./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V --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 32bit --witnessprinter.graph.data.programhash c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:14:54,984 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:14:54,986 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:14:55,019 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:14:55,020 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:14:55,022 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:14:55,024 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:14:55,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:14:55,029 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:14:55,030 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:14:55,032 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:14:55,033 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:14:55,034 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:14:55,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:14:55,038 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:14:55,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:14:55,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:14:55,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:14:55,044 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:14:55,047 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:14:55,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:14:55,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:14:55,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:14:55,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:14:55,058 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:14:55,059 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:14:55,059 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:14:55,061 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:14:55,061 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:14:55,063 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:14:55,063 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:14:55,064 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:14:55,065 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:14:55,066 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:14:55,068 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:14:55,068 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:14:55,069 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:14:55,070 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:14:55,070 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:14:55,071 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:14:55,073 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:14:55,074 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-23 02:14:55,102 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:14:55,103 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:14:55,103 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:14:55,104 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:14:55,105 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:14:55,105 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:14:55,106 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:14:55,106 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:14:55,107 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:14:55,107 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:14:55,107 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:14:55,108 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:14:55,108 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:14:55,109 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:14:55,109 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:14:55,110 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:14:55,110 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:14:55,110 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:14:55,111 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:14:55,111 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:14:55,112 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 02:14:55,112 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:14:55,112 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:14:55,112 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:14:55,113 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:14:55,113 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:14:55,113 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:14:55,113 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-23 02:14:55,114 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:14:55,114 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:14:55,114 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:14:55,114 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:14:55,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:14:55,115 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:14:55,115 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:14:55,116 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:14:55,116 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:14:55,116 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:14:55,116 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:14:55,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:14:55,117 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:14:55,117 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:14:55,117 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:14:55,118 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_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2021-11-23 02:14:55,413 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:14:55,449 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:14:55,453 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:14:55,454 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:14:55,455 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:14:55,457 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/recursive/Ackermann03.c [2021-11-23 02:14:55,539 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/data/e9825e0c0/a596129449924a4e9ac9bf5a8352c26d/FLAG59b34710d [2021-11-23 02:14:56,088 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:14:56,089 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/sv-benchmarks/c/recursive/Ackermann03.c [2021-11-23 02:14:56,095 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/data/e9825e0c0/a596129449924a4e9ac9bf5a8352c26d/FLAG59b34710d [2021-11-23 02:14:56,472 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/data/e9825e0c0/a596129449924a4e9ac9bf5a8352c26d [2021-11-23 02:14:56,477 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:14:56,479 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:14:56,481 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:14:56,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:14:56,486 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:14:56,487 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53b8358c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56, skipping insertion in model container [2021-11-23 02:14:56,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,497 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:14:56,514 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:14:56,696 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2021-11-23 02:14:56,697 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:14:56,706 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:14:56,721 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2021-11-23 02:14:56,722 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:14:56,733 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:14:56,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56 WrapperNode [2021-11-23 02:14:56,733 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:14:56,734 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:14:56,734 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:14:56,735 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:14:56,743 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,751 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,769 INFO L137 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 32 [2021-11-23 02:14:56,769 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:14:56,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:14:56,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:14:56,770 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:14:56,779 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,779 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,781 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,781 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,784 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,789 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:14:56,790 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:14:56,791 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:14:56,791 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:14:56,792 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (1/1) ... [2021-11-23 02:14:56,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:14:56,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:56,844 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:14:56,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:14:56,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:14:56,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:14:56,898 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:14:56,898 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-23 02:14:56,898 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-23 02:14:56,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:14:56,957 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:14:56,958 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:14:57,106 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:14:57,128 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:14:57,128 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:14:57,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:14:57 BoogieIcfgContainer [2021-11-23 02:14:57,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:14:57,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:14:57,134 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:14:57,138 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:14:57,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:14:56" (1/3) ... [2021-11-23 02:14:57,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@704c5fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:14:57, skipping insertion in model container [2021-11-23 02:14:57,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:56" (2/3) ... [2021-11-23 02:14:57,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@704c5fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:14:57, skipping insertion in model container [2021-11-23 02:14:57,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:14:57" (3/3) ... [2021-11-23 02:14:57,141 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2021-11-23 02:14:57,147 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:14:57,148 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2021-11-23 02:14:57,199 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:14:57,209 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 [2021-11-23 02:14:57,209 INFO L340 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-11-23 02:14:57,230 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) [2021-11-23 02:14:57,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:14:57,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:57,236 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:57,237 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:57,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:57,244 INFO L85 PathProgramCache]: Analyzing trace with hash 401720455, now seen corresponding path program 1 times [2021-11-23 02:14:57,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:57,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110463053] [2021-11-23 02:14:57,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:57,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:57,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:57,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:57,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:57,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110463053] [2021-11-23 02:14:57,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110463053] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:57,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:57,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:14:57,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166758159] [2021-11-23 02:14:57,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:57,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:14:57,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:57,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:14:57,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:57,552 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) [2021-11-23 02:14:57,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:57,703 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2021-11-23 02:14:57,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:14:57,706 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 [2021-11-23 02:14:57,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:57,716 INFO L225 Difference]: With dead ends: 65 [2021-11-23 02:14:57,717 INFO L226 Difference]: Without dead ends: 58 [2021-11-23 02:14:57,720 INFO L932 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 [2021-11-23 02:14:57,725 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 52 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:57,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 101 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:14:57,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-23 02:14:57,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-11-23 02:14:57,776 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) [2021-11-23 02:14:57,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-11-23 02:14:57,781 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2021-11-23 02:14:57,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:57,782 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-11-23 02:14:57,783 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) [2021-11-23 02:14:57,783 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-11-23 02:14:57,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:14:57,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:57,784 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:57,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:14:57,785 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:57,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:57,786 INFO L85 PathProgramCache]: Analyzing trace with hash -431562724, now seen corresponding path program 1 times [2021-11-23 02:14:57,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:57,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811731673] [2021-11-23 02:14:57,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:57,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:57,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:57,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:57,896 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:57,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811731673] [2021-11-23 02:14:57,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811731673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:57,897 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:57,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:14:57,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499118852] [2021-11-23 02:14:57,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:57,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:14:57,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:57,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:14:57,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:57,905 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) [2021-11-23 02:14:57,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:57,997 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2021-11-23 02:14:57,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:14:57,998 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 [2021-11-23 02:14:57,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:58,000 INFO L225 Difference]: With dead ends: 50 [2021-11-23 02:14:58,005 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 02:14:58,006 INFO L932 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 [2021-11-23 02:14:58,009 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:58,012 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:14:58,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 02:14:58,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-23 02:14:58,023 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) [2021-11-23 02:14:58,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-23 02:14:58,027 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 8 [2021-11-23 02:14:58,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:58,027 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-23 02:14:58,028 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) [2021-11-23 02:14:58,028 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-23 02:14:58,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:14:58,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:58,029 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:58,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:14:58,030 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:58,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:58,031 INFO L85 PathProgramCache]: Analyzing trace with hash -431567721, now seen corresponding path program 1 times [2021-11-23 02:14:58,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:58,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678589343] [2021-11-23 02:14:58,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:58,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:58,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:58,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:58,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:58,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678589343] [2021-11-23 02:14:58,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678589343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:58,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:58,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:14:58,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777313444] [2021-11-23 02:14:58,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:58,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:14:58,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:58,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:14:58,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:58,080 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) [2021-11-23 02:14:58,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:58,174 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2021-11-23 02:14:58,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:14:58,175 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 [2021-11-23 02:14:58,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:58,179 INFO L225 Difference]: With dead ends: 75 [2021-11-23 02:14:58,182 INFO L226 Difference]: Without dead ends: 73 [2021-11-23 02:14:58,183 INFO L932 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 [2021-11-23 02:14:58,185 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 39 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:58,188 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 97 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:14:58,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-23 02:14:58,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-11-23 02:14:58,212 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) [2021-11-23 02:14:58,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2021-11-23 02:14:58,224 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 8 [2021-11-23 02:14:58,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:58,226 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2021-11-23 02:14:58,227 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) [2021-11-23 02:14:58,227 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2021-11-23 02:14:58,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:14:58,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:58,229 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:58,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:14:58,230 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:58,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:58,233 INFO L85 PathProgramCache]: Analyzing trace with hash -493542486, now seen corresponding path program 1 times [2021-11-23 02:14:58,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:58,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502926522] [2021-11-23 02:14:58,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:58,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:58,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:58,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:58,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:58,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502926522] [2021-11-23 02:14:58,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502926522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:58,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:58,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:14:58,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415978126] [2021-11-23 02:14:58,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:58,317 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:14:58,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:58,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:14:58,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:58,320 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) [2021-11-23 02:14:58,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:58,440 INFO L93 Difference]: Finished difference Result 115 states and 153 transitions. [2021-11-23 02:14:58,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:14:58,441 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 [2021-11-23 02:14:58,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:58,447 INFO L225 Difference]: With dead ends: 115 [2021-11-23 02:14:58,448 INFO L226 Difference]: Without dead ends: 107 [2021-11-23 02:14:58,449 INFO L932 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 [2021-11-23 02:14:58,459 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 39 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:58,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 96 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:14:58,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-23 02:14:58,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 99. [2021-11-23 02:14:58,497 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) [2021-11-23 02:14:58,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2021-11-23 02:14:58,499 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2021-11-23 02:14:58,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:58,500 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2021-11-23 02:14:58,500 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) [2021-11-23 02:14:58,500 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2021-11-23 02:14:58,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:14:58,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:58,501 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:58,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:14:58,502 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:58,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:58,502 INFO L85 PathProgramCache]: Analyzing trace with hash 349584333, now seen corresponding path program 1 times [2021-11-23 02:14:58,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:58,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851681699] [2021-11-23 02:14:58,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:58,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:58,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:58,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:58,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:58,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851681699] [2021-11-23 02:14:58,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851681699] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:58,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:58,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:14:58,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29388051] [2021-11-23 02:14:58,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:58,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:14:58,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:58,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:14:58,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:14:58,559 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) [2021-11-23 02:14:58,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:58,647 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2021-11-23 02:14:58,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:14:58,648 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 [2021-11-23 02:14:58,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:58,650 INFO L225 Difference]: With dead ends: 167 [2021-11-23 02:14:58,650 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 02:14:58,652 INFO L932 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 [2021-11-23 02:14:58,658 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:58,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 83 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:14:58,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 02:14:58,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-11-23 02:14:58,678 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) [2021-11-23 02:14:58,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2021-11-23 02:14:58,680 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 15 [2021-11-23 02:14:58,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:58,681 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2021-11-23 02:14:58,681 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) [2021-11-23 02:14:58,682 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2021-11-23 02:14:58,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:14:58,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:58,683 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:58,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:14:58,683 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:58,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:58,684 INFO L85 PathProgramCache]: Analyzing trace with hash 349591284, now seen corresponding path program 1 times [2021-11-23 02:14:58,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:58,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478393484] [2021-11-23 02:14:58,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:58,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:58,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:58,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:58,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478393484] [2021-11-23 02:14:58,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478393484] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:58,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794020109] [2021-11-23 02:14:58,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:58,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:58,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:58,750 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:58,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:14:58,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:58,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:14:58,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:58,916 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:58,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:58,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:59,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794020109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:59,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542577902] [2021-11-23 02:14:59,019 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:14:59,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:14:59,024 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:610) 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) [2021-11-23 02:14:59,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:14:59,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-23 02:14:59,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140683232] [2021-11-23 02:14:59,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:14:59,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:14:59,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:59,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:14:59,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:14:59,028 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) [2021-11-23 02:14:59,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:59,354 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2021-11-23 02:14:59,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:14:59,355 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 [2021-11-23 02:14:59,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:59,368 INFO L225 Difference]: With dead ends: 273 [2021-11-23 02:14:59,368 INFO L226 Difference]: Without dead ends: 271 [2021-11-23 02:14:59,369 INFO L932 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 [2021-11-23 02:14:59,371 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 302 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:59,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 166 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:14:59,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-23 02:14:59,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2021-11-23 02:14:59,433 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) [2021-11-23 02:14:59,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2021-11-23 02:14:59,438 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 15 [2021-11-23 02:14:59,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:59,438 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2021-11-23 02:14:59,438 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) [2021-11-23 02:14:59,439 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2021-11-23 02:14:59,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:14:59,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:59,448 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:59,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:59,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:14:59,650 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:14:59,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:59,651 INFO L85 PathProgramCache]: Analyzing trace with hash 903853037, now seen corresponding path program 1 times [2021-11-23 02:14:59,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:59,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705502182] [2021-11-23 02:14:59,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:59,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:59,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:59,709 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:59,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:59,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705502182] [2021-11-23 02:14:59,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705502182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:59,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14185434] [2021-11-23 02:14:59,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:59,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:59,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:59,711 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:59,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:14:59,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:59,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:14:59,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:59,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:59,839 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:14:59,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14185434] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:59,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:14:59,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2021-11-23 02:14:59,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188661303] [2021-11-23 02:14:59,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:59,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:14:59,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:59,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:14:59,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:14:59,842 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 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) [2021-11-23 02:14:59,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:59,957 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2021-11-23 02:14:59,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:14:59,958 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 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 16 [2021-11-23 02:14:59,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:59,963 INFO L225 Difference]: With dead ends: 327 [2021-11-23 02:14:59,963 INFO L226 Difference]: Without dead ends: 326 [2021-11-23 02:14:59,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:14:59,968 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 49 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:59,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 85 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:14:59,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-23 02:14:59,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2021-11-23 02:14:59,999 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) [2021-11-23 02:15:00,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2021-11-23 02:15:00,004 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 16 [2021-11-23 02:15:00,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:00,005 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2021-11-23 02:15:00,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 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) [2021-11-23 02:15:00,005 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2021-11-23 02:15:00,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:15:00,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:00,006 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:00,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 02:15:00,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:00,234 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:00,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:00,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1691461981, now seen corresponding path program 1 times [2021-11-23 02:15:00,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:00,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305237943] [2021-11-23 02:15:00,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:00,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:00,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:00,322 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:00,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:00,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305237943] [2021-11-23 02:15:00,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305237943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:00,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202007653] [2021-11-23 02:15:00,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:00,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:00,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:00,339 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:00,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:15:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:00,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:15:00,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:00,459 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:00,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:00,555 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:00,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202007653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:00,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617119150] [2021-11-23 02:15:00,560 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:15:00,560 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:00,560 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:610) 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) [2021-11-23 02:15:00,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:00,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-23 02:15:00,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557023953] [2021-11-23 02:15:00,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:00,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:15:00,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:00,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:15:00,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:15:00,567 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) [2021-11-23 02:15:00,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:00,827 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2021-11-23 02:15:00,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:15:00,828 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 [2021-11-23 02:15:00,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:00,834 INFO L225 Difference]: With dead ends: 590 [2021-11-23 02:15:00,835 INFO L226 Difference]: Without dead ends: 589 [2021-11-23 02:15:00,836 INFO L932 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 [2021-11-23 02:15:00,837 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 185 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:00,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 184 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:00,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-23 02:15:00,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2021-11-23 02:15:00,891 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) [2021-11-23 02:15:00,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2021-11-23 02:15:00,898 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 19 [2021-11-23 02:15:00,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:00,898 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2021-11-23 02:15:00,898 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) [2021-11-23 02:15:00,899 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2021-11-23 02:15:00,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:15:00,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:00,907 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:00,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:01,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:01,118 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:01,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:01,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1177154428, now seen corresponding path program 1 times [2021-11-23 02:15:01,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:01,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188726882] [2021-11-23 02:15:01,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:01,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:01,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:01,225 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:15:01,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:01,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188726882] [2021-11-23 02:15:01,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188726882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:01,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247135684] [2021-11-23 02:15:01,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:01,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:01,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:01,228 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:01,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:15:01,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:01,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:15:01,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:01,366 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:15:01,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:15:01,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247135684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:01,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216165701] [2021-11-23 02:15:01,545 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 02:15:01,545 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:01,546 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:610) 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) [2021-11-23 02:15:01,546 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:01,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-23 02:15:01,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514354164] [2021-11-23 02:15:01,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:01,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:15:01,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:01,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:15:01,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:15:01,549 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) [2021-11-23 02:15:01,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:01,840 INFO L93 Difference]: Finished difference Result 824 states and 1154 transitions. [2021-11-23 02:15:01,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:15:01,841 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 [2021-11-23 02:15:01,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:01,849 INFO L225 Difference]: With dead ends: 824 [2021-11-23 02:15:01,849 INFO L226 Difference]: Without dead ends: 822 [2021-11-23 02:15:01,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:15:01,854 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 135 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:01,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 109 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:01,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-11-23 02:15:01,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 747. [2021-11-23 02:15:01,924 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) [2021-11-23 02:15:01,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 952 transitions. [2021-11-23 02:15:01,936 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 952 transitions. Word has length 23 [2021-11-23 02:15:01,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:01,936 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 952 transitions. [2021-11-23 02:15:01,936 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) [2021-11-23 02:15:01,937 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 952 transitions. [2021-11-23 02:15:01,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 02:15:01,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:01,939 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:01,973 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-23 02:15:02,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:02,159 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:02,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:02,160 INFO L85 PathProgramCache]: Analyzing trace with hash 2132048962, now seen corresponding path program 1 times [2021-11-23 02:15:02,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:02,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991957375] [2021-11-23 02:15:02,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:02,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:02,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:02,239 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:15:02,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991957375] [2021-11-23 02:15:02,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [991957375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050625417] [2021-11-23 02:15:02,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:02,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:02,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:02,241 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:02,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:15:02,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:02,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:15:02,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:02,360 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:15:02,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:02,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050625417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:02,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:02,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 10 [2021-11-23 02:15:02,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377646975] [2021-11-23 02:15:02,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:02,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:15:02,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:02,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:15:02,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:15:02,363 INFO L87 Difference]: Start difference. First operand 747 states and 952 transitions. Second operand has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 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) [2021-11-23 02:15:02,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:02,485 INFO L93 Difference]: Finished difference Result 756 states and 962 transitions. [2021-11-23 02:15:02,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:15:02,486 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 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 24 [2021-11-23 02:15:02,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:02,492 INFO L225 Difference]: With dead ends: 756 [2021-11-23 02:15:02,493 INFO L226 Difference]: Without dead ends: 755 [2021-11-23 02:15:02,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:15:02,494 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 41 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:02,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 103 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:15:02,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-23 02:15:02,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 746. [2021-11-23 02:15:02,549 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) [2021-11-23 02:15:02,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2021-11-23 02:15:02,558 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2021-11-23 02:15:02,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:02,558 INFO L470 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2021-11-23 02:15:02,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 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) [2021-11-23 02:15:02,559 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2021-11-23 02:15:02,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:15:02,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:02,560 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:02,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:02,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:02,774 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:02,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:02,774 INFO L85 PathProgramCache]: Analyzing trace with hash 2049869032, now seen corresponding path program 1 times [2021-11-23 02:15:02,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:02,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44317562] [2021-11-23 02:15:02,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:02,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:02,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:02,880 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:15:02,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:02,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44317562] [2021-11-23 02:15:02,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44317562] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:02,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939669866] [2021-11-23 02:15:02,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:02,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:02,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:02,882 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:02,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:15:02,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:02,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:15:02,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:15:03,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:03,205 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:15:03,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939669866] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:03,206 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:15:03,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2021-11-23 02:15:03,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108231794] [2021-11-23 02:15:03,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:03,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:15:03,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:03,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:15:03,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:15:03,211 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) [2021-11-23 02:15:03,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:03,433 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2021-11-23 02:15:03,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:15:03,434 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 [2021-11-23 02:15:03,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:03,443 INFO L225 Difference]: With dead ends: 901 [2021-11-23 02:15:03,443 INFO L226 Difference]: Without dead ends: 900 [2021-11-23 02:15:03,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:15:03,445 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 52 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:03,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 107 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:03,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-23 02:15:03,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2021-11-23 02:15:03,518 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) [2021-11-23 02:15:03,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2021-11-23 02:15:03,529 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 27 [2021-11-23 02:15:03,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:03,529 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2021-11-23 02:15:03,530 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) [2021-11-23 02:15:03,530 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2021-11-23 02:15:03,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:15:03,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:03,532 INFO L514 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] [2021-11-23 02:15:03,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:03,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:15:03,754 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:03,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:03,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1228982289, now seen corresponding path program 1 times [2021-11-23 02:15:03,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:03,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603085025] [2021-11-23 02:15:03,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:03,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:03,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:03,836 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:03,837 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:03,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603085025] [2021-11-23 02:15:03,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603085025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:03,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335107350] [2021-11-23 02:15:03,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:03,838 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:03,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:03,842 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:03,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:15:03,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:03,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:15:03,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:03,987 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:03,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:04,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335107350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:04,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [54248871] [2021-11-23 02:15:04,239 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-23 02:15:04,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:04,240 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:610) 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) [2021-11-23 02:15:04,241 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:04,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-23 02:15:04,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301566731] [2021-11-23 02:15:04,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:04,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:15:04,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:04,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:15:04,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:15:04,244 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) [2021-11-23 02:15:04,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:04,913 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2021-11-23 02:15:04,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:15:04,914 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 [2021-11-23 02:15:04,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:04,929 INFO L225 Difference]: With dead ends: 1544 [2021-11-23 02:15:04,930 INFO L226 Difference]: Without dead ends: 1542 [2021-11-23 02:15:04,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:15:04,933 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 104 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:04,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 192 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:15:04,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2021-11-23 02:15:05,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2021-11-23 02:15:05,070 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) [2021-11-23 02:15:05,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2021-11-23 02:15:05,086 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 32 [2021-11-23 02:15:05,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:05,086 INFO L470 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2021-11-23 02:15:05,086 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) [2021-11-23 02:15:05,087 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2021-11-23 02:15:05,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 02:15:05,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:05,088 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:05,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:05,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:15:05,302 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:05,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:05,302 INFO L85 PathProgramCache]: Analyzing trace with hash -845541166, now seen corresponding path program 2 times [2021-11-23 02:15:05,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:05,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602821542] [2021-11-23 02:15:05,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:05,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:05,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:05,387 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:15:05,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:05,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602821542] [2021-11-23 02:15:05,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602821542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:05,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080808587] [2021-11-23 02:15:05,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:05,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:05,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:05,389 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:05,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:15:05,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:15:05,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:05,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:15:05,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:05,527 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:15:05,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:05,763 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:15:05,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080808587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:05,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481273734] [2021-11-23 02:15:05,766 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 02:15:05,766 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:05,766 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:610) 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) [2021-11-23 02:15:05,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:05,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-23 02:15:05,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192247244] [2021-11-23 02:15:05,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:05,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:15:05,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:05,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:15:05,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:15:05,769 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) [2021-11-23 02:15:06,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:06,532 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2021-11-23 02:15:06,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:15:06,533 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 [2021-11-23 02:15:06,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:06,556 INFO L225 Difference]: With dead ends: 2153 [2021-11-23 02:15:06,556 INFO L226 Difference]: Without dead ends: 2119 [2021-11-23 02:15:06,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:15:06,560 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 282 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:06,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 164 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:15:06,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-11-23 02:15:06,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1968. [2021-11-23 02:15:06,736 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) [2021-11-23 02:15:06,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1968 states to 1968 states and 2844 transitions. [2021-11-23 02:15:06,761 INFO L78 Accepts]: Start accepts. Automaton has 1968 states and 2844 transitions. Word has length 35 [2021-11-23 02:15:06,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:06,762 INFO L470 AbstractCegarLoop]: Abstraction has 1968 states and 2844 transitions. [2021-11-23 02:15:06,762 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) [2021-11-23 02:15:06,762 INFO L276 IsEmpty]: Start isEmpty. Operand 1968 states and 2844 transitions. [2021-11-23 02:15:06,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:15:06,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:06,765 INFO L514 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] [2021-11-23 02:15:06,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:06,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:15:06,986 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:06,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:06,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1557551067, now seen corresponding path program 1 times [2021-11-23 02:15:06,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:06,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184061102] [2021-11-23 02:15:06,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:06,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:07,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:07,090 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:07,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:07,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184061102] [2021-11-23 02:15:07,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184061102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:07,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121609989] [2021-11-23 02:15:07,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:07,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:07,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:07,092 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:07,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:15:07,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:07,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:15:07,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:07,233 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:07,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:07,491 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:07,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121609989] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:07,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:15:07,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2021-11-23 02:15:07,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416844102] [2021-11-23 02:15:07,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:07,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:15:07,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:07,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:15:07,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:15:07,495 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) [2021-11-23 02:15:07,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:07,863 INFO L93 Difference]: Finished difference Result 2200 states and 3487 transitions. [2021-11-23 02:15:07,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:15:07,863 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 [2021-11-23 02:15:07,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:07,884 INFO L225 Difference]: With dead ends: 2200 [2021-11-23 02:15:07,884 INFO L226 Difference]: Without dead ends: 2199 [2021-11-23 02:15:07,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:15:07,887 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 60 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:07,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 146 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:15:07,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-11-23 02:15:08,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 1976. [2021-11-23 02:15:08,080 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) [2021-11-23 02:15:08,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1976 states to 1976 states and 2707 transitions. [2021-11-23 02:15:08,102 INFO L78 Accepts]: Start accepts. Automaton has 1976 states and 2707 transitions. Word has length 36 [2021-11-23 02:15:08,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:08,103 INFO L470 AbstractCegarLoop]: Abstraction has 1976 states and 2707 transitions. [2021-11-23 02:15:08,103 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) [2021-11-23 02:15:08,104 INFO L276 IsEmpty]: Start isEmpty. Operand 1976 states and 2707 transitions. [2021-11-23 02:15:08,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:15:08,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:08,107 INFO L514 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] [2021-11-23 02:15:08,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:08,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:08,322 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:08,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:08,322 INFO L85 PathProgramCache]: Analyzing trace with hash 791969396, now seen corresponding path program 1 times [2021-11-23 02:15:08,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:08,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61631070] [2021-11-23 02:15:08,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:08,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:08,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:08,385 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:15:08,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:08,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61631070] [2021-11-23 02:15:08,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61631070] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:08,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941492771] [2021-11-23 02:15:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:08,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:08,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:08,387 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:08,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:15:08,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:08,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:15:08,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:08,525 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:15:08,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:08,721 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:15:08,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941492771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:08,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715903213] [2021-11-23 02:15:08,725 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 02:15:08,725 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:08,726 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:610) 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) [2021-11-23 02:15:08,726 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:08,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-23 02:15:08,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251662346] [2021-11-23 02:15:08,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:08,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:15:08,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:08,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:15:08,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:15:08,729 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) [2021-11-23 02:15:08,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:08,969 INFO L93 Difference]: Finished difference Result 3068 states and 4537 transitions. [2021-11-23 02:15:08,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:15:08,970 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 [2021-11-23 02:15:08,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:08,984 INFO L225 Difference]: With dead ends: 3068 [2021-11-23 02:15:08,984 INFO L226 Difference]: Without dead ends: 1692 [2021-11-23 02:15:09,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:15:09,001 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 107 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:09,001 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 71 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:09,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2021-11-23 02:15:09,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1218. [2021-11-23 02:15:09,090 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) [2021-11-23 02:15:09,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1568 transitions. [2021-11-23 02:15:09,098 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1568 transitions. Word has length 42 [2021-11-23 02:15:09,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:09,098 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1568 transitions. [2021-11-23 02:15:09,099 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) [2021-11-23 02:15:09,099 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1568 transitions. [2021-11-23 02:15:09,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:15:09,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:09,101 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:15:09,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:09,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:15:09,322 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:09,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:09,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1872551963, now seen corresponding path program 2 times [2021-11-23 02:15:09,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:09,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161112303] [2021-11-23 02:15:09,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:09,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:09,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:09,437 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:09,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:09,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161112303] [2021-11-23 02:15:09,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161112303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:09,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309647809] [2021-11-23 02:15:09,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:09,439 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:09,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:09,440 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:09,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:15:09,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:15:09,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:09,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:15:09,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:09,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:09,814 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:09,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309647809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:09,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [142281936] [2021-11-23 02:15:09,817 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:15:09,817 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:09,817 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:610) 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) [2021-11-23 02:15:09,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:09,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2021-11-23 02:15:09,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705399169] [2021-11-23 02:15:09,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:09,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:15:09,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:09,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:15:09,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:15:09,820 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) [2021-11-23 02:15:10,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:10,542 INFO L93 Difference]: Finished difference Result 2184 states and 2971 transitions. [2021-11-23 02:15:10,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:15:10,542 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 [2021-11-23 02:15:10,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:10,561 INFO L225 Difference]: With dead ends: 2184 [2021-11-23 02:15:10,561 INFO L226 Difference]: Without dead ends: 2183 [2021-11-23 02:15:10,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:15:10,564 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 528 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:10,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 427 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:15:10,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2021-11-23 02:15:10,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 1938. [2021-11-23 02:15:10,698 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) [2021-11-23 02:15:10,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2468 transitions. [2021-11-23 02:15:10,708 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2468 transitions. Word has length 43 [2021-11-23 02:15:10,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:10,709 INFO L470 AbstractCegarLoop]: Abstraction has 1938 states and 2468 transitions. [2021-11-23 02:15:10,709 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) [2021-11-23 02:15:10,709 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2468 transitions. [2021-11-23 02:15:10,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:15:10,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:10,712 INFO L514 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] [2021-11-23 02:15:10,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:10,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:15:10,933 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:10,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:10,934 INFO L85 PathProgramCache]: Analyzing trace with hash -112901947, now seen corresponding path program 2 times [2021-11-23 02:15:10,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:10,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822716560] [2021-11-23 02:15:10,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:10,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:10,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:15:11,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:11,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822716560] [2021-11-23 02:15:11,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822716560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:11,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803909458] [2021-11-23 02:15:11,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:11,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:11,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:11,032 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:11,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:15:11,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:15:11,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:11,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:15:11,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:11,382 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:15:11,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:15:11,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803909458] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:11,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323757182] [2021-11-23 02:15:11,672 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-23 02:15:11,673 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:11,673 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:610) 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) [2021-11-23 02:15:11,675 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:11,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 13] total 23 [2021-11-23 02:15:11,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371057322] [2021-11-23 02:15:11,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:11,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:15:11,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:11,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:15:11,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:15:11,678 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) [2021-11-23 02:15:12,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:12,805 INFO L93 Difference]: Finished difference Result 3169 states and 4414 transitions. [2021-11-23 02:15:12,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:15:12,806 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 [2021-11-23 02:15:12,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:12,820 INFO L225 Difference]: With dead ends: 3169 [2021-11-23 02:15:12,820 INFO L226 Difference]: Without dead ends: 1492 [2021-11-23 02:15:12,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=379, Invalid=1427, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:15:12,840 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 268 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:12,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 101 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:15:12,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-23 02:15:13,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1397. [2021-11-23 02:15:13,019 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) [2021-11-23 02:15:13,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1779 transitions. [2021-11-23 02:15:13,028 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1779 transitions. Word has length 44 [2021-11-23 02:15:13,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:13,029 INFO L470 AbstractCegarLoop]: Abstraction has 1397 states and 1779 transitions. [2021-11-23 02:15:13,029 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) [2021-11-23 02:15:13,030 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1779 transitions. [2021-11-23 02:15:13,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:15:13,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:13,032 INFO L514 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] [2021-11-23 02:15:13,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:13,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:13,250 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:13,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:13,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1647647435, now seen corresponding path program 1 times [2021-11-23 02:15:13,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:13,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101985335] [2021-11-23 02:15:13,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:13,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:13,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:13,393 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:15:13,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:13,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101985335] [2021-11-23 02:15:13,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101985335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:13,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463205100] [2021-11-23 02:15:13,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:13,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:13,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:13,396 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:13,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:15:13,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:13,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:15:13,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:13,553 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:15:13,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:14,134 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:15:14,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463205100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:14,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330050541] [2021-11-23 02:15:14,137 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:14,137 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:14,138 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:610) 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) [2021-11-23 02:15:14,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:14,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2021-11-23 02:15:14,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414732137] [2021-11-23 02:15:14,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:14,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:15:14,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:14,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:15:14,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:15:14,140 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) [2021-11-23 02:15:16,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:16,826 INFO L93 Difference]: Finished difference Result 4226 states and 7033 transitions. [2021-11-23 02:15:16,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-23 02:15:16,827 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 [2021-11-23 02:15:16,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:16,880 INFO L225 Difference]: With dead ends: 4226 [2021-11-23 02:15:16,880 INFO L226 Difference]: Without dead ends: 4194 [2021-11-23 02:15:16,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2350 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 02:15:16,889 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 165 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 897 mSolverCounterSat, 447 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 1344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 447 IncrementalHoareTripleChecker+Valid, 897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:16,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 226 Invalid, 1344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [447 Valid, 897 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:15:16,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4194 states. [2021-11-23 02:15:17,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4194 to 3143. [2021-11-23 02:15:17,252 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) [2021-11-23 02:15:17,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3143 states to 3143 states and 5466 transitions. [2021-11-23 02:15:17,278 INFO L78 Accepts]: Start accepts. Automaton has 3143 states and 5466 transitions. Word has length 51 [2021-11-23 02:15:17,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:17,279 INFO L470 AbstractCegarLoop]: Abstraction has 3143 states and 5466 transitions. [2021-11-23 02:15:17,279 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) [2021-11-23 02:15:17,279 INFO L276 IsEmpty]: Start isEmpty. Operand 3143 states and 5466 transitions. [2021-11-23 02:15:17,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:15:17,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:17,282 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:17,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:17,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:15:17,498 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:17,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:17,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1010247298, now seen corresponding path program 1 times [2021-11-23 02:15:17,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:17,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372181104] [2021-11-23 02:15:17,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:17,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:17,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:17,694 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 45 proven. 11 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:17,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:17,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372181104] [2021-11-23 02:15:17,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372181104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:17,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247047868] [2021-11-23 02:15:17,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:17,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:17,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:17,696 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:17,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:15:17,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:17,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:15:17,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:17,887 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 37 proven. 14 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:15:17,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:18,694 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 54 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:18,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247047868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:18,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1907481706] [2021-11-23 02:15:18,697 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:18,697 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:18,698 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:610) 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) [2021-11-23 02:15:18,699 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:18,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2021-11-23 02:15:18,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703695373] [2021-11-23 02:15:18,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:18,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:15:18,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:18,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:15:18,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:15:18,701 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) [2021-11-23 02:15:20,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:20,169 INFO L93 Difference]: Finished difference Result 6291 states and 12447 transitions. [2021-11-23 02:15:20,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 02:15:20,169 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 64 [2021-11-23 02:15:20,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:20,209 INFO L225 Difference]: With dead ends: 6291 [2021-11-23 02:15:20,209 INFO L226 Difference]: Without dead ends: 3586 [2021-11-23 02:15:20,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:15:20,265 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 149 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:20,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 276 Invalid, 930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:15:20,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3586 states. [2021-11-23 02:15:20,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3586 to 3481. [2021-11-23 02:15:20,612 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) [2021-11-23 02:15:20,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3481 states to 3481 states and 5298 transitions. [2021-11-23 02:15:20,645 INFO L78 Accepts]: Start accepts. Automaton has 3481 states and 5298 transitions. Word has length 64 [2021-11-23 02:15:20,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:20,646 INFO L470 AbstractCegarLoop]: Abstraction has 3481 states and 5298 transitions. [2021-11-23 02:15:20,647 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) [2021-11-23 02:15:20,647 INFO L276 IsEmpty]: Start isEmpty. Operand 3481 states and 5298 transitions. [2021-11-23 02:15:20,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 02:15:20,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:20,652 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:15:20,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:20,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:20,866 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:20,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:20,866 INFO L85 PathProgramCache]: Analyzing trace with hash 379467222, now seen corresponding path program 2 times [2021-11-23 02:15:20,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:20,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386568978] [2021-11-23 02:15:20,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:20,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:20,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:20,948 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 75 proven. 31 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-23 02:15:20,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:20,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386568978] [2021-11-23 02:15:20,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386568978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:20,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893496975] [2021-11-23 02:15:20,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:20,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:20,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:20,950 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:20,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:15:21,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 02:15:21,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:21,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:15:21,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:21,369 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 28 proven. 48 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2021-11-23 02:15:21,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-23 02:15:22,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893496975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:22,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867483316] [2021-11-23 02:15:22,958 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:22,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:22,959 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:610) 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) [2021-11-23 02:15:22,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:22,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2021-11-23 02:15:22,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637137310] [2021-11-23 02:15:22,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:22,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:15:22,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:22,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:15:22,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:15:22,963 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) [2021-11-23 02:15:31,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:31,462 INFO L93 Difference]: Finished difference Result 17825 states and 38704 transitions. [2021-11-23 02:15:31,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2021-11-23 02:15:31,463 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 79 [2021-11-23 02:15:31,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:31,649 INFO L225 Difference]: With dead ends: 17825 [2021-11-23 02:15:31,649 INFO L226 Difference]: Without dead ends: 14316 [2021-11-23 02:15:31,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15280 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=6608, Invalid=36448, Unknown=0, NotChecked=0, Total=43056 [2021-11-23 02:15:31,815 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 289 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 2510 mSolverCounterSat, 1240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 3750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1240 IncrementalHoareTripleChecker+Valid, 2510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:31,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 317 Invalid, 3750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1240 Valid, 2510 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 02:15:31,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14316 states. [2021-11-23 02:15:33,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14316 to 7630. [2021-11-23 02:15:33,121 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) [2021-11-23 02:15:33,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7630 states to 7630 states and 14701 transitions. [2021-11-23 02:15:33,208 INFO L78 Accepts]: Start accepts. Automaton has 7630 states and 14701 transitions. Word has length 79 [2021-11-23 02:15:33,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:33,209 INFO L470 AbstractCegarLoop]: Abstraction has 7630 states and 14701 transitions. [2021-11-23 02:15:33,209 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) [2021-11-23 02:15:33,209 INFO L276 IsEmpty]: Start isEmpty. Operand 7630 states and 14701 transitions. [2021-11-23 02:15:33,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 02:15:33,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:33,213 INFO L514 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] [2021-11-23 02:15:33,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:33,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-23 02:15:33,426 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:33,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:33,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1101938774, now seen corresponding path program 2 times [2021-11-23 02:15:33,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:33,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315586932] [2021-11-23 02:15:33,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:33,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:33,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:33,658 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 93 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:33,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:33,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315586932] [2021-11-23 02:15:33,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315586932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:33,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665938970] [2021-11-23 02:15:33,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:33,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:33,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:33,661 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:33,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:15:33,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 02:15:33,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:33,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 02:15:33,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:33,925 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 85 proven. 40 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:15:33,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:34,815 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 105 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:34,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665938970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:34,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49761394] [2021-11-23 02:15:34,818 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:34,818 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:34,819 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:610) 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) [2021-11-23 02:15:34,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:34,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2021-11-23 02:15:34,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879807857] [2021-11-23 02:15:34,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:34,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 02:15:34,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:34,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 02:15:34,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:15:34,823 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) [2021-11-23 02:15:37,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:37,148 INFO L93 Difference]: Finished difference Result 14577 states and 29711 transitions. [2021-11-23 02:15:37,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 02:15:37,149 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 [2021-11-23 02:15:37,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:37,210 INFO L225 Difference]: With dead ends: 14577 [2021-11-23 02:15:37,210 INFO L226 Difference]: Without dead ends: 7325 [2021-11-23 02:15:37,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 02:15:37,374 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 256 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 435 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 1248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 435 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:37,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 265 Invalid, 1248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [435 Valid, 813 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:15:37,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7325 states. [2021-11-23 02:15:37,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7325 to 6147. [2021-11-23 02:15:37,963 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) [2021-11-23 02:15:38,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6147 states to 6147 states and 8996 transitions. [2021-11-23 02:15:38,007 INFO L78 Accepts]: Start accepts. Automaton has 6147 states and 8996 transitions. Word has length 80 [2021-11-23 02:15:38,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:38,008 INFO L470 AbstractCegarLoop]: Abstraction has 6147 states and 8996 transitions. [2021-11-23 02:15:38,008 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) [2021-11-23 02:15:38,009 INFO L276 IsEmpty]: Start isEmpty. Operand 6147 states and 8996 transitions. [2021-11-23 02:15:38,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-23 02:15:38,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:38,023 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-23 02:15:38,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:38,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 02:15:38,250 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:38,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:38,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1394163817, now seen corresponding path program 3 times [2021-11-23 02:15:38,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:38,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204472872] [2021-11-23 02:15:38,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:38,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:38,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:38,528 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:38,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:38,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204472872] [2021-11-23 02:15:38,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204472872] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:38,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100529102] [2021-11-23 02:15:38,529 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:15:38,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:38,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:38,530 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:38,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:15:38,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:15:38,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:38,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:15:38,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:38,781 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:38,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:39,327 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:15:39,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100529102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:39,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25003126] [2021-11-23 02:15:39,329 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:15:39,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:39,330 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:610) 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) [2021-11-23 02:15:39,331 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:39,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2021-11-23 02:15:39,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368494846] [2021-11-23 02:15:39,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:39,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 02:15:39,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:39,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 02:15:39,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:15:39,334 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) [2021-11-23 02:15:40,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:40,946 INFO L93 Difference]: Finished difference Result 9752 states and 13964 transitions. [2021-11-23 02:15:40,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-23 02:15:40,948 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 [2021-11-23 02:15:40,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:40,998 INFO L225 Difference]: With dead ends: 9752 [2021-11-23 02:15:40,998 INFO L226 Difference]: Without dead ends: 9751 [2021-11-23 02:15:41,005 INFO L932 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 [2021-11-23 02:15:41,006 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 927 mSDsluCounter, 619 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 931 SdHoareTripleChecker+Valid, 678 SdHoareTripleChecker+Invalid, 1306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:41,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [931 Valid, 678 Invalid, 1306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:15:41,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9751 states. [2021-11-23 02:15:41,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9751 to 9411. [2021-11-23 02:15:41,755 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) [2021-11-23 02:15:41,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9411 states to 9411 states and 13604 transitions. [2021-11-23 02:15:41,802 INFO L78 Accepts]: Start accepts. Automaton has 9411 states and 13604 transitions. Word has length 91 [2021-11-23 02:15:41,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:41,803 INFO L470 AbstractCegarLoop]: Abstraction has 9411 states and 13604 transitions. [2021-11-23 02:15:41,803 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) [2021-11-23 02:15:41,804 INFO L276 IsEmpty]: Start isEmpty. Operand 9411 states and 13604 transitions. [2021-11-23 02:15:41,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 02:15:41,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:41,810 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:15:41,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:42,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 02:15:42,038 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:42,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:42,039 INFO L85 PathProgramCache]: Analyzing trace with hash -1091755801, now seen corresponding path program 3 times [2021-11-23 02:15:42,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:42,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809137905] [2021-11-23 02:15:42,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:42,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:42,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:42,134 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 150 proven. 52 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-23 02:15:42,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:42,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809137905] [2021-11-23 02:15:42,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809137905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:42,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705902796] [2021-11-23 02:15:42,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:15:42,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:42,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:42,136 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:42,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:15:42,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:15:42,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:42,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:15:42,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:42,403 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 182 proven. 26 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 02:15:42,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:43,286 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 149 proven. 59 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 02:15:43,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705902796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:43,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561360363] [2021-11-23 02:15:43,288 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:43,288 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:43,289 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:610) 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) [2021-11-23 02:15:43,290 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:43,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 15 [2021-11-23 02:15:43,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88716777] [2021-11-23 02:15:43,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:43,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:15:43,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:43,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:15:43,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:15:43,292 INFO L87 Difference]: Start difference. First operand 9411 states and 13604 transitions. Second operand has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-23 02:15:44,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:44,092 INFO L93 Difference]: Finished difference Result 19790 states and 40674 transitions. [2021-11-23 02:15:44,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:15:44,093 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) Word has length 107 [2021-11-23 02:15:44,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:44,345 INFO L225 Difference]: With dead ends: 19790 [2021-11-23 02:15:44,346 INFO L226 Difference]: Without dead ends: 12059 [2021-11-23 02:15:44,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 219 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=295, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:15:44,416 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 132 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:44,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 170 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:15:44,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12059 states. [2021-11-23 02:15:45,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12059 to 9900. [2021-11-23 02:15:45,553 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) [2021-11-23 02:15:45,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14245 transitions. [2021-11-23 02:15:45,623 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14245 transitions. Word has length 107 [2021-11-23 02:15:45,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:45,624 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14245 transitions. [2021-11-23 02:15:45,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-23 02:15:45,625 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14245 transitions. [2021-11-23 02:15:45,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 02:15:45,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:45,633 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 9, 9, 9, 9, 8, 8, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:45,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:45,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:45,850 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:45,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:45,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1912996866, now seen corresponding path program 3 times [2021-11-23 02:15:45,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:45,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765399332] [2021-11-23 02:15:45,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:45,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:45,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:46,218 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 189 proven. 185 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:46,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:46,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765399332] [2021-11-23 02:15:46,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765399332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:46,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090205065] [2021-11-23 02:15:46,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:15:46,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:46,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:46,221 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:46,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:15:46,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:15:46,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:46,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:15:46,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:46,551 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 181 proven. 188 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:15:46,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:47,722 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 201 proven. 173 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:15:47,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090205065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:47,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [133508349] [2021-11-23 02:15:47,725 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:47,725 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:47,725 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:610) 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) [2021-11-23 02:15:47,726 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:47,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2021-11-23 02:15:47,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817232409] [2021-11-23 02:15:47,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:47,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 02:15:47,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:47,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 02:15:47,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:15:47,730 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) [2021-11-23 02:15:49,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:49,559 INFO L93 Difference]: Finished difference Result 10597 states and 15041 transitions. [2021-11-23 02:15:49,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 02:15:49,570 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 112 [2021-11-23 02:15:49,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:49,625 INFO L225 Difference]: With dead ends: 10597 [2021-11-23 02:15:49,625 INFO L226 Difference]: Without dead ends: 10596 [2021-11-23 02:15:49,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1858, Invalid=6514, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 02:15:49,634 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 231 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 1106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:49,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 308 Invalid, 1106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:15:49,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10596 states. [2021-11-23 02:15:50,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10596 to 9900. [2021-11-23 02:15:50,274 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) [2021-11-23 02:15:50,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14230 transitions. [2021-11-23 02:15:50,330 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14230 transitions. Word has length 112 [2021-11-23 02:15:50,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:50,331 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14230 transitions. [2021-11-23 02:15:50,331 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) [2021-11-23 02:15:50,332 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14230 transitions. [2021-11-23 02:15:50,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:15:50,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:50,343 INFO L514 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] [2021-11-23 02:15:50,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:50,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:50,558 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:15:50,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:50,558 INFO L85 PathProgramCache]: Analyzing trace with hash 806548701, now seen corresponding path program 4 times [2021-11-23 02:15:50,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:50,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942569126] [2021-11-23 02:15:50,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:50,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:50,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:50,890 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 167 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-23 02:15:50,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:50,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942569126] [2021-11-23 02:15:50,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942569126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:50,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027481092] [2021-11-23 02:15:50,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:15:50,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:50,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:50,898 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:50,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:15:51,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:51,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 02:15:51,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 62 proven. 154 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2021-11-23 02:15:51,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:55,508 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 217 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2021-11-23 02:15:55,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027481092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:55,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11908307] [2021-11-23 02:15:55,511 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:55,511 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:55,512 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:610) 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) [2021-11-23 02:15:55,513 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:55,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2021-11-23 02:15:55,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821581298] [2021-11-23 02:15:55,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:55,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-23 02:15:55,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:55,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-23 02:15:55,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 02:15:55,518 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) [2021-11-23 02:16:12,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:12,968 INFO L93 Difference]: Finished difference Result 70704 states and 137719 transitions. [2021-11-23 02:16:12,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2021-11-23 02:16:12,980 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 [2021-11-23 02:16:12,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:13,603 INFO L225 Difference]: With dead ends: 70704 [2021-11-23 02:16:13,603 INFO L226 Difference]: Without dead ends: 69682 [2021-11-23 02:16:13,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69795 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=25690, Invalid=135512, Unknown=0, NotChecked=0, Total=161202 [2021-11-23 02:16:13,719 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 473 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 2107 mSolverCounterSat, 3980 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 473 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 6087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3980 IncrementalHoareTripleChecker+Valid, 2107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:13,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [473 Valid, 320 Invalid, 6087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3980 Valid, 2107 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 02:16:13,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69682 states. [2021-11-23 02:16:18,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69682 to 17261. [2021-11-23 02:16:18,263 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) [2021-11-23 02:16:18,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17261 states to 17261 states and 28564 transitions. [2021-11-23 02:16:18,389 INFO L78 Accepts]: Start accepts. Automaton has 17261 states and 28564 transitions. Word has length 127 [2021-11-23 02:16:18,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:18,390 INFO L470 AbstractCegarLoop]: Abstraction has 17261 states and 28564 transitions. [2021-11-23 02:16:18,390 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) [2021-11-23 02:16:18,390 INFO L276 IsEmpty]: Start isEmpty. Operand 17261 states and 28564 transitions. [2021-11-23 02:16:18,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-23 02:16:18,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:18,427 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-23 02:16:18,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:18,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:18,642 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:16:18,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:18,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1011893903, now seen corresponding path program 4 times [2021-11-23 02:16:18,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:18,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895361700] [2021-11-23 02:16:18,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:18,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:18,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:19,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:19,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:19,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895361700] [2021-11-23 02:16:19,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895361700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:16:19,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461010296] [2021-11-23 02:16:19,543 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:16:19,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:19,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:19,544 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:19,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:16:19,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:19,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:16:19,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:20,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:20,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:22,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:22,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461010296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:16:22,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2056334316] [2021-11-23 02:16:22,073 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:16:22,073 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:16:22,074 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:610) 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) [2021-11-23 02:16:22,075 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:16:22,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2021-11-23 02:16:22,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155393415] [2021-11-23 02:16:22,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:16:22,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 02:16:22,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:22,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 02:16:22,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 02:16:22,080 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) [2021-11-23 02:16:27,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:27,879 INFO L93 Difference]: Finished difference Result 28594 states and 45424 transitions. [2021-11-23 02:16:27,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-23 02:16:27,880 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 [2021-11-23 02:16:27,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:28,059 INFO L225 Difference]: With dead ends: 28594 [2021-11-23 02:16:28,059 INFO L226 Difference]: Without dead ends: 28593 [2021-11-23 02:16:28,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8376 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=10814, Invalid=23968, Unknown=0, NotChecked=0, Total=34782 [2021-11-23 02:16:28,083 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 2454 mSDsluCounter, 1299 mSDsCounter, 0 mSdLazyCounter, 2019 mSolverCounterSat, 1289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2458 SdHoareTripleChecker+Valid, 1402 SdHoareTripleChecker+Invalid, 3308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1289 IncrementalHoareTripleChecker+Valid, 2019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:28,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2458 Valid, 1402 Invalid, 3308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1289 Valid, 2019 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 02:16:28,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28593 states. [2021-11-23 02:16:30,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28593 to 27869. [2021-11-23 02:16:30,289 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) [2021-11-23 02:16:30,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27869 states to 27869 states and 44668 transitions. [2021-11-23 02:16:30,444 INFO L78 Accepts]: Start accepts. Automaton has 27869 states and 44668 transitions. Word has length 187 [2021-11-23 02:16:30,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:30,445 INFO L470 AbstractCegarLoop]: Abstraction has 27869 states and 44668 transitions. [2021-11-23 02:16:30,445 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) [2021-11-23 02:16:30,446 INFO L276 IsEmpty]: Start isEmpty. Operand 27869 states and 44668 transitions. [2021-11-23 02:16:30,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-23 02:16:30,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:30,510 INFO L514 BasicCegarLoop]: trace histogram [31, 22, 21, 18, 18, 18, 17, 17, 17, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:16:30,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:30,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 02:16:30,738 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-23 02:16:30,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:30,739 INFO L85 PathProgramCache]: Analyzing trace with hash 179926129, now seen corresponding path program 1 times [2021-11-23 02:16:30,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:30,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458321410] [2021-11-23 02:16:30,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:30,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:30,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:31,290 INFO L134 CoverageAnalysis]: Checked inductivity of 2508 backedges. 527 proven. 278 refuted. 0 times theorem prover too weak. 1703 trivial. 0 not checked. [2021-11-23 02:16:31,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:31,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458321410] [2021-11-23 02:16:31,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458321410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:16:31,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102132417] [2021-11-23 02:16:31,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:31,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:31,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:31,292 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:31,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2630011d-097a-4c97-b324-ce3a06e507dc/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:16:31,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:31,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:16:31,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:32,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2508 backedges. 940 proven. 324 refuted. 0 times theorem prover too weak. 1244 trivial. 0 not checked. [2021-11-23 02:16:32,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:35,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2508 backedges. 963 proven. 436 refuted. 0 times theorem prover too weak. 1109 trivial. 0 not checked. [2021-11-23 02:16:35,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102132417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:16:35,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176345571] [2021-11-23 02:16:35,997 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:16:35,998 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:16:35,998 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:610) 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) [2021-11-23 02:16:36,001 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:16:36,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2021-11-23 02:16:36,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498799238] [2021-11-23 02:16:36,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:16:36,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 02:16:36,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:36,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 02:16:36,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:16:36,005 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) [2021-11-23 02:17:11,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:11,538 INFO L93 Difference]: Finished difference Result 207634 states and 800017 transitions. [2021-11-23 02:17:11,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 375 states. [2021-11-23 02:17:11,539 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 278 [2021-11-23 02:17:11,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:15,717 INFO L225 Difference]: With dead ends: 207634 [2021-11-23 02:17:15,717 INFO L226 Difference]: Without dead ends: 185477 [2021-11-23 02:17:16,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 969 GetRequests, 546 SyntacticMatches, 3 SemanticMatches, 420 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73659 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=24328, Invalid=153334, Unknown=0, NotChecked=0, Total=177662 [2021-11-23 02:17:16,655 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 579 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 8632 mSolverCounterSat, 3677 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 12309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3677 IncrementalHoareTripleChecker+Valid, 8632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:16,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 507 Invalid, 12309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3677 Valid, 8632 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 02:17:16,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185477 states.