02:02:30,046 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/data/4a08b675b/5545cad1fc55407c8c739ffc25201694 [2021-11-07 02:02:30,048 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:02:30,049 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:02:30,051 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:02:30,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:02:30,054 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:02:30,055 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26ab7e1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30, skipping insertion in model container [2021-11-07 02:02:30,057 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,064 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:02:30,110 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:02:30,431 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c[6780,6793] [2021-11-07 02:02:30,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:02:30,507 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:02:30,607 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c[6780,6793] [2021-11-07 02:02:30,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:02:30,694 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:02:30,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30 WrapperNode [2021-11-07 02:02:30,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:02:30,696 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:02:30,696 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:02:30,696 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:02:30,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,727 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,781 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:02:30,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:02:30,789 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:02:30,789 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:02:30,798 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,799 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,815 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,825 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,844 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,853 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,857 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:02:30,858 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:02:30,865 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:02:30,865 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:02:30,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (1/1) ... [2021-11-07 02:02:30,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:02:30,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:02:30,904 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:02:30,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:02:30,955 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 02:02:30,956 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:02:30,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:02:30,956 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:02:31,998 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:02:31,999 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 02:02:32,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:02:32 BoogieIcfgContainer [2021-11-07 02:02:32,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:02:32,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:02:32,004 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:02:32,007 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:02:32,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:02:30" (1/3) ... [2021-11-07 02:02:32,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34897a0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:02:32, skipping insertion in model container [2021-11-07 02:02:32,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:30" (2/3) ... [2021-11-07 02:02:32,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34897a0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:02:32, skipping insertion in model container [2021-11-07 02:02:32,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:02:32" (3/3) ... [2021-11-07 02:02:32,011 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2021-11-07 02:02:32,016 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:02:32,016 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 02:02:32,075 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:02:32,086 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 [2021-11-07 02:02:32,088 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 02:02:32,112 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 86 states have (on average 1.755813953488372) internal successors, (151), 87 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) [2021-11-07 02:02:32,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 02:02:32,121 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:32,122 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:32,122 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:32,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:32,142 INFO L85 PathProgramCache]: Analyzing trace with hash -708270994, now seen corresponding path program 1 times [2021-11-07 02:02:32,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:32,157 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098381534] [2021-11-07 02:02:32,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:32,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:32,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:32,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:32,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:32,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098381534] [2021-11-07 02:02:32,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098381534] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:32,641 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:32,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:02:32,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782886739] [2021-11-07 02:02:32,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:02:32,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:32,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:02:32,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:02:32,665 INFO L87 Difference]: Start difference. First operand has 88 states, 86 states have (on average 1.755813953488372) internal successors, (151), 87 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) Second operand has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 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) [2021-11-07 02:02:32,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:32,875 INFO L93 Difference]: Finished difference Result 143 states and 233 transitions. [2021-11-07 02:02:32,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:02:32,876 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 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 53 [2021-11-07 02:02:32,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:32,889 INFO L225 Difference]: With dead ends: 143 [2021-11-07 02:02:32,889 INFO L226 Difference]: Without dead ends: 86 [2021-11-07 02:02:32,895 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:02:32,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-07 02:02:32,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-07 02:02:32,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.2117647058823529) internal successors, (103), 85 states have internal predecessors, (103), 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) [2021-11-07 02:02:32,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 103 transitions. [2021-11-07 02:02:32,957 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 103 transitions. Word has length 53 [2021-11-07 02:02:32,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:32,958 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 103 transitions. [2021-11-07 02:02:32,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 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) [2021-11-07 02:02:32,958 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 103 transitions. [2021-11-07 02:02:32,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 02:02:32,962 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:32,962 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:32,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 02:02:32,963 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:32,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:32,966 INFO L85 PathProgramCache]: Analyzing trace with hash -716717722, now seen corresponding path program 1 times [2021-11-07 02:02:32,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:32,967 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454462837] [2021-11-07 02:02:32,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:32,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:33,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:33,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:33,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:33,159 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454462837] [2021-11-07 02:02:33,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454462837] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:33,159 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:33,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:02:33,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832579903] [2021-11-07 02:02:33,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:02:33,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:33,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:02:33,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:02:33,166 INFO L87 Difference]: Start difference. First operand 86 states and 103 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 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) [2021-11-07 02:02:33,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:33,312 INFO L93 Difference]: Finished difference Result 131 states and 162 transitions. [2021-11-07 02:02:33,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:02:33,313 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 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 54 [2021-11-07 02:02:33,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:33,316 INFO L225 Difference]: With dead ends: 131 [2021-11-07 02:02:33,316 INFO L226 Difference]: Without dead ends: 86 [2021-11-07 02:02:33,318 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:02:33,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-07 02:02:33,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-07 02:02:33,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.188235294117647) internal successors, (101), 85 states have internal predecessors, (101), 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) [2021-11-07 02:02:33,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 101 transitions. [2021-11-07 02:02:33,336 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 101 transitions. Word has length 54 [2021-11-07 02:02:33,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:33,336 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 101 transitions. [2021-11-07 02:02:33,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 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) [2021-11-07 02:02:33,337 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 101 transitions. [2021-11-07 02:02:33,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 02:02:33,341 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:33,342 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:33,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 02:02:33,342 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:33,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:33,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1441521250, now seen corresponding path program 1 times [2021-11-07 02:02:33,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:33,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846368718] [2021-11-07 02:02:33,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:33,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:33,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:33,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:33,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:33,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846368718] [2021-11-07 02:02:33,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846368718] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:33,506 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:33,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:02:33,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130769150] [2021-11-07 02:02:33,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:02:33,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:33,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:02:33,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:02:33,516 INFO L87 Difference]: Start difference. First operand 86 states and 101 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 4 states have internal predecessors, (55), 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) [2021-11-07 02:02:33,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:33,626 INFO L93 Difference]: Finished difference Result 139 states and 167 transitions. [2021-11-07 02:02:33,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:02:33,627 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 4 states have internal predecessors, (55), 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 55 [2021-11-07 02:02:33,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:33,631 INFO L225 Difference]: With dead ends: 139 [2021-11-07 02:02:33,631 INFO L226 Difference]: Without dead ends: 86 [2021-11-07 02:02:33,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:02:33,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-07 02:02:33,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-07 02:02:33,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1647058823529413) internal successors, (99), 85 states have internal predecessors, (99), 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) [2021-11-07 02:02:33,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 99 transitions. [2021-11-07 02:02:33,654 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 99 transitions. Word has length 55 [2021-11-07 02:02:33,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:33,656 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 99 transitions. [2021-11-07 02:02:33,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 4 states have internal predecessors, (55), 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) [2021-11-07 02:02:33,657 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 99 transitions. [2021-11-07 02:02:33,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 02:02:33,658 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:33,658 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:33,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 02:02:33,660 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:33,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:33,661 INFO L85 PathProgramCache]: Analyzing trace with hash 398155598, now seen corresponding path program 1 times [2021-11-07 02:02:33,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:33,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959282939] [2021-11-07 02:02:33,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:33,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:33,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:33,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:33,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:33,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959282939] [2021-11-07 02:02:33,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959282939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:33,770 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:33,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:02:33,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175361533] [2021-11-07 02:02:33,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:02:33,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:33,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:02:33,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:02:33,774 INFO L87 Difference]: Start difference. First operand 86 states and 99 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:33,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:33,887 INFO L93 Difference]: Finished difference Result 143 states and 168 transitions. [2021-11-07 02:02:33,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:02:33,888 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-07 02:02:33,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:33,889 INFO L225 Difference]: With dead ends: 143 [2021-11-07 02:02:33,889 INFO L226 Difference]: Without dead ends: 86 [2021-11-07 02:02:33,891 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:02:33,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-07 02:02:33,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-07 02:02:33,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1529411764705881) internal successors, (98), 85 states have internal predecessors, (98), 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) [2021-11-07 02:02:33,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 98 transitions. [2021-11-07 02:02:33,907 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 98 transitions. Word has length 56 [2021-11-07 02:02:33,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:33,908 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 98 transitions. [2021-11-07 02:02:33,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:33,910 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 98 transitions. [2021-11-07 02:02:33,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 02:02:33,916 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:33,916 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:33,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 02:02:33,917 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:33,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:33,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1830601558, now seen corresponding path program 1 times [2021-11-07 02:02:33,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:33,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685400330] [2021-11-07 02:02:33,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:33,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:34,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:37,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:37,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685400330] [2021-11-07 02:02:37,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685400330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:37,876 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:37,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-11-07 02:02:37,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047012325] [2021-11-07 02:02:37,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-07 02:02:37,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:37,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-07 02:02:37,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-11-07 02:02:37,879 INFO L87 Difference]: Start difference. First operand 86 states and 98 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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) [2021-11-07 02:02:42,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:42,489 INFO L93 Difference]: Finished difference Result 216 states and 272 transitions. [2021-11-07 02:02:42,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:02:42,490 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 57 [2021-11-07 02:02:42,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:42,493 INFO L225 Difference]: With dead ends: 216 [2021-11-07 02:02:42,493 INFO L226 Difference]: Without dead ends: 182 [2021-11-07 02:02:42,495 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=624, Invalid=1826, Unknown=0, NotChecked=0, Total=2450 [2021-11-07 02:02:42,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-07 02:02:42,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 115. [2021-11-07 02:02:42,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.2017543859649122) internal successors, (137), 114 states have internal predecessors, (137), 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) [2021-11-07 02:02:42,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 137 transitions. [2021-11-07 02:02:42,513 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 137 transitions. Word has length 57 [2021-11-07 02:02:42,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:42,513 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 137 transitions. [2021-11-07 02:02:42,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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) [2021-11-07 02:02:42,514 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 137 transitions. [2021-11-07 02:02:42,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 02:02:42,515 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:42,515 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:42,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 02:02:42,515 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:42,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:42,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1455449387, now seen corresponding path program 1 times [2021-11-07 02:02:42,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:42,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032798111] [2021-11-07 02:02:42,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:42,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:42,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:42,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:42,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:42,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032798111] [2021-11-07 02:02:42,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032798111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:42,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:42,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:02:42,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259355119] [2021-11-07 02:02:42,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:02:42,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:42,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:02:42,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:02:42,608 INFO L87 Difference]: Start difference. First operand 115 states and 137 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:42,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:42,650 INFO L93 Difference]: Finished difference Result 241 states and 307 transitions. [2021-11-07 02:02:42,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:02:42,651 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 02:02:42,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:42,652 INFO L225 Difference]: With dead ends: 241 [2021-11-07 02:02:42,653 INFO L226 Difference]: Without dead ends: 178 [2021-11-07 02:02:42,653 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:02:42,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-07 02:02:42,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2021-11-07 02:02:42,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.2571428571428571) internal successors, (220), 175 states have internal predecessors, (220), 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) [2021-11-07 02:02:42,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 220 transitions. [2021-11-07 02:02:42,676 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 220 transitions. Word has length 59 [2021-11-07 02:02:42,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:42,676 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 220 transitions. [2021-11-07 02:02:42,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 220 transitions. [2021-11-07 02:02:42,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 02:02:42,677 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:42,678 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:42,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 02:02:42,678 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:42,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:42,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1615516430, now seen corresponding path program 1 times [2021-11-07 02:02:42,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:42,679 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799559488] [2021-11-07 02:02:42,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:42,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:42,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:47,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:47,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:47,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799559488] [2021-11-07 02:02:47,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799559488] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:47,583 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:47,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-11-07 02:02:47,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978179470] [2021-11-07 02:02:47,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-07 02:02:47,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:47,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-07 02:02:47,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2021-11-07 02:02:47,585 INFO L87 Difference]: Start difference. First operand 176 states and 220 transitions. Second operand has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:56,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:56,105 INFO L93 Difference]: Finished difference Result 426 states and 551 transitions. [2021-11-07 02:02:56,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-07 02:02:56,106 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 02:02:56,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:56,108 INFO L225 Difference]: With dead ends: 426 [2021-11-07 02:02:56,108 INFO L226 Difference]: Without dead ends: 302 [2021-11-07 02:02:56,110 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=761, Invalid=2431, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 02:02:56,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-11-07 02:02:56,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 266. [2021-11-07 02:02:56,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.2830188679245282) internal successors, (340), 265 states have internal predecessors, (340), 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) [2021-11-07 02:02:56,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 340 transitions. [2021-11-07 02:02:56,149 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 340 transitions. Word has length 59 [2021-11-07 02:02:56,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:56,149 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 340 transitions. [2021-11-07 02:02:56,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:02:56,150 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 340 transitions. [2021-11-07 02:02:56,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 02:02:56,150 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:56,150 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:56,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 02:02:56,151 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:56,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:56,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1449901951, now seen corresponding path program 1 times [2021-11-07 02:02:56,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:56,152 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278210933] [2021-11-07 02:02:56,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:56,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:56,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:56,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:56,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:56,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278210933] [2021-11-07 02:02:56,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278210933] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:56,220 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:56,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 02:02:56,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182536666] [2021-11-07 02:02:56,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:02:56,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:56,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:02:56,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:02:56,222 INFO L87 Difference]: Start difference. First operand 266 states and 340 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 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) [2021-11-07 02:02:56,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:56,464 INFO L93 Difference]: Finished difference Result 489 states and 638 transitions. [2021-11-07 02:02:56,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:02:56,473 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-07 02:02:56,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:56,476 INFO L225 Difference]: With dead ends: 489 [2021-11-07 02:02:56,476 INFO L226 Difference]: Without dead ends: 394 [2021-11-07 02:02:56,477 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:02:56,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-11-07 02:02:56,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 233. [2021-11-07 02:02:56,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 232 states have (on average 1.2629310344827587) internal successors, (293), 232 states have internal predecessors, (293), 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) [2021-11-07 02:02:56,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 293 transitions. [2021-11-07 02:02:56,538 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 293 transitions. Word has length 60 [2021-11-07 02:02:56,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:56,538 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 293 transitions. [2021-11-07 02:02:56,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 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) [2021-11-07 02:02:56,539 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 293 transitions. [2021-11-07 02:02:56,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:02:56,539 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:56,540 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:02:56,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 02:02:56,540 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:56,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:56,541 INFO L85 PathProgramCache]: Analyzing trace with hash 334007693, now seen corresponding path program 1 times [2021-11-07 02:02:56,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:56,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66243572] [2021-11-07 02:02:56,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:56,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:56,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:56,642 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:56,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:56,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66243572] [2021-11-07 02:02:56,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66243572] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:56,645 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:56,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:02:56,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404259660] [2021-11-07 02:02:56,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:02:56,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:56,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:02:56,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:56,654 INFO L87 Difference]: Start difference. First operand 233 states and 293 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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) [2021-11-07 02:02:56,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:56,709 INFO L93 Difference]: Finished difference Result 446 states and 581 transitions. [2021-11-07 02:02:56,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:02:56,710 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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 73 [2021-11-07 02:02:56,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:56,712 INFO L225 Difference]: With dead ends: 446 [2021-11-07 02:02:56,713 INFO L226 Difference]: Without dead ends: 292 [2021-11-07 02:02:56,713 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:56,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-11-07 02:02:56,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 274. [2021-11-07 02:02:56,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 273 states have (on average 1.2637362637362637) internal successors, (345), 273 states have internal predecessors, (345), 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) [2021-11-07 02:02:56,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 345 transitions. [2021-11-07 02:02:56,760 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 345 transitions. Word has length 73 [2021-11-07 02:02:56,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:56,760 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 345 transitions. [2021-11-07 02:02:56,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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) [2021-11-07 02:02:56,761 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 345 transitions. [2021-11-07 02:02:56,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 02:02:56,762 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:56,762 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:02:56,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 02:02:56,763 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:56,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:56,763 INFO L85 PathProgramCache]: Analyzing trace with hash -1494358663, now seen corresponding path program 1 times [2021-11-07 02:02:56,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:56,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917845974] [2021-11-07 02:02:56,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:56,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:56,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:56,835 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 02:02:56,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:56,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917845974] [2021-11-07 02:02:56,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917845974] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:56,836 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:56,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:02:56,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727679472] [2021-11-07 02:02:56,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:02:56,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:56,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:02:56,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:56,838 INFO L87 Difference]: Start difference. First operand 274 states and 345 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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) [2021-11-07 02:02:56,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:56,921 INFO L93 Difference]: Finished difference Result 625 states and 815 transitions. [2021-11-07 02:02:56,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:02:56,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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 92 [2021-11-07 02:02:56,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:56,925 INFO L225 Difference]: With dead ends: 625 [2021-11-07 02:02:56,925 INFO L226 Difference]: Without dead ends: 422 [2021-11-07 02:02:56,926 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:56,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-11-07 02:02:56,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 396. [2021-11-07 02:02:56,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 395 states have (on average 1.2835443037974683) internal successors, (507), 395 states have internal predecessors, (507), 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) [2021-11-07 02:02:57,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 507 transitions. [2021-11-07 02:02:57,001 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 507 transitions. Word has length 92 [2021-11-07 02:02:57,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:57,002 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 507 transitions. [2021-11-07 02:02:57,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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) [2021-11-07 02:02:57,002 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 507 transitions. [2021-11-07 02:02:57,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 02:02:57,007 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:57,007 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:02:57,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 02:02:57,007 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:57,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:57,008 INFO L85 PathProgramCache]: Analyzing trace with hash -881285348, now seen corresponding path program 1 times [2021-11-07 02:02:57,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:57,008 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56125588] [2021-11-07 02:02:57,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:57,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:57,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:57,071 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:02:57,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:57,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56125588] [2021-11-07 02:02:57,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56125588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:57,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:57,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:02:57,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367331681] [2021-11-07 02:02:57,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:02:57,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:57,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:02:57,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:57,074 INFO L87 Difference]: Start difference. First operand 396 states and 507 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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) [2021-11-07 02:02:57,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:57,189 INFO L93 Difference]: Finished difference Result 1003 states and 1319 transitions. [2021-11-07 02:02:57,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:02:57,190 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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 95 [2021-11-07 02:02:57,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:57,195 INFO L225 Difference]: With dead ends: 1003 [2021-11-07 02:02:57,195 INFO L226 Difference]: Without dead ends: 684 [2021-11-07 02:02:57,196 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:57,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2021-11-07 02:02:57,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 646. [2021-11-07 02:02:57,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 646 states, 645 states have (on average 1.2992248062015503) internal successors, (838), 645 states have internal predecessors, (838), 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) [2021-11-07 02:02:57,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 646 states to 646 states and 838 transitions. [2021-11-07 02:02:57,298 INFO L78 Accepts]: Start accepts. Automaton has 646 states and 838 transitions. Word has length 95 [2021-11-07 02:02:57,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:57,299 INFO L470 AbstractCegarLoop]: Abstraction has 646 states and 838 transitions. [2021-11-07 02:02:57,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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) [2021-11-07 02:02:57,299 INFO L276 IsEmpty]: Start isEmpty. Operand 646 states and 838 transitions. [2021-11-07 02:02:57,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 02:02:57,300 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:57,301 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-07 02:02:57,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 02:02:57,301 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:57,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:57,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1603593750, now seen corresponding path program 1 times [2021-11-07 02:02:57,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:57,302 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616163954] [2021-11-07 02:02:57,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:57,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:57,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:57,383 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 02:02:57,383 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:57,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616163954] [2021-11-07 02:02:57,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616163954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:57,384 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:57,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:02:57,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094400603] [2021-11-07 02:02:57,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:02:57,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:57,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:02:57,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:57,386 INFO L87 Difference]: Start difference. First operand 646 states and 838 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-07 02:02:57,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:57,569 INFO L93 Difference]: Finished difference Result 1769 states and 2335 transitions. [2021-11-07 02:02:57,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:02:57,570 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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 98 [2021-11-07 02:02:57,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:57,577 INFO L225 Difference]: With dead ends: 1769 [2021-11-07 02:02:57,578 INFO L226 Difference]: Without dead ends: 1202 [2021-11-07 02:02:57,579 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:02:57,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1202 states. [2021-11-07 02:02:57,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1202 to 1117. [2021-11-07 02:02:57,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1117 states, 1116 states have (on average 1.310035842293907) internal successors, (1462), 1116 states have internal predecessors, (1462), 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) [2021-11-07 02:02:57,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1117 states to 1117 states and 1462 transitions. [2021-11-07 02:02:57,762 INFO L78 Accepts]: Start accepts. Automaton has 1117 states and 1462 transitions. Word has length 98 [2021-11-07 02:02:57,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:57,762 INFO L470 AbstractCegarLoop]: Abstraction has 1117 states and 1462 transitions. [2021-11-07 02:02:57,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-07 02:02:57,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1117 states and 1462 transitions. [2021-11-07 02:02:57,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-07 02:02:57,764 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:57,764 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-07 02:02:57,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 02:02:57,764 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:57,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:57,765 INFO L85 PathProgramCache]: Analyzing trace with hash 568515399, now seen corresponding path program 1 times [2021-11-07 02:02:57,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:57,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309415732] [2021-11-07 02:02:57,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:57,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:57,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:57,877 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-07 02:02:57,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:57,878 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309415732] [2021-11-07 02:02:57,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309415732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:02:57,878 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:02:57,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 02:02:57,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23197011] [2021-11-07 02:02:57,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:02:57,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:57,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:02:57,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:02:57,880 INFO L87 Difference]: Start difference. First operand 1117 states and 1462 transitions. Second operand has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 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) [2021-11-07 02:02:58,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:58,172 INFO L93 Difference]: Finished difference Result 2178 states and 2868 transitions. [2021-11-07 02:02:58,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:02:58,172 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 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 101 [2021-11-07 02:02:58,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:58,179 INFO L225 Difference]: With dead ends: 2178 [2021-11-07 02:02:58,179 INFO L226 Difference]: Without dead ends: 1117 [2021-11-07 02:02:58,180 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:02:58,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1117 states. [2021-11-07 02:02:58,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1117 to 1117. [2021-11-07 02:02:58,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1117 states, 1116 states have (on average 1.2741935483870968) internal successors, (1422), 1116 states have internal predecessors, (1422), 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) [2021-11-07 02:02:58,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1117 states to 1117 states and 1422 transitions. [2021-11-07 02:02:58,359 INFO L78 Accepts]: Start accepts. Automaton has 1117 states and 1422 transitions. Word has length 101 [2021-11-07 02:02:58,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:58,360 INFO L470 AbstractCegarLoop]: Abstraction has 1117 states and 1422 transitions. [2021-11-07 02:02:58,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 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) [2021-11-07 02:02:58,360 INFO L276 IsEmpty]: Start isEmpty. Operand 1117 states and 1422 transitions. [2021-11-07 02:02:58,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-07 02:02:58,361 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:58,362 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-07 02:02:58,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 02:02:58,362 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:58,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:58,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1382828500, now seen corresponding path program 1 times [2021-11-07 02:02:58,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:58,363 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768145950] [2021-11-07 02:02:58,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:58,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:58,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:49,508 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:03:49,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:03:49,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768145950] [2021-11-07 02:03:49,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768145950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:03:49,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437183391] [2021-11-07 02:03:49,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:49,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:03:49,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:03:49,511 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:03:49,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56850fc8-ce2a-449e-b14d-cad2c7cbe936/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 02:03:50,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:50,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-07 02:03:50,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:08,904 WARN L207 SmtUtils]: Spent 1.40 m on a formula simplification. DAG size of input: 180 DAG size of output: 173 [2021-11-07 02:13:21,158 WARN L207 SmtUtils]: Spent 2.93 m on a formula simplification. DAG size of input: 17727 DAG size of output: 16826