./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:02:56,590 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:02:56,592 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:02:56,614 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:02:56,614 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:02:56,616 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:02:56,617 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:02:56,620 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:02:56,622 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:02:56,623 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:02:56,624 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:02:56,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:02:56,626 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:02:56,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:02:56,629 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:02:56,630 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:02:56,631 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:02:56,632 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:02:56,635 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:02:56,637 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:02:56,638 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:02:56,656 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:02:56,657 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:02:56,658 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:02:56,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:02:56,662 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:02:56,663 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:02:56,664 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:02:56,664 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:02:56,665 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:02:56,665 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:02:56,666 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:02:56,667 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:02:56,668 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:02:56,669 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:02:56,670 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:02:56,679 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:02:56,680 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:02:56,681 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:02:56,685 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:02:56,696 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:02:56,697 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-11-22 02:02:56,738 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:02:56,738 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:02:56,739 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:02:56,739 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:02:56,740 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:02:56,741 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:02:56,741 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:02:56,741 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:02:56,742 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:02:56,742 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:02:56,743 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:02:56,744 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:02:56,744 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:02:56,744 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:02:56,745 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:02:56,745 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:02:56,746 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:02:56,746 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:02:56,747 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:02:56,747 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:02:56,747 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-22 02:02:56,748 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:02:56,748 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:02:56,748 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:02:56,749 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:02:56,749 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:02:56,749 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:02:56,750 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-11-22 02:02:56,750 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:02:56,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:02:56,751 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:02:56,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:02:56,752 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:02:56,752 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:02:56,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:02:56,753 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:02:56,753 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:02:56,753 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:02:56,754 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:02:56,754 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:02:56,754 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:02:56,755 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:02:56,755 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:02:56,755 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2022-11-22 02:02:57,092 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:02:57,197 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:02:57,200 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:02:57,202 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:02:57,215 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:02:57,217 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/recursive/Ackermann03.c [2022-11-22 02:03:00,434 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:03:00,682 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:03:00,683 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/sv-benchmarks/c/recursive/Ackermann03.c [2022-11-22 02:03:00,690 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/data/0eae4edd4/778045b7ee454231afc03a58486e72c8/FLAG253411867 [2022-11-22 02:03:00,731 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/data/0eae4edd4/778045b7ee454231afc03a58486e72c8 [2022-11-22 02:03:00,734 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:03:00,736 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:03:00,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:03:00,738 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:03:00,741 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:03:00,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:00,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6338a6ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00, skipping insertion in model container [2022-11-22 02:03:00,744 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:00,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:03:00,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:03:00,947 WARN L237 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_4ced38b8-33bb-48b2-9254-68aa34d36bd3/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2022-11-22 02:03:00,948 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:03:00,958 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:03:00,972 WARN L237 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_4ced38b8-33bb-48b2-9254-68aa34d36bd3/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2022-11-22 02:03:00,973 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:03:00,987 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:03:00,987 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00 WrapperNode [2022-11-22 02:03:00,987 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:03:00,989 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:03:00,989 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:03:00,989 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:03:00,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,004 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,021 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 32 [2022-11-22 02:03:01,021 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:03:01,022 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:03:01,022 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:03:01,022 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:03:01,031 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,032 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,033 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,038 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,039 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,040 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,042 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:03:01,043 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:03:01,043 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:03:01,043 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:03:01,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (1/1) ... [2022-11-22 02:03:01,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:03:01,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:01,076 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:03:01,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:03:01,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:03:01,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:03:01,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:03:01,123 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2022-11-22 02:03:01,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2022-11-22 02:03:01,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:03:01,200 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:03:01,203 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:03:01,438 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:03:01,469 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:03:01,482 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-22 02:03:01,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:03:01 BoogieIcfgContainer [2022-11-22 02:03:01,485 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:03:01,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:03:01,501 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:03:01,504 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:03:01,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:03:00" (1/3) ... [2022-11-22 02:03:01,506 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54d05b6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:03:01, skipping insertion in model container [2022-11-22 02:03:01,506 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:03:00" (2/3) ... [2022-11-22 02:03:01,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54d05b6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:03:01, skipping insertion in model container [2022-11-22 02:03:01,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:03:01" (3/3) ... [2022-11-22 02:03:01,521 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2022-11-22 02:03:01,571 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:03:01,572 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2022-11-22 02:03:01,672 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:03:01,679 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@66454ee2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:03:01,680 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2022-11-22 02:03:01,683 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) [2022-11-22 02:03:01,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 02:03:01,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:01,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:01,692 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:01,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:01,697 INFO L85 PathProgramCache]: Analyzing trace with hash 401720455, now seen corresponding path program 1 times [2022-11-22 02:03:01,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:01,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321370681] [2022-11-22 02:03:01,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:01,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:01,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:02,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:02,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:02,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321370681] [2022-11-22 02:03:02,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321370681] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:02,003 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:02,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:02,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673541980] [2022-11-22 02:03:02,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:02,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:02,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:02,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:02,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:03:02,058 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) [2022-11-22 02:03:02,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:02,223 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2022-11-22 02:03:02,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:03:02,227 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 [2022-11-22 02:03:02,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:02,235 INFO L225 Difference]: With dead ends: 65 [2022-11-22 02:03:02,236 INFO L226 Difference]: Without dead ends: 58 [2022-11-22 02:03:02,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:03:02,242 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 52 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:02,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 95 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:02,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-22 02:03:02,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2022-11-22 02:03:02,284 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) [2022-11-22 02:03:02,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2022-11-22 02:03:02,288 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2022-11-22 02:03:02,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:02,289 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2022-11-22 02:03:02,289 INFO L496 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) [2022-11-22 02:03:02,289 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2022-11-22 02:03:02,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:03:02,290 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:02,290 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:02,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:03:02,291 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:02,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:02,292 INFO L85 PathProgramCache]: Analyzing trace with hash -431562724, now seen corresponding path program 1 times [2022-11-22 02:03:02,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:02,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227513027] [2022-11-22 02:03:02,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:02,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:02,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:02,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:02,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:02,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227513027] [2022-11-22 02:03:02,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227513027] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:02,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:02,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:02,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784303170] [2022-11-22 02:03:02,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:02,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:02,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:02,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:02,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:03:02,434 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) [2022-11-22 02:03:02,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:02,494 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2022-11-22 02:03:02,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:03:02,495 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 [2022-11-22 02:03:02,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:02,496 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:03:02,496 INFO L226 Difference]: Without dead ends: 48 [2022-11-22 02:03:02,497 INFO L412 NwaCegarLoop]: 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 [2022-11-22 02:03:02,498 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:02,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:03:02,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-22 02:03:02,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-22 02:03:02,518 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) [2022-11-22 02:03:02,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2022-11-22 02:03:02,523 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 8 [2022-11-22 02:03:02,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:02,523 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2022-11-22 02:03:02,524 INFO L496 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) [2022-11-22 02:03:02,524 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2022-11-22 02:03:02,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:03:02,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:02,525 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:02,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:03:02,525 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:02,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:02,526 INFO L85 PathProgramCache]: Analyzing trace with hash -431567721, now seen corresponding path program 1 times [2022-11-22 02:03:02,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:02,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767654191] [2022-11-22 02:03:02,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:02,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:02,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:02,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:02,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:02,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767654191] [2022-11-22 02:03:02,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767654191] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:02,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:02,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:02,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723164194] [2022-11-22 02:03:02,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:02,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:02,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:02,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:02,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:03:02,609 INFO L87 Difference]: Start difference. First operand 48 states and 60 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) [2022-11-22 02:03:02,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:02,694 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2022-11-22 02:03:02,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:03:02,695 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 [2022-11-22 02:03:02,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:02,697 INFO L225 Difference]: With dead ends: 75 [2022-11-22 02:03:02,697 INFO L226 Difference]: Without dead ends: 74 [2022-11-22 02:03:02,697 INFO L412 NwaCegarLoop]: 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 [2022-11-22 02:03:02,699 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 43 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:02,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 80 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:02,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-22 02:03:02,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 67. [2022-11-22 02:03:02,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 54 states have internal predecessors, (67), 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) [2022-11-22 02:03:02,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2022-11-22 02:03:02,733 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 8 [2022-11-22 02:03:02,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:02,734 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2022-11-22 02:03:02,734 INFO L496 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) [2022-11-22 02:03:02,734 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2022-11-22 02:03:02,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-22 02:03:02,735 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:02,735 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:02,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 02:03:02,736 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:02,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:02,736 INFO L85 PathProgramCache]: Analyzing trace with hash -493542486, now seen corresponding path program 1 times [2022-11-22 02:03:02,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:02,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360526935] [2022-11-22 02:03:02,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:02,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:02,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:02,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:02,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:02,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360526935] [2022-11-22 02:03:02,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360526935] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:02,847 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:02,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:02,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658838074] [2022-11-22 02:03:02,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:02,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:02,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:02,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:02,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:03:02,849 INFO L87 Difference]: Start difference. First operand 67 states and 86 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) [2022-11-22 02:03:03,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:03,037 INFO L93 Difference]: Finished difference Result 115 states and 155 transitions. [2022-11-22 02:03:03,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:03:03,044 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 [2022-11-22 02:03:03,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:03,046 INFO L225 Difference]: With dead ends: 115 [2022-11-22 02:03:03,047 INFO L226 Difference]: Without dead ends: 107 [2022-11-22 02:03:03,047 INFO L412 NwaCegarLoop]: 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 [2022-11-22 02:03:03,049 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:03,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 78 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:03,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-22 02:03:03,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 99. [2022-11-22 02:03:03,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.3424657534246576) internal successors, (98), 80 states have internal predecessors, (98), 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) [2022-11-22 02:03:03,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 127 transitions. [2022-11-22 02:03:03,082 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 127 transitions. Word has length 9 [2022-11-22 02:03:03,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:03,083 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 127 transitions. [2022-11-22 02:03:03,083 INFO L496 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) [2022-11-22 02:03:03,084 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 127 transitions. [2022-11-22 02:03:03,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-22 02:03:03,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:03,085 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:03,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 02:03:03,085 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:03,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:03,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1841244045, now seen corresponding path program 1 times [2022-11-22 02:03:03,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:03,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549241352] [2022-11-22 02:03:03,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:03,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:03,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,164 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:03,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549241352] [2022-11-22 02:03:03,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549241352] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:03,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:03,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:03,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470627060] [2022-11-22 02:03:03,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:03,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:03,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:03,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:03,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:03:03,168 INFO L87 Difference]: Start difference. First operand 99 states and 127 transitions. Second operand has 5 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-22 02:03:03,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:03,253 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2022-11-22 02:03:03,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:03:03,254 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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 11 [2022-11-22 02:03:03,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:03,256 INFO L225 Difference]: With dead ends: 108 [2022-11-22 02:03:03,256 INFO L226 Difference]: Without dead ends: 107 [2022-11-22 02:03:03,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:03:03,259 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 36 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:03,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 87 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:03,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-22 02:03:03,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 99. [2022-11-22 02:03:03,284 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) [2022-11-22 02:03:03,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2022-11-22 02:03:03,288 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 11 [2022-11-22 02:03:03,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:03,293 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2022-11-22 02:03:03,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-22 02:03:03,294 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2022-11-22 02:03:03,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 02:03:03,294 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:03,295 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:03,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-22 02:03:03,295 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:03,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:03,298 INFO L85 PathProgramCache]: Analyzing trace with hash 349584333, now seen corresponding path program 1 times [2022-11-22 02:03:03,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:03,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088989158] [2022-11-22 02:03:03,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:03,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:03,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:03,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088989158] [2022-11-22 02:03:03,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088989158] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:03,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:03:03,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:03:03,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102950525] [2022-11-22 02:03:03,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:03,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:03:03,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:03,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:03:03,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:03:03,381 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) [2022-11-22 02:03:03,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:03,473 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2022-11-22 02:03:03,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:03:03,474 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 [2022-11-22 02:03:03,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:03,476 INFO L225 Difference]: With dead ends: 167 [2022-11-22 02:03:03,476 INFO L226 Difference]: Without dead ends: 96 [2022-11-22 02:03:03,478 INFO L412 NwaCegarLoop]: 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 [2022-11-22 02:03:03,481 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:03,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 82 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:03,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-22 02:03:03,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2022-11-22 02:03:03,513 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) [2022-11-22 02:03:03,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2022-11-22 02:03:03,516 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 15 [2022-11-22 02:03:03,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:03,516 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2022-11-22 02:03:03,517 INFO L496 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) [2022-11-22 02:03:03,517 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2022-11-22 02:03:03,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 02:03:03,518 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:03,518 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:03,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-22 02:03:03,519 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:03,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:03,520 INFO L85 PathProgramCache]: Analyzing trace with hash 349591284, now seen corresponding path program 1 times [2022-11-22 02:03:03,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:03,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781723850] [2022-11-22 02:03:03,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:03,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:03,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,686 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:03,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781723850] [2022-11-22 02:03:03,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781723850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:03,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024724778] [2022-11-22 02:03:03,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:03,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:03,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:03,694 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:03,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:03:03,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:03:03,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:03,863 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:03,950 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024724778] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:03,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239384868] [2022-11-22 02:03:03,973 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-22 02:03:03,973 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:03,978 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:03,980 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:03,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2022-11-22 02:03:03,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736939557] [2022-11-22 02:03:03,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:03,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 02:03:03,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:03,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 02:03:03,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:03:03,982 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) [2022-11-22 02:03:04,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:04,403 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2022-11-22 02:03:04,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 02:03:04,404 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 [2022-11-22 02:03:04,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:04,408 INFO L225 Difference]: With dead ends: 273 [2022-11-22 02:03:04,408 INFO L226 Difference]: Without dead ends: 271 [2022-11-22 02:03:04,409 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:03:04,410 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 254 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:04,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 152 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:03:04,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-11-22 02:03:04,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2022-11-22 02:03:04,449 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) [2022-11-22 02:03:04,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2022-11-22 02:03:04,453 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 15 [2022-11-22 02:03:04,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:04,454 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2022-11-22 02:03:04,454 INFO L496 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) [2022-11-22 02:03:04,454 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2022-11-22 02:03:04,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 02:03:04,455 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:04,455 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:04,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:04,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:03:04,663 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:04,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:04,663 INFO L85 PathProgramCache]: Analyzing trace with hash 903853037, now seen corresponding path program 1 times [2022-11-22 02:03:04,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:04,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853556546] [2022-11-22 02:03:04,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:04,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:04,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:04,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:04,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:04,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853556546] [2022-11-22 02:03:04,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853556546] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:04,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703474828] [2022-11-22 02:03:04,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:04,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:04,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:04,806 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:04,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:03:04,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:04,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:03:04,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:04,900 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:03:04,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703474828] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:04,901 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:03:04,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2022-11-22 02:03:04,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184621703] [2022-11-22 02:03:04,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:04,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:04,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:04,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:04,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:03:04,903 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:05,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:05,024 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2022-11-22 02:03:05,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:03:05,025 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-22 02:03:05,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:05,029 INFO L225 Difference]: With dead ends: 327 [2022-11-22 02:03:05,029 INFO L226 Difference]: Without dead ends: 326 [2022-11-22 02:03:05,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:03:05,031 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 40 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:05,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 92 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:05,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-11-22 02:03:05,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2022-11-22 02:03:05,073 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) [2022-11-22 02:03:05,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2022-11-22 02:03:05,080 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 16 [2022-11-22 02:03:05,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:05,081 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2022-11-22 02:03:05,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:05,082 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2022-11-22 02:03:05,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:03:05,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:05,084 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:05,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:05,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:05,291 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:05,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:05,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1691461981, now seen corresponding path program 1 times [2022-11-22 02:03:05,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:05,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135819447] [2022-11-22 02:03:05,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:05,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:05,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:05,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:05,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:05,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135819447] [2022-11-22 02:03:05,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135819447] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:05,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596327719] [2022-11-22 02:03:05,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:05,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:05,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:05,387 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:05,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:03:05,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:05,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:03:05,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:05,499 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:05,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:05,592 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:05,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596327719] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:05,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691909487] [2022-11-22 02:03:05,599 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-22 02:03:05,599 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:05,599 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:05,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:05,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2022-11-22 02:03:05,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065098910] [2022-11-22 02:03:05,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:05,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 02:03:05,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:05,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 02:03:05,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:03:05,604 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) [2022-11-22 02:03:05,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:05,941 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2022-11-22 02:03:05,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 02:03:05,942 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 [2022-11-22 02:03:05,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:05,949 INFO L225 Difference]: With dead ends: 590 [2022-11-22 02:03:05,950 INFO L226 Difference]: Without dead ends: 589 [2022-11-22 02:03:05,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:03:05,954 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 172 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:05,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 178 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:05,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2022-11-22 02:03:06,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2022-11-22 02:03:06,034 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) [2022-11-22 02:03:06,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2022-11-22 02:03:06,040 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 19 [2022-11-22 02:03:06,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:06,041 INFO L495 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2022-11-22 02:03:06,041 INFO L496 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) [2022-11-22 02:03:06,041 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2022-11-22 02:03:06,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 02:03:06,048 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:06,048 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:06,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:06,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:06,255 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:06,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:06,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1177154428, now seen corresponding path program 1 times [2022-11-22 02:03:06,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:06,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044584120] [2022-11-22 02:03:06,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:06,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:06,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:06,431 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:03:06,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:06,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044584120] [2022-11-22 02:03:06,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044584120] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:06,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458184316] [2022-11-22 02:03:06,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:06,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:06,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:06,433 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:06,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:03:06,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:06,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 02:03:06,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:06,548 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:03:06,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:06,767 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:03:06,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458184316] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:06,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209921922] [2022-11-22 02:03:06,770 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 02:03:06,770 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:06,771 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:06,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:06,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-11-22 02:03:06,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630430220] [2022-11-22 02:03:06,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:06,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:03:06,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:06,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:03:06,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:03:06,773 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) [2022-11-22 02:03:07,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:07,166 INFO L93 Difference]: Finished difference Result 824 states and 1154 transitions. [2022-11-22 02:03:07,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:03:07,167 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 [2022-11-22 02:03:07,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:07,173 INFO L225 Difference]: With dead ends: 824 [2022-11-22 02:03:07,173 INFO L226 Difference]: Without dead ends: 822 [2022-11-22 02:03:07,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:03:07,175 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 177 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:07,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 79 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:07,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2022-11-22 02:03:07,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 747. [2022-11-22 02:03:07,258 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) [2022-11-22 02:03:07,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 952 transitions. [2022-11-22 02:03:07,267 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 952 transitions. Word has length 23 [2022-11-22 02:03:07,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:07,267 INFO L495 AbstractCegarLoop]: Abstraction has 747 states and 952 transitions. [2022-11-22 02:03:07,267 INFO L496 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) [2022-11-22 02:03:07,267 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 952 transitions. [2022-11-22 02:03:07,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 02:03:07,268 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:07,268 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:07,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:07,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:03:07,475 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:07,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:07,477 INFO L85 PathProgramCache]: Analyzing trace with hash 2132048962, now seen corresponding path program 1 times [2022-11-22 02:03:07,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:07,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352626091] [2022-11-22 02:03:07,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:07,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:07,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:07,645 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:03:07,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:07,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352626091] [2022-11-22 02:03:07,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352626091] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:07,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538839397] [2022-11-22 02:03:07,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:07,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:07,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:07,648 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:07,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:03:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:07,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:03:07,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:07,770 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:03:07,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:03:07,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538839397] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:03:07,770 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:03:07,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 10 [2022-11-22 02:03:07,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974689891] [2022-11-22 02:03:07,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:07,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:03:07,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:07,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:03:07,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-11-22 02:03:07,776 INFO L87 Difference]: Start difference. First operand 747 states and 952 transitions. Second operand has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 02:03:07,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:07,985 INFO L93 Difference]: Finished difference Result 756 states and 962 transitions. [2022-11-22 02:03:07,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:03:07,986 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-11-22 02:03:07,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:07,993 INFO L225 Difference]: With dead ends: 756 [2022-11-22 02:03:07,994 INFO L226 Difference]: Without dead ends: 755 [2022-11-22 02:03:07,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:03:07,996 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 41 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:07,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 94 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:07,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2022-11-22 02:03:08,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 746. [2022-11-22 02:03:08,074 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) [2022-11-22 02:03:08,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2022-11-22 02:03:08,082 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2022-11-22 02:03:08,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:08,083 INFO L495 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2022-11-22 02:03:08,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 6.333333333333333) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 02:03:08,083 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2022-11-22 02:03:08,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 02:03:08,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:08,085 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:08,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:08,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:08,291 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:08,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:08,292 INFO L85 PathProgramCache]: Analyzing trace with hash 2049869032, now seen corresponding path program 1 times [2022-11-22 02:03:08,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:08,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490070832] [2022-11-22 02:03:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:08,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:08,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:03:08,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:08,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490070832] [2022-11-22 02:03:08,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490070832] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:08,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271269740] [2022-11-22 02:03:08,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:08,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:08,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:08,420 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:08,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:03:08,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:08,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 02:03:08,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:08,571 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:03:08,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:08,752 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:03:08,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271269740] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:08,753 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:03:08,753 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2022-11-22 02:03:08,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023630756] [2022-11-22 02:03:08,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:08,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:03:08,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:08,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:03:08,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:03:08,756 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) [2022-11-22 02:03:09,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:09,152 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2022-11-22 02:03:09,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 02:03:09,154 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 [2022-11-22 02:03:09,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:09,161 INFO L225 Difference]: With dead ends: 901 [2022-11-22 02:03:09,161 INFO L226 Difference]: Without dead ends: 900 [2022-11-22 02:03:09,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2022-11-22 02:03:09,163 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 52 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:09,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 97 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:09,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2022-11-22 02:03:09,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2022-11-22 02:03:09,264 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) [2022-11-22 02:03:09,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2022-11-22 02:03:09,274 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 27 [2022-11-22 02:03:09,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:09,275 INFO L495 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2022-11-22 02:03:09,275 INFO L496 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) [2022-11-22 02:03:09,275 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2022-11-22 02:03:09,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 02:03:09,277 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:09,277 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:09,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-22 02:03:09,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 02:03:09,491 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:09,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:09,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1228982289, now seen corresponding path program 1 times [2022-11-22 02:03:09,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:09,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801945461] [2022-11-22 02:03:09,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:09,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:09,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:09,626 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:09,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:09,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801945461] [2022-11-22 02:03:09,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801945461] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:09,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305640138] [2022-11-22 02:03:09,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:09,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:09,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:09,629 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:09,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:03:09,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:09,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:03:09,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:09,771 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:09,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:10,081 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:10,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305640138] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:10,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917921899] [2022-11-22 02:03:10,085 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:03:10,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:10,086 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:10,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:10,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2022-11-22 02:03:10,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829383839] [2022-11-22 02:03:10,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:10,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:03:10,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:10,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:03:10,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2022-11-22 02:03:10,105 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) [2022-11-22 02:03:10,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:10,997 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2022-11-22 02:03:10,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:03:10,998 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 [2022-11-22 02:03:10,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:11,012 INFO L225 Difference]: With dead ends: 1544 [2022-11-22 02:03:11,012 INFO L226 Difference]: Without dead ends: 1542 [2022-11-22 02:03:11,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=188, Invalid=682, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:03:11,015 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 131 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:11,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 170 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:03:11,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2022-11-22 02:03:11,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2022-11-22 02:03:11,250 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) [2022-11-22 02:03:11,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2022-11-22 02:03:11,268 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 32 [2022-11-22 02:03:11,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:11,270 INFO L495 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2022-11-22 02:03:11,270 INFO L496 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) [2022-11-22 02:03:11,271 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2022-11-22 02:03:11,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-22 02:03:11,274 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:11,274 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:11,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:11,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:03:11,484 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:11,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:11,485 INFO L85 PathProgramCache]: Analyzing trace with hash -845541166, now seen corresponding path program 2 times [2022-11-22 02:03:11,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:11,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636206403] [2022-11-22 02:03:11,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:11,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:11,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:03:11,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:11,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636206403] [2022-11-22 02:03:11,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636206403] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:11,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645474300] [2022-11-22 02:03:11,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:11,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:11,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:11,719 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:11,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:03:11,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:03:11,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:11,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:03:11,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:11,861 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:03:11,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:12,114 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:03:12,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645474300] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:12,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1008892611] [2022-11-22 02:03:12,117 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 02:03:12,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:12,118 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:12,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:12,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2022-11-22 02:03:12,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035131446] [2022-11-22 02:03:12,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:12,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:03:12,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:12,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:03:12,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2022-11-22 02:03:12,120 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) [2022-11-22 02:03:13,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:13,278 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2022-11-22 02:03:13,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:03:13,279 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 [2022-11-22 02:03:13,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:13,301 INFO L225 Difference]: With dead ends: 2153 [2022-11-22 02:03:13,301 INFO L226 Difference]: Without dead ends: 2119 [2022-11-22 02:03:13,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:03:13,307 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 421 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 421 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:13,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [421 Valid, 163 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:03:13,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2022-11-22 02:03:13,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1968. [2022-11-22 02:03:13,610 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) [2022-11-22 02:03:13,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1968 states to 1968 states and 2844 transitions. [2022-11-22 02:03:13,630 INFO L78 Accepts]: Start accepts. Automaton has 1968 states and 2844 transitions. Word has length 35 [2022-11-22 02:03:13,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:13,631 INFO L495 AbstractCegarLoop]: Abstraction has 1968 states and 2844 transitions. [2022-11-22 02:03:13,631 INFO L496 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) [2022-11-22 02:03:13,631 INFO L276 IsEmpty]: Start isEmpty. Operand 1968 states and 2844 transitions. [2022-11-22 02:03:13,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 02:03:13,635 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:13,635 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:13,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:13,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:13,842 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:13,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:13,843 INFO L85 PathProgramCache]: Analyzing trace with hash 1557551067, now seen corresponding path program 1 times [2022-11-22 02:03:13,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:13,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362493606] [2022-11-22 02:03:13,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:13,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:13,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:13,979 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:13,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:13,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362493606] [2022-11-22 02:03:13,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362493606] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:13,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559614613] [2022-11-22 02:03:13,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:13,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:13,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:13,982 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:14,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:03:14,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:14,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:03:14,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:14,137 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:14,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:14,423 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:14,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559614613] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:14,424 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:03:14,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2022-11-22 02:03:14,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720335274] [2022-11-22 02:03:14,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:03:14,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:03:14,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:14,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:03:14,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-11-22 02:03:14,426 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) [2022-11-22 02:03:14,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:14,967 INFO L93 Difference]: Finished difference Result 2200 states and 3487 transitions. [2022-11-22 02:03:14,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:03:14,968 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 [2022-11-22 02:03:14,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:14,986 INFO L225 Difference]: With dead ends: 2200 [2022-11-22 02:03:14,986 INFO L226 Difference]: Without dead ends: 2199 [2022-11-22 02:03:14,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:03:14,990 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 63 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:14,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 130 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:14,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2022-11-22 02:03:15,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 1976. [2022-11-22 02:03:15,266 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) [2022-11-22 02:03:15,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1976 states to 1976 states and 2707 transitions. [2022-11-22 02:03:15,281 INFO L78 Accepts]: Start accepts. Automaton has 1976 states and 2707 transitions. Word has length 36 [2022-11-22 02:03:15,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:15,282 INFO L495 AbstractCegarLoop]: Abstraction has 1976 states and 2707 transitions. [2022-11-22 02:03:15,282 INFO L496 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) [2022-11-22 02:03:15,282 INFO L276 IsEmpty]: Start isEmpty. Operand 1976 states and 2707 transitions. [2022-11-22 02:03:15,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-22 02:03:15,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:15,285 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:15,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:15,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:03:15,492 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:15,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:15,492 INFO L85 PathProgramCache]: Analyzing trace with hash 791969396, now seen corresponding path program 1 times [2022-11-22 02:03:15,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:15,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476068508] [2022-11-22 02:03:15,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:15,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:15,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:15,584 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:03:15,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:15,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476068508] [2022-11-22 02:03:15,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476068508] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:15,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519173435] [2022-11-22 02:03:15,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:15,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:15,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:15,587 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:15,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:03:15,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:15,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:03:15,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:15,705 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:03:15,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:15,893 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:03:15,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519173435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:15,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [475027089] [2022-11-22 02:03:15,896 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-22 02:03:15,896 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:15,897 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:15,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:15,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2022-11-22 02:03:15,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316995075] [2022-11-22 02:03:15,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:15,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:03:15,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:15,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:03:15,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-22 02:03:15,899 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) [2022-11-22 02:03:16,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:16,322 INFO L93 Difference]: Finished difference Result 3068 states and 4537 transitions. [2022-11-22 02:03:16,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:03:16,323 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 [2022-11-22 02:03:16,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:16,334 INFO L225 Difference]: With dead ends: 3068 [2022-11-22 02:03:16,334 INFO L226 Difference]: Without dead ends: 1692 [2022-11-22 02:03:16,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 81 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:03:16,349 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 88 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:16,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 71 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:03:16,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2022-11-22 02:03:16,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1218. [2022-11-22 02:03:16,500 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) [2022-11-22 02:03:16,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1568 transitions. [2022-11-22 02:03:16,508 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1568 transitions. Word has length 42 [2022-11-22 02:03:16,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:16,510 INFO L495 AbstractCegarLoop]: Abstraction has 1218 states and 1568 transitions. [2022-11-22 02:03:16,510 INFO L496 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) [2022-11-22 02:03:16,510 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1568 transitions. [2022-11-22 02:03:16,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-22 02:03:16,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:16,514 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-22 02:03:16,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:16,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:03:16,721 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:16,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:16,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1872551963, now seen corresponding path program 2 times [2022-11-22 02:03:16,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:16,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97513089] [2022-11-22 02:03:16,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:16,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:16,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:16,940 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:16,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:16,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97513089] [2022-11-22 02:03:16,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97513089] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:16,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359502746] [2022-11-22 02:03:16,942 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:16,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:16,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:16,955 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:17,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:03:17,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:03:17,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:17,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:03:17,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:17,131 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:17,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:17,402 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:17,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359502746] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:17,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1081766042] [2022-11-22 02:03:17,404 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-22 02:03:17,405 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:17,405 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:17,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:17,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2022-11-22 02:03:17,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133229360] [2022-11-22 02:03:17,406 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:17,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 02:03:17,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:17,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 02:03:17,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2022-11-22 02:03:17,407 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) [2022-11-22 02:03:18,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:18,484 INFO L93 Difference]: Finished difference Result 2184 states and 2971 transitions. [2022-11-22 02:03:18,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 02:03:18,485 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 [2022-11-22 02:03:18,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:18,497 INFO L225 Difference]: With dead ends: 2184 [2022-11-22 02:03:18,497 INFO L226 Difference]: Without dead ends: 2183 [2022-11-22 02:03:18,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:03:18,500 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 509 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 512 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:18,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [512 Valid, 412 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:03:18,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2022-11-22 02:03:18,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 1938. [2022-11-22 02:03:18,705 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) [2022-11-22 02:03:18,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2468 transitions. [2022-11-22 02:03:18,715 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2468 transitions. Word has length 43 [2022-11-22 02:03:18,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:18,715 INFO L495 AbstractCegarLoop]: Abstraction has 1938 states and 2468 transitions. [2022-11-22 02:03:18,716 INFO L496 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) [2022-11-22 02:03:18,716 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2468 transitions. [2022-11-22 02:03:18,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 02:03:18,718 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:18,718 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:18,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:18,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:03:18,925 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:18,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:18,926 INFO L85 PathProgramCache]: Analyzing trace with hash -112901947, now seen corresponding path program 2 times [2022-11-22 02:03:18,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:18,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393230872] [2022-11-22 02:03:18,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:18,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:18,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:19,106 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:03:19,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:19,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393230872] [2022-11-22 02:03:19,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [393230872] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:19,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240093523] [2022-11-22 02:03:19,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:19,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:19,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:19,109 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:19,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:03:19,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:03:19,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:19,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:03:19,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:03:19,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:20,047 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 19 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:03:20,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240093523] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:20,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [373725799] [2022-11-22 02:03:20,053 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:03:20,054 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:20,054 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:20,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:20,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 13] total 23 [2022-11-22 02:03:20,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046458178] [2022-11-22 02:03:20,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:20,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-22 02:03:20,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:20,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-22 02:03:20,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:03:20,059 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) [2022-11-22 02:03:21,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:21,425 INFO L93 Difference]: Finished difference Result 3169 states and 4414 transitions. [2022-11-22 02:03:21,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 02:03:21,426 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 [2022-11-22 02:03:21,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:21,435 INFO L225 Difference]: With dead ends: 3169 [2022-11-22 02:03:21,436 INFO L226 Difference]: Without dead ends: 1492 [2022-11-22 02:03:21,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=377, Invalid=1429, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:03:21,450 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 212 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:21,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 92 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:03:21,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2022-11-22 02:03:21,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1397. [2022-11-22 02:03:21,648 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) [2022-11-22 02:03:21,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1779 transitions. [2022-11-22 02:03:21,654 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1779 transitions. Word has length 44 [2022-11-22 02:03:21,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:21,655 INFO L495 AbstractCegarLoop]: Abstraction has 1397 states and 1779 transitions. [2022-11-22 02:03:21,655 INFO L496 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) [2022-11-22 02:03:21,655 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1779 transitions. [2022-11-22 02:03:21,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-22 02:03:21,657 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:21,658 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:21,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:21,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:03:21,864 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:21,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:21,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1647647435, now seen corresponding path program 1 times [2022-11-22 02:03:21,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:21,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636126178] [2022-11-22 02:03:21,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:21,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:21,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:22,125 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:03:22,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:22,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636126178] [2022-11-22 02:03:22,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636126178] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:22,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169950191] [2022-11-22 02:03:22,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:22,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:22,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:22,127 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:22,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:03:22,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:22,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-22 02:03:22,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:22,257 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:03:22,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:22,952 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:03:22,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169950191] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:22,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136978119] [2022-11-22 02:03:22,961 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:03:22,962 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:22,962 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:22,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:22,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2022-11-22 02:03:22,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873566692] [2022-11-22 02:03:22,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:22,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 02:03:22,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:22,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 02:03:22,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:03:22,968 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) [2022-11-22 02:03:26,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:26,137 INFO L93 Difference]: Finished difference Result 4226 states and 7033 transitions. [2022-11-22 02:03:26,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 02:03:26,138 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 [2022-11-22 02:03:26,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:26,178 INFO L225 Difference]: With dead ends: 4226 [2022-11-22 02:03:26,178 INFO L226 Difference]: Without dead ends: 4194 [2022-11-22 02:03:26,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2359 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1462, Invalid=6728, Unknown=0, NotChecked=0, Total=8190 [2022-11-22 02:03:26,184 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 215 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 871 mSolverCounterSat, 495 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 1366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 495 IncrementalHoareTripleChecker+Valid, 871 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:26,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 221 Invalid, 1366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [495 Valid, 871 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:03:26,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4194 states. [2022-11-22 02:03:26,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4194 to 3143. [2022-11-22 02:03:26,624 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) [2022-11-22 02:03:26,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3143 states to 3143 states and 5466 transitions. [2022-11-22 02:03:26,650 INFO L78 Accepts]: Start accepts. Automaton has 3143 states and 5466 transitions. Word has length 51 [2022-11-22 02:03:26,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:26,650 INFO L495 AbstractCegarLoop]: Abstraction has 3143 states and 5466 transitions. [2022-11-22 02:03:26,651 INFO L496 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) [2022-11-22 02:03:26,651 INFO L276 IsEmpty]: Start isEmpty. Operand 3143 states and 5466 transitions. [2022-11-22 02:03:26,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-22 02:03:26,652 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:26,653 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:26,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:26,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:26,863 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:26,864 INFO L85 PathProgramCache]: Analyzing trace with hash 397022168, now seen corresponding path program 1 times [2022-11-22 02:03:26,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:26,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620857316] [2022-11-22 02:03:26,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:26,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:26,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:27,136 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 54 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-22 02:03:27,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:27,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620857316] [2022-11-22 02:03:27,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620857316] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:27,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444173365] [2022-11-22 02:03:27,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:27,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:27,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:27,139 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:27,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:03:27,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:27,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-22 02:03:27,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:27,300 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 46 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-22 02:03:27,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:28,294 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 63 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-22 02:03:28,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444173365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:28,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [315812247] [2022-11-22 02:03:28,296 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:03:28,296 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:28,296 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:28,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:28,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2022-11-22 02:03:28,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762721798] [2022-11-22 02:03:28,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:28,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 02:03:28,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:28,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 02:03:28,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:03:28,298 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) [2022-11-22 02:03:29,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:29,950 INFO L93 Difference]: Finished difference Result 6291 states and 12447 transitions. [2022-11-22 02:03:29,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 02:03:29,951 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 [2022-11-22 02:03:29,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:29,990 INFO L225 Difference]: With dead ends: 6291 [2022-11-22 02:03:29,991 INFO L226 Difference]: Without dead ends: 3586 [2022-11-22 02:03:30,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=596, Invalid=2484, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 02:03:30,031 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 148 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:30,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 262 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:03:30,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3586 states. [2022-11-22 02:03:30,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3586 to 3481. [2022-11-22 02:03:30,495 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) [2022-11-22 02:03:30,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3481 states to 3481 states and 5298 transitions. [2022-11-22 02:03:30,519 INFO L78 Accepts]: Start accepts. Automaton has 3481 states and 5298 transitions. Word has length 72 [2022-11-22 02:03:30,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:30,519 INFO L495 AbstractCegarLoop]: Abstraction has 3481 states and 5298 transitions. [2022-11-22 02:03:30,520 INFO L496 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) [2022-11-22 02:03:30,521 INFO L276 IsEmpty]: Start isEmpty. Operand 3481 states and 5298 transitions. [2022-11-22 02:03:30,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 02:03:30,523 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:30,523 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-22 02:03:30,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:30,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:30,729 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:30,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:30,729 INFO L85 PathProgramCache]: Analyzing trace with hash 379467222, now seen corresponding path program 2 times [2022-11-22 02:03:30,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:30,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437549206] [2022-11-22 02:03:30,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:30,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:30,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:30,846 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 75 proven. 31 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-22 02:03:30,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:30,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437549206] [2022-11-22 02:03:30,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437549206] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:30,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562915375] [2022-11-22 02:03:30,847 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:30,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:30,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:30,848 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:30,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:03:30,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 02:03:30,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:30,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:03:30,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:31,208 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 28 proven. 48 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2022-11-22 02:03:31,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:33,135 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2022-11-22 02:03:33,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562915375] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:33,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705891715] [2022-11-22 02:03:33,137 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:03:33,138 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:33,138 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:33,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:33,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2022-11-22 02:03:33,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12844006] [2022-11-22 02:03:33,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:33,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 02:03:33,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:33,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 02:03:33,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:03:33,140 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) [2022-11-22 02:03:43,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:43,691 INFO L93 Difference]: Finished difference Result 17825 states and 38704 transitions. [2022-11-22 02:03:43,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2022-11-22 02:03:43,691 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 28 states have internal predecessors, (93), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) Word has length 79 [2022-11-22 02:03:43,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:43,811 INFO L225 Difference]: With dead ends: 17825 [2022-11-22 02:03:43,811 INFO L226 Difference]: Without dead ends: 14316 [2022-11-22 02:03:43,870 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15308 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6608, Invalid=36448, Unknown=0, NotChecked=0, Total=43056 [2022-11-22 02:03:43,870 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 432 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 2716 mSolverCounterSat, 1335 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 4051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1335 IncrementalHoareTripleChecker+Valid, 2716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:43,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 353 Invalid, 4051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1335 Valid, 2716 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-22 02:03:43,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14316 states. [2022-11-22 02:03:45,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14316 to 7630. [2022-11-22 02:03:45,326 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) [2022-11-22 02:03:45,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7630 states to 7630 states and 14701 transitions. [2022-11-22 02:03:45,390 INFO L78 Accepts]: Start accepts. Automaton has 7630 states and 14701 transitions. Word has length 79 [2022-11-22 02:03:45,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:45,390 INFO L495 AbstractCegarLoop]: Abstraction has 7630 states and 14701 transitions. [2022-11-22 02:03:45,391 INFO L496 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) [2022-11-22 02:03:45,391 INFO L276 IsEmpty]: Start isEmpty. Operand 7630 states and 14701 transitions. [2022-11-22 02:03:45,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-22 02:03:45,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:45,393 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:03:45,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:45,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-22 02:03:45,599 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:45,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:45,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1101938774, now seen corresponding path program 2 times [2022-11-22 02:03:45,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:45,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514764063] [2022-11-22 02:03:45,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:45,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:45,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:46,054 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 93 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-22 02:03:46,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:46,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514764063] [2022-11-22 02:03:46,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514764063] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:46,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485915325] [2022-11-22 02:03:46,055 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:46,055 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:46,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:46,056 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:46,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:03:46,170 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 02:03:46,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:46,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-22 02:03:46,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:46,251 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 85 proven. 40 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:03:46,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:47,236 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 105 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-22 02:03:47,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485915325] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:47,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [538031662] [2022-11-22 02:03:47,238 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:03:47,239 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:47,239 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:47,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:47,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2022-11-22 02:03:47,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581758205] [2022-11-22 02:03:47,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:47,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 02:03:47,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:47,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 02:03:47,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:03:47,242 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) [2022-11-22 02:03:50,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:50,431 INFO L93 Difference]: Finished difference Result 14577 states and 29711 transitions. [2022-11-22 02:03:50,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-22 02:03:50,432 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 [2022-11-22 02:03:50,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:50,490 INFO L225 Difference]: With dead ends: 14577 [2022-11-22 02:03:50,490 INFO L226 Difference]: Without dead ends: 7325 [2022-11-22 02:03:50,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1638, Invalid=6734, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 02:03:50,595 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 256 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 906 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 1245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 906 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:50,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 296 Invalid, 1245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [339 Valid, 906 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:03:50,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7325 states. [2022-11-22 02:03:51,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7325 to 6147. [2022-11-22 02:03:51,474 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) [2022-11-22 02:03:51,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6147 states to 6147 states and 8996 transitions. [2022-11-22 02:03:51,502 INFO L78 Accepts]: Start accepts. Automaton has 6147 states and 8996 transitions. Word has length 80 [2022-11-22 02:03:51,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:51,503 INFO L495 AbstractCegarLoop]: Abstraction has 6147 states and 8996 transitions. [2022-11-22 02:03:51,503 INFO L496 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) [2022-11-22 02:03:51,503 INFO L276 IsEmpty]: Start isEmpty. Operand 6147 states and 8996 transitions. [2022-11-22 02:03:51,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-22 02:03:51,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:51,513 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-22 02:03:51,528 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-22 02:03:51,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-22 02:03:51,719 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:51,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:51,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1394163817, now seen corresponding path program 3 times [2022-11-22 02:03:51,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:51,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055024466] [2022-11-22 02:03:51,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:51,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:51,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:52,229 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:52,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:52,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055024466] [2022-11-22 02:03:52,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055024466] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:52,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550166932] [2022-11-22 02:03:52,230 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:03:52,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:52,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:52,243 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:52,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:03:52,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:03:52,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:52,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:03:52,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:52,537 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:52,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:53,248 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:53,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550166932] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:53,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737950489] [2022-11-22 02:03:53,250 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-22 02:03:53,250 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:53,250 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:53,250 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:53,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-11-22 02:03:53,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082816133] [2022-11-22 02:03:53,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:53,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:03:53,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:53,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:03:53,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:03:53,253 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) [2022-11-22 02:03:55,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:55,495 INFO L93 Difference]: Finished difference Result 9752 states and 13964 transitions. [2022-11-22 02:03:55,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-22 02:03:55,495 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 [2022-11-22 02:03:55,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:55,534 INFO L225 Difference]: With dead ends: 9752 [2022-11-22 02:03:55,535 INFO L226 Difference]: Without dead ends: 9751 [2022-11-22 02:03:55,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2022-11-22 02:03:55,540 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 888 mSDsluCounter, 690 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 506 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 892 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 1458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 506 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:55,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [892 Valid, 755 Invalid, 1458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [506 Valid, 952 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:03:55,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9751 states. [2022-11-22 02:03:56,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9751 to 9411. [2022-11-22 02:03:56,635 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) [2022-11-22 02:03:56,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9411 states to 9411 states and 13604 transitions. [2022-11-22 02:03:56,689 INFO L78 Accepts]: Start accepts. Automaton has 9411 states and 13604 transitions. Word has length 91 [2022-11-22 02:03:56,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:56,690 INFO L495 AbstractCegarLoop]: Abstraction has 9411 states and 13604 transitions. [2022-11-22 02:03:56,690 INFO L496 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) [2022-11-22 02:03:56,691 INFO L276 IsEmpty]: Start isEmpty. Operand 9411 states and 13604 transitions. [2022-11-22 02:03:56,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-22 02:03:56,697 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:56,697 INFO L195 NwaCegarLoop]: trace histogram [13, 10, 8, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2022-11-22 02:03:56,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:56,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:56,904 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:03:56,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:56,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1228110289, now seen corresponding path program 3 times [2022-11-22 02:03:56,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:56,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662630494] [2022-11-22 02:03:56,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:56,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:56,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:57,119 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 174 proven. 52 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2022-11-22 02:03:57,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:57,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662630494] [2022-11-22 02:03:57,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662630494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:57,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405695690] [2022-11-22 02:03:57,120 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:03:57,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:57,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:57,123 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:57,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:03:57,261 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:03:57,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:57,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:03:57,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:57,333 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 199 proven. 26 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-22 02:03:57,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:58,377 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 164 proven. 59 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-11-22 02:03:58,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405695690] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:58,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576291148] [2022-11-22 02:03:58,379 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:03:58,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:58,380 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:03:58,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:58,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 15 [2022-11-22 02:03:58,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268551485] [2022-11-22 02:03:58,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:58,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-22 02:03:58,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:58,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-22 02:03:58,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:03:58,382 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) [2022-11-22 02:03:59,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:59,495 INFO L93 Difference]: Finished difference Result 19790 states and 40674 transitions. [2022-11-22 02:03:59,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 02:03:59,496 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 115 [2022-11-22 02:03:59,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:59,585 INFO L225 Difference]: With dead ends: 19790 [2022-11-22 02:03:59,585 INFO L226 Difference]: Without dead ends: 12059 [2022-11-22 02:03:59,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=295, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:03:59,666 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 110 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:59,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 157 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:59,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12059 states. [2022-11-22 02:04:00,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12059 to 9900. [2022-11-22 02:04:01,013 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) [2022-11-22 02:04:01,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14245 transitions. [2022-11-22 02:04:01,063 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14245 transitions. Word has length 115 [2022-11-22 02:04:01,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:01,064 INFO L495 AbstractCegarLoop]: Abstraction has 9900 states and 14245 transitions. [2022-11-22 02:04:01,064 INFO L496 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) [2022-11-22 02:04:01,064 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14245 transitions. [2022-11-22 02:04:01,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-22 02:04:01,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:01,071 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:04:01,078 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-22 02:04:01,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:04:01,277 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:04:01,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:01,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1912996866, now seen corresponding path program 3 times [2022-11-22 02:04:01,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:01,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347755959] [2022-11-22 02:04:01,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:01,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:01,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:01,923 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 189 proven. 185 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-22 02:04:01,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:01,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347755959] [2022-11-22 02:04:01,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347755959] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:01,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930321587] [2022-11-22 02:04:01,924 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:04:01,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:01,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:01,925 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:01,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:04:02,079 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:04:02,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:04:02,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 02:04:02,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:02,210 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 181 proven. 188 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:04:02,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:03,614 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 201 proven. 173 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-22 02:04:03,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930321587] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:03,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114036470] [2022-11-22 02:04:03,616 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:04:03,616 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:03,617 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:04:03,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:03,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2022-11-22 02:04:03,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658003439] [2022-11-22 02:04:03,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:03,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 02:04:03,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:03,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 02:04:03,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:04:03,620 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) [2022-11-22 02:04:06,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:06,681 INFO L93 Difference]: Finished difference Result 10597 states and 15041 transitions. [2022-11-22 02:04:06,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-22 02:04:06,682 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 [2022-11-22 02:04:06,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:06,747 INFO L225 Difference]: With dead ends: 10597 [2022-11-22 02:04:06,747 INFO L226 Difference]: Without dead ends: 10596 [2022-11-22 02:04:06,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1832 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1852, Invalid=6520, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 02:04:06,758 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 327 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 1105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:06,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [327 Valid, 293 Invalid, 1105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 816 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:04:06,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10596 states. [2022-11-22 02:04:07,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10596 to 9900. [2022-11-22 02:04:07,942 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) [2022-11-22 02:04:07,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9900 states to 9900 states and 14230 transitions. [2022-11-22 02:04:07,992 INFO L78 Accepts]: Start accepts. Automaton has 9900 states and 14230 transitions. Word has length 112 [2022-11-22 02:04:07,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:07,993 INFO L495 AbstractCegarLoop]: Abstraction has 9900 states and 14230 transitions. [2022-11-22 02:04:07,993 INFO L496 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) [2022-11-22 02:04:07,994 INFO L276 IsEmpty]: Start isEmpty. Operand 9900 states and 14230 transitions. [2022-11-22 02:04:08,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-22 02:04:08,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:08,004 INFO L195 NwaCegarLoop]: 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] [2022-11-22 02:04:08,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-22 02:04:08,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:08,211 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:04:08,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:08,211 INFO L85 PathProgramCache]: Analyzing trace with hash 806548701, now seen corresponding path program 4 times [2022-11-22 02:04:08,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:08,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490212804] [2022-11-22 02:04:08,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:08,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:08,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:08,955 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 167 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2022-11-22 02:04:08,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:08,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490212804] [2022-11-22 02:04:08,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490212804] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:08,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877278897] [2022-11-22 02:04:08,956 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:04:08,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:08,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:08,957 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:08,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:04:09,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:09,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-22 02:04:09,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:09,266 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 62 proven. 154 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2022-11-22 02:04:09,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:14,195 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 74 proven. 217 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2022-11-22 02:04:14,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877278897] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:14,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470008335] [2022-11-22 02:04:14,197 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:04:14,197 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:14,198 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:04:14,198 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:14,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2022-11-22 02:04:14,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104125434] [2022-11-22 02:04:14,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:14,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 02:04:14,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:14,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 02:04:14,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:04:14,200 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) [2022-11-22 02:04:35,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:35,987 INFO L93 Difference]: Finished difference Result 70704 states and 137719 transitions. [2022-11-22 02:04:35,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2022-11-22 02:04:35,988 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 [2022-11-22 02:04:35,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:36,961 INFO L225 Difference]: With dead ends: 70704 [2022-11-22 02:04:36,961 INFO L226 Difference]: Without dead ends: 69682 [2022-11-22 02:04:37,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69372 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=25686, Invalid=135516, Unknown=0, NotChecked=0, Total=161202 [2022-11-22 02:04:37,064 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 305 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 2443 mSolverCounterSat, 2149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 4592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2149 IncrementalHoareTripleChecker+Valid, 2443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:37,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [305 Valid, 359 Invalid, 4592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2149 Valid, 2443 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-22 02:04:37,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69682 states. [2022-11-22 02:04:41,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69682 to 17261. [2022-11-22 02:04:41,369 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) [2022-11-22 02:04:41,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17261 states to 17261 states and 28564 transitions. [2022-11-22 02:04:41,472 INFO L78 Accepts]: Start accepts. Automaton has 17261 states and 28564 transitions. Word has length 127 [2022-11-22 02:04:41,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:41,472 INFO L495 AbstractCegarLoop]: Abstraction has 17261 states and 28564 transitions. [2022-11-22 02:04:41,473 INFO L496 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) [2022-11-22 02:04:41,473 INFO L276 IsEmpty]: Start isEmpty. Operand 17261 states and 28564 transitions. [2022-11-22 02:04:41,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-11-22 02:04:41,497 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:41,497 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-22 02:04:41,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:41,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-22 02:04:41,703 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:04:41,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:41,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1011893903, now seen corresponding path program 4 times [2022-11-22 02:04:41,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:41,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986272968] [2022-11-22 02:04:41,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:41,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:41,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:43,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:43,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:43,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986272968] [2022-11-22 02:04:43,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986272968] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:43,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527027317] [2022-11-22 02:04:43,549 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:04:43,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:43,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:43,551 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:43,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:04:43,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:43,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:04:43,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:44,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:44,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:46,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:46,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527027317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:46,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1612232486] [2022-11-22 02:04:46,232 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-22 02:04:46,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:46,233 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:04:46,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:46,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2022-11-22 02:04:46,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829894717] [2022-11-22 02:04:46,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:46,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-11-22 02:04:46,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:46,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-11-22 02:04:46,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2022-11-22 02:04:46,238 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) [2022-11-22 02:04:53,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:53,743 INFO L93 Difference]: Finished difference Result 28594 states and 45424 transitions. [2022-11-22 02:04:53,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2022-11-22 02:04:53,744 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 [2022-11-22 02:04:53,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:53,912 INFO L225 Difference]: With dead ends: 28594 [2022-11-22 02:04:53,913 INFO L226 Difference]: Without dead ends: 28593 [2022-11-22 02:04:53,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 326 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8376 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=10814, Invalid=23968, Unknown=0, NotChecked=0, Total=34782 [2022-11-22 02:04:53,931 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 2601 mSDsluCounter, 1085 mSDsCounter, 0 mSdLazyCounter, 1867 mSolverCounterSat, 1357 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2605 SdHoareTripleChecker+Valid, 1196 SdHoareTripleChecker+Invalid, 3224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1357 IncrementalHoareTripleChecker+Valid, 1867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:53,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2605 Valid, 1196 Invalid, 3224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1357 Valid, 1867 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-22 02:04:53,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28593 states. [2022-11-22 02:04:56,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28593 to 27869. [2022-11-22 02:04:56,981 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) [2022-11-22 02:04:57,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27869 states to 27869 states and 44668 transitions. [2022-11-22 02:04:57,086 INFO L78 Accepts]: Start accepts. Automaton has 27869 states and 44668 transitions. Word has length 187 [2022-11-22 02:04:57,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:57,086 INFO L495 AbstractCegarLoop]: Abstraction has 27869 states and 44668 transitions. [2022-11-22 02:04:57,087 INFO L496 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) [2022-11-22 02:04:57,087 INFO L276 IsEmpty]: Start isEmpty. Operand 27869 states and 44668 transitions. [2022-11-22 02:04:57,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2022-11-22 02:04:57,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:57,126 INFO L195 NwaCegarLoop]: trace histogram [25, 21, 16, 12, 12, 12, 11, 11, 11, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-22 02:04:57,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:57,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 02:04:57,340 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-22 02:04:57,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:57,341 INFO L85 PathProgramCache]: Analyzing trace with hash -103255699, now seen corresponding path program 1 times [2022-11-22 02:04:57,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:57,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716413314] [2022-11-22 02:04:57,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:57,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:57,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:58,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1644 backedges. 449 proven. 278 refuted. 0 times theorem prover too weak. 917 trivial. 0 not checked. [2022-11-22 02:04:58,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:58,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716413314] [2022-11-22 02:04:58,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716413314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:58,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307162188] [2022-11-22 02:04:58,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:58,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:58,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:58,978 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:58,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ced38b8-33bb-48b2-9254-68aa34d36bd3/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:04:59,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:59,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 02:04:59,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:59,567 INFO L134 CoverageAnalysis]: Checked inductivity of 1644 backedges. 628 proven. 324 refuted. 0 times theorem prover too weak. 692 trivial. 0 not checked. [2022-11-22 02:04:59,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:04,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1644 backedges. 651 proven. 436 refuted. 0 times theorem prover too weak. 557 trivial. 0 not checked. [2022-11-22 02:05:04,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307162188] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:04,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502860186] [2022-11-22 02:05:04,068 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:05:04,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:04,068 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-22 02:05:04,069 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:04,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2022-11-22 02:05:04,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58822435] [2022-11-22 02:05:04,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:04,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:05:04,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:04,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:05:04,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:05:04,073 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)