./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF --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 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:19:19,525 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:19:19,528 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:19:19,562 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:19:19,563 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:19:19,564 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:19:19,566 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:19:19,568 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:19:19,570 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:19:19,571 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:19:19,572 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:19:19,573 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:19:19,574 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:19:19,575 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:19:19,576 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:19:19,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:19:19,582 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:19:19,587 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:19:19,589 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:19:19,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:19:19,605 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:19:19,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:19:19,608 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:19:19,610 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:19:19,618 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:19:19,619 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:19:19,619 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:19:19,620 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:19:19,622 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:19:19,623 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:19:19,625 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:19:19,626 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:19:19,627 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:19:19,628 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:19:19,629 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:19:19,630 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:19:19,631 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:19:19,632 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:19:19,632 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:19:19,633 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:19:19,633 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:19:19,634 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-12 23:19:19,679 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:19:19,680 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:19:19,681 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:19:19,681 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:19:19,681 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:19:19,682 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:19:19,682 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:19:19,682 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:19:19,682 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:19:19,682 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:19:19,683 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:19:19,684 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:19:19,684 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:19:19,684 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:19:19,684 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:19:19,685 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:19:19,685 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:19:19,686 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:19:19,686 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-12 23:19:19,686 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:19:19,686 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:19:19,687 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:19:19,687 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:19:19,687 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:19:19,687 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:19:19,687 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-12 23:19:19,688 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:19:19,688 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:19:19,688 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:19:19,690 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:19:19,690 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:19:19,690 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:19:19,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:19:19,691 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:19:19,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:19:19,691 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:19:19,691 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:19:19,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:19:19,692 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:19:19,692 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:19:19,692 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:19:19,692 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_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 [2021-11-12 23:19:19,968 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:19:20,005 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:19:20,008 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:19:20,009 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:19:20,010 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:19:20,012 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Ackermann04.c [2021-11-12 23:19:20,068 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/data/19744c48d/f4d8442669964b4a885b373fe9739e19/FLAG251b5c06a [2021-11-12 23:19:20,467 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:19:20,467 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/sv-benchmarks/c/recursive/Ackermann04.c [2021-11-12 23:19:20,474 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/data/19744c48d/f4d8442669964b4a885b373fe9739e19/FLAG251b5c06a [2021-11-12 23:19:20,877 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/data/19744c48d/f4d8442669964b4a885b373fe9739e19 [2021-11-12 23:19:20,880 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:19:20,881 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:19:20,884 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:19:20,884 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:19:20,887 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:19:20,888 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:19:20" (1/1) ... [2021-11-12 23:19:20,889 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f8aaf97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:20, skipping insertion in model container [2021-11-12 23:19:20,889 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:19:20" (1/1) ... [2021-11-12 23:19:20,896 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:19:20,909 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:19:21,077 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/sv-benchmarks/c/recursive/Ackermann04.c[1166,1179] [2021-11-12 23:19:21,078 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:19:21,086 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:19:21,103 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/sv-benchmarks/c/recursive/Ackermann04.c[1166,1179] [2021-11-12 23:19:21,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:19:21,122 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:19:21,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21 WrapperNode [2021-11-12 23:19:21,123 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:19:21,124 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:19:21,124 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:19:21,124 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:19:21,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,141 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,162 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:19:21,164 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:19:21,164 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:19:21,164 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:19:21,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,192 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,193 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,195 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:19:21,196 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:19:21,196 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:19:21,196 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:19:21,200 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (1/1) ... [2021-11-12 23:19:21,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:19:21,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:21,229 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:19:21,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:19:21,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:19:21,273 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:19:21,274 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-12 23:19:21,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-12 23:19:21,274 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:19:21,274 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:19:21,534 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:19:21,534 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 23:19:21,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:19:21 BoogieIcfgContainer [2021-11-12 23:19:21,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:19:21,553 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:19:21,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:19:21,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:19:21,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:19:20" (1/3) ... [2021-11-12 23:19:21,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21b2d68d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:19:21, skipping insertion in model container [2021-11-12 23:19:21,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:19:21" (2/3) ... [2021-11-12 23:19:21,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21b2d68d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:19:21, skipping insertion in model container [2021-11-12 23:19:21,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:19:21" (3/3) ... [2021-11-12 23:19:21,568 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann04.c [2021-11-12 23:19:21,573 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:19:21,588 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2021-11-12 23:19:21,675 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:19:21,687 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 23:19:21,687 INFO L340 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-11-12 23:19:21,713 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) [2021-11-12 23:19:21,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-12 23:19:21,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:21,727 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:21,729 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:21,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:21,741 INFO L85 PathProgramCache]: Analyzing trace with hash 401720455, now seen corresponding path program 1 times [2021-11-12 23:19:21,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:21,752 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863668487] [2021-11-12 23:19:21,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:21,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:21,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:22,032 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:22,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:22,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863668487] [2021-11-12 23:19:22,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863668487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:22,038 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:22,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:19:22,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305010285] [2021-11-12 23:19:22,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:22,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:19:22,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:22,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:19:22,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:19:22,085 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) [2021-11-12 23:19:22,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:22,302 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2021-11-12 23:19:22,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:19:22,305 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 [2021-11-12 23:19:22,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:22,314 INFO L225 Difference]: With dead ends: 65 [2021-11-12 23:19:22,315 INFO L226 Difference]: Without dead ends: 58 [2021-11-12 23:19:22,318 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 [2021-11-12 23:19:22,321 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 52 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 126.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.35ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 147.44ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:22,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 101 Invalid, 74 Unknown, 0 Unchecked, 9.35ms Time], IncrementalHoareTripleChecker [13 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 147.44ms Time] [2021-11-12 23:19:22,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-12 23:19:22,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-11-12 23:19:22,378 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) [2021-11-12 23:19:22,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-11-12 23:19:22,392 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2021-11-12 23:19:22,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:22,393 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-11-12 23:19:22,393 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) [2021-11-12 23:19:22,393 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-11-12 23:19:22,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-12 23:19:22,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:22,394 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:22,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:19:22,396 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:22,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:22,401 INFO L85 PathProgramCache]: Analyzing trace with hash -431562724, now seen corresponding path program 1 times [2021-11-12 23:19:22,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:22,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463478628] [2021-11-12 23:19:22,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:22,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:22,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:22,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:22,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:22,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463478628] [2021-11-12 23:19:22,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463478628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:22,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:22,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:19:22,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259980938] [2021-11-12 23:19:22,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:22,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:19:22,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:22,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:19:22,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:19:22,479 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) [2021-11-12 23:19:22,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:22,532 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2021-11-12 23:19:22,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:19:22,533 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 [2021-11-12 23:19:22,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:22,534 INFO L225 Difference]: With dead ends: 50 [2021-11-12 23:19:22,534 INFO L226 Difference]: Without dead ends: 48 [2021-11-12 23:19:22,535 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 [2021-11-12 23:19:22,537 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.71ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.36ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:22,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 1.71ms Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 35.36ms Time] [2021-11-12 23:19:22,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-12 23:19:22,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-12 23:19:22,546 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) [2021-11-12 23:19:22,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-12 23:19:22,548 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 8 [2021-11-12 23:19:22,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:22,549 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-12 23:19:22,549 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) [2021-11-12 23:19:22,549 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-12 23:19:22,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-12 23:19:22,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:22,550 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:22,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 23:19:22,551 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:22,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:22,551 INFO L85 PathProgramCache]: Analyzing trace with hash -431567721, now seen corresponding path program 1 times [2021-11-12 23:19:22,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:22,552 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905286314] [2021-11-12 23:19:22,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:22,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:22,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:22,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:22,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:22,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905286314] [2021-11-12 23:19:22,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905286314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:22,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:22,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:19:22,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898635867] [2021-11-12 23:19:22,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:22,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:19:22,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:22,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:19:22,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:19:22,601 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) [2021-11-12 23:19:22,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:22,668 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2021-11-12 23:19:22,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:19:22,668 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 [2021-11-12 23:19:22,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:22,670 INFO L225 Difference]: With dead ends: 75 [2021-11-12 23:19:22,670 INFO L226 Difference]: Without dead ends: 73 [2021-11-12 23:19:22,671 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 [2021-11-12 23:19:22,672 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 39 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.88ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.59ms SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 44.97ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:22,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 97 Invalid, 53 Unknown, 0 Unchecked, 2.59ms Time], IncrementalHoareTripleChecker [12 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 44.97ms Time] [2021-11-12 23:19:22,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-12 23:19:22,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-11-12 23:19:22,686 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) [2021-11-12 23:19:22,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2021-11-12 23:19:22,698 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 8 [2021-11-12 23:19:22,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:22,699 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2021-11-12 23:19:22,699 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) [2021-11-12 23:19:22,699 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2021-11-12 23:19:22,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-12 23:19:22,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:22,700 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:22,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-12 23:19:22,701 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:22,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:22,701 INFO L85 PathProgramCache]: Analyzing trace with hash -493542486, now seen corresponding path program 1 times [2021-11-12 23:19:22,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:22,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365704576] [2021-11-12 23:19:22,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:22,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:22,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:22,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:22,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:22,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365704576] [2021-11-12 23:19:22,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365704576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:22,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:22,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:19:22,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686849750] [2021-11-12 23:19:22,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:22,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:19:22,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:22,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:19:22,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:19:22,781 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) [2021-11-12 23:19:22,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:22,899 INFO L93 Difference]: Finished difference Result 115 states and 153 transitions. [2021-11-12 23:19:22,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:19:22,899 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 [2021-11-12 23:19:22,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:22,902 INFO L225 Difference]: With dead ends: 115 [2021-11-12 23:19:22,902 INFO L226 Difference]: Without dead ends: 107 [2021-11-12 23:19:22,903 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 [2021-11-12 23:19:22,904 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 39 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 47.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.58ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 66.62ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:22,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 96 Invalid, 51 Unknown, 0 Unchecked, 4.58ms Time], IncrementalHoareTripleChecker [13 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 66.62ms Time] [2021-11-12 23:19:22,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-12 23:19:22,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 99. [2021-11-12 23:19:22,925 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) [2021-11-12 23:19:22,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2021-11-12 23:19:22,928 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2021-11-12 23:19:22,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:22,928 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2021-11-12 23:19:22,928 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) [2021-11-12 23:19:22,929 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2021-11-12 23:19:22,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-12 23:19:22,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:22,930 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:22,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-12 23:19:22,930 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:22,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:22,931 INFO L85 PathProgramCache]: Analyzing trace with hash 349584333, now seen corresponding path program 1 times [2021-11-12 23:19:22,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:22,931 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456084716] [2021-11-12 23:19:22,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:22,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:22,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:22,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:22,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:22,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456084716] [2021-11-12 23:19:22,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456084716] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:22,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:22,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:19:22,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401046704] [2021-11-12 23:19:22,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:22,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:19:22,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:22,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:19:22,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:19:22,988 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) [2021-11-12 23:19:23,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:23,061 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2021-11-12 23:19:23,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:19:23,062 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 [2021-11-12 23:19:23,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:23,065 INFO L225 Difference]: With dead ends: 167 [2021-11-12 23:19:23,068 INFO L226 Difference]: Without dead ends: 96 [2021-11-12 23:19:23,071 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 [2021-11-12 23:19:23,075 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.87ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.53ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:23,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 83 Invalid, 35 Unknown, 0 Unchecked, 1.87ms Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 37.53ms Time] [2021-11-12 23:19:23,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-12 23:19:23,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-11-12 23:19:23,098 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) [2021-11-12 23:19:23,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2021-11-12 23:19:23,108 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 15 [2021-11-12 23:19:23,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:23,109 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2021-11-12 23:19:23,110 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) [2021-11-12 23:19:23,111 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2021-11-12 23:19:23,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-12 23:19:23,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:23,112 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:23,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-12 23:19:23,118 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:23,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:23,119 INFO L85 PathProgramCache]: Analyzing trace with hash 349591284, now seen corresponding path program 1 times [2021-11-12 23:19:23,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:23,120 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802952224] [2021-11-12 23:19:23,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:23,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:23,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:23,224 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:23,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:23,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802952224] [2021-11-12 23:19:23,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802952224] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:23,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870330318] [2021-11-12 23:19:23,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:23,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:23,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:23,228 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:23,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:19:23,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:23,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:19:23,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:23,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:23,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:23,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870330318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:23,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206226040] [2021-11-12 23:19:23,522 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-12 23:19:23,522 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:23,527 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) [2021-11-12 23:19:23,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:23,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-12 23:19:23,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446789230] [2021-11-12 23:19:23,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:23,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 23:19:23,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:23,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 23:19:23,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:19:23,533 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) [2021-11-12 23:19:23,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:23,797 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2021-11-12 23:19:23,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 23:19:23,797 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 [2021-11-12 23:19:23,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:23,807 INFO L225 Difference]: With dead ends: 273 [2021-11-12 23:19:23,807 INFO L226 Difference]: Without dead ends: 271 [2021-11-12 23:19:23,808 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 [2021-11-12 23:19:23,816 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 302 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 139.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.68ms SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 170.05ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:23,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 166 Invalid, 255 Unknown, 0 Unchecked, 4.68ms Time], IncrementalHoareTripleChecker [114 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 170.05ms Time] [2021-11-12 23:19:23,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-12 23:19:23,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2021-11-12 23:19:23,882 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) [2021-11-12 23:19:23,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2021-11-12 23:19:23,889 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 15 [2021-11-12 23:19:23,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:23,889 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2021-11-12 23:19:23,889 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) [2021-11-12 23:19:23,889 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2021-11-12 23:19:23,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-12 23:19:23,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:23,896 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:23,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-12 23:19:24,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:24,097 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:24,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:24,098 INFO L85 PathProgramCache]: Analyzing trace with hash 903853037, now seen corresponding path program 1 times [2021-11-12 23:19:24,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:24,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379923970] [2021-11-12 23:19:24,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:24,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:24,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:24,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:24,164 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:24,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379923970] [2021-11-12 23:19:24,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379923970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:24,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400004267] [2021-11-12 23:19:24,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:24,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:24,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:24,180 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:24,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:19:24,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:24,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:19:24,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:24,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:24,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:24,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:24,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400004267] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:24,381 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:19:24,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [6] total 11 [2021-11-12 23:19:24,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329127064] [2021-11-12 23:19:24,381 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:24,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:19:24,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:24,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:19:24,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:19:24,383 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:19:24,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:24,498 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2021-11-12 23:19:24,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:19:24,499 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-12 23:19:24,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:24,505 INFO L225 Difference]: With dead ends: 327 [2021-11-12 23:19:24,505 INFO L226 Difference]: Without dead ends: 326 [2021-11-12 23:19:24,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:19:24,508 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 50 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.95ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 63.67ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:24,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 123 Invalid, 85 Unknown, 0 Unchecked, 1.95ms Time], IncrementalHoareTripleChecker [21 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 63.67ms Time] [2021-11-12 23:19:24,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-12 23:19:24,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2021-11-12 23:19:24,557 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) [2021-11-12 23:19:24,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2021-11-12 23:19:24,563 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 16 [2021-11-12 23:19:24,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:24,564 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2021-11-12 23:19:24,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:19:24,564 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2021-11-12 23:19:24,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 23:19:24,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:24,569 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:24,600 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-12 23:19:24,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:24,796 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:24,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:24,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1691461981, now seen corresponding path program 1 times [2021-11-12 23:19:24,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:24,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446615847] [2021-11-12 23:19:24,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:24,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:24,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:24,858 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:24,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:24,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446615847] [2021-11-12 23:19:24,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446615847] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:24,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685581281] [2021-11-12 23:19:24,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:24,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:24,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:24,860 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:24,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:19:24,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:24,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:19:24,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:24,955 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:24,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:25,045 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:25,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685581281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:25,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872057127] [2021-11-12 23:19:25,049 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-12 23:19:25,049 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:25,050 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) [2021-11-12 23:19:25,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:25,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2021-11-12 23:19:25,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102904366] [2021-11-12 23:19:25,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:25,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 23:19:25,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:25,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 23:19:25,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:19:25,055 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) [2021-11-12 23:19:25,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:25,305 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2021-11-12 23:19:25,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 23:19:25,305 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 [2021-11-12 23:19:25,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:25,311 INFO L225 Difference]: With dead ends: 590 [2021-11-12 23:19:25,312 INFO L226 Difference]: Without dead ends: 589 [2021-11-12 23:19:25,312 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 [2021-11-12 23:19:25,313 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 201 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 107.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.50ms SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 139.68ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:25,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 167 Invalid, 222 Unknown, 0 Unchecked, 5.50ms Time], IncrementalHoareTripleChecker [75 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 139.68ms Time] [2021-11-12 23:19:25,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-12 23:19:25,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2021-11-12 23:19:25,361 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) [2021-11-12 23:19:25,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2021-11-12 23:19:25,367 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 19 [2021-11-12 23:19:25,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:25,368 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2021-11-12 23:19:25,368 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) [2021-11-12 23:19:25,368 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2021-11-12 23:19:25,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-12 23:19:25,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:25,375 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] [2021-11-12 23:19:25,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:25,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-12 23:19:25,596 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:25,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:25,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1177154428, now seen corresponding path program 1 times [2021-11-12 23:19:25,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:25,597 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524902401] [2021-11-12 23:19:25,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:25,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:25,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:25,693 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:25,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:25,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524902401] [2021-11-12 23:19:25,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524902401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:25,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59223573] [2021-11-12 23:19:25,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:25,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:25,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:25,700 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:25,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:19:25,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:25,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:19:25,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:25,819 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:25,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:26,016 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:26,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59223573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:26,017 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14002480] [2021-11-12 23:19:26,020 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:19:26,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:26,020 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) [2021-11-12 23:19:26,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:26,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-12 23:19:26,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934201666] [2021-11-12 23:19:26,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:26,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-12 23:19:26,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:26,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-12 23:19:26,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:19:26,024 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) [2021-11-12 23:19:26,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:26,269 INFO L93 Difference]: Finished difference Result 824 states and 1154 transitions. [2021-11-12 23:19:26,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-12 23:19:26,270 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 [2021-11-12 23:19:26,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:26,277 INFO L225 Difference]: With dead ends: 824 [2021-11-12 23:19:26,277 INFO L226 Difference]: Without dead ends: 822 [2021-11-12 23:19:26,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:19:26,279 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 177 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 102.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.00ms SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 124.69ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:26,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 93 Invalid, 251 Unknown, 0 Unchecked, 3.00ms Time], IncrementalHoareTripleChecker [81 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 124.69ms Time] [2021-11-12 23:19:26,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-11-12 23:19:26,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 747. [2021-11-12 23:19:26,337 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) [2021-11-12 23:19:26,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 952 transitions. [2021-11-12 23:19:26,347 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 952 transitions. Word has length 23 [2021-11-12 23:19:26,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:26,347 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 952 transitions. [2021-11-12 23:19:26,347 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) [2021-11-12 23:19:26,347 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 952 transitions. [2021-11-12 23:19:26,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-12 23:19:26,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:26,349 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] [2021-11-12 23:19:26,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:26,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-12 23:19:26,564 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:26,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:26,565 INFO L85 PathProgramCache]: Analyzing trace with hash 2132048962, now seen corresponding path program 1 times [2021-11-12 23:19:26,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:26,565 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622700882] [2021-11-12 23:19:26,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:26,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:26,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:26,659 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:26,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:26,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622700882] [2021-11-12 23:19:26,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622700882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:26,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356712796] [2021-11-12 23:19:26,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:26,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:26,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:26,661 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:26,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:19:26,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:26,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:19:26,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:26,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:26,842 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 23:19:26,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356712796] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:26,843 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:19:26,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7] total 13 [2021-11-12 23:19:26,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478350218] [2021-11-12 23:19:26,844 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:26,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:19:26,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:26,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:19:26,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:19:26,845 INFO L87 Difference]: Start difference. First operand 747 states and 952 transitions. Second operand has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:19:27,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:27,059 INFO L93 Difference]: Finished difference Result 756 states and 962 transitions. [2021-11-12 23:19:27,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 23:19:27,059 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-11-12 23:19:27,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:27,065 INFO L225 Difference]: With dead ends: 756 [2021-11-12 23:19:27,066 INFO L226 Difference]: Without dead ends: 755 [2021-11-12 23:19:27,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:19:27,067 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 89 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.07ms SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 87.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:27,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 143 Invalid, 141 Unknown, 0 Unchecked, 2.07ms Time], IncrementalHoareTripleChecker [29 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 87.63ms Time] [2021-11-12 23:19:27,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-12 23:19:27,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 746. [2021-11-12 23:19:27,119 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) [2021-11-12 23:19:27,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2021-11-12 23:19:27,128 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2021-11-12 23:19:27,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:27,128 INFO L470 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2021-11-12 23:19:27,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 5 states have (on average 4.8) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:19:27,129 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2021-11-12 23:19:27,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-12 23:19:27,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:27,130 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] [2021-11-12 23:19:27,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:27,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-12 23:19:27,344 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:27,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:27,344 INFO L85 PathProgramCache]: Analyzing trace with hash 2049869032, now seen corresponding path program 1 times [2021-11-12 23:19:27,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:27,344 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474603190] [2021-11-12 23:19:27,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:27,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:27,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:27,402 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 23:19:27,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:27,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474603190] [2021-11-12 23:19:27,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474603190] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:27,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319474389] [2021-11-12 23:19:27,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:27,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:27,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:27,410 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:27,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:19:27,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:27,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 23:19:27,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:27,539 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:19:27,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:19:27,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319474389] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:27,678 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:19:27,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2021-11-12 23:19:27,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061763304] [2021-11-12 23:19:27,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:27,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:19:27,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:27,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:19:27,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-12 23:19:27,680 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) [2021-11-12 23:19:27,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:27,885 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2021-11-12 23:19:27,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 23:19:27,885 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 [2021-11-12 23:19:27,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:27,893 INFO L225 Difference]: With dead ends: 901 [2021-11-12 23:19:27,893 INFO L226 Difference]: Without dead ends: 900 [2021-11-12 23:19:27,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:19:27,895 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 71 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.12ms SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 98.52ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:27,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 101 Invalid, 168 Unknown, 0 Unchecked, 2.12ms Time], IncrementalHoareTripleChecker [42 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 98.52ms Time] [2021-11-12 23:19:27,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-12 23:19:27,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2021-11-12 23:19:27,972 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) [2021-11-12 23:19:27,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2021-11-12 23:19:27,982 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 27 [2021-11-12 23:19:27,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:27,982 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2021-11-12 23:19:27,983 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) [2021-11-12 23:19:27,983 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2021-11-12 23:19:27,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-12 23:19:27,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:27,984 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] [2021-11-12 23:19:28,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:28,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:28,212 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:28,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:28,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1228982289, now seen corresponding path program 1 times [2021-11-12 23:19:28,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:28,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997892478] [2021-11-12 23:19:28,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:28,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:28,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:28,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:28,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997892478] [2021-11-12 23:19:28,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997892478] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:28,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931909747] [2021-11-12 23:19:28,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:28,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:28,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:28,316 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:28,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:19:28,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:28,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:19:28,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:28,460 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:28,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:28,697 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:28,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931909747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:28,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [329900773] [2021-11-12 23:19:28,700 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-12 23:19:28,700 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:28,701 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) [2021-11-12 23:19:28,701 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:28,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-12 23:19:28,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955763507] [2021-11-12 23:19:28,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:28,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-12 23:19:28,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:28,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-12 23:19:28,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:19:28,703 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) [2021-11-12 23:19:29,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:29,296 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2021-11-12 23:19:29,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-12 23:19:29,296 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 [2021-11-12 23:19:29,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:29,312 INFO L225 Difference]: With dead ends: 1544 [2021-11-12 23:19:29,312 INFO L226 Difference]: Without dead ends: 1542 [2021-11-12 23:19:29,315 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 [2021-11-12 23:19:29,315 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 126 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 182.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.36ms SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 221.86ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:29,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 126 Invalid, 388 Unknown, 0 Unchecked, 3.36ms Time], IncrementalHoareTripleChecker [131 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 221.86ms Time] [2021-11-12 23:19:29,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2021-11-12 23:19:29,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2021-11-12 23:19:29,427 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) [2021-11-12 23:19:29,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2021-11-12 23:19:29,441 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 32 [2021-11-12 23:19:29,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:29,442 INFO L470 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2021-11-12 23:19:29,442 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) [2021-11-12 23:19:29,442 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2021-11-12 23:19:29,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 23:19:29,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:29,444 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] [2021-11-12 23:19:29,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:29,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:29,668 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:29,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:29,669 INFO L85 PathProgramCache]: Analyzing trace with hash -845541166, now seen corresponding path program 2 times [2021-11-12 23:19:29,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:29,669 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56543734] [2021-11-12 23:19:29,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:29,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:29,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:29,748 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 23:19:29,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:29,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56543734] [2021-11-12 23:19:29,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56543734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:29,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740077880] [2021-11-12 23:19:29,749 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:19:29,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:29,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:29,752 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:29,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:19:29,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-12 23:19:29,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:19:29,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 23:19:29,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:29,889 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 23:19:29,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:30,098 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 23:19:30,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740077880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:30,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1854061991] [2021-11-12 23:19:30,103 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:19:30,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:30,104 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) [2021-11-12 23:19:30,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:30,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-12 23:19:30,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094217694] [2021-11-12 23:19:30,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:30,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-12 23:19:30,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:30,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-12 23:19:30,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:19:30,107 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) [2021-11-12 23:19:30,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:30,799 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2021-11-12 23:19:30,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-12 23:19:30,800 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 [2021-11-12 23:19:30,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:30,818 INFO L225 Difference]: With dead ends: 2153 [2021-11-12 23:19:30,819 INFO L226 Difference]: Without dead ends: 2119 [2021-11-12 23:19:30,821 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 [2021-11-12 23:19:30,822 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 343 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 273.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.90ms SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 329.24ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:30,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 162 Invalid, 618 Unknown, 0 Unchecked, 4.90ms Time], IncrementalHoareTripleChecker [204 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 329.24ms Time] [2021-11-12 23:19:30,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-11-12 23:19:30,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1968. [2021-11-12 23:19:30,983 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) [2021-11-12 23:19:31,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1968 states to 1968 states and 2844 transitions. [2021-11-12 23:19:31,003 INFO L78 Accepts]: Start accepts. Automaton has 1968 states and 2844 transitions. Word has length 35 [2021-11-12 23:19:31,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:31,003 INFO L470 AbstractCegarLoop]: Abstraction has 1968 states and 2844 transitions. [2021-11-12 23:19:31,003 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) [2021-11-12 23:19:31,004 INFO L276 IsEmpty]: Start isEmpty. Operand 1968 states and 2844 transitions. [2021-11-12 23:19:31,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-12 23:19:31,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:31,005 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] [2021-11-12 23:19:31,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:31,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-12 23:19:31,220 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:31,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:31,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1557551067, now seen corresponding path program 1 times [2021-11-12 23:19:31,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:31,221 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031880722] [2021-11-12 23:19:31,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:31,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:31,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:31,317 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:31,317 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:31,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031880722] [2021-11-12 23:19:31,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031880722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:31,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674343137] [2021-11-12 23:19:31,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:31,318 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:31,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:31,319 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:31,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:19:31,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:31,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:19:31,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:31,453 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:31,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:31,694 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:31,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674343137] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:31,695 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:19:31,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2021-11-12 23:19:31,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433337015] [2021-11-12 23:19:31,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:31,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 23:19:31,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:31,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 23:19:31,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:19:31,696 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) [2021-11-12 23:19:32,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:32,042 INFO L93 Difference]: Finished difference Result 2200 states and 3487 transitions. [2021-11-12 23:19:32,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-12 23:19:32,043 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 [2021-11-12 23:19:32,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:32,062 INFO L225 Difference]: With dead ends: 2200 [2021-11-12 23:19:32,062 INFO L226 Difference]: Without dead ends: 2199 [2021-11-12 23:19:32,064 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 [2021-11-12 23:19:32,065 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 60 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 139.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.71ms SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 162.25ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:32,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 176 Invalid, 242 Unknown, 0 Unchecked, 2.71ms Time], IncrementalHoareTripleChecker [48 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 162.25ms Time] [2021-11-12 23:19:32,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-11-12 23:19:32,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 1976. [2021-11-12 23:19:32,236 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) [2021-11-12 23:19:32,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1976 states to 1976 states and 2707 transitions. [2021-11-12 23:19:32,251 INFO L78 Accepts]: Start accepts. Automaton has 1976 states and 2707 transitions. Word has length 36 [2021-11-12 23:19:32,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:32,252 INFO L470 AbstractCegarLoop]: Abstraction has 1976 states and 2707 transitions. [2021-11-12 23:19:32,252 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) [2021-11-12 23:19:32,253 INFO L276 IsEmpty]: Start isEmpty. Operand 1976 states and 2707 transitions. [2021-11-12 23:19:32,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-12 23:19:32,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:32,255 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] [2021-11-12 23:19:32,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:32,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-12 23:19:32,476 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:32,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:32,477 INFO L85 PathProgramCache]: Analyzing trace with hash 791969396, now seen corresponding path program 1 times [2021-11-12 23:19:32,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:32,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992080645] [2021-11-12 23:19:32,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:32,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:32,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:32,526 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 23:19:32,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:32,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992080645] [2021-11-12 23:19:32,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992080645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:32,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493028499] [2021-11-12 23:19:32,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:32,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:32,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:32,529 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:32,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 23:19:32,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:32,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:19:32,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:32,675 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 23:19:32,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:32,870 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 23:19:32,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493028499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:32,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214632993] [2021-11-12 23:19:32,873 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-12 23:19:32,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:32,873 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) [2021-11-12 23:19:32,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:32,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-12 23:19:32,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519321052] [2021-11-12 23:19:32,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:32,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 23:19:32,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:32,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 23:19:32,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:19:32,875 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) [2021-11-12 23:19:33,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:33,083 INFO L93 Difference]: Finished difference Result 3068 states and 4537 transitions. [2021-11-12 23:19:33,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:19:33,084 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 [2021-11-12 23:19:33,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:33,097 INFO L225 Difference]: With dead ends: 3068 [2021-11-12 23:19:33,098 INFO L226 Difference]: Without dead ends: 1692 [2021-11-12 23:19:33,112 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 [2021-11-12 23:19:33,112 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 107 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.24ms SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 73.79ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:33,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 73 Invalid, 130 Unknown, 0 Unchecked, 1.24ms Time], IncrementalHoareTripleChecker [38 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 73.79ms Time] [2021-11-12 23:19:33,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2021-11-12 23:19:33,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1218. [2021-11-12 23:19:33,211 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) [2021-11-12 23:19:33,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1568 transitions. [2021-11-12 23:19:33,218 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1568 transitions. Word has length 42 [2021-11-12 23:19:33,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:33,219 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1568 transitions. [2021-11-12 23:19:33,219 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) [2021-11-12 23:19:33,219 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1568 transitions. [2021-11-12 23:19:33,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-12 23:19:33,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:33,221 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-12 23:19:33,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:33,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-12 23:19:33,436 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:33,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:33,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1872551963, now seen corresponding path program 2 times [2021-11-12 23:19:33,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:33,437 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864386020] [2021-11-12 23:19:33,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:33,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:33,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:33,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:33,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864386020] [2021-11-12 23:19:33,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864386020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:33,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824883795] [2021-11-12 23:19:33,540 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:19:33,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:33,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:33,541 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:33,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 23:19:33,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 23:19:33,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:19:33,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 23:19:33,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:33,688 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:33,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:33,902 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:19:33,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824883795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:33,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82041954] [2021-11-12 23:19:33,903 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-12 23:19:33,903 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:33,904 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) [2021-11-12 23:19:33,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:33,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2021-11-12 23:19:33,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108916908] [2021-11-12 23:19:33,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:33,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 23:19:33,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:33,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 23:19:33,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2021-11-12 23:19:33,908 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) [2021-11-12 23:19:34,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:34,603 INFO L93 Difference]: Finished difference Result 2184 states and 2971 transitions. [2021-11-12 23:19:34,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-12 23:19:34,603 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 [2021-11-12 23:19:34,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:34,620 INFO L225 Difference]: With dead ends: 2184 [2021-11-12 23:19:34,620 INFO L226 Difference]: Without dead ends: 2183 [2021-11-12 23:19:34,622 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 [2021-11-12 23:19:34,623 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 535 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 274.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.15ms SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 332.18ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:34,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [538 Valid, 336 Invalid, 626 Unknown, 0 Unchecked, 6.15ms Time], IncrementalHoareTripleChecker [141 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 332.18ms Time] [2021-11-12 23:19:34,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2021-11-12 23:19:34,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 1938. [2021-11-12 23:19:34,752 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) [2021-11-12 23:19:34,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2468 transitions. [2021-11-12 23:19:34,762 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2468 transitions. Word has length 43 [2021-11-12 23:19:34,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:34,762 INFO L470 AbstractCegarLoop]: Abstraction has 1938 states and 2468 transitions. [2021-11-12 23:19:34,762 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) [2021-11-12 23:19:34,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2468 transitions. [2021-11-12 23:19:34,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-12 23:19:34,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:34,765 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] [2021-11-12 23:19:34,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:34,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-12 23:19:34,984 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:34,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:34,985 INFO L85 PathProgramCache]: Analyzing trace with hash -112901947, now seen corresponding path program 2 times [2021-11-12 23:19:34,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:34,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100069402] [2021-11-12 23:19:34,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:34,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:34,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:35,087 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:19:35,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:35,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100069402] [2021-11-12 23:19:35,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100069402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:35,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575617373] [2021-11-12 23:19:35,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:19:35,087 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:35,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:35,092 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:35,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 23:19:35,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-12 23:19:35,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:19:35,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 23:19:35,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 23:19:35,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 23:19:35,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575617373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:35,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1630715566] [2021-11-12 23:19:35,801 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-12 23:19:35,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:35,802 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) [2021-11-12 23:19:35,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:35,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 13] total 23 [2021-11-12 23:19:35,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44477355] [2021-11-12 23:19:35,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:35,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-12 23:19:35,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:35,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-12 23:19:35,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-11-12 23:19:35,805 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) [2021-11-12 23:19:36,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:36,840 INFO L93 Difference]: Finished difference Result 3169 states and 4414 transitions. [2021-11-12 23:19:36,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-12 23:19:36,841 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 [2021-11-12 23:19:36,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:36,852 INFO L225 Difference]: With dead ends: 3169 [2021-11-12 23:19:36,853 INFO L226 Difference]: Without dead ends: 1492 [2021-11-12 23:19:36,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=379, Invalid=1427, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 23:19:36,867 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 213 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 294.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.13ms SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 351.69ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:36,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 100 Invalid, 729 Unknown, 0 Unchecked, 4.13ms Time], IncrementalHoareTripleChecker [173 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 351.69ms Time] [2021-11-12 23:19:36,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-12 23:19:36,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1397. [2021-11-12 23:19:36,985 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) [2021-11-12 23:19:36,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1779 transitions. [2021-11-12 23:19:36,991 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1779 transitions. Word has length 44 [2021-11-12 23:19:36,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:36,991 INFO L470 AbstractCegarLoop]: Abstraction has 1397 states and 1779 transitions. [2021-11-12 23:19:36,991 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) [2021-11-12 23:19:36,992 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1779 transitions. [2021-11-12 23:19:36,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-12 23:19:36,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:36,994 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] [2021-11-12 23:19:37,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:37,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-12 23:19:37,208 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:37,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:37,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1647647435, now seen corresponding path program 1 times [2021-11-12 23:19:37,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:37,209 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921672722] [2021-11-12 23:19:37,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:37,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:37,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:37,352 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:19:37,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:37,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921672722] [2021-11-12 23:19:37,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921672722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:37,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276656429] [2021-11-12 23:19:37,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:37,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:37,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:37,354 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:37,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 23:19:37,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:37,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 23:19:37,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:37,541 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:19:37,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:38,105 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:19:38,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276656429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:38,106 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918330496] [2021-11-12 23:19:38,110 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:19:38,110 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:38,111 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) [2021-11-12 23:19:38,112 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:38,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2021-11-12 23:19:38,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129092816] [2021-11-12 23:19:38,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:38,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-12 23:19:38,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:38,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-12 23:19:38,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-11-12 23:19:38,116 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) [2021-11-12 23:19:40,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:40,424 INFO L93 Difference]: Finished difference Result 4226 states and 7033 transitions. [2021-11-12 23:19:40,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-12 23:19:40,425 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 [2021-11-12 23:19:40,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:40,466 INFO L225 Difference]: With dead ends: 4226 [2021-11-12 23:19:40,466 INFO L226 Difference]: Without dead ends: 4194 [2021-11-12 23:19:40,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2354 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2021-11-12 23:19:40,475 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 187 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 517 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 545.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 1259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.58ms SdHoareTripleChecker+Time, 517 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 690.37ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:40,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 174 Invalid, 1259 Unknown, 0 Unchecked, 6.58ms Time], IncrementalHoareTripleChecker [517 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 690.37ms Time] [2021-11-12 23:19:40,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4194 states. [2021-11-12 23:19:40,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4194 to 3143. [2021-11-12 23:19:40,782 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) [2021-11-12 23:19:40,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3143 states to 3143 states and 5466 transitions. [2021-11-12 23:19:40,800 INFO L78 Accepts]: Start accepts. Automaton has 3143 states and 5466 transitions. Word has length 51 [2021-11-12 23:19:40,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:40,801 INFO L470 AbstractCegarLoop]: Abstraction has 3143 states and 5466 transitions. [2021-11-12 23:19:40,801 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) [2021-11-12 23:19:40,801 INFO L276 IsEmpty]: Start isEmpty. Operand 3143 states and 5466 transitions. [2021-11-12 23:19:40,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-12 23:19:40,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:40,803 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:40,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:41,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-12 23:19:41,028 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:41,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:41,029 INFO L85 PathProgramCache]: Analyzing trace with hash 397022168, now seen corresponding path program 1 times [2021-11-12 23:19:41,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:41,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208863420] [2021-11-12 23:19:41,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:41,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:41,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:41,184 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 54 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-12 23:19:41,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:41,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208863420] [2021-11-12 23:19:41,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208863420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:41,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275591810] [2021-11-12 23:19:41,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:41,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:41,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:41,186 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:41,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 23:19:41,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:41,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 23:19:41,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:41,408 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 46 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-12 23:19:41,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:42,214 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 63 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-12 23:19:42,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275591810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:42,215 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515437880] [2021-11-12 23:19:42,217 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:19:42,217 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:42,218 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) [2021-11-12 23:19:42,219 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:42,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2021-11-12 23:19:42,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917617982] [2021-11-12 23:19:42,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:42,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-12 23:19:42,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:42,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-12 23:19:42,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-11-12 23:19:42,221 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) [2021-11-12 23:19:43,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:43,546 INFO L93 Difference]: Finished difference Result 6291 states and 12447 transitions. [2021-11-12 23:19:43,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-12 23:19:43,547 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.259259259259259) internal successors, (61), 20 states have internal predecessors, (61), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 72 [2021-11-12 23:19:43,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:43,580 INFO L225 Difference]: With dead ends: 6291 [2021-11-12 23:19:43,580 INFO L226 Difference]: Without dead ends: 3586 [2021-11-12 23:19:43,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2021-11-12 23:19:43,624 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 111 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 276.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.10ms SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 328.99ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:43,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 227 Invalid, 772 Unknown, 0 Unchecked, 3.10ms Time], IncrementalHoareTripleChecker [159 Valid, 613 Invalid, 0 Unknown, 0 Unchecked, 328.99ms Time] [2021-11-12 23:19:43,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3586 states. [2021-11-12 23:19:43,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3586 to 3481. [2021-11-12 23:19:43,919 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) [2021-11-12 23:19:43,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3481 states to 3481 states and 5298 transitions. [2021-11-12 23:19:43,946 INFO L78 Accepts]: Start accepts. Automaton has 3481 states and 5298 transitions. Word has length 72 [2021-11-12 23:19:43,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:43,946 INFO L470 AbstractCegarLoop]: Abstraction has 3481 states and 5298 transitions. [2021-11-12 23:19:43,947 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) [2021-11-12 23:19:43,948 INFO L276 IsEmpty]: Start isEmpty. Operand 3481 states and 5298 transitions. [2021-11-12 23:19:43,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-12 23:19:43,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:43,952 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-12 23:19:43,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:44,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:44,165 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:44,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:44,166 INFO L85 PathProgramCache]: Analyzing trace with hash 2052338112, now seen corresponding path program 2 times [2021-11-12 23:19:44,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:44,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504803873] [2021-11-12 23:19:44,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:44,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:44,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:44,225 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 93 proven. 31 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-12 23:19:44,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:44,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504803873] [2021-11-12 23:19:44,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504803873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:44,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917078114] [2021-11-12 23:19:44,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:19:44,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:44,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:44,227 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:44,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-12 23:19:44,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-12 23:19:44,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:19:44,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 23:19:44,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:44,569 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 33 proven. 48 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-11-12 23:19:44,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:45,951 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 41 proven. 55 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-12 23:19:45,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917078114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:45,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [527042119] [2021-11-12 23:19:45,954 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:19:45,954 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:45,955 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) [2021-11-12 23:19:45,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:45,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2021-11-12 23:19:45,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233570849] [2021-11-12 23:19:45,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:45,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-12 23:19:45,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:45,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-12 23:19:45,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-11-12 23:19:45,959 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) [2021-11-12 23:19:54,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:54,150 INFO L93 Difference]: Finished difference Result 17825 states and 38704 transitions. [2021-11-12 23:19:54,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2021-11-12 23:19:54,151 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 87 [2021-11-12 23:19:54,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:54,309 INFO L225 Difference]: With dead ends: 17825 [2021-11-12 23:19:54,309 INFO L226 Difference]: Without dead ends: 14316 [2021-11-12 23:19:54,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15342 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=6608, Invalid=36448, Unknown=0, NotChecked=0, Total=43056 [2021-11-12 23:19:54,359 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 335 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 2459 mSolverCounterSat, 1360 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1541.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 3819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 15.41ms SdHoareTripleChecker+Time, 1360 IncrementalHoareTripleChecker+Valid, 2459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1855.62ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:54,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 329 Invalid, 3819 Unknown, 0 Unchecked, 15.41ms Time], IncrementalHoareTripleChecker [1360 Valid, 2459 Invalid, 0 Unknown, 0 Unchecked, 1855.62ms Time] [2021-11-12 23:19:54,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14316 states. [2021-11-12 23:19:55,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14316 to 7630. [2021-11-12 23:19:55,484 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) [2021-11-12 23:19:55,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7630 states to 7630 states and 14701 transitions. [2021-11-12 23:19:55,552 INFO L78 Accepts]: Start accepts. Automaton has 7630 states and 14701 transitions. Word has length 87 [2021-11-12 23:19:55,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:55,552 INFO L470 AbstractCegarLoop]: Abstraction has 7630 states and 14701 transitions. [2021-11-12 23:19:55,553 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) [2021-11-12 23:19:55,553 INFO L276 IsEmpty]: Start isEmpty. Operand 7630 states and 14701 transitions. [2021-11-12 23:19:55,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-12 23:19:55,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:55,557 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] [2021-11-12 23:19:55,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:55,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:55,780 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:19:55,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:55,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1101938774, now seen corresponding path program 2 times [2021-11-12 23:19:55,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:55,781 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243248261] [2021-11-12 23:19:55,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:55,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:55,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:55,965 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 93 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:19:55,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:55,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243248261] [2021-11-12 23:19:55,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243248261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:19:55,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387849266] [2021-11-12 23:19:55,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:19:55,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:19:55,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:19:55,967 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:19:55,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-12 23:19:56,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 23:19:56,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:19:56,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 23:19:56,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:19:56,182 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 85 proven. 40 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:19:56,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:19:56,923 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 105 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:19:56,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387849266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:19:56,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729161809] [2021-11-12 23:19:56,925 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:19:56,925 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:19:56,926 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) [2021-11-12 23:19:56,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:19:56,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2021-11-12 23:19:56,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631660673] [2021-11-12 23:19:56,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:19:56,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 23:19:56,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:56,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 23:19:56,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 23:19:56,930 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) [2021-11-12 23:19:59,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:59,253 INFO L93 Difference]: Finished difference Result 14577 states and 29711 transitions. [2021-11-12 23:19:59,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-12 23:19:59,253 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 [2021-11-12 23:19:59,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:59,293 INFO L225 Difference]: With dead ends: 14577 [2021-11-12 23:19:59,293 INFO L226 Difference]: Without dead ends: 7325 [2021-11-12 23:19:59,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2018 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2021-11-12 23:19:59,369 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 288 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 984 mSolverCounterSat, 410 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 469.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 1394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.15ms SdHoareTripleChecker+Time, 410 IncrementalHoareTripleChecker+Valid, 984 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 568.66ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:59,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 305 Invalid, 1394 Unknown, 0 Unchecked, 4.15ms Time], IncrementalHoareTripleChecker [410 Valid, 984 Invalid, 0 Unknown, 0 Unchecked, 568.66ms Time] [2021-11-12 23:19:59,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7325 states. [2021-11-12 23:19:59,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7325 to 6147. [2021-11-12 23:19:59,994 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) [2021-11-12 23:20:00,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6147 states to 6147 states and 8996 transitions. [2021-11-12 23:20:00,024 INFO L78 Accepts]: Start accepts. Automaton has 6147 states and 8996 transitions. Word has length 80 [2021-11-12 23:20:00,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:00,024 INFO L470 AbstractCegarLoop]: Abstraction has 6147 states and 8996 transitions. [2021-11-12 23:20:00,025 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) [2021-11-12 23:20:00,025 INFO L276 IsEmpty]: Start isEmpty. Operand 6147 states and 8996 transitions. [2021-11-12 23:20:00,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-12 23:20:00,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:00,036 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-12 23:20:00,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:00,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:00,264 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:00,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:00,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1394163817, now seen corresponding path program 3 times [2021-11-12 23:20:00,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:00,265 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198328261] [2021-11-12 23:20:00,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:00,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:00,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:00,586 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:00,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:00,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198328261] [2021-11-12 23:20:00,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198328261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:00,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755894791] [2021-11-12 23:20:00,587 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:20:00,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:00,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:00,588 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:00,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-12 23:20:00,660 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:20:00,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:20:00,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-12 23:20:00,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:00,886 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:00,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:01,484 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:01,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755894791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:01,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1827344376] [2021-11-12 23:20:01,486 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-12 23:20:01,486 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:01,486 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) [2021-11-12 23:20:01,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:01,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2021-11-12 23:20:01,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051663356] [2021-11-12 23:20:01,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:01,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-12 23:20:01,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:01,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-12 23:20:01,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2021-11-12 23:20:01,501 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) [2021-11-12 23:20:03,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:03,035 INFO L93 Difference]: Finished difference Result 9752 states and 13964 transitions. [2021-11-12 23:20:03,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-12 23:20:03,037 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 [2021-11-12 23:20:03,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:03,080 INFO L225 Difference]: With dead ends: 9752 [2021-11-12 23:20:03,080 INFO L226 Difference]: Without dead ends: 9751 [2021-11-12 23:20:03,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2021-11-12 23:20:03,087 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 1220 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 626 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 443.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1224 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 1495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.37ms SdHoareTripleChecker+Time, 626 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 547.14ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:03,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1224 Valid, 664 Invalid, 1495 Unknown, 0 Unchecked, 7.37ms Time], IncrementalHoareTripleChecker [626 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 547.14ms Time] [2021-11-12 23:20:03,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9751 states. [2021-11-12 23:20:03,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9751 to 9411. [2021-11-12 23:20:03,785 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) [2021-11-12 23:20:03,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9411 states to 9411 states and 13604 transitions. [2021-11-12 23:20:03,836 INFO L78 Accepts]: Start accepts. Automaton has 9411 states and 13604 transitions. Word has length 91 [2021-11-12 23:20:03,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:03,837 INFO L470 AbstractCegarLoop]: Abstraction has 9411 states and 13604 transitions. [2021-11-12 23:20:03,837 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) [2021-11-12 23:20:03,838 INFO L276 IsEmpty]: Start isEmpty. Operand 9411 states and 13604 transitions. [2021-11-12 23:20:03,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-12 23:20:03,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:03,846 INFO L514 BasicCegarLoop]: trace histogram [15, 10, 10, 7, 7, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-12 23:20:03,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:04,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:04,061 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:04,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:04,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1744138843, now seen corresponding path program 3 times [2021-11-12 23:20:04,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:04,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535344151] [2021-11-12 23:20:04,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:04,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:04,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:04,189 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 222 proven. 52 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2021-11-12 23:20:04,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:04,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535344151] [2021-11-12 23:20:04,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535344151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:04,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284972029] [2021-11-12 23:20:04,190 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:20:04,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:04,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:04,191 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:04,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-12 23:20:04,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:20:04,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:20:04,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 23:20:04,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:04,503 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 233 proven. 26 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-12 23:20:04,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:05,610 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 194 proven. 59 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-12 23:20:05,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284972029] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:05,610 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245632053] [2021-11-12 23:20:05,615 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:20:05,615 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:05,616 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) [2021-11-12 23:20:05,616 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:05,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 15 [2021-11-12 23:20:05,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238652257] [2021-11-12 23:20:05,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:05,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-12 23:20:05,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:05,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-12 23:20:05,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-12 23:20:05,619 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) [2021-11-12 23:20:06,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:06,394 INFO L93 Difference]: Finished difference Result 19790 states and 40674 transitions. [2021-11-12 23:20:06,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 23:20:06,395 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 131 [2021-11-12 23:20:06,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:06,472 INFO L225 Difference]: With dead ends: 19790 [2021-11-12 23:20:06,472 INFO L226 Difference]: Without dead ends: 12059 [2021-11-12 23:20:06,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 267 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=295, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:20:06,529 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 143 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 216.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.29ms SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 240.56ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:06,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 149 Invalid, 315 Unknown, 0 Unchecked, 1.29ms Time], IncrementalHoareTripleChecker [86 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 240.56ms Time] [2021-11-12 23:20:06,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12059 states. [2021-11-12 23:20:07,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12059 to 9900. [2021-11-12 23:20:07,596 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) [2021-11-12 23:20:07,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14245 transitions. [2021-11-12 23:20:07,644 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14245 transitions. Word has length 131 [2021-11-12 23:20:07,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:07,644 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14245 transitions. [2021-11-12 23:20:07,645 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) [2021-11-12 23:20:07,645 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14245 transitions. [2021-11-12 23:20:07,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-12 23:20:07,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:07,651 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] [2021-11-12 23:20:07,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:07,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-12 23:20:07,866 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:07,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:07,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1912996866, now seen corresponding path program 3 times [2021-11-12 23:20:07,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:07,867 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087333891] [2021-11-12 23:20:07,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:07,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:07,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:08,191 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 189 proven. 185 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:20:08,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:08,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087333891] [2021-11-12 23:20:08,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087333891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:08,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714271004] [2021-11-12 23:20:08,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:20:08,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:08,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:08,193 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:08,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-12 23:20:08,310 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:20:08,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:20:08,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-12 23:20:08,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:08,586 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 181 proven. 188 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:20:08,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:09,829 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 201 proven. 173 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:20:09,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714271004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:09,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696517934] [2021-11-12 23:20:09,831 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:20:09,831 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:09,832 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) [2021-11-12 23:20:09,833 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:09,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2021-11-12 23:20:09,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349249983] [2021-11-12 23:20:09,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:09,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-12 23:20:09,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:09,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-12 23:20:09,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2021-11-12 23:20:09,841 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) [2021-11-12 23:20:11,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:11,672 INFO L93 Difference]: Finished difference Result 10597 states and 15041 transitions. [2021-11-12 23:20:11,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-12 23:20:11,672 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 [2021-11-12 23:20:11,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:11,717 INFO L225 Difference]: With dead ends: 10597 [2021-11-12 23:20:11,717 INFO L226 Difference]: Without dead ends: 10596 [2021-11-12 23:20:11,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1858, Invalid=6514, Unknown=0, NotChecked=0, Total=8372 [2021-11-12 23:20:11,724 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 268 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 393.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.28ms SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 466.02ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:11,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 301 Invalid, 1157 Unknown, 0 Unchecked, 3.28ms Time], IncrementalHoareTripleChecker [322 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 466.02ms Time] [2021-11-12 23:20:11,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10596 states. [2021-11-12 23:20:12,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10596 to 9900. [2021-11-12 23:20:12,540 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) [2021-11-12 23:20:12,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14230 transitions. [2021-11-12 23:20:12,598 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14230 transitions. Word has length 112 [2021-11-12 23:20:12,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:12,598 INFO L470 AbstractCegarLoop]: Abstraction has 9900 states and 14230 transitions. [2021-11-12 23:20:12,599 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) [2021-11-12 23:20:12,599 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14230 transitions. [2021-11-12 23:20:12,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-12 23:20:12,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:12,611 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] [2021-11-12 23:20:12,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:12,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-12 23:20:12,836 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:12,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:12,837 INFO L85 PathProgramCache]: Analyzing trace with hash 806548701, now seen corresponding path program 4 times [2021-11-12 23:20:12,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:12,837 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997236336] [2021-11-12 23:20:12,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:12,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:12,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:13,167 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 167 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-12 23:20:13,168 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:13,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997236336] [2021-11-12 23:20:13,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997236336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:13,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586200679] [2021-11-12 23:20:13,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 23:20:13,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:13,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:13,176 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:13,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-12 23:20:13,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:13,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-12 23:20:13,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:13,690 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 62 proven. 154 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2021-11-12 23:20:13,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:17,263 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 217 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2021-11-12 23:20:17,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586200679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:17,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1770240202] [2021-11-12 23:20:17,265 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:20:17,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:17,265 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) [2021-11-12 23:20:17,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:17,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2021-11-12 23:20:17,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578914384] [2021-11-12 23:20:17,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:17,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-12 23:20:17,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:17,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-12 23:20:17,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2021-11-12 23:20:17,267 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) [2021-11-12 23:20:32,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:32,894 INFO L93 Difference]: Finished difference Result 70704 states and 137719 transitions. [2021-11-12 23:20:32,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2021-11-12 23:20:32,895 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 [2021-11-12 23:20:32,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:33,665 INFO L225 Difference]: With dead ends: 70704 [2021-11-12 23:20:33,665 INFO L226 Difference]: Without dead ends: 69682 [2021-11-12 23:20:33,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69933 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=25690, Invalid=135512, Unknown=0, NotChecked=0, Total=161202 [2021-11-12 23:20:33,726 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 322 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 1963 mSolverCounterSat, 3105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1795.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 5068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.94ms SdHoareTripleChecker+Time, 3105 IncrementalHoareTripleChecker+Valid, 1963 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2115.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:33,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 246 Invalid, 5068 Unknown, 0 Unchecked, 11.94ms Time], IncrementalHoareTripleChecker [3105 Valid, 1963 Invalid, 0 Unknown, 0 Unchecked, 2115.63ms Time] [2021-11-12 23:20:33,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69682 states. [2021-11-12 23:20:37,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69682 to 17261. [2021-11-12 23:20:37,091 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) [2021-11-12 23:20:37,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17261 states to 17261 states and 28564 transitions. [2021-11-12 23:20:37,190 INFO L78 Accepts]: Start accepts. Automaton has 17261 states and 28564 transitions. Word has length 127 [2021-11-12 23:20:37,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:37,191 INFO L470 AbstractCegarLoop]: Abstraction has 17261 states and 28564 transitions. [2021-11-12 23:20:37,191 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) [2021-11-12 23:20:37,191 INFO L276 IsEmpty]: Start isEmpty. Operand 17261 states and 28564 transitions. [2021-11-12 23:20:37,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-12 23:20:37,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:37,221 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-12 23:20:37,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:37,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-12 23:20:37,448 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:37,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:37,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1011893903, now seen corresponding path program 4 times [2021-11-12 23:20:37,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:37,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110304034] [2021-11-12 23:20:37,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:37,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:37,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:38,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:38,304 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:38,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110304034] [2021-11-12 23:20:38,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110304034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:38,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936281543] [2021-11-12 23:20:38,305 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 23:20:38,305 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:38,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:38,305 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:38,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-12 23:20:38,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:38,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-12 23:20:38,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:38,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:38,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:40,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:20:40,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936281543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:40,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597176555] [2021-11-12 23:20:40,810 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-12 23:20:40,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:40,811 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) [2021-11-12 23:20:40,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:40,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2021-11-12 23:20:40,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441208111] [2021-11-12 23:20:40,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:40,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-12 23:20:40,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:40,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-12 23:20:40,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2021-11-12 23:20:40,816 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) [2021-11-12 23:20:46,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:46,252 INFO L93 Difference]: Finished difference Result 28594 states and 45424 transitions. [2021-11-12 23:20:46,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-12 23:20:46,252 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 [2021-11-12 23:20:46,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:46,385 INFO L225 Difference]: With dead ends: 28594 [2021-11-12 23:20:46,385 INFO L226 Difference]: Without dead ends: 28593 [2021-11-12 23:20:46,401 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 [2021-11-12 23:20:46,402 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 2372 mSDsluCounter, 1301 mSDsCounter, 0 mSdLazyCounter, 1816 mSolverCounterSat, 1547 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1002.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2376 SdHoareTripleChecker+Valid, 1406 SdHoareTripleChecker+Invalid, 3363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.16ms SdHoareTripleChecker+Time, 1547 IncrementalHoareTripleChecker+Valid, 1816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1222.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:46,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2376 Valid, 1406 Invalid, 3363 Unknown, 0 Unchecked, 11.16ms Time], IncrementalHoareTripleChecker [1547 Valid, 1816 Invalid, 0 Unknown, 0 Unchecked, 1222.00ms Time] [2021-11-12 23:20:46,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28593 states. [2021-11-12 23:20:48,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28593 to 27869. [2021-11-12 23:20:48,222 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) [2021-11-12 23:20:48,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27869 states to 27869 states and 44668 transitions. [2021-11-12 23:20:48,368 INFO L78 Accepts]: Start accepts. Automaton has 27869 states and 44668 transitions. Word has length 187 [2021-11-12 23:20:48,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:48,369 INFO L470 AbstractCegarLoop]: Abstraction has 27869 states and 44668 transitions. [2021-11-12 23:20:48,369 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) [2021-11-12 23:20:48,369 INFO L276 IsEmpty]: Start isEmpty. Operand 27869 states and 44668 transitions. [2021-11-12 23:20:48,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2021-11-12 23:20:48,414 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:48,414 INFO L514 BasicCegarLoop]: trace histogram [36, 27, 23, 23, 23, 22, 22, 22, 21, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-12 23:20:48,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-12 23:20:48,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-12 23:20:48,640 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-12 23:20:48,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:48,641 INFO L85 PathProgramCache]: Analyzing trace with hash -340044641, now seen corresponding path program 1 times [2021-11-12 23:20:48,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:48,641 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519803102] [2021-11-12 23:20:48,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:48,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:48,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:49,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3448 backedges. 592 proven. 278 refuted. 0 times theorem prover too weak. 2578 trivial. 0 not checked. [2021-11-12 23:20:49,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:49,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519803102] [2021-11-12 23:20:49,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519803102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:20:49,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663011271] [2021-11-12 23:20:49,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:49,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:20:49,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:20:49,317 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:20:49,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_750907a8-bc68-429f-a498-3f27a0458f6e/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-12 23:20:49,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:49,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-12 23:20:49,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:20:50,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3448 backedges. 1200 proven. 324 refuted. 0 times theorem prover too weak. 1924 trivial. 0 not checked. [2021-11-12 23:20:50,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:20:53,715 INFO L134 CoverageAnalysis]: Checked inductivity of 3448 backedges. 1223 proven. 436 refuted. 0 times theorem prover too weak. 1789 trivial. 0 not checked. [2021-11-12 23:20:53,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663011271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:20:53,715 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595471577] [2021-11-12 23:20:53,717 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-12 23:20:53,717 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:20:53,717 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) [2021-11-12 23:20:53,719 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:20:53,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2021-11-12 23:20:53,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822520493] [2021-11-12 23:20:53,719 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:20:53,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-12 23:20:53,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:53,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-12 23:20:53,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 23:20:53,722 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) [2021-11-12 23:21:25,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:21:25,120 INFO L93 Difference]: Finished difference Result 207634 states and 800017 transitions. [2021-11-12 23:21:25,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 375 states. [2021-11-12 23:21:25,121 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 318 [2021-11-12 23:21:25,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:21:28,679 INFO L225 Difference]: With dead ends: 207634 [2021-11-12 23:21:28,679 INFO L226 Difference]: Without dead ends: 185477 [2021-11-12 23:21:29,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1049 GetRequests, 626 SyntacticMatches, 3 SemanticMatches, 420 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73619 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=24328, Invalid=153334, Unknown=0, NotChecked=0, Total=177662 [2021-11-12 23:21:29,853 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 519 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 7149 mSolverCounterSat, 3197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4020.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 10346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 28.87ms SdHoareTripleChecker+Time, 3197 IncrementalHoareTripleChecker+Valid, 7149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4719.77ms IncrementalHoareTripleChecker+Time [2021-11-12 23:21:29,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [519 Valid, 476 Invalid, 10346 Unknown, 0 Unchecked, 28.87ms Time], IncrementalHoareTripleChecker [3197 Valid, 7149 Invalid, 0 Unknown, 0 Unchecked, 4719.77ms Time] [2021-11-12 23:21:29,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185477 states.