./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.07.cil-2.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_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/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_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.07.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/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_fc096fa8-d195-4f89-85d9-566bafc72048/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 32b030e5f1b46150870f8dd8e24821389f0ffe4175e43053767dc9109bffcf9b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:30:29,670 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:30:29,672 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:30:29,718 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:30:29,719 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:30:29,720 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:30:29,722 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:30:29,725 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:30:29,728 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:30:29,729 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:30:29,730 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:30:29,732 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:30:29,733 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:30:29,734 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:30:29,736 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:30:29,738 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:30:29,739 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:30:29,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:30:29,743 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:30:29,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:30:29,748 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:30:29,750 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:30:29,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:30:29,753 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:30:29,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:30:29,757 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:30:29,758 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:30:29,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:30:29,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:30:29,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:30:29,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:30:29,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:30:29,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:30:29,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:30:29,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:30:29,766 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:30:29,767 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:30:29,768 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:30:29,768 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:30:29,769 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:30:29,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:30:29,771 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:30:29,798 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:30:29,799 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:30:29,800 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:30:29,800 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:30:29,801 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:30:29,801 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:30:29,802 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:30:29,802 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:30:29,802 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:30:29,803 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:30:29,803 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:30:29,803 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:30:29,804 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:30:29,804 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:30:29,804 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:30:29,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:30:29,806 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:30:29,806 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:30:29,806 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:30:29,806 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:30:29,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:30:29,807 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:30:29,807 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:30:29,807 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:30:29,807 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:30:29,808 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:30:29,808 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:30:29,808 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:30:29,808 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:30:29,809 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:30:29,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:30:29,809 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:30:29,809 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:30:29,810 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:30:29,810 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:30:29,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:30:29,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:30:29,811 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:30:29,811 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:30:29,811 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_fc096fa8-d195-4f89-85d9-566bafc72048/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 32b030e5f1b46150870f8dd8e24821389f0ffe4175e43053767dc9109bffcf9b [2021-11-07 01:30:30,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:30:30,080 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:30:30,083 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:30:30,085 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:30:30,085 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:30:30,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/systemc/token_ring.07.cil-2.c [2021-11-07 01:30:30,153 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/data/ced03dab7/34cb97f46d074ae18c1550e1079df1c7/FLAG6e9e8b22f [2021-11-07 01:30:30,683 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:30:30,683 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/sv-benchmarks/c/systemc/token_ring.07.cil-2.c [2021-11-07 01:30:30,697 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/data/ced03dab7/34cb97f46d074ae18c1550e1079df1c7/FLAG6e9e8b22f [2021-11-07 01:30:31,022 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/data/ced03dab7/34cb97f46d074ae18c1550e1079df1c7 [2021-11-07 01:30:31,025 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:30:31,026 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:30:31,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:30:31,028 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:30:31,043 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:30:31,044 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,046 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f289756 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31, skipping insertion in model container [2021-11-07 01:30:31,047 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:30:31,103 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:30:31,291 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_fc096fa8-d195-4f89-85d9-566bafc72048/sv-benchmarks/c/systemc/token_ring.07.cil-2.c[671,684] [2021-11-07 01:30:31,432 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:30:31,442 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:30:31,452 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_fc096fa8-d195-4f89-85d9-566bafc72048/sv-benchmarks/c/systemc/token_ring.07.cil-2.c[671,684] [2021-11-07 01:30:31,511 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:30:31,542 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:30:31,542 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31 WrapperNode [2021-11-07 01:30:31,542 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:30:31,544 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:30:31,544 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:30:31,544 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:30:31,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,582 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,678 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:30:31,679 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:30:31,679 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:30:31,679 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:30:31,688 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,688 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,696 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,696 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,730 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,765 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,785 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,794 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:30:31,795 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:30:31,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:30:31,796 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:30:31,805 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (1/1) ... [2021-11-07 01:30:31,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:30:31,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:30:31,839 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:30:31,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc096fa8-d195-4f89-85d9-566bafc72048/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:30:31,891 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:30:31,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:30:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:30:31,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:30:35,693 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:30:35,694 INFO L299 CfgBuilder]: Removed 280 assume(true) statements. [2021-11-07 01:30:35,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:30:35 BoogieIcfgContainer [2021-11-07 01:30:35,699 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:30:35,703 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:30:35,703 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:30:35,706 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:30:35,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:30:31" (1/3) ... [2021-11-07 01:30:35,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233c59d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:30:35, skipping insertion in model container [2021-11-07 01:30:35,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:31" (2/3) ... [2021-11-07 01:30:35,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233c59d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:30:35, skipping insertion in model container [2021-11-07 01:30:35,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:30:35" (3/3) ... [2021-11-07 01:30:35,712 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.07.cil-2.c [2021-11-07 01:30:35,717 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:30:35,718 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:30:35,792 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:30:35,801 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 01:30:35,801 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:30:35,834 INFO L276 IsEmpty]: Start isEmpty. Operand has 410 states, 407 states have (on average 1.5405405405405406) internal successors, (627), 409 states have internal predecessors, (627), 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 01:30:35,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 01:30:35,840 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:35,841 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] [2021-11-07 01:30:35,842 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:35,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:35,847 INFO L85 PathProgramCache]: Analyzing trace with hash -249940357, now seen corresponding path program 1 times [2021-11-07 01:30:35,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:35,855 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383278907] [2021-11-07 01:30:35,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:35,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:35,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:36,054 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 01:30:36,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:36,055 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383278907] [2021-11-07 01:30:36,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383278907] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:36,056 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:36,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:36,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270563903] [2021-11-07 01:30:36,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:36,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:36,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:36,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:36,081 INFO L87 Difference]: Start difference. First operand has 410 states, 407 states have (on average 1.5405405405405406) internal successors, (627), 409 states have internal predecessors, (627), 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 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 01:30:36,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:36,381 INFO L93 Difference]: Finished difference Result 1497 states and 2279 transitions. [2021-11-07 01:30:36,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:36,383 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 34 [2021-11-07 01:30:36,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:36,403 INFO L225 Difference]: With dead ends: 1497 [2021-11-07 01:30:36,403 INFO L226 Difference]: Without dead ends: 1083 [2021-11-07 01:30:36,409 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:30:36,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1083 states. [2021-11-07 01:30:36,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1083 to 1020. [2021-11-07 01:30:36,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1020 states, 1018 states have (on average 1.4911591355599214) internal successors, (1518), 1019 states have internal predecessors, (1518), 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 01:30:36,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1020 states to 1020 states and 1518 transitions. [2021-11-07 01:30:36,506 INFO L78 Accepts]: Start accepts. Automaton has 1020 states and 1518 transitions. Word has length 34 [2021-11-07 01:30:36,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:36,506 INFO L470 AbstractCegarLoop]: Abstraction has 1020 states and 1518 transitions. [2021-11-07 01:30:36,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 01:30:36,507 INFO L276 IsEmpty]: Start isEmpty. Operand 1020 states and 1518 transitions. [2021-11-07 01:30:36,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 01:30:36,511 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:36,511 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] [2021-11-07 01:30:36,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:30:36,512 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:36,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:36,512 INFO L85 PathProgramCache]: Analyzing trace with hash -363698324, now seen corresponding path program 1 times [2021-11-07 01:30:36,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:36,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310977905] [2021-11-07 01:30:36,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:36,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:36,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:36,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:30:36,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:36,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310977905] [2021-11-07 01:30:36,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310977905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:36,606 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:36,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:36,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546348877] [2021-11-07 01:30:36,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:36,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:36,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:36,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:36,615 INFO L87 Difference]: Start difference. First operand 1020 states and 1518 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 01:30:36,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:36,910 INFO L93 Difference]: Finished difference Result 3796 states and 5629 transitions. [2021-11-07 01:30:36,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:36,911 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 47 [2021-11-07 01:30:36,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:36,927 INFO L225 Difference]: With dead ends: 3796 [2021-11-07 01:30:36,927 INFO L226 Difference]: Without dead ends: 2788 [2021-11-07 01:30:36,929 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:30:36,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2788 states. [2021-11-07 01:30:37,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2788 to 2653. [2021-11-07 01:30:37,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2653 states, 2651 states have (on average 1.4590720482836665) internal successors, (3868), 2652 states have internal predecessors, (3868), 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 01:30:37,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2653 states to 2653 states and 3868 transitions. [2021-11-07 01:30:37,042 INFO L78 Accepts]: Start accepts. Automaton has 2653 states and 3868 transitions. Word has length 47 [2021-11-07 01:30:37,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:37,042 INFO L470 AbstractCegarLoop]: Abstraction has 2653 states and 3868 transitions. [2021-11-07 01:30:37,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 01:30:37,044 INFO L276 IsEmpty]: Start isEmpty. Operand 2653 states and 3868 transitions. [2021-11-07 01:30:37,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 01:30:37,052 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:37,052 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] [2021-11-07 01:30:37,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:30:37,053 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:37,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:37,064 INFO L85 PathProgramCache]: Analyzing trace with hash 432319422, now seen corresponding path program 1 times [2021-11-07 01:30:37,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:37,066 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649139883] [2021-11-07 01:30:37,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:37,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:37,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:37,174 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:30:37,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:37,175 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649139883] [2021-11-07 01:30:37,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649139883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:37,175 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:37,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:37,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765022447] [2021-11-07 01:30:37,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:37,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:37,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:37,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:37,177 INFO L87 Difference]: Start difference. First operand 2653 states and 3868 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 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 01:30:37,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:37,635 INFO L93 Difference]: Finished difference Result 9940 states and 14436 transitions. [2021-11-07 01:30:37,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:37,636 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 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 50 [2021-11-07 01:30:37,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:37,682 INFO L225 Difference]: With dead ends: 9940 [2021-11-07 01:30:37,682 INFO L226 Difference]: Without dead ends: 7302 [2021-11-07 01:30:37,691 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:30:37,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7302 states. [2021-11-07 01:30:37,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7302 to 7000. [2021-11-07 01:30:38,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7000 states, 6998 states have (on average 1.4281223206630467) internal successors, (9994), 6999 states have internal predecessors, (9994), 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 01:30:38,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7000 states to 7000 states and 9994 transitions. [2021-11-07 01:30:38,041 INFO L78 Accepts]: Start accepts. Automaton has 7000 states and 9994 transitions. Word has length 50 [2021-11-07 01:30:38,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:38,042 INFO L470 AbstractCegarLoop]: Abstraction has 7000 states and 9994 transitions. [2021-11-07 01:30:38,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 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 01:30:38,042 INFO L276 IsEmpty]: Start isEmpty. Operand 7000 states and 9994 transitions. [2021-11-07 01:30:38,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:30:38,045 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:38,046 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] [2021-11-07 01:30:38,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:30:38,046 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:38,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:38,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1553302213, now seen corresponding path program 1 times [2021-11-07 01:30:38,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:38,047 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196376939] [2021-11-07 01:30:38,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:38,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:38,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:38,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:30:38,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:38,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196376939] [2021-11-07 01:30:38,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196376939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:38,115 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:38,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 01:30:38,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544002503] [2021-11-07 01:30:38,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:30:38,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:38,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:30:38,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:30:38,117 INFO L87 Difference]: Start difference. First operand 7000 states and 9994 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 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 01:30:38,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:38,644 INFO L93 Difference]: Finished difference Result 19987 states and 28499 transitions. [2021-11-07 01:30:38,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:30:38,644 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 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 01:30:38,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:38,718 INFO L225 Difference]: With dead ends: 19987 [2021-11-07 01:30:38,718 INFO L226 Difference]: Without dead ends: 13009 [2021-11-07 01:30:38,729 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:30:38,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13009 states. [2021-11-07 01:30:39,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13009 to 12978. [2021-11-07 01:30:39,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12978 states, 12976 states have (on average 1.410681257706535) internal successors, (18305), 12977 states have internal predecessors, (18305), 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 01:30:39,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12978 states to 12978 states and 18305 transitions. [2021-11-07 01:30:39,371 INFO L78 Accepts]: Start accepts. Automaton has 12978 states and 18305 transitions. Word has length 53 [2021-11-07 01:30:39,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:39,372 INFO L470 AbstractCegarLoop]: Abstraction has 12978 states and 18305 transitions. [2021-11-07 01:30:39,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 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 01:30:39,374 INFO L276 IsEmpty]: Start isEmpty. Operand 12978 states and 18305 transitions. [2021-11-07 01:30:39,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:30:39,380 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:39,380 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] [2021-11-07 01:30:39,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:30:39,380 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:39,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:39,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1113014810, now seen corresponding path program 1 times [2021-11-07 01:30:39,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:39,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59020644] [2021-11-07 01:30:39,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:39,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:39,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:39,536 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:39,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:39,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59020644] [2021-11-07 01:30:39,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59020644] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:39,538 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:39,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:39,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180387716] [2021-11-07 01:30:39,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:39,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:39,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:39,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:39,540 INFO L87 Difference]: Start difference. First operand 12978 states and 18305 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 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 01:30:40,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:40,467 INFO L93 Difference]: Finished difference Result 37589 states and 53162 transitions. [2021-11-07 01:30:40,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:40,468 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 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 01:30:40,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:40,568 INFO L225 Difference]: With dead ends: 37589 [2021-11-07 01:30:40,568 INFO L226 Difference]: Without dead ends: 24639 [2021-11-07 01:30:40,590 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 01:30:40,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24639 states. [2021-11-07 01:30:41,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24639 to 19046. [2021-11-07 01:30:41,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19046 states, 19044 states have (on average 1.414618777567738) internal successors, (26940), 19045 states have internal predecessors, (26940), 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 01:30:41,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19046 states to 19046 states and 26940 transitions. [2021-11-07 01:30:41,460 INFO L78 Accepts]: Start accepts. Automaton has 19046 states and 26940 transitions. Word has length 53 [2021-11-07 01:30:41,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:41,461 INFO L470 AbstractCegarLoop]: Abstraction has 19046 states and 26940 transitions. [2021-11-07 01:30:41,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 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 01:30:41,461 INFO L276 IsEmpty]: Start isEmpty. Operand 19046 states and 26940 transitions. [2021-11-07 01:30:41,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:30:41,466 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:41,467 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] [2021-11-07 01:30:41,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:30:41,467 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:41,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:41,468 INFO L85 PathProgramCache]: Analyzing trace with hash 1380530961, now seen corresponding path program 1 times [2021-11-07 01:30:41,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:41,469 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409574502] [2021-11-07 01:30:41,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:41,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:41,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:41,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:41,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409574502] [2021-11-07 01:30:41,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409574502] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:41,602 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:41,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:41,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578754011] [2021-11-07 01:30:41,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:41,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:41,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:41,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:41,611 INFO L87 Difference]: Start difference. First operand 19046 states and 26940 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 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 01:30:43,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:43,201 INFO L93 Difference]: Finished difference Result 69474 states and 98107 transitions. [2021-11-07 01:30:43,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:43,202 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 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 01:30:43,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:43,336 INFO L225 Difference]: With dead ends: 69474 [2021-11-07 01:30:43,336 INFO L226 Difference]: Without dead ends: 50456 [2021-11-07 01:30:43,366 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 01:30:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50456 states. [2021-11-07 01:30:44,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50456 to 35390. [2021-11-07 01:30:44,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35390 states, 35388 states have (on average 1.4142082061715835) internal successors, (50046), 35389 states have internal predecessors, (50046), 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 01:30:44,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35390 states to 35390 states and 50046 transitions. [2021-11-07 01:30:44,862 INFO L78 Accepts]: Start accepts. Automaton has 35390 states and 50046 transitions. Word has length 54 [2021-11-07 01:30:44,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:44,863 INFO L470 AbstractCegarLoop]: Abstraction has 35390 states and 50046 transitions. [2021-11-07 01:30:44,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 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 01:30:44,864 INFO L276 IsEmpty]: Start isEmpty. Operand 35390 states and 50046 transitions. [2021-11-07 01:30:44,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:30:44,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:44,872 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] [2021-11-07 01:30:44,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:30:44,872 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:44,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:44,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1153860499, now seen corresponding path program 1 times [2021-11-07 01:30:44,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:44,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25527980] [2021-11-07 01:30:44,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:44,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:44,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:44,944 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:44,944 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:44,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25527980] [2021-11-07 01:30:44,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25527980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:44,945 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:44,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:44,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606545272] [2021-11-07 01:30:44,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:30:44,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:44,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:30:44,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:30:44,948 INFO L87 Difference]: Start difference. First operand 35390 states and 50046 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 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 01:30:46,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:46,212 INFO L93 Difference]: Finished difference Result 78433 states and 111977 transitions. [2021-11-07 01:30:46,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:30:46,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 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 01:30:46,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:46,298 INFO L225 Difference]: With dead ends: 78433 [2021-11-07 01:30:46,298 INFO L226 Difference]: Without dead ends: 43071 [2021-11-07 01:30:46,341 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 01:30:46,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43071 states. [2021-11-07 01:30:47,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43071 to 40304. [2021-11-07 01:30:47,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40304 states, 40302 states have (on average 1.452136370403454) internal successors, (58524), 40303 states have internal predecessors, (58524), 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 01:30:47,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40304 states to 40304 states and 58524 transitions. [2021-11-07 01:30:47,965 INFO L78 Accepts]: Start accepts. Automaton has 40304 states and 58524 transitions. Word has length 55 [2021-11-07 01:30:47,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:47,965 INFO L470 AbstractCegarLoop]: Abstraction has 40304 states and 58524 transitions. [2021-11-07 01:30:47,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 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 01:30:47,966 INFO L276 IsEmpty]: Start isEmpty. Operand 40304 states and 58524 transitions. [2021-11-07 01:30:47,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 01:30:47,978 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:47,979 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:30:47,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:30:47,979 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:47,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:47,980 INFO L85 PathProgramCache]: Analyzing trace with hash 276676084, now seen corresponding path program 1 times [2021-11-07 01:30:47,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:47,980 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422461207] [2021-11-07 01:30:47,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:47,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:48,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:48,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:30:48,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:48,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422461207] [2021-11-07 01:30:48,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422461207] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:48,062 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:48,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 01:30:48,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054496780] [2021-11-07 01:30:48,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:30:48,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:48,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:30:48,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:30:48,064 INFO L87 Difference]: Start difference. First operand 40304 states and 58524 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 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 01:30:49,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:49,388 INFO L93 Difference]: Finished difference Result 68672 states and 100522 transitions. [2021-11-07 01:30:49,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:30:49,389 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 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 56 [2021-11-07 01:30:49,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:49,482 INFO L225 Difference]: With dead ends: 68672 [2021-11-07 01:30:49,482 INFO L226 Difference]: Without dead ends: 54106 [2021-11-07 01:30:49,514 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:30:49,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54106 states. [2021-11-07 01:30:50,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54106 to 26960. [2021-11-07 01:30:50,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26960 states, 26958 states have (on average 1.4726611766451516) internal successors, (39700), 26959 states have internal predecessors, (39700), 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 01:30:50,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26960 states to 26960 states and 39700 transitions. [2021-11-07 01:30:50,586 INFO L78 Accepts]: Start accepts. Automaton has 26960 states and 39700 transitions. Word has length 56 [2021-11-07 01:30:50,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:50,586 INFO L470 AbstractCegarLoop]: Abstraction has 26960 states and 39700 transitions. [2021-11-07 01:30:50,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 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 01:30:50,587 INFO L276 IsEmpty]: Start isEmpty. Operand 26960 states and 39700 transitions. [2021-11-07 01:30:50,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-07 01:30:50,641 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:50,641 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:30:50,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:30:50,642 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:50,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:50,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1520611737, now seen corresponding path program 1 times [2021-11-07 01:30:50,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:50,643 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307166711] [2021-11-07 01:30:50,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:50,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:50,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:50,720 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:50,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:50,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307166711] [2021-11-07 01:30:50,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307166711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:50,722 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:50,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:50,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152148326] [2021-11-07 01:30:50,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:50,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:50,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:50,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:50,728 INFO L87 Difference]: Start difference. First operand 26960 states and 39700 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 01:30:52,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:52,843 INFO L93 Difference]: Finished difference Result 91463 states and 134051 transitions. [2021-11-07 01:30:52,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:52,847 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 100 [2021-11-07 01:30:52,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:52,948 INFO L225 Difference]: With dead ends: 91463 [2021-11-07 01:30:52,948 INFO L226 Difference]: Without dead ends: 64511 [2021-11-07 01:30:52,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:30:53,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64511 states. [2021-11-07 01:30:54,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64511 to 50287. [2021-11-07 01:30:54,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50287 states, 50285 states have (on average 1.458904245798946) internal successors, (73361), 50286 states have internal predecessors, (73361), 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 01:30:54,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50287 states to 50287 states and 73361 transitions. [2021-11-07 01:30:54,874 INFO L78 Accepts]: Start accepts. Automaton has 50287 states and 73361 transitions. Word has length 100 [2021-11-07 01:30:54,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:54,874 INFO L470 AbstractCegarLoop]: Abstraction has 50287 states and 73361 transitions. [2021-11-07 01:30:54,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 01:30:54,875 INFO L276 IsEmpty]: Start isEmpty. Operand 50287 states and 73361 transitions. [2021-11-07 01:30:55,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-07 01:30:55,023 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:55,023 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:30:55,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 01:30:55,024 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:55,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:55,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1373403449, now seen corresponding path program 1 times [2021-11-07 01:30:55,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:55,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142973788] [2021-11-07 01:30:55,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:55,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:55,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:55,097 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:55,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:55,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142973788] [2021-11-07 01:30:55,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142973788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:30:55,098 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:30:55,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:30:55,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206061780] [2021-11-07 01:30:55,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:30:55,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:55,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:30:55,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:30:55,100 INFO L87 Difference]: Start difference. First operand 50287 states and 73361 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 01:30:59,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:59,120 INFO L93 Difference]: Finished difference Result 159129 states and 231319 transitions. [2021-11-07 01:30:59,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:30:59,121 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 100 [2021-11-07 01:30:59,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:59,310 INFO L225 Difference]: With dead ends: 159129 [2021-11-07 01:30:59,310 INFO L226 Difference]: Without dead ends: 108866 [2021-11-07 01:30:59,357 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:30:59,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108866 states. [2021-11-07 01:31:02,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108866 to 96430. [2021-11-07 01:31:03,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96430 states, 96428 states have (on average 1.4430455884183018) internal successors, (139150), 96429 states have internal predecessors, (139150), 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 01:31:03,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96430 states to 96430 states and 139150 transitions. [2021-11-07 01:31:03,245 INFO L78 Accepts]: Start accepts. Automaton has 96430 states and 139150 transitions. Word has length 100 [2021-11-07 01:31:03,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:31:03,246 INFO L470 AbstractCegarLoop]: Abstraction has 96430 states and 139150 transitions. [2021-11-07 01:31:03,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 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 01:31:03,246 INFO L276 IsEmpty]: Start isEmpty. Operand 96430 states and 139150 transitions. [2021-11-07 01:31:03,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-07 01:31:03,377 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:31:03,377 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:31:03,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 01:31:03,378 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:31:03,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:31:03,378 INFO L85 PathProgramCache]: Analyzing trace with hash 411127741, now seen corresponding path program 1 times [2021-11-07 01:31:03,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:31:03,379 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951114146] [2021-11-07 01:31:03,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:31:03,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:31:03,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:31:03,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:31:03,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:31:03,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951114146] [2021-11-07 01:31:03,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951114146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:31:03,441 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:31:03,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 01:31:03,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619179504] [2021-11-07 01:31:03,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:31:03,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:31:03,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:31:03,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:31:03,444 INFO L87 Difference]: Start difference. First operand 96430 states and 139150 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 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 01:31:09,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:31:09,212 INFO L93 Difference]: Finished difference Result 275518 states and 397370 transitions. [2021-11-07 01:31:09,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:31:09,213 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 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) Word has length 101 [2021-11-07 01:31:09,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:31:09,526 INFO L225 Difference]: With dead ends: 275518 [2021-11-07 01:31:09,526 INFO L226 Difference]: Without dead ends: 179105 [2021-11-07 01:31:09,607 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:31:09,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179105 states.