./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-numeric/Ackermann01-1.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-numeric/Ackermann01-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 380ed529f726f53285b49ce40e57404dbe066b029b8c3af7ce337366515780a5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:29:29,632 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:29:29,634 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:29:29,671 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:29:29,671 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:29:29,675 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:29:29,677 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:29:29,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:29:29,683 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:29:29,688 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:29:29,689 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:29:29,691 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:29:29,692 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:29:29,694 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:29:29,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:29:29,704 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:29:29,706 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:29:29,707 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:29:29,709 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:29:29,716 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:29:29,718 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:29:29,719 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:29:29,722 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:29:29,723 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:29:29,732 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:29:29,732 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:29:29,733 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:29:29,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:29:29,735 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:29:29,737 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:29:29,738 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:29:29,739 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:29:29,740 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:29:29,741 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:29:29,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:29:29,743 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:29:29,744 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:29:29,744 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:29:29,744 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:29:29,745 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:29:29,746 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:29:29,747 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/config/svcomp-Overflow-64bit-Taipan_Default.epf [2021-11-03 04:29:29,791 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:29:29,792 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:29:29,793 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:29:29,793 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:29:29,793 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:29:29,793 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:29:29,796 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:29:29,799 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:29:29,799 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:29:29,800 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:29:29,800 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:29:29,800 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:29:29,800 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:29:29,801 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:29:29,801 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:29:29,802 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:29:29,802 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-03 04:29:29,802 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:29:29,802 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:29:29,802 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:29:29,803 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:29:29,803 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:29:29,803 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-03 04:29:29,803 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:29:29,804 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:29:29,804 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:29:29,804 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:29:29,804 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:29:29,805 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:29:29,805 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:29:29,805 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:29:29,805 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:29:29,806 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:29:29,806 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:29:29,806 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:29:29,806 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:29:29,807 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:29:29,807 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_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 380ed529f726f53285b49ce40e57404dbe066b029b8c3af7ce337366515780a5 [2021-11-03 04:29:30,067 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:29:30,087 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:29:30,090 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:29:30,091 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:29:30,092 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:29:30,093 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/termination-numeric/Ackermann01-1.c [2021-11-03 04:29:30,162 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/data/678c1e442/e0559ee48dcb417f9909679758f9f2b4/FLAG17a2b468d [2021-11-03 04:29:30,580 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:29:30,581 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/sv-benchmarks/c/termination-numeric/Ackermann01-1.c [2021-11-03 04:29:30,587 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/data/678c1e442/e0559ee48dcb417f9909679758f9f2b4/FLAG17a2b468d [2021-11-03 04:29:30,980 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/data/678c1e442/e0559ee48dcb417f9909679758f9f2b4 [2021-11-03 04:29:30,982 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:29:30,984 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:29:30,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:29:30,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:29:30,988 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:29:30,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:29:30" (1/1) ... [2021-11-03 04:29:30,990 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c99272f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:30, skipping insertion in model container [2021-11-03 04:29:30,990 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:29:30" (1/1) ... [2021-11-03 04:29:31,008 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:29:31,030 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:29:31,198 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_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/sv-benchmarks/c/termination-numeric/Ackermann01-1.c[944,957] [2021-11-03 04:29:31,199 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:29:31,207 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:29:31,223 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_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/sv-benchmarks/c/termination-numeric/Ackermann01-1.c[944,957] [2021-11-03 04:29:31,223 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:29:31,236 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:29:31,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31 WrapperNode [2021-11-03 04:29:31,237 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:29:31,238 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:29:31,238 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:29:31,238 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:29:31,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,252 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,268 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:29:31,268 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:29:31,269 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:29:31,269 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:29:31,276 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,278 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,282 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,285 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,287 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:29:31,287 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:29:31,288 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:29:31,288 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:29:31,289 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (1/1) ... [2021-11-03 04:29:31,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:29:31,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:31,323 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:29:31,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:29:31,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:29:31,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:29:31,374 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-03 04:29:31,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-03 04:29:31,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:29:31,374 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:29:31,615 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:29:31,615 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 04:29:31,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:29:31 BoogieIcfgContainer [2021-11-03 04:29:31,617 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:29:31,619 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:29:31,619 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:29:31,623 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:29:31,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:29:30" (1/3) ... [2021-11-03 04:29:31,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c8c86f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:29:31, skipping insertion in model container [2021-11-03 04:29:31,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:29:31" (2/3) ... [2021-11-03 04:29:31,628 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c8c86f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:29:31, skipping insertion in model container [2021-11-03 04:29:31,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:29:31" (3/3) ... [2021-11-03 04:29:31,630 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann01-1.c [2021-11-03 04:29:31,635 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:29:31,635 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2021-11-03 04:29:31,680 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:29:31,687 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 [2021-11-03 04:29:31,687 INFO L340 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-11-03 04:29:31,703 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-03 04:29:31,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 04:29:31,724 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:31,725 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:31,725 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:31,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:31,750 INFO L85 PathProgramCache]: Analyzing trace with hash -485783226, now seen corresponding path program 1 times [2021-11-03 04:29:31,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:31,760 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037117892] [2021-11-03 04:29:31,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:31,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:31,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:31,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:31,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:31,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037117892] [2021-11-03 04:29:31,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037117892] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:31,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:29:31,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:29:31,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260554420] [2021-11-03 04:29:31,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:29:31,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:32,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:29:32,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:29:32,015 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:32,149 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2021-11-03 04:29:32,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:29:32,151 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-03 04:29:32,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:32,160 INFO L225 Difference]: With dead ends: 65 [2021-11-03 04:29:32,160 INFO L226 Difference]: Without dead ends: 58 [2021-11-03 04:29:32,162 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:29:32,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-03 04:29:32,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-11-03 04:29:32,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 41 states have internal predecessors, (51), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-03 04:29:32,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-11-03 04:29:32,209 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2021-11-03 04:29:32,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:32,209 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-11-03 04:29:32,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,210 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-11-03 04:29:32,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:29:32,211 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:32,211 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:32,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:29:32,211 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:32,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:32,213 INFO L85 PathProgramCache]: Analyzing trace with hash 2120594237, now seen corresponding path program 1 times [2021-11-03 04:29:32,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:32,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242678086] [2021-11-03 04:29:32,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:32,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:32,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:32,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:32,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:32,268 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242678086] [2021-11-03 04:29:32,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242678086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:32,269 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:29:32,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:29:32,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31322627] [2021-11-03 04:29:32,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:29:32,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:32,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:29:32,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:29:32,272 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:32,336 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2021-11-03 04:29:32,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:29:32,337 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:29:32,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:32,338 INFO L225 Difference]: With dead ends: 50 [2021-11-03 04:29:32,339 INFO L226 Difference]: Without dead ends: 48 [2021-11-03 04:29:32,339 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:29:32,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-03 04:29:32,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-03 04:29:32,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 39 states have internal predecessors, (47), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-03 04:29:32,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-03 04:29:32,361 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 8 [2021-11-03 04:29:32,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:32,361 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-03 04:29:32,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,362 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-03 04:29:32,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:29:32,363 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:32,363 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:32,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:29:32,364 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:32,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:32,370 INFO L85 PathProgramCache]: Analyzing trace with hash 2120589240, now seen corresponding path program 1 times [2021-11-03 04:29:32,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:32,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115609068] [2021-11-03 04:29:32,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:32,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:32,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:32,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:32,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:32,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115609068] [2021-11-03 04:29:32,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115609068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:32,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:29:32,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:29:32,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156218041] [2021-11-03 04:29:32,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:29:32,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:32,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:29:32,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:29:32,454 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:32,522 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2021-11-03 04:29:32,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:29:32,522 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:29:32,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:32,524 INFO L225 Difference]: With dead ends: 75 [2021-11-03 04:29:32,525 INFO L226 Difference]: Without dead ends: 73 [2021-11-03 04:29:32,525 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:29:32,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-03 04:29:32,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-11-03 04:29:32,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 48 states have (on average 1.375) internal successors, (66), 54 states have internal predecessors, (66), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-03 04:29:32,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2021-11-03 04:29:32,548 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 8 [2021-11-03 04:29:32,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:32,548 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2021-11-03 04:29:32,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,549 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2021-11-03 04:29:32,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 04:29:32,550 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:32,550 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:32,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:29:32,550 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:32,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:32,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1313911977, now seen corresponding path program 1 times [2021-11-03 04:29:32,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:32,552 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541172337] [2021-11-03 04:29:32,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:32,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:32,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:32,652 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:32,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541172337] [2021-11-03 04:29:32,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541172337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:32,653 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:29:32,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:29:32,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073717973] [2021-11-03 04:29:32,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:29:32,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:32,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:29:32,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:29:32,656 INFO L87 Difference]: Start difference. First operand 67 states and 85 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:32,729 INFO L93 Difference]: Finished difference Result 115 states and 153 transitions. [2021-11-03 04:29:32,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:29:32,730 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-03 04:29:32,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:32,732 INFO L225 Difference]: With dead ends: 115 [2021-11-03 04:29:32,733 INFO L226 Difference]: Without dead ends: 107 [2021-11-03 04:29:32,733 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:29:32,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-03 04:29:32,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 99. [2021-11-03 04:29:32,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.3150684931506849) internal successors, (96), 80 states have internal predecessors, (96), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-03 04:29:32,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2021-11-03 04:29:32,777 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2021-11-03 04:29:32,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:32,778 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2021-11-03 04:29:32,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,778 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2021-11-03 04:29:32,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 04:29:32,779 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:32,779 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:32,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:29:32,780 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:32,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:32,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1157967476, now seen corresponding path program 1 times [2021-11-03 04:29:32,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:32,781 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812872093] [2021-11-03 04:29:32,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:32,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:32,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:32,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:32,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:32,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812872093] [2021-11-03 04:29:32,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812872093] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:32,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:29:32,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:29:32,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900520404] [2021-11-03 04:29:32,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:29:32,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:32,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:29:32,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:29:32,833 INFO L87 Difference]: Start difference. First operand 99 states and 125 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:32,915 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2021-11-03 04:29:32,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:29:32,915 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-03 04:29:32,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:32,917 INFO L225 Difference]: With dead ends: 167 [2021-11-03 04:29:32,917 INFO L226 Difference]: Without dead ends: 96 [2021-11-03 04:29:32,919 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:29:32,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-03 04:29:32,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-11-03 04:29:32,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.3) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-03 04:29:32,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2021-11-03 04:29:32,948 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 15 [2021-11-03 04:29:32,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:32,949 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2021-11-03 04:29:32,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:32,949 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2021-11-03 04:29:32,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 04:29:32,950 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:32,950 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:32,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 04:29:32,955 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:32,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:32,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1157960525, now seen corresponding path program 1 times [2021-11-03 04:29:32,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:32,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081727979] [2021-11-03 04:29:32,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:32,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:32,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:33,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:33,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:33,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081727979] [2021-11-03 04:29:33,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081727979] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:33,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973252013] [2021-11-03 04:29:33,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:33,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:33,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:33,062 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:33,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:29:33,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:33,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 04:29:33,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:33,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:33,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:33,424 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:33,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973252013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:33,425 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659068994] [2021-11-03 04:29:33,447 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:29:33,454 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:33,463 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:33,464 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:33,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-03 04:29:33,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819155436] [2021-11-03 04:29:33,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:29:33,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:33,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:29:33,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-03 04:29:33,467 INFO L87 Difference]: Start difference. First operand 95 states and 118 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:33,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:33,794 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2021-11-03 04:29:33,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-03 04:29:33,795 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-03 04:29:33,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:33,808 INFO L225 Difference]: With dead ends: 273 [2021-11-03 04:29:33,808 INFO L226 Difference]: Without dead ends: 271 [2021-11-03 04:29:33,810 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-03 04:29:33,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-03 04:29:33,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2021-11-03 04:29:33,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 181 states have (on average 1.2651933701657458) internal successors, (229), 188 states have internal predecessors, (229), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-03 04:29:33,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2021-11-03 04:29:33,868 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 15 [2021-11-03 04:29:33,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:33,869 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2021-11-03 04:29:33,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:33,869 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2021-11-03 04:29:33,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 04:29:33,871 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:33,871 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:33,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:34,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:34,086 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:34,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:34,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1414387214, now seen corresponding path program 1 times [2021-11-03 04:29:34,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:34,087 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506209943] [2021-11-03 04:29:34,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:34,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:34,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:34,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:34,182 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:34,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506209943] [2021-11-03 04:29:34,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506209943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:34,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621554842] [2021-11-03 04:29:34,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:34,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:34,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:34,192 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:34,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 04:29:34,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:34,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 04:29:34,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:34,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:34,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:34,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:34,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621554842] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:34,433 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-03 04:29:34,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [6] total 11 [2021-11-03 04:29:34,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529956222] [2021-11-03 04:29:34,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-03 04:29:34,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:34,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-03 04:29:34,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-03 04:29:34,437 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:34,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:34,547 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2021-11-03 04:29:34,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:29:34,548 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-03 04:29:34,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:34,555 INFO L225 Difference]: With dead ends: 327 [2021-11-03 04:29:34,555 INFO L226 Difference]: Without dead ends: 326 [2021-11-03 04:29:34,560 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-03 04:29:34,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-03 04:29:34,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2021-11-03 04:29:34,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 226 states have (on average 1.261061946902655) internal successors, (285), 233 states have internal predecessors, (285), 45 states have call successors, (45), 16 states have call predecessors, (45), 15 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-03 04:29:34,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2021-11-03 04:29:34,608 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 16 [2021-11-03 04:29:34,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:34,608 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2021-11-03 04:29:34,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:34,609 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2021-11-03 04:29:34,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-03 04:29:34,610 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:34,611 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:34,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:34,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:34,826 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:34,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:34,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1759033444, now seen corresponding path program 1 times [2021-11-03 04:29:34,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:34,827 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584320186] [2021-11-03 04:29:34,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:34,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:34,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:34,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:34,882 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584320186] [2021-11-03 04:29:34,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584320186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:34,883 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856830101] [2021-11-03 04:29:34,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:34,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:34,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:34,884 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:34,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 04:29:34,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:34,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 04:29:34,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:35,020 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:35,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:35,150 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:35,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856830101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:35,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [741543163] [2021-11-03 04:29:35,153 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:29:35,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:35,154 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:35,155 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:35,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-03 04:29:35,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866689501] [2021-11-03 04:29:35,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:29:35,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:35,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:29:35,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-03 04:29:35,160 INFO L87 Difference]: Start difference. First operand 292 states and 372 transitions. Second operand has 12 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:35,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:35,399 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2021-11-03 04:29:35,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-03 04:29:35,400 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-03 04:29:35,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:35,406 INFO L225 Difference]: With dead ends: 590 [2021-11-03 04:29:35,406 INFO L226 Difference]: Without dead ends: 589 [2021-11-03 04:29:35,407 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-03 04:29:35,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-03 04:29:35,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2021-11-03 04:29:35,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 406 states have (on average 1.2044334975369457) internal successors, (489), 413 states have internal predecessors, (489), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2021-11-03 04:29:35,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2021-11-03 04:29:35,462 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 19 [2021-11-03 04:29:35,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:35,462 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2021-11-03 04:29:35,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:35,463 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2021-11-03 04:29:35,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-03 04:29:35,470 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:35,470 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:35,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:35,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:35,694 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:35,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:35,694 INFO L85 PathProgramCache]: Analyzing trace with hash -67610053, now seen corresponding path program 1 times [2021-11-03 04:29:35,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:35,695 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164470736] [2021-11-03 04:29:35,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:35,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:35,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:35,790 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:35,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:35,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164470736] [2021-11-03 04:29:35,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164470736] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:35,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284535133] [2021-11-03 04:29:35,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:35,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:35,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:35,811 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:35,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 04:29:35,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:35,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 04:29:35,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:35,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:35,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:36,194 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:36,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284535133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:36,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944510753] [2021-11-03 04:29:36,202 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:29:36,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:36,203 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:36,203 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:36,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-03 04:29:36,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882573428] [2021-11-03 04:29:36,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-03 04:29:36,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:36,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-03 04:29:36,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-11-03 04:29:36,205 INFO L87 Difference]: Start difference. First operand 520 states and 648 transitions. Second operand has 14 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:29:36,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:36,470 INFO L93 Difference]: Finished difference Result 824 states and 1154 transitions. [2021-11-03 04:29:36,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-03 04:29:36,471 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-03 04:29:36,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:36,477 INFO L225 Difference]: With dead ends: 824 [2021-11-03 04:29:36,478 INFO L226 Difference]: Without dead ends: 822 [2021-11-03 04:29:36,480 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:29:36,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-11-03 04:29:36,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 747. [2021-11-03 04:29:36,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 558 states have (on average 1.1971326164874552) internal successors, (668), 584 states have internal predecessors, (668), 130 states have call successors, (130), 35 states have call predecessors, (130), 53 states have return successors, (154), 127 states have call predecessors, (154), 126 states have call successors, (154) [2021-11-03 04:29:36,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 952 transitions. [2021-11-03 04:29:36,565 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 952 transitions. Word has length 23 [2021-11-03 04:29:36,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:36,566 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 952 transitions. [2021-11-03 04:29:36,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:29:36,566 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 952 transitions. [2021-11-03 04:29:36,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 04:29:36,568 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:36,568 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:36,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:36,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-03 04:29:36,783 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:36,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:36,784 INFO L85 PathProgramCache]: Analyzing trace with hash -2095911581, now seen corresponding path program 1 times [2021-11-03 04:29:36,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:36,784 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104224286] [2021-11-03 04:29:36,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:36,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:36,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:36,857 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:36,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:36,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104224286] [2021-11-03 04:29:36,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104224286] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:36,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245235380] [2021-11-03 04:29:36,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:36,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:36,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:36,866 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:36,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 04:29:36,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:36,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 04:29:36,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:37,034 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:37,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:37,118 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:37,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245235380] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 04:29:37,119 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-03 04:29:37,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7] total 13 [2021-11-03 04:29:37,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270752669] [2021-11-03 04:29:37,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 04:29:37,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:37,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 04:29:37,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-11-03 04:29:37,122 INFO L87 Difference]: Start difference. First operand 747 states and 952 transitions. Second operand has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:29:37,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:37,323 INFO L93 Difference]: Finished difference Result 756 states and 962 transitions. [2021-11-03 04:29:37,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 04:29:37,324 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-11-03 04:29:37,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:37,333 INFO L225 Difference]: With dead ends: 756 [2021-11-03 04:29:37,333 INFO L226 Difference]: Without dead ends: 755 [2021-11-03 04:29:37,334 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-03 04:29:37,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-03 04:29:37,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 746. [2021-11-03 04:29:37,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 558 states have (on average 1.1827956989247312) internal successors, (660), 583 states have internal predecessors, (660), 130 states have call successors, (130), 35 states have call predecessors, (130), 53 states have return successors, (154), 127 states have call predecessors, (154), 126 states have call successors, (154) [2021-11-03 04:29:37,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2021-11-03 04:29:37,407 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2021-11-03 04:29:37,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:37,408 INFO L470 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2021-11-03 04:29:37,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:29:37,408 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2021-11-03 04:29:37,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-03 04:29:37,410 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:37,410 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:37,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:37,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:37,634 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:37,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:37,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1088255015, now seen corresponding path program 1 times [2021-11-03 04:29:37,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:37,635 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111288165] [2021-11-03 04:29:37,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:37,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:37,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:37,721 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-03 04:29:37,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:37,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111288165] [2021-11-03 04:29:37,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111288165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:37,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888600712] [2021-11-03 04:29:37,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:37,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:37,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:37,723 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:37,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 04:29:37,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:37,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 04:29:37,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 04:29:37,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:38,074 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 04:29:38,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888600712] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:38,074 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 04:29:38,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2021-11-03 04:29:38,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942789921] [2021-11-03 04:29:38,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-03 04:29:38,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:38,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-03 04:29:38,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-03 04:29:38,078 INFO L87 Difference]: Start difference. First operand 746 states and 944 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:29:38,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:38,315 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2021-11-03 04:29:38,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-03 04:29:38,315 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-11-03 04:29:38,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:38,323 INFO L225 Difference]: With dead ends: 901 [2021-11-03 04:29:38,323 INFO L226 Difference]: Without dead ends: 900 [2021-11-03 04:29:38,325 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-03 04:29:38,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-03 04:29:38,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2021-11-03 04:29:38,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 616 states have (on average 1.1818181818181819) internal successors, (728), 644 states have internal predecessors, (728), 149 states have call successors, (149), 38 states have call predecessors, (149), 59 states have return successors, (183), 146 states have call predecessors, (183), 145 states have call successors, (183) [2021-11-03 04:29:38,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2021-11-03 04:29:38,394 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 27 [2021-11-03 04:29:38,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:38,394 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2021-11-03 04:29:38,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:29:38,395 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2021-11-03 04:29:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 04:29:38,396 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:38,396 INFO L513 BasicCegarLoop]: trace histogram [4, 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] [2021-11-03 04:29:38,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:38,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-03 04:29:38,622 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:38,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:38,622 INFO L85 PathProgramCache]: Analyzing trace with hash 781121552, now seen corresponding path program 1 times [2021-11-03 04:29:38,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:38,623 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169812654] [2021-11-03 04:29:38,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:38,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:38,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:38,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:38,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169812654] [2021-11-03 04:29:38,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169812654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:38,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189602329] [2021-11-03 04:29:38,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:38,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:38,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:38,694 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:38,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-03 04:29:38,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:38,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-03 04:29:38,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:38,937 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:38,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:39,229 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:39,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189602329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:39,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [994820692] [2021-11-03 04:29:39,232 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-03 04:29:39,232 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:39,232 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:39,233 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:39,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-03 04:29:39,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459838325] [2021-11-03 04:29:39,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-03 04:29:39,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:39,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-03 04:29:39,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-11-03 04:29:39,235 INFO L87 Difference]: Start difference. First operand 829 states and 1060 transitions. Second operand has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-03 04:29:39,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:39,772 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2021-11-03 04:29:39,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-03 04:29:39,773 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) Word has length 32 [2021-11-03 04:29:39,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:39,799 INFO L225 Difference]: With dead ends: 1544 [2021-11-03 04:29:39,800 INFO L226 Difference]: Without dead ends: 1542 [2021-11-03 04:29:39,801 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2021-11-03 04:29:39,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2021-11-03 04:29:39,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2021-11-03 04:29:39,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1294 states, 927 states have (on average 1.1661272923408845) internal successors, (1081), 974 states have internal predecessors, (1081), 247 states have call successors, (247), 53 states have call predecessors, (247), 115 states have return successors, (548), 266 states have call predecessors, (548), 242 states have call successors, (548) [2021-11-03 04:29:39,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2021-11-03 04:29:39,942 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 32 [2021-11-03 04:29:39,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:39,945 INFO L470 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2021-11-03 04:29:39,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-03 04:29:39,945 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2021-11-03 04:29:39,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-03 04:29:39,948 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:39,948 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:39,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:40,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:40,162 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:40,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:40,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1723945233, now seen corresponding path program 2 times [2021-11-03 04:29:40,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:40,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300544822] [2021-11-03 04:29:40,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:40,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:40,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:40,276 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-03 04:29:40,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:40,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300544822] [2021-11-03 04:29:40,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300544822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:40,277 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772826186] [2021-11-03 04:29:40,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:29:40,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:40,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:40,282 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:40,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-03 04:29:40,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-03 04:29:40,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:29:40,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 04:29:40,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:40,563 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-03 04:29:40,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:40,812 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-03 04:29:40,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772826186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:40,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [680295993] [2021-11-03 04:29:40,817 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:29:40,817 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:40,818 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:40,819 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:40,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-03 04:29:40,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140924279] [2021-11-03 04:29:40,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-03 04:29:40,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:40,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-03 04:29:40,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-03 04:29:40,822 INFO L87 Difference]: Start difference. First operand 1294 states and 1876 transitions. Second operand has 18 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:29:41,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:41,543 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2021-11-03 04:29:41,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-03 04:29:41,543 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2021-11-03 04:29:41,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:41,566 INFO L225 Difference]: With dead ends: 2153 [2021-11-03 04:29:41,567 INFO L226 Difference]: Without dead ends: 2119 [2021-11-03 04:29:41,569 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:29:41,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-11-03 04:29:41,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1968. [2021-11-03 04:29:41,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1968 states, 1409 states have (on average 1.1518807665010646) internal successors, (1623), 1485 states have internal predecessors, (1623), 376 states have call successors, (376), 82 states have call predecessors, (376), 178 states have return successors, (845), 400 states have call predecessors, (845), 361 states have call successors, (845) [2021-11-03 04:29:41,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1968 states to 1968 states and 2844 transitions. [2021-11-03 04:29:41,742 INFO L78 Accepts]: Start accepts. Automaton has 1968 states and 2844 transitions. Word has length 35 [2021-11-03 04:29:41,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:41,743 INFO L470 AbstractCegarLoop]: Abstraction has 1968 states and 2844 transitions. [2021-11-03 04:29:41,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:29:41,743 INFO L276 IsEmpty]: Start isEmpty. Operand 1968 states and 2844 transitions. [2021-11-03 04:29:41,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 04:29:41,746 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:41,746 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:41,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:41,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:41,970 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:41,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:41,970 INFO L85 PathProgramCache]: Analyzing trace with hash -392749188, now seen corresponding path program 1 times [2021-11-03 04:29:41,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:41,971 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383927842] [2021-11-03 04:29:41,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:41,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:41,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:42,037 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:42,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:42,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383927842] [2021-11-03 04:29:42,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383927842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:42,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28086857] [2021-11-03 04:29:42,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:42,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:42,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:42,050 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:42,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 04:29:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:42,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-03 04:29:42,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:42,354 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:42,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:42,609 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:42,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28086857] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:42,609 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 04:29:42,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2021-11-03 04:29:42,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221002128] [2021-11-03 04:29:42,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-03 04:29:42,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:42,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-03 04:29:42,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-03 04:29:42,611 INFO L87 Difference]: Start difference. First operand 1968 states and 2844 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-03 04:29:42,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:42,930 INFO L93 Difference]: Finished difference Result 2200 states and 3487 transitions. [2021-11-03 04:29:42,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-03 04:29:42,930 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-11-03 04:29:42,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:42,950 INFO L225 Difference]: With dead ends: 2200 [2021-11-03 04:29:42,950 INFO L226 Difference]: Without dead ends: 2199 [2021-11-03 04:29:42,952 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-11-03 04:29:42,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-11-03 04:29:43,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 1976. [2021-11-03 04:29:43,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1976 states, 1417 states have (on average 1.1489061397318279) internal successors, (1628), 1489 states have internal predecessors, (1628), 380 states have call successors, (380), 82 states have call predecessors, (380), 174 states have return successors, (699), 404 states have call predecessors, (699), 365 states have call successors, (699) [2021-11-03 04:29:43,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1976 states to 1976 states and 2707 transitions. [2021-11-03 04:29:43,131 INFO L78 Accepts]: Start accepts. Automaton has 1976 states and 2707 transitions. Word has length 36 [2021-11-03 04:29:43,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:43,132 INFO L470 AbstractCegarLoop]: Abstraction has 1976 states and 2707 transitions. [2021-11-03 04:29:43,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-03 04:29:43,132 INFO L276 IsEmpty]: Start isEmpty. Operand 1976 states and 2707 transitions. [2021-11-03 04:29:43,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-03 04:29:43,134 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:43,135 INFO L513 BasicCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:43,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:43,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-03 04:29:43,351 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:43,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:43,352 INFO L85 PathProgramCache]: Analyzing trace with hash 667896149, now seen corresponding path program 1 times [2021-11-03 04:29:43,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:43,353 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913288333] [2021-11-03 04:29:43,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:43,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:43,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:43,419 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-03 04:29:43,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:43,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913288333] [2021-11-03 04:29:43,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913288333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:43,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577781834] [2021-11-03 04:29:43,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:43,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:43,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:43,422 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:43,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-03 04:29:43,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:43,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 04:29:43,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:43,722 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-03 04:29:43,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:43,946 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-03 04:29:43,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577781834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:43,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161537668] [2021-11-03 04:29:43,949 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-03 04:29:43,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:43,950 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:43,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:43,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-03 04:29:43,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296464526] [2021-11-03 04:29:43,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-03 04:29:43,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:43,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-03 04:29:43,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-03 04:29:43,954 INFO L87 Difference]: Start difference. First operand 1976 states and 2707 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:29:44,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:44,172 INFO L93 Difference]: Finished difference Result 3068 states and 4537 transitions. [2021-11-03 04:29:44,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:29:44,173 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-11-03 04:29:44,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:44,186 INFO L225 Difference]: With dead ends: 3068 [2021-11-03 04:29:44,186 INFO L226 Difference]: Without dead ends: 1692 [2021-11-03 04:29:44,201 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2021-11-03 04:29:44,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2021-11-03 04:29:44,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1218. [2021-11-03 04:29:44,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1218 states, 940 states have (on average 1.195744680851064) internal successors, (1124), 969 states have internal predecessors, (1124), 179 states have call successors, (179), 80 states have call predecessors, (179), 94 states have return successors, (265), 168 states have call predecessors, (265), 154 states have call successors, (265) [2021-11-03 04:29:44,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1568 transitions. [2021-11-03 04:29:44,293 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1568 transitions. Word has length 42 [2021-11-03 04:29:44,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:44,293 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1568 transitions. [2021-11-03 04:29:44,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:29:44,294 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1568 transitions. [2021-11-03 04:29:44,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-03 04:29:44,296 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:44,296 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-03 04:29:44,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:44,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-03 04:29:44,510 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:44,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:44,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1973718694, now seen corresponding path program 2 times [2021-11-03 04:29:44,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:44,511 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948332756] [2021-11-03 04:29:44,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:44,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:44,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:44,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:44,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948332756] [2021-11-03 04:29:44,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948332756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:44,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92892217] [2021-11-03 04:29:44,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:29:44,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:44,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:44,643 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:44,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-03 04:29:44,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-03 04:29:44,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:29:44,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 04:29:44,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:44,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:45,242 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:45,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92892217] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:45,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502672464] [2021-11-03 04:29:45,244 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:29:45,244 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:45,245 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:45,245 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:45,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2021-11-03 04:29:45,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429802277] [2021-11-03 04:29:45,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 04:29:45,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:45,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 04:29:45,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2021-11-03 04:29:45,247 INFO L87 Difference]: Start difference. First operand 1218 states and 1568 transitions. Second operand has 24 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 14 states have internal predecessors, (74), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:45,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:45,909 INFO L93 Difference]: Finished difference Result 2184 states and 2971 transitions. [2021-11-03 04:29:45,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-03 04:29:45,910 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 14 states have internal predecessors, (74), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-03 04:29:45,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:45,926 INFO L225 Difference]: With dead ends: 2184 [2021-11-03 04:29:45,926 INFO L226 Difference]: Without dead ends: 2183 [2021-11-03 04:29:45,928 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2021-11-03 04:29:45,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2021-11-03 04:29:46,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 1938. [2021-11-03 04:29:46,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1938 states, 1480 states have (on average 1.172972972972973) internal successors, (1736), 1533 states have internal predecessors, (1736), 287 states have call successors, (287), 116 states have call predecessors, (287), 166 states have return successors, (445), 288 states have call predecessors, (445), 262 states have call successors, (445) [2021-11-03 04:29:46,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2468 transitions. [2021-11-03 04:29:46,063 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2468 transitions. Word has length 43 [2021-11-03 04:29:46,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:46,063 INFO L470 AbstractCegarLoop]: Abstraction has 1938 states and 2468 transitions. [2021-11-03 04:29:46,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 14 states have internal predecessors, (74), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:46,064 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2468 transitions. [2021-11-03 04:29:46,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-03 04:29:46,066 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:46,066 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:46,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:46,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-03 04:29:46,290 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:46,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:46,290 INFO L85 PathProgramCache]: Analyzing trace with hash 911791974, now seen corresponding path program 2 times [2021-11-03 04:29:46,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:46,291 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716173630] [2021-11-03 04:29:46,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:46,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:46,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:46,381 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 04:29:46,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:46,382 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716173630] [2021-11-03 04:29:46,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716173630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:46,382 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200687691] [2021-11-03 04:29:46,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:29:46,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:46,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:46,383 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:46,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 04:29:46,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-03 04:29:46,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:29:46,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 04:29:46,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:47,043 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-03 04:29:47,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:47,404 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-03 04:29:47,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200687691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:47,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [954657344] [2021-11-03 04:29:47,407 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-03 04:29:47,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:47,408 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:47,409 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:47,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 13] total 23 [2021-11-03 04:29:47,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727442399] [2021-11-03 04:29:47,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-03 04:29:47,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:47,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-03 04:29:47,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:29:47,411 INFO L87 Difference]: Start difference. First operand 1938 states and 2468 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 18 states have internal predecessors, (76), 9 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-03 04:29:48,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:48,454 INFO L93 Difference]: Finished difference Result 3169 states and 4414 transitions. [2021-11-03 04:29:48,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-03 04:29:48,455 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 18 states have internal predecessors, (76), 9 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 44 [2021-11-03 04:29:48,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:48,469 INFO L225 Difference]: With dead ends: 3169 [2021-11-03 04:29:48,469 INFO L226 Difference]: Without dead ends: 1492 [2021-11-03 04:29:48,486 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=379, Invalid=1427, Unknown=0, NotChecked=0, Total=1806 [2021-11-03 04:29:48,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-03 04:29:48,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1397. [2021-11-03 04:29:48,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1397 states, 990 states have (on average 1.0818181818181818) internal successors, (1071), 998 states have internal predecessors, (1071), 256 states have call successors, (256), 60 states have call predecessors, (256), 148 states have return successors, (452), 338 states have call predecessors, (452), 252 states have call successors, (452) [2021-11-03 04:29:48,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1779 transitions. [2021-11-03 04:29:48,626 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1779 transitions. Word has length 44 [2021-11-03 04:29:48,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:48,627 INFO L470 AbstractCegarLoop]: Abstraction has 1397 states and 1779 transitions. [2021-11-03 04:29:48,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 18 states have internal predecessors, (76), 9 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-03 04:29:48,627 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1779 transitions. [2021-11-03 04:29:48,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-03 04:29:48,629 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:48,630 INFO L513 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:48,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:48,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:48,850 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:48,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:48,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1514129268, now seen corresponding path program 1 times [2021-11-03 04:29:48,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:48,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825929356] [2021-11-03 04:29:48,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:48,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:48,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:48,966 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-03 04:29:48,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:48,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825929356] [2021-11-03 04:29:48,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825929356] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:48,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955086831] [2021-11-03 04:29:48,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:48,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:48,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:48,968 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:48,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-03 04:29:49,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:49,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-03 04:29:49,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:49,425 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-03 04:29:49,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:50,003 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-03 04:29:50,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955086831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:50,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929170844] [2021-11-03 04:29:50,005 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:29:50,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:50,006 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:50,006 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:50,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2021-11-03 04:29:50,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370732913] [2021-11-03 04:29:50,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 04:29:50,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:50,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 04:29:50,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-11-03 04:29:50,008 INFO L87 Difference]: Start difference. First operand 1397 states and 1779 transitions. Second operand has 26 states, 25 states have (on average 2.04) internal successors, (51), 20 states have internal predecessors, (51), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-03 04:29:52,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:52,366 INFO L93 Difference]: Finished difference Result 4226 states and 7033 transitions. [2021-11-03 04:29:52,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-03 04:29:52,367 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.04) internal successors, (51), 20 states have internal predecessors, (51), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) Word has length 51 [2021-11-03 04:29:52,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:52,423 INFO L225 Difference]: With dead ends: 4226 [2021-11-03 04:29:52,423 INFO L226 Difference]: Without dead ends: 4194 [2021-11-03 04:29:52,429 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2354 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2021-11-03 04:29:52,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4194 states. [2021-11-03 04:29:52,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4194 to 3143. [2021-11-03 04:29:52,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3143 states, 2066 states have (on average 1.0566311713455954) internal successors, (2183), 2070 states have internal predecessors, (2183), 632 states have call successors, (632), 82 states have call predecessors, (632), 442 states have return successors, (2651), 990 states have call predecessors, (2651), 626 states have call successors, (2651) [2021-11-03 04:29:52,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3143 states to 3143 states and 5466 transitions. [2021-11-03 04:29:52,776 INFO L78 Accepts]: Start accepts. Automaton has 3143 states and 5466 transitions. Word has length 51 [2021-11-03 04:29:52,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:52,776 INFO L470 AbstractCegarLoop]: Abstraction has 3143 states and 5466 transitions. [2021-11-03 04:29:52,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.04) internal successors, (51), 20 states have internal predecessors, (51), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-03 04:29:52,777 INFO L276 IsEmpty]: Start isEmpty. Operand 3143 states and 5466 transitions. [2021-11-03 04:29:52,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-03 04:29:52,779 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:52,779 INFO L513 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:52,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:53,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-03 04:29:53,002 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:53,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:53,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1788911879, now seen corresponding path program 1 times [2021-11-03 04:29:53,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:53,003 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162746274] [2021-11-03 04:29:53,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:53,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:53,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:53,166 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 54 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-03 04:29:53,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:53,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162746274] [2021-11-03 04:29:53,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162746274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:53,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011602380] [2021-11-03 04:29:53,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:53,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:53,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:53,175 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:53,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-03 04:29:53,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:53,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-03 04:29:53,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:53,692 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 46 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-03 04:29:53,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:54,514 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 63 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-03 04:29:54,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011602380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:54,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909122746] [2021-11-03 04:29:54,516 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:29:54,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:54,517 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:54,518 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:54,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2021-11-03 04:29:54,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381109050] [2021-11-03 04:29:54,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-03 04:29:54,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:54,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-03 04:29:54,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-11-03 04:29:54,520 INFO L87 Difference]: Start difference. First operand 3143 states and 5466 transitions. Second operand has 28 states, 27 states have (on average 2.259259259259259) internal successors, (61), 20 states have internal predecessors, (61), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:29:55,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:55,877 INFO L93 Difference]: Finished difference Result 6291 states and 12447 transitions. [2021-11-03 04:29:55,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-03 04:29:55,878 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.259259259259259) internal successors, (61), 20 states have internal predecessors, (61), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 72 [2021-11-03 04:29:55,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:55,909 INFO L225 Difference]: With dead ends: 6291 [2021-11-03 04:29:55,910 INFO L226 Difference]: Without dead ends: 3586 [2021-11-03 04:29:55,951 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 04:29:55,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3586 states. [2021-11-03 04:29:56,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3586 to 3481. [2021-11-03 04:29:56,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3481 states, 2281 states have (on average 1.0473476545374836) internal successors, (2389), 2285 states have internal predecessors, (2389), 709 states have call successors, (709), 91 states have call predecessors, (709), 488 states have return successors, (2200), 1104 states have call predecessors, (2200), 703 states have call successors, (2200) [2021-11-03 04:29:56,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3481 states to 3481 states and 5298 transitions. [2021-11-03 04:29:56,265 INFO L78 Accepts]: Start accepts. Automaton has 3481 states and 5298 transitions. Word has length 72 [2021-11-03 04:29:56,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:56,265 INFO L470 AbstractCegarLoop]: Abstraction has 3481 states and 5298 transitions. [2021-11-03 04:29:56,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.259259259259259) internal successors, (61), 20 states have internal predecessors, (61), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:29:56,266 INFO L276 IsEmpty]: Start isEmpty. Operand 3481 states and 5298 transitions. [2021-11-03 04:29:56,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-03 04:29:56,269 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:56,270 INFO L513 BasicCegarLoop]: trace histogram [11, 7, 7, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-03 04:29:56,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:56,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:56,498 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:29:56,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:56,499 INFO L85 PathProgramCache]: Analyzing trace with hash -802790551, now seen corresponding path program 2 times [2021-11-03 04:29:56,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:56,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514702267] [2021-11-03 04:29:56,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:56,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:56,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:56,587 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 111 proven. 31 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-03 04:29:56,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:56,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514702267] [2021-11-03 04:29:56,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514702267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:56,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327920655] [2021-11-03 04:29:56,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:29:56,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:56,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:56,589 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:56,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-03 04:29:56,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-03 04:29:56,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:29:56,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-03 04:29:56,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:57,316 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 38 proven. 48 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-11-03 04:29:57,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:58,815 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 46 proven. 55 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-03 04:29:58,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327920655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:58,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944160240] [2021-11-03 04:29:58,817 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:29:58,818 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:58,818 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:29:58,818 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:58,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2021-11-03 04:29:58,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095869347] [2021-11-03 04:29:58,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-03 04:29:58,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:58,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-03 04:29:58,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-11-03 04:29:58,821 INFO L87 Difference]: Start difference. First operand 3481 states and 5298 transitions. Second operand has 38 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 28 states have internal predecessors, (93), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-03 04:30:06,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:06,882 INFO L93 Difference]: Finished difference Result 17825 states and 38704 transitions. [2021-11-03 04:30:06,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2021-11-03 04:30:06,883 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 28 states have internal predecessors, (93), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) Word has length 95 [2021-11-03 04:30:06,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:07,145 INFO L225 Difference]: With dead ends: 17825 [2021-11-03 04:30:07,145 INFO L226 Difference]: Without dead ends: 14316 [2021-11-03 04:30:07,211 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15297 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=6608, Invalid=36448, Unknown=0, NotChecked=0, Total=43056 [2021-11-03 04:30:07,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14316 states. [2021-11-03 04:30:08,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14316 to 7630. [2021-11-03 04:30:08,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7630 states, 4817 states have (on average 1.0298941249740503) internal successors, (4961), 4789 states have internal predecessors, (4961), 1643 states have call successors, (1643), 129 states have call predecessors, (1643), 1167 states have return successors, (8097), 2711 states have call predecessors, (8097), 1616 states have call successors, (8097) [2021-11-03 04:30:08,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7630 states to 7630 states and 14701 transitions. [2021-11-03 04:30:08,444 INFO L78 Accepts]: Start accepts. Automaton has 7630 states and 14701 transitions. Word has length 95 [2021-11-03 04:30:08,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:08,445 INFO L470 AbstractCegarLoop]: Abstraction has 7630 states and 14701 transitions. [2021-11-03 04:30:08,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 28 states have internal predecessors, (93), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-03 04:30:08,446 INFO L276 IsEmpty]: Start isEmpty. Operand 7630 states and 14701 transitions. [2021-11-03 04:30:08,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-03 04:30:08,453 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:08,453 INFO L513 BasicCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:30:08,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:08,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:08,670 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:08,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:08,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1673190007, now seen corresponding path program 2 times [2021-11-03 04:30:08,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:08,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46848452] [2021-11-03 04:30:08,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:08,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:08,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:08,883 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 93 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-03 04:30:08,884 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:08,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46848452] [2021-11-03 04:30:08,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46848452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:08,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449076039] [2021-11-03 04:30:08,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:30:08,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:08,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:08,886 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:08,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-03 04:30:09,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-03 04:30:09,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:09,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 04:30:09,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 85 proven. 40 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-03 04:30:09,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:10,519 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 105 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-03 04:30:10,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449076039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:10,519 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68375616] [2021-11-03 04:30:10,521 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:30:10,521 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:10,522 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:10,523 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:10,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2021-11-03 04:30:10,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2491583] [2021-11-03 04:30:10,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:30:10,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:10,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:30:10,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:30:10,525 INFO L87 Difference]: Start difference. First operand 7630 states and 14701 transitions. Second operand has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 24 states have internal predecessors, (89), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:30:12,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:12,669 INFO L93 Difference]: Finished difference Result 14577 states and 29711 transitions. [2021-11-03 04:30:12,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-03 04:30:12,670 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 24 states have internal predecessors, (89), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 80 [2021-11-03 04:30:12,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:12,713 INFO L225 Difference]: With dead ends: 14577 [2021-11-03 04:30:12,713 INFO L226 Difference]: Without dead ends: 7325 [2021-11-03 04:30:12,855 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2006 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2021-11-03 04:30:12,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7325 states. [2021-11-03 04:30:13,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7325 to 6147. [2021-11-03 04:30:13,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6147 states, 3970 states have (on average 1.0370277078085641) internal successors, (4117), 3947 states have internal predecessors, (4117), 1241 states have call successors, (1241), 135 states have call predecessors, (1241), 933 states have return successors, (3638), 2064 states have call predecessors, (3638), 1226 states have call successors, (3638) [2021-11-03 04:30:13,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6147 states to 6147 states and 8996 transitions. [2021-11-03 04:30:13,426 INFO L78 Accepts]: Start accepts. Automaton has 6147 states and 8996 transitions. Word has length 80 [2021-11-03 04:30:13,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:13,427 INFO L470 AbstractCegarLoop]: Abstraction has 6147 states and 8996 transitions. [2021-11-03 04:30:13,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 24 states have internal predecessors, (89), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:30:13,428 INFO L276 IsEmpty]: Start isEmpty. Operand 6147 states and 8996 transitions. [2021-11-03 04:30:13,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-03 04:30:13,438 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:13,438 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-03 04:30:13,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-03 04:30:13,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:13,662 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:13,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:13,662 INFO L85 PathProgramCache]: Analyzing trace with hash -423872810, now seen corresponding path program 3 times [2021-11-03 04:30:13,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:13,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131826940] [2021-11-03 04:30:13,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:13,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:13,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:13,964 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:13,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:13,965 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131826940] [2021-11-03 04:30:13,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131826940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:13,965 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942511424] [2021-11-03 04:30:13,965 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:30:13,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:13,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:13,974 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:13,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-03 04:30:14,527 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:30:14,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:14,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-03 04:30:14,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:14,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:15,446 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:15,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942511424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:15,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494220782] [2021-11-03 04:30:15,448 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:30:15,448 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:15,449 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:15,449 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:15,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2021-11-03 04:30:15,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173568218] [2021-11-03 04:30:15,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-03 04:30:15,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:15,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-03 04:30:15,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2021-11-03 04:30:15,452 INFO L87 Difference]: Start difference. First operand 6147 states and 8996 transitions. Second operand has 48 states, 45 states have (on average 3.511111111111111) internal successors, (158), 26 states have internal predecessors, (158), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:17,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:17,112 INFO L93 Difference]: Finished difference Result 9752 states and 13964 transitions. [2021-11-03 04:30:17,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-03 04:30:17,113 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 45 states have (on average 3.511111111111111) internal successors, (158), 26 states have internal predecessors, (158), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2021-11-03 04:30:17,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:17,153 INFO L225 Difference]: With dead ends: 9752 [2021-11-03 04:30:17,153 INFO L226 Difference]: Without dead ends: 9751 [2021-11-03 04:30:17,160 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2021-11-03 04:30:17,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9751 states. [2021-11-03 04:30:17,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9751 to 9411. [2021-11-03 04:30:17,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9411 states, 6082 states have (on average 1.0320618217691548) internal successors, (6277), 6011 states have internal predecessors, (6277), 1865 states have call successors, (1865), 183 states have call predecessors, (1865), 1461 states have return successors, (5462), 3216 states have call predecessors, (5462), 1850 states have call successors, (5462) [2021-11-03 04:30:17,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9411 states to 9411 states and 13604 transitions. [2021-11-03 04:30:17,893 INFO L78 Accepts]: Start accepts. Automaton has 9411 states and 13604 transitions. Word has length 91 [2021-11-03 04:30:17,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:17,894 INFO L470 AbstractCegarLoop]: Abstraction has 9411 states and 13604 transitions. [2021-11-03 04:30:17,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 45 states have (on average 3.511111111111111) internal successors, (158), 26 states have internal predecessors, (158), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:17,894 INFO L276 IsEmpty]: Start isEmpty. Operand 9411 states and 13604 transitions. [2021-11-03 04:30:17,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-03 04:30:17,908 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:17,908 INFO L513 BasicCegarLoop]: trace histogram [16, 11, 10, 8, 8, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-03 04:30:17,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:18,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:18,122 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:18,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:18,122 INFO L85 PathProgramCache]: Analyzing trace with hash -734550578, now seen corresponding path program 3 times [2021-11-03 04:30:18,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:18,123 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370321558] [2021-11-03 04:30:18,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:18,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:18,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:18,232 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 246 proven. 52 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2021-11-03 04:30:18,233 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:18,233 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370321558] [2021-11-03 04:30:18,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370321558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:18,233 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794488122] [2021-11-03 04:30:18,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:30:18,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:18,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:18,235 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:18,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-03 04:30:18,952 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:30:18,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:18,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 04:30:18,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:19,293 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 233 proven. 64 refuted. 0 times theorem prover too weak. 271 trivial. 0 not checked. [2021-11-03 04:30:19,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:20,858 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 237 proven. 111 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-03 04:30:20,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794488122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:20,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176207546] [2021-11-03 04:30:20,860 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:30:20,860 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:20,860 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:20,861 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:20,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 13] total 17 [2021-11-03 04:30:20,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720023197] [2021-11-03 04:30:20,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-03 04:30:20,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:20,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-03 04:30:20,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-11-03 04:30:20,862 INFO L87 Difference]: Start difference. First operand 9411 states and 13604 transitions. Second operand has 17 states, 17 states have (on average 5.352941176470588) internal successors, (91), 17 states have internal predecessors, (91), 12 states have call successors, (17), 4 states have call predecessors, (17), 7 states have return successors, (19), 6 states have call predecessors, (19), 10 states have call successors, (19) [2021-11-03 04:30:21,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:21,714 INFO L93 Difference]: Finished difference Result 19790 states and 40674 transitions. [2021-11-03 04:30:21,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 04:30:21,714 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.352941176470588) internal successors, (91), 17 states have internal predecessors, (91), 12 states have call successors, (17), 4 states have call predecessors, (17), 7 states have return successors, (19), 6 states have call predecessors, (19), 10 states have call successors, (19) Word has length 139 [2021-11-03 04:30:21,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:21,808 INFO L225 Difference]: With dead ends: 19790 [2021-11-03 04:30:21,809 INFO L226 Difference]: Without dead ends: 12059 [2021-11-03 04:30:21,870 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 282 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=143, Invalid=363, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:30:21,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12059 states. [2021-11-03 04:30:22,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12059 to 9900. [2021-11-03 04:30:22,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9900 states, 6471 states have (on average 1.033534229639932) internal successors, (6688), 6400 states have internal predecessors, (6688), 1936 states have call successors, (1936), 226 states have call predecessors, (1936), 1490 states have return successors, (5621), 3273 states have call predecessors, (5621), 1913 states have call successors, (5621) [2021-11-03 04:30:22,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14245 transitions. [2021-11-03 04:30:22,980 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14245 transitions. Word has length 139 [2021-11-03 04:30:22,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:22,981 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14245 transitions. [2021-11-03 04:30:22,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.352941176470588) internal successors, (91), 17 states have internal predecessors, (91), 12 states have call successors, (17), 4 states have call predecessors, (17), 7 states have return successors, (19), 6 states have call predecessors, (19), 10 states have call successors, (19) [2021-11-03 04:30:22,981 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14245 transitions. [2021-11-03 04:30:22,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-03 04:30:22,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:22,988 INFO L513 BasicCegarLoop]: trace histogram [14, 12, 10, 10, 10, 10, 9, 9, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:30:23,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:23,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:23,214 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:23,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:23,214 INFO L85 PathProgramCache]: Analyzing trace with hash -641152395, now seen corresponding path program 3 times [2021-11-03 04:30:23,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:23,215 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729010592] [2021-11-03 04:30:23,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:23,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:23,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:23,571 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 246 proven. 185 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-03 04:30:23,572 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:23,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729010592] [2021-11-03 04:30:23,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729010592] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:23,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404632795] [2021-11-03 04:30:23,572 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:30:23,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:23,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:23,573 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:23,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-03 04:30:24,324 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:30:24,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:24,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-03 04:30:24,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:24,636 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 238 proven. 188 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-03 04:30:24,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 258 proven. 173 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-03 04:30:25,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404632795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:25,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1256294471] [2021-11-03 04:30:25,732 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:30:25,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:25,733 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:25,733 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:25,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2021-11-03 04:30:25,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380505911] [2021-11-03 04:30:25,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-03 04:30:25,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:25,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-03 04:30:25,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2021-11-03 04:30:25,735 INFO L87 Difference]: Start difference. First operand 9900 states and 14245 transitions. Second operand has 52 states, 51 states have (on average 2.843137254901961) internal successors, (145), 32 states have internal predecessors, (145), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:30:27,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:27,472 INFO L93 Difference]: Finished difference Result 10597 states and 15041 transitions. [2021-11-03 04:30:27,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-03 04:30:27,472 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.843137254901961) internal successors, (145), 32 states have internal predecessors, (145), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-03 04:30:27,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:27,516 INFO L225 Difference]: With dead ends: 10597 [2021-11-03 04:30:27,516 INFO L226 Difference]: Without dead ends: 10596 [2021-11-03 04:30:27,523 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1858, Invalid=6514, Unknown=0, NotChecked=0, Total=8372 [2021-11-03 04:30:27,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10596 states. [2021-11-03 04:30:28,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10596 to 9900. [2021-11-03 04:30:28,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9900 states, 6471 states have (on average 1.0312161953330243) internal successors, (6673), 6400 states have internal predecessors, (6673), 1936 states have call successors, (1936), 226 states have call predecessors, (1936), 1490 states have return successors, (5621), 3273 states have call predecessors, (5621), 1913 states have call successors, (5621) [2021-11-03 04:30:28,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14230 transitions. [2021-11-03 04:30:28,367 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14230 transitions. Word has length 120 [2021-11-03 04:30:28,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:28,367 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14230 transitions. [2021-11-03 04:30:28,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.843137254901961) internal successors, (145), 32 states have internal predecessors, (145), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-03 04:30:28,368 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14230 transitions. [2021-11-03 04:30:28,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-03 04:30:28,380 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:28,380 INFO L513 BasicCegarLoop]: trace histogram [14, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:30:28,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:28,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-03 04:30:28,594 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:28,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:28,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1123682148, now seen corresponding path program 4 times [2021-11-03 04:30:28,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:28,595 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781938692] [2021-11-03 04:30:28,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:28,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:28,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:28,948 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 167 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-03 04:30:28,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:28,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781938692] [2021-11-03 04:30:28,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781938692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:28,949 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976700482] [2021-11-03 04:30:28,949 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:30:28,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:28,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:28,950 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:28,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-03 04:30:29,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:29,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-03 04:30:29,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:30,258 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 62 proven. 154 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2021-11-03 04:30:30,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:33,902 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 217 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2021-11-03 04:30:33,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976700482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:33,904 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375618828] [2021-11-03 04:30:33,905 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:30:33,905 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:33,905 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:33,906 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:33,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2021-11-03 04:30:33,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960060490] [2021-11-03 04:30:33,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-03 04:30:33,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:33,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-03 04:30:33,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2021-11-03 04:30:33,908 INFO L87 Difference]: Start difference. First operand 9900 states and 14230 transitions. Second operand has 58 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 44 states have internal predecessors, (95), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2021-11-03 04:30:49,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:49,487 INFO L93 Difference]: Finished difference Result 70704 states and 137719 transitions. [2021-11-03 04:30:49,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2021-11-03 04:30:49,487 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 44 states have internal predecessors, (95), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) Word has length 127 [2021-11-03 04:30:49,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:50,001 INFO L225 Difference]: With dead ends: 70704 [2021-11-03 04:30:50,001 INFO L226 Difference]: Without dead ends: 69682 [2021-11-03 04:30:50,078 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70021 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=25690, Invalid=135512, Unknown=0, NotChecked=0, Total=161202 [2021-11-03 04:30:50,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69682 states. [2021-11-03 04:30:53,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69682 to 17261. [2021-11-03 04:30:53,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17261 states, 10969 states have (on average 1.0209681830613546) internal successors, (11199), 10898 states have internal predecessors, (11199), 3500 states have call successors, (3500), 286 states have call predecessors, (3500), 2789 states have return successors, (13865), 6076 states have call predecessors, (13865), 3470 states have call successors, (13865) [2021-11-03 04:30:53,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17261 states to 17261 states and 28564 transitions. [2021-11-03 04:30:53,740 INFO L78 Accepts]: Start accepts. Automaton has 17261 states and 28564 transitions. Word has length 127 [2021-11-03 04:30:53,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:53,741 INFO L470 AbstractCegarLoop]: Abstraction has 17261 states and 28564 transitions. [2021-11-03 04:30:53,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 44 states have internal predecessors, (95), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2021-11-03 04:30:53,741 INFO L276 IsEmpty]: Start isEmpty. Operand 17261 states and 28564 transitions. [2021-11-03 04:30:53,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-03 04:30:53,772 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:53,772 INFO L513 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-03 04:30:53,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:54,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-03 04:30:54,001 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:30:54,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:54,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1587050034, now seen corresponding path program 4 times [2021-11-03 04:30:54,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:54,001 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140830448] [2021-11-03 04:30:54,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:54,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:54,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:54,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:54,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:54,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140830448] [2021-11-03 04:30:54,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140830448] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:54,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728416003] [2021-11-03 04:30:54,902 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:30:54,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:54,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:54,906 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:54,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-03 04:30:55,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:55,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-03 04:30:55,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:56,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:56,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:58,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:58,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728416003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:58,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032951530] [2021-11-03 04:30:58,514 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:30:58,514 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:58,514 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:30:58,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:58,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2021-11-03 04:30:58,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964825545] [2021-11-03 04:30:58,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-03 04:30:58,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:58,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-03 04:30:58,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2021-11-03 04:30:58,518 INFO L87 Difference]: Start difference. First operand 17261 states and 28564 transitions. Second operand has 96 states, 93 states have (on average 3.5053763440860215) internal successors, (326), 50 states have internal predecessors, (326), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:31:03,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:31:03,952 INFO L93 Difference]: Finished difference Result 28594 states and 45424 transitions. [2021-11-03 04:31:03,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-03 04:31:03,952 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 93 states have (on average 3.5053763440860215) internal successors, (326), 50 states have internal predecessors, (326), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 187 [2021-11-03 04:31:03,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:31:04,044 INFO L225 Difference]: With dead ends: 28594 [2021-11-03 04:31:04,045 INFO L226 Difference]: Without dead ends: 28593 [2021-11-03 04:31:04,058 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8376 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=10814, Invalid=23968, Unknown=0, NotChecked=0, Total=34782 [2021-11-03 04:31:04,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28593 states. [2021-11-03 04:31:06,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28593 to 27869. [2021-11-03 04:31:06,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27869 states, 17641 states have (on average 1.0184796780227878) internal successors, (17967), 17474 states have internal predecessors, (17967), 5564 states have call successors, (5564), 382 states have call predecessors, (5564), 4661 states have return successors, (21137), 10012 states have call predecessors, (21137), 5534 states have call successors, (21137) [2021-11-03 04:31:06,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27869 states to 27869 states and 44668 transitions. [2021-11-03 04:31:06,174 INFO L78 Accepts]: Start accepts. Automaton has 27869 states and 44668 transitions. Word has length 187 [2021-11-03 04:31:06,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:31:06,174 INFO L470 AbstractCegarLoop]: Abstraction has 27869 states and 44668 transitions. [2021-11-03 04:31:06,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 93 states have (on average 3.5053763440860215) internal successors, (326), 50 states have internal predecessors, (326), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:31:06,175 INFO L276 IsEmpty]: Start isEmpty. Operand 27869 states and 44668 transitions. [2021-11-03 04:31:06,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-03 04:31:06,214 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:31:06,214 INFO L513 BasicCegarLoop]: trace histogram [28, 21, 19, 15, 15, 15, 14, 14, 14, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-03 04:31:06,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-03 04:31:06,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-03 04:31:06,430 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:31:06,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:31:06,430 INFO L85 PathProgramCache]: Analyzing trace with hash -2080743856, now seen corresponding path program 1 times [2021-11-03 04:31:06,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:31:06,430 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604601227] [2021-11-03 04:31:06,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:31:06,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:31:06,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:31:06,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 488 proven. 278 refuted. 0 times theorem prover too weak. 1274 trivial. 0 not checked. [2021-11-03 04:31:06,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:31:06,824 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604601227] [2021-11-03 04:31:06,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604601227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:31:06,824 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286188215] [2021-11-03 04:31:06,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:31:06,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:31:06,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:31:06,825 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:31:06,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f18e9eae-f7f9-4984-bb12-8b863d5fc3d5/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-03 04:31:07,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:31:07,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-03 04:31:07,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:31:08,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 784 proven. 324 refuted. 0 times theorem prover too weak. 932 trivial. 0 not checked. [2021-11-03 04:31:08,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:31:12,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 807 proven. 436 refuted. 0 times theorem prover too weak. 797 trivial. 0 not checked. [2021-11-03 04:31:12,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286188215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:31:12,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647576139] [2021-11-03 04:31:12,141 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-03 04:31:12,141 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:31:12,142 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-03 04:31:12,143 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:31:12,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2021-11-03 04:31:12,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151483943] [2021-11-03 04:31:12,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-03 04:31:12,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:31:12,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-03 04:31:12,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2021-11-03 04:31:12,145 INFO L87 Difference]: Start difference. First operand 27869 states and 44668 transitions. Second operand has 50 states, 50 states have (on average 3.08) internal successors, (154), 38 states have internal predecessors, (154), 23 states have call successors, (26), 3 states have call predecessors, (26), 20 states have return successors, (47), 27 states have call predecessors, (47), 21 states have call successors, (47) [2021-11-03 04:31:42,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:31:42,782 INFO L93 Difference]: Finished difference Result 207634 states and 800017 transitions. [2021-11-03 04:31:42,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 375 states. [2021-11-03 04:31:42,782 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.08) internal successors, (154), 38 states have internal predecessors, (154), 23 states have call successors, (26), 3 states have call predecessors, (26), 20 states have return successors, (47), 27 states have call predecessors, (47), 21 states have call successors, (47) Word has length 254 [2021-11-03 04:31:42,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:31:46,271 INFO L225 Difference]: With dead ends: 207634 [2021-11-03 04:31:46,272 INFO L226 Difference]: Without dead ends: 185477 [2021-11-03 04:31:47,185 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 921 GetRequests, 498 SyntacticMatches, 3 SemanticMatches, 420 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73604 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=24328, Invalid=153334, Unknown=0, NotChecked=0, Total=177662 [2021-11-03 04:31:47,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185477 states.