./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/recHanoi01.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/recHanoi01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 85b02fad28964214b0cd332ac12fce3136c6c5e9247130ab67f1c2c3baea22f9 --- 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-5e519f3 [2022-11-03 04:00:08,673 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 04:00:08,675 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 04:00:08,718 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 04:00:08,719 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 04:00:08,723 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 04:00:08,725 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 04:00:08,729 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 04:00:08,731 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 04:00:08,736 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 04:00:08,740 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 04:00:08,741 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 04:00:08,742 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 04:00:08,745 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 04:00:08,746 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 04:00:08,748 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 04:00:08,749 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 04:00:08,750 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 04:00:08,752 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 04:00:08,757 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 04:00:08,761 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 04:00:08,763 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 04:00:08,765 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 04:00:08,766 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 04:00:08,769 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 04:00:08,769 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 04:00:08,770 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 04:00:08,771 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 04:00:08,771 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 04:00:08,772 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 04:00:08,772 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 04:00:08,773 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 04:00:08,774 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 04:00:08,774 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 04:00:08,775 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 04:00:08,776 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 04:00:08,776 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 04:00:08,777 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 04:00:08,777 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 04:00:08,778 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 04:00:08,778 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 04:00:08,783 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 04:00:08,822 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 04:00:08,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 04:00:08,822 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 04:00:08,823 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 04:00:08,823 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 04:00:08,824 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 04:00:08,824 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 04:00:08,824 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 04:00:08,824 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 04:00:08,824 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 04:00:08,825 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 04:00:08,825 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 04:00:08,825 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 04:00:08,825 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 04:00:08,826 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 04:00:08,826 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 04:00:08,826 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 04:00:08,826 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 04:00:08,827 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 04:00:08,827 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 04:00:08,827 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 04:00:08,828 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 04:00:08,828 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 04:00:08,828 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 04:00:08,828 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 04:00:08,829 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 04:00:08,829 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 04:00:08,829 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 04:00:08,829 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 04:00:08,829 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 04:00:08,830 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 04:00:08,830 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 04:00:08,830 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:00:08,830 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 04:00:08,831 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 04:00:08,831 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 04:00:08,831 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 04:00:08,831 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 04:00:08,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 04:00:08,832 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 04:00:08,832 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 04:00:08,832 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_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85b02fad28964214b0cd332ac12fce3136c6c5e9247130ab67f1c2c3baea22f9 [2022-11-03 04:00:09,117 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 04:00:09,150 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 04:00:09,153 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 04:00:09,154 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 04:00:09,155 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 04:00:09,157 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/recursive/recHanoi01.c [2022-11-03 04:00:09,225 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/data/bd146b943/e47d679e9a604df980e28ef8d1a7b8c9/FLAG19c794afa [2022-11-03 04:00:09,711 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 04:00:09,712 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/sv-benchmarks/c/recursive/recHanoi01.c [2022-11-03 04:00:09,734 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/data/bd146b943/e47d679e9a604df980e28ef8d1a7b8c9/FLAG19c794afa [2022-11-03 04:00:10,192 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/data/bd146b943/e47d679e9a604df980e28ef8d1a7b8c9 [2022-11-03 04:00:10,196 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 04:00:10,198 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 04:00:10,203 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 04:00:10,204 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 04:00:10,213 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 04:00:10,214 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,216 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b336358 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10, skipping insertion in model container [2022-11-03 04:00:10,216 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,225 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 04:00:10,239 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 04:00:10,444 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/sv-benchmarks/c/recursive/recHanoi01.c[1213,1226] [2022-11-03 04:00:10,446 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:00:10,456 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 04:00:10,470 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/sv-benchmarks/c/recursive/recHanoi01.c[1213,1226] [2022-11-03 04:00:10,471 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:00:10,486 INFO L208 MainTranslator]: Completed translation [2022-11-03 04:00:10,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10 WrapperNode [2022-11-03 04:00:10,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 04:00:10,488 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 04:00:10,488 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 04:00:10,488 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 04:00:10,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,504 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,521 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2022-11-03 04:00:10,521 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 04:00:10,522 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 04:00:10,522 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 04:00:10,523 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 04:00:10,532 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,532 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,534 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,535 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,543 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,546 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,549 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,550 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,551 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 04:00:10,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 04:00:10,553 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 04:00:10,553 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 04:00:10,554 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (1/1) ... [2022-11-03 04:00:10,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:00:10,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:10,584 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 04:00:10,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 04:00:10,626 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 04:00:10,626 INFO L130 BoogieDeclarations]: Found specification of procedure applyHanoi [2022-11-03 04:00:10,626 INFO L138 BoogieDeclarations]: Found implementation of procedure applyHanoi [2022-11-03 04:00:10,626 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2022-11-03 04:00:10,627 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2022-11-03 04:00:10,627 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 04:00:10,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 04:00:10,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 04:00:10,706 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 04:00:10,710 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 04:00:10,916 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 04:00:10,930 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 04:00:10,942 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-03 04:00:10,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:00:10 BoogieIcfgContainer [2022-11-03 04:00:10,945 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 04:00:10,963 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 04:00:10,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 04:00:10,967 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 04:00:10,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:00:10" (1/3) ... [2022-11-03 04:00:10,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa19d4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:00:10, skipping insertion in model container [2022-11-03 04:00:10,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:00:10" (2/3) ... [2022-11-03 04:00:10,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa19d4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:00:10, skipping insertion in model container [2022-11-03 04:00:10,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:00:10" (3/3) ... [2022-11-03 04:00:10,970 INFO L112 eAbstractionObserver]: Analyzing ICFG recHanoi01.c [2022-11-03 04:00:10,987 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 04:00:10,988 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 04:00:11,035 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 04:00:11,042 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;@5529e9f7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 04:00:11,042 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 04:00:11,046 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 04:00:11,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 04:00:11,056 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:11,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:11,057 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:11,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:11,063 INFO L85 PathProgramCache]: Analyzing trace with hash -432663240, now seen corresponding path program 1 times [2022-11-03 04:00:11,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:11,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759992522] [2022-11-03 04:00:11,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:11,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:11,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:11,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:00:11,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:11,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759992522] [2022-11-03 04:00:11,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759992522] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:00:11,381 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:00:11,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 04:00:11,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983411664] [2022-11-03 04:00:11,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:00:11,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 04:00:11,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:11,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 04:00:11,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 04:00:11,434 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 04:00:11,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:11,516 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2022-11-03 04:00:11,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 04:00:11,519 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-03 04:00:11,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:11,527 INFO L225 Difference]: With dead ends: 39 [2022-11-03 04:00:11,530 INFO L226 Difference]: Without dead ends: 22 [2022-11-03 04:00:11,533 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 [2022-11-03 04:00:11,537 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 9 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:11,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 58 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:00:11,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-03 04:00:11,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-03 04:00:11,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-03 04:00:11,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-03 04:00:11,597 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2022-11-03 04:00:11,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:11,599 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-03 04:00:11,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 04:00:11,600 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-03 04:00:11,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 04:00:11,603 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:11,603 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:11,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 04:00:11,604 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:11,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:11,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1422071395, now seen corresponding path program 1 times [2022-11-03 04:00:11,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:11,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610528815] [2022-11-03 04:00:11,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:11,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:11,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:12,102 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 04:00:12,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:12,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610528815] [2022-11-03 04:00:12,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610528815] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:12,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951859853] [2022-11-03 04:00:12,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:12,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:12,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:12,108 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:12,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 04:00:12,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:12,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 04:00:12,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:12,423 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 04:00:12,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:12,744 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 04:00:12,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951859853] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:12,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [437400822] [2022-11-03 04:00:12,783 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 04:00:12,783 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:12,788 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) [2022-11-03 04:00:12,791 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:12,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 10] total 17 [2022-11-03 04:00:12,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560307207] [2022-11-03 04:00:12,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:12,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 04:00:12,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:12,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 04:00:12,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:00:12,804 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2022-11-03 04:00:13,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:13,369 INFO L93 Difference]: Finished difference Result 73 states and 103 transitions. [2022-11-03 04:00:13,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 04:00:13,370 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 25 [2022-11-03 04:00:13,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:13,372 INFO L225 Difference]: With dead ends: 73 [2022-11-03 04:00:13,373 INFO L226 Difference]: Without dead ends: 67 [2022-11-03 04:00:13,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2022-11-03 04:00:13,375 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 66 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:13,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 116 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 04:00:13,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-03 04:00:13,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 56. [2022-11-03 04:00:13,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 33 states have internal predecessors, (35), 14 states have call successors, (14), 6 states have call predecessors, (14), 11 states have return successors, (33), 16 states have call predecessors, (33), 14 states have call successors, (33) [2022-11-03 04:00:13,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 82 transitions. [2022-11-03 04:00:13,397 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 82 transitions. Word has length 25 [2022-11-03 04:00:13,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:13,397 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 82 transitions. [2022-11-03 04:00:13,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2022-11-03 04:00:13,398 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 82 transitions. [2022-11-03 04:00:13,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 04:00:13,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:13,400 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:13,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:13,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:13,624 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:13,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:13,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1071008002, now seen corresponding path program 2 times [2022-11-03 04:00:13,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:13,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99411491] [2022-11-03 04:00:13,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:13,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:13,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:13,778 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 04:00:13,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:13,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99411491] [2022-11-03 04:00:13,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99411491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:13,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134197760] [2022-11-03 04:00:13,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:00:13,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:13,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:13,781 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:13,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 04:00:13,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 04:00:13,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:13,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 04:00:13,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:13,952 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 04:00:13,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:14,371 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 8 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 04:00:14,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134197760] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:14,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821203729] [2022-11-03 04:00:14,379 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 04:00:14,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:14,379 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) [2022-11-03 04:00:14,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:14,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 16 [2022-11-03 04:00:14,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722078717] [2022-11-03 04:00:14,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:14,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 04:00:14,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:14,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 04:00:14,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2022-11-03 04:00:14,382 INFO L87 Difference]: Start difference. First operand 56 states and 82 transitions. Second operand has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2022-11-03 04:00:14,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:14,713 INFO L93 Difference]: Finished difference Result 107 states and 168 transitions. [2022-11-03 04:00:14,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 04:00:14,714 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) Word has length 35 [2022-11-03 04:00:14,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:14,716 INFO L225 Difference]: With dead ends: 107 [2022-11-03 04:00:14,716 INFO L226 Difference]: Without dead ends: 73 [2022-11-03 04:00:14,717 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 60 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=432, Unknown=0, NotChecked=0, Total=552 [2022-11-03 04:00:14,718 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 37 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:14,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 141 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:00:14,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-03 04:00:14,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 54. [2022-11-03 04:00:14,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 33 states have (on average 1.121212121212121) internal successors, (37), 32 states have internal predecessors, (37), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (20), 12 states have call predecessors, (20), 11 states have call successors, (20) [2022-11-03 04:00:14,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2022-11-03 04:00:14,748 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 35 [2022-11-03 04:00:14,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:14,748 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2022-11-03 04:00:14,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2022-11-03 04:00:14,749 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2022-11-03 04:00:14,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 04:00:14,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:14,759 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:14,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:14,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:14,960 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:14,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:14,960 INFO L85 PathProgramCache]: Analyzing trace with hash -877477481, now seen corresponding path program 1 times [2022-11-03 04:00:14,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:14,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953416053] [2022-11-03 04:00:14,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:14,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:14,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:15,078 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 04:00:15,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:15,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953416053] [2022-11-03 04:00:15,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953416053] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:15,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749126876] [2022-11-03 04:00:15,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:15,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:15,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:15,081 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:15,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 04:00:15,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:15,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 04:00:15,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:15,202 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 04:00:15,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:15,475 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 04:00:15,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749126876] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:15,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [782544465] [2022-11-03 04:00:15,482 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:15,482 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:15,483 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) [2022-11-03 04:00:15,484 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:15,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 13 [2022-11-03 04:00:15,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085075201] [2022-11-03 04:00:15,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:15,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 04:00:15,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:15,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 04:00:15,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-11-03 04:00:15,491 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 04:00:15,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:15,634 INFO L93 Difference]: Finished difference Result 61 states and 75 transitions. [2022-11-03 04:00:15,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 04:00:15,636 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) Word has length 31 [2022-11-03 04:00:15,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:15,648 INFO L225 Difference]: With dead ends: 61 [2022-11-03 04:00:15,648 INFO L226 Difference]: Without dead ends: 49 [2022-11-03 04:00:15,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:00:15,651 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 21 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:15,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 72 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:00:15,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-03 04:00:15,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2022-11-03 04:00:15,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (17), 10 states have call predecessors, (17), 10 states have call successors, (17) [2022-11-03 04:00:15,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2022-11-03 04:00:15,675 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 31 [2022-11-03 04:00:15,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:15,675 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2022-11-03 04:00:15,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 04:00:15,676 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2022-11-03 04:00:15,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 04:00:15,679 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:15,679 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:15,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:15,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:15,895 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:15,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:15,895 INFO L85 PathProgramCache]: Analyzing trace with hash -921128009, now seen corresponding path program 2 times [2022-11-03 04:00:15,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:15,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878037370] [2022-11-03 04:00:15,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:15,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:15,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:16,517 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-03 04:00:16,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:16,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878037370] [2022-11-03 04:00:16,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878037370] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:16,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596745155] [2022-11-03 04:00:16,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:00:16,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:16,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:16,519 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:16,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 04:00:16,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 04:00:16,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:16,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 04:00:16,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:16,909 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-03 04:00:16,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:17,748 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 04:00:17,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596745155] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:17,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1286406151] [2022-11-03 04:00:17,753 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:17,753 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:17,754 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) [2022-11-03 04:00:17,755 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:17,755 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 18] total 32 [2022-11-03 04:00:17,755 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933828870] [2022-11-03 04:00:17,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:17,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 04:00:17,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:17,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 04:00:17,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2022-11-03 04:00:17,759 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-03 04:00:19,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:19,393 INFO L93 Difference]: Finished difference Result 100 states and 138 transitions. [2022-11-03 04:00:19,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-03 04:00:19,394 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) Word has length 51 [2022-11-03 04:00:19,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:19,397 INFO L225 Difference]: With dead ends: 100 [2022-11-03 04:00:19,397 INFO L226 Difference]: Without dead ends: 96 [2022-11-03 04:00:19,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 86 SyntacticMatches, 10 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=418, Invalid=2552, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 04:00:19,400 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 134 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 1005 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 1261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 1005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:19,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 170 Invalid, 1261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 1005 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 04:00:19,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-03 04:00:19,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 79. [2022-11-03 04:00:19,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 18 states have call successors, (18), 10 states have call predecessors, (18), 16 states have return successors, (44), 24 states have call predecessors, (44), 18 states have call successors, (44) [2022-11-03 04:00:19,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 110 transitions. [2022-11-03 04:00:19,439 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 110 transitions. Word has length 51 [2022-11-03 04:00:19,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:19,442 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 110 transitions. [2022-11-03 04:00:19,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-03 04:00:19,442 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 110 transitions. [2022-11-03 04:00:19,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-03 04:00:19,445 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:19,448 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:19,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:19,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:19,648 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:19,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:19,649 INFO L85 PathProgramCache]: Analyzing trace with hash -1011273987, now seen corresponding path program 3 times [2022-11-03 04:00:19,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:19,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744156560] [2022-11-03 04:00:19,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:19,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:19,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:19,833 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-03 04:00:19,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:19,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744156560] [2022-11-03 04:00:19,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744156560] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:19,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025059841] [2022-11-03 04:00:19,834 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:00:19,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:19,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:19,835 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:19,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 04:00:19,923 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:00:19,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:19,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 04:00:19,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-03 04:00:19,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:20,631 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 04:00:20,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025059841] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:20,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [360284405] [2022-11-03 04:00:20,635 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:20,635 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:20,636 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) [2022-11-03 04:00:20,637 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:20,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 17 [2022-11-03 04:00:20,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153719365] [2022-11-03 04:00:20,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:20,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 04:00:20,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:20,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 04:00:20,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:00:20,640 INFO L87 Difference]: Start difference. First operand 79 states and 110 transitions. Second operand has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2022-11-03 04:00:20,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:20,905 INFO L93 Difference]: Finished difference Result 98 states and 142 transitions. [2022-11-03 04:00:20,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 04:00:20,906 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) Word has length 57 [2022-11-03 04:00:20,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:20,908 INFO L225 Difference]: With dead ends: 98 [2022-11-03 04:00:20,908 INFO L226 Difference]: Without dead ends: 80 [2022-11-03 04:00:20,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2022-11-03 04:00:20,910 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:20,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 112 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:00:20,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-03 04:00:20,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2022-11-03 04:00:20,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 17 states have call successors, (17), 9 states have call predecessors, (17), 14 states have return successors, (42), 23 states have call predecessors, (42), 17 states have call successors, (42) [2022-11-03 04:00:20,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 101 transitions. [2022-11-03 04:00:20,930 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 101 transitions. Word has length 57 [2022-11-03 04:00:20,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:20,930 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 101 transitions. [2022-11-03 04:00:20,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2022-11-03 04:00:20,931 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 101 transitions. [2022-11-03 04:00:20,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-03 04:00:20,933 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:20,933 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:20,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:21,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:21,159 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:21,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:21,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1908192695, now seen corresponding path program 4 times [2022-11-03 04:00:21,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:21,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998830502] [2022-11-03 04:00:21,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:21,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:21,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:21,451 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 125 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2022-11-03 04:00:21,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:21,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998830502] [2022-11-03 04:00:21,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998830502] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:21,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71408966] [2022-11-03 04:00:21,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:00:21,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:21,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:21,454 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:21,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 04:00:21,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:21,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 04:00:21,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:21,633 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 125 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2022-11-03 04:00:21,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:22,438 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 135 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-03 04:00:22,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [71408966] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:22,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648160713] [2022-11-03 04:00:22,441 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:22,441 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:22,441 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) [2022-11-03 04:00:22,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:22,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 17 [2022-11-03 04:00:22,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122021644] [2022-11-03 04:00:22,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:22,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 04:00:22,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:22,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 04:00:22,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:00:22,444 INFO L87 Difference]: Start difference. First operand 71 states and 101 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-03 04:00:22,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:22,651 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2022-11-03 04:00:22,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 04:00:22,654 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) Word has length 91 [2022-11-03 04:00:22,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:22,655 INFO L225 Difference]: With dead ends: 80 [2022-11-03 04:00:22,656 INFO L226 Difference]: Without dead ends: 63 [2022-11-03 04:00:22,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=391, Unknown=0, NotChecked=0, Total=506 [2022-11-03 04:00:22,657 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:22,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 90 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:00:22,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-03 04:00:22,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2022-11-03 04:00:22,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 14 states have call successors, (14), 7 states have call predecessors, (14), 10 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2022-11-03 04:00:22,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 79 transitions. [2022-11-03 04:00:22,680 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 79 transitions. Word has length 91 [2022-11-03 04:00:22,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:22,683 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 79 transitions. [2022-11-03 04:00:22,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-03 04:00:22,683 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 79 transitions. [2022-11-03 04:00:22,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-11-03 04:00:22,686 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:22,687 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:22,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:22,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:22,911 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:22,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:22,911 INFO L85 PathProgramCache]: Analyzing trace with hash 768848125, now seen corresponding path program 5 times [2022-11-03 04:00:22,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:22,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791726509] [2022-11-03 04:00:22,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:22,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:22,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:24,072 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 34 proven. 161 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2022-11-03 04:00:24,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:24,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791726509] [2022-11-03 04:00:24,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791726509] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:24,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071639586] [2022-11-03 04:00:24,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:00:24,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:24,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:24,074 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:24,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 04:00:24,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 04:00:24,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:24,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-03 04:00:24,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:24,770 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-03 04:00:24,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:26,966 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-03 04:00:26,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071639586] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:26,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1261865402] [2022-11-03 04:00:26,968 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:26,969 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:26,969 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) [2022-11-03 04:00:26,970 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:26,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 32] total 51 [2022-11-03 04:00:26,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505042089] [2022-11-03 04:00:26,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:26,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-03 04:00:26,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:26,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-03 04:00:26,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 04:00:26,973 INFO L87 Difference]: Start difference. First operand 56 states and 79 transitions. Second operand has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) [2022-11-03 04:00:34,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:34,800 INFO L93 Difference]: Finished difference Result 203 states and 324 transitions. [2022-11-03 04:00:34,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-03 04:00:34,800 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) Word has length 97 [2022-11-03 04:00:34,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:34,803 INFO L225 Difference]: With dead ends: 203 [2022-11-03 04:00:34,803 INFO L226 Difference]: Without dead ends: 199 [2022-11-03 04:00:34,807 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 177 SyntacticMatches, 14 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3559 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1764, Invalid=11576, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 04:00:34,808 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 480 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 3406 mSolverCounterSat, 1400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 4806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1400 IncrementalHoareTripleChecker+Valid, 3406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:34,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 310 Invalid, 4806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1400 Valid, 3406 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-03 04:00:34,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-03 04:00:34,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 156. [2022-11-03 04:00:34,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 84 states have (on average 1.0833333333333333) internal successors, (91), 81 states have internal predecessors, (91), 37 states have call successors, (37), 20 states have call predecessors, (37), 34 states have return successors, (107), 54 states have call predecessors, (107), 37 states have call successors, (107) [2022-11-03 04:00:34,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 235 transitions. [2022-11-03 04:00:34,850 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 235 transitions. Word has length 97 [2022-11-03 04:00:34,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:34,851 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 235 transitions. [2022-11-03 04:00:34,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) [2022-11-03 04:00:34,851 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 235 transitions. [2022-11-03 04:00:34,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-03 04:00:34,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:34,854 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:34,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:35,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:35,063 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:35,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:35,063 INFO L85 PathProgramCache]: Analyzing trace with hash 489586039, now seen corresponding path program 6 times [2022-11-03 04:00:35,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:35,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542925238] [2022-11-03 04:00:35,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:35,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:35,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 138 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-11-03 04:00:35,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:35,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542925238] [2022-11-03 04:00:35,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542925238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:35,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959039154] [2022-11-03 04:00:35,378 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:00:35,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:35,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:35,380 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:35,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 04:00:35,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:00:35,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:35,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 04:00:35,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:35,593 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 138 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-11-03 04:00:35,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:36,703 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 156 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-11-03 04:00:36,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959039154] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:36,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043192904] [2022-11-03 04:00:36,705 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:36,706 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:36,706 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) [2022-11-03 04:00:36,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:36,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 21 [2022-11-03 04:00:36,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089321877] [2022-11-03 04:00:36,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:36,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-03 04:00:36,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:36,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-03 04:00:36,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-11-03 04:00:36,710 INFO L87 Difference]: Start difference. First operand 156 states and 235 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) [2022-11-03 04:00:37,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:37,036 INFO L93 Difference]: Finished difference Result 205 states and 381 transitions. [2022-11-03 04:00:37,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 04:00:37,037 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) Word has length 103 [2022-11-03 04:00:37,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:37,039 INFO L225 Difference]: With dead ends: 205 [2022-11-03 04:00:37,039 INFO L226 Difference]: Without dead ends: 184 [2022-11-03 04:00:37,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 195 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2022-11-03 04:00:37,041 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:37,041 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 139 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:00:37,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-03 04:00:37,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 150. [2022-11-03 04:00:37,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 79 states have (on average 1.0759493670886076) internal successors, (85), 75 states have internal predecessors, (85), 37 states have call successors, (37), 19 states have call predecessors, (37), 33 states have return successors, (125), 55 states have call predecessors, (125), 37 states have call successors, (125) [2022-11-03 04:00:37,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 247 transitions. [2022-11-03 04:00:37,078 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 247 transitions. Word has length 103 [2022-11-03 04:00:37,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:37,079 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 247 transitions. [2022-11-03 04:00:37,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) [2022-11-03 04:00:37,079 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 247 transitions. [2022-11-03 04:00:37,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-03 04:00:37,081 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:37,082 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:37,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:37,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 04:00:37,300 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:37,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:37,301 INFO L85 PathProgramCache]: Analyzing trace with hash -479723811, now seen corresponding path program 7 times [2022-11-03 04:00:37,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:37,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589409358] [2022-11-03 04:00:37,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:37,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:37,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:37,500 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 103 proven. 231 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2022-11-03 04:00:37,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:37,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589409358] [2022-11-03 04:00:37,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589409358] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:37,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006865441] [2022-11-03 04:00:37,501 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:00:37,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:37,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:37,502 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:37,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 04:00:37,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:37,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 04:00:37,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:37,703 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 430 proven. 88 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2022-11-03 04:00:37,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:38,601 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 103 proven. 236 refuted. 0 times theorem prover too weak. 431 trivial. 0 not checked. [2022-11-03 04:00:38,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006865441] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:38,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1242206897] [2022-11-03 04:00:38,603 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:38,604 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:38,604 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) [2022-11-03 04:00:38,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:38,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 15 [2022-11-03 04:00:38,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742654704] [2022-11-03 04:00:38,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:38,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 04:00:38,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:38,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 04:00:38,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-11-03 04:00:38,608 INFO L87 Difference]: Start difference. First operand 150 states and 247 transitions. Second operand has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) [2022-11-03 04:00:38,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:38,868 INFO L93 Difference]: Finished difference Result 299 states and 584 transitions. [2022-11-03 04:00:38,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 04:00:38,869 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) Word has length 117 [2022-11-03 04:00:38,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:38,873 INFO L225 Difference]: With dead ends: 299 [2022-11-03 04:00:38,873 INFO L226 Difference]: Without dead ends: 193 [2022-11-03 04:00:38,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 226 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2022-11-03 04:00:38,875 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 40 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:38,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 119 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:00:38,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2022-11-03 04:00:38,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 166. [2022-11-03 04:00:38,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 87 states have (on average 1.0689655172413792) internal successors, (93), 85 states have internal predecessors, (93), 45 states have call successors, (45), 23 states have call predecessors, (45), 33 states have return successors, (121), 57 states have call predecessors, (121), 45 states have call successors, (121) [2022-11-03 04:00:38,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 259 transitions. [2022-11-03 04:00:38,910 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 259 transitions. Word has length 117 [2022-11-03 04:00:38,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:38,910 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 259 transitions. [2022-11-03 04:00:38,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) [2022-11-03 04:00:38,911 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 259 transitions. [2022-11-03 04:00:38,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-03 04:00:38,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:38,914 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:38,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:39,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:39,129 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:39,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:39,129 INFO L85 PathProgramCache]: Analyzing trace with hash 480006941, now seen corresponding path program 8 times [2022-11-03 04:00:39,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:39,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966876109] [2022-11-03 04:00:39,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:39,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:39,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:39,353 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 121 proven. 213 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2022-11-03 04:00:39,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:39,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966876109] [2022-11-03 04:00:39,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966876109] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:39,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241607678] [2022-11-03 04:00:39,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:00:39,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:39,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:39,355 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:39,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 04:00:39,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 04:00:39,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:39,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-03 04:00:39,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:39,718 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 63 proven. 185 refuted. 0 times theorem prover too weak. 522 trivial. 0 not checked. [2022-11-03 04:00:39,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:40,412 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 63 proven. 198 refuted. 0 times theorem prover too weak. 509 trivial. 0 not checked. [2022-11-03 04:00:40,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241607678] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:40,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318355130] [2022-11-03 04:00:40,415 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:40,415 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:40,415 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) [2022-11-03 04:00:40,415 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:40,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 17] total 27 [2022-11-03 04:00:40,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653951843] [2022-11-03 04:00:40,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:40,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-03 04:00:40,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:40,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-03 04:00:40,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2022-11-03 04:00:40,417 INFO L87 Difference]: Start difference. First operand 166 states and 259 transitions. Second operand has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) [2022-11-03 04:00:41,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:41,170 INFO L93 Difference]: Finished difference Result 297 states and 548 transitions. [2022-11-03 04:00:41,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 04:00:41,171 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) Word has length 117 [2022-11-03 04:00:41,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:41,173 INFO L225 Difference]: With dead ends: 297 [2022-11-03 04:00:41,173 INFO L226 Difference]: Without dead ends: 179 [2022-11-03 04:00:41,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=343, Invalid=1637, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 04:00:41,176 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 52 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:41,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 283 Invalid, 927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 04:00:41,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-11-03 04:00:41,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 155. [2022-11-03 04:00:41,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 81 states have internal predecessors, (87), 44 states have call successors, (44), 23 states have call predecessors, (44), 28 states have return successors, (99), 50 states have call predecessors, (99), 44 states have call successors, (99) [2022-11-03 04:00:41,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 230 transitions. [2022-11-03 04:00:41,209 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 230 transitions. Word has length 117 [2022-11-03 04:00:41,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:41,209 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 230 transitions. [2022-11-03 04:00:41,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) [2022-11-03 04:00:41,210 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 230 transitions. [2022-11-03 04:00:41,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2022-11-03 04:00:41,216 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:41,216 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 16, 15, 15, 15, 15, 15, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:41,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 04:00:41,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:41,439 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:00:41,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:00:41,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1718503799, now seen corresponding path program 9 times [2022-11-03 04:00:41,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:00:41,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672766949] [2022-11-03 04:00:41,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:00:41,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:00:41,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:00:43,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 74 proven. 705 refuted. 0 times theorem prover too weak. 1321 trivial. 0 not checked. [2022-11-03 04:00:43,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:00:43,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672766949] [2022-11-03 04:00:43,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672766949] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:43,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632959473] [2022-11-03 04:00:43,809 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:00:43,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:00:43,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:00:43,810 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:00:43,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 04:00:44,036 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:00:44,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:00:44,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 175 conjunts are in the unsatisfiable core [2022-11-03 04:00:44,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:00:44,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 0 proven. 705 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2022-11-03 04:00:44,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:49,889 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-03 04:00:49,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632959473] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:00:49,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [994272525] [2022-11-03 04:00:49,892 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:00:49,892 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:00:49,892 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) [2022-11-03 04:00:49,893 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:49,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 58] total 83 [2022-11-03 04:00:49,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038596966] [2022-11-03 04:00:49,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:49,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-03 04:00:49,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:00:49,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-03 04:00:49,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=6505, Unknown=0, NotChecked=0, Total=6806 [2022-11-03 04:00:49,898 INFO L87 Difference]: Start difference. First operand 155 states and 230 transitions. Second operand has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) [2022-11-03 04:01:27,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:27,139 INFO L93 Difference]: Finished difference Result 521 states and 871 transitions. [2022-11-03 04:01:27,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2022-11-03 04:01:27,139 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) Word has length 183 [2022-11-03 04:01:27,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:27,145 INFO L225 Difference]: With dead ends: 521 [2022-11-03 04:01:27,145 INFO L226 Difference]: Without dead ends: 517 [2022-11-03 04:01:27,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 615 GetRequests, 350 SyntacticMatches, 23 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17502 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=8051, Invalid=51241, Unknown=0, NotChecked=0, Total=59292 [2022-11-03 04:01:27,157 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 1644 mSDsluCounter, 933 mSDsCounter, 0 mSdLazyCounter, 11016 mSolverCounterSat, 6015 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1651 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 17031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 6015 IncrementalHoareTripleChecker+Valid, 11016 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:27,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1651 Valid, 974 Invalid, 17031 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [6015 Valid, 11016 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2022-11-03 04:01:27,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2022-11-03 04:01:27,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 432. [2022-11-03 04:01:27,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 232 states have (on average 1.0603448275862069) internal successors, (246), 224 states have internal predecessors, (246), 121 states have call successors, (121), 71 states have call predecessors, (121), 78 states have return successors, (299), 136 states have call predecessors, (299), 121 states have call successors, (299) [2022-11-03 04:01:27,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 666 transitions. [2022-11-03 04:01:27,246 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 666 transitions. Word has length 183 [2022-11-03 04:01:27,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:27,248 INFO L495 AbstractCegarLoop]: Abstraction has 432 states and 666 transitions. [2022-11-03 04:01:27,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) [2022-11-03 04:01:27,248 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 666 transitions. [2022-11-03 04:01:27,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-11-03 04:01:27,254 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:27,254 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 16, 15, 15, 15, 15, 15, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:27,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:27,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 04:01:27,470 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:27,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:27,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1881135043, now seen corresponding path program 10 times [2022-11-03 04:01:27,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:27,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897714234] [2022-11-03 04:01:27,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:27,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:27,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:27,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 415 refuted. 0 times theorem prover too weak. 1592 trivial. 0 not checked. [2022-11-03 04:01:27,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:27,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897714234] [2022-11-03 04:01:27,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897714234] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:27,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332133245] [2022-11-03 04:01:27,958 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:01:27,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:27,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:27,960 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:27,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 04:01:28,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:28,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 04:01:28,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:28,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 415 refuted. 0 times theorem prover too weak. 1592 trivial. 0 not checked. [2022-11-03 04:01:28,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:30,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 447 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2022-11-03 04:01:30,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332133245] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:30,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1820053681] [2022-11-03 04:01:30,042 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:01:30,042 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:30,043 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) [2022-11-03 04:01:30,044 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:30,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 25 [2022-11-03 04:01:30,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191967529] [2022-11-03 04:01:30,048 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:30,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 04:01:30,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:30,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 04:01:30,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2022-11-03 04:01:30,050 INFO L87 Difference]: Start difference. First operand 432 states and 666 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) [2022-11-03 04:01:30,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:30,475 INFO L93 Difference]: Finished difference Result 519 states and 954 transitions. [2022-11-03 04:01:30,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 04:01:30,475 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) Word has length 189 [2022-11-03 04:01:30,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:30,481 INFO L225 Difference]: With dead ends: 519 [2022-11-03 04:01:30,482 INFO L226 Difference]: Without dead ends: 495 [2022-11-03 04:01:30,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 365 SyntacticMatches, 11 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 04:01:30,483 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 49 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:30,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 154 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:01:30,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2022-11-03 04:01:30,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 423. [2022-11-03 04:01:30,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 225 states have (on average 1.0577777777777777) internal successors, (238), 216 states have internal predecessors, (238), 121 states have call successors, (121), 70 states have call predecessors, (121), 76 states have return successors, (328), 136 states have call predecessors, (328), 121 states have call successors, (328) [2022-11-03 04:01:30,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 687 transitions. [2022-11-03 04:01:30,582 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 687 transitions. Word has length 189 [2022-11-03 04:01:30,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:30,583 INFO L495 AbstractCegarLoop]: Abstraction has 423 states and 687 transitions. [2022-11-03 04:01:30,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) [2022-11-03 04:01:30,583 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 687 transitions. [2022-11-03 04:01:30,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2022-11-03 04:01:30,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:30,589 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 20, 19, 19, 19, 19, 19, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:30,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:30,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:30,811 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:30,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:30,811 INFO L85 PathProgramCache]: Analyzing trace with hash 607584119, now seen corresponding path program 11 times [2022-11-03 04:01:30,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:30,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193754034] [2022-11-03 04:01:30,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:30,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:30,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:31,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 266 proven. 761 refuted. 0 times theorem prover too weak. 2309 trivial. 0 not checked. [2022-11-03 04:01:31,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:31,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193754034] [2022-11-03 04:01:31,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193754034] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:31,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980161038] [2022-11-03 04:01:31,240 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:01:31,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:31,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:31,243 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:31,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 04:01:31,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-11-03 04:01:31,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:31,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 04:01:31,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:31,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 378 proven. 405 refuted. 0 times theorem prover too weak. 2553 trivial. 0 not checked. [2022-11-03 04:01:31,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:33,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 382 proven. 441 refuted. 0 times theorem prover too weak. 2513 trivial. 0 not checked. [2022-11-03 04:01:33,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980161038] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:33,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21614949] [2022-11-03 04:01:33,812 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:01:33,812 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:33,813 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) [2022-11-03 04:01:33,814 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:33,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 23] total 30 [2022-11-03 04:01:33,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564429130] [2022-11-03 04:01:33,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:33,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-03 04:01:33,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:33,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-03 04:01:33,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2022-11-03 04:01:33,816 INFO L87 Difference]: Start difference. First operand 423 states and 687 transitions. Second operand has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) [2022-11-03 04:01:34,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:34,682 INFO L93 Difference]: Finished difference Result 837 states and 1573 transitions. [2022-11-03 04:01:34,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-03 04:01:34,683 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) Word has length 223 [2022-11-03 04:01:34,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:34,689 INFO L225 Difference]: With dead ends: 837 [2022-11-03 04:01:34,689 INFO L226 Difference]: Without dead ends: 505 [2022-11-03 04:01:34,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 422 SyntacticMatches, 11 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=381, Invalid=1875, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 04:01:34,693 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 115 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 767 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 767 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:34,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 197 Invalid, 980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 767 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 04:01:34,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2022-11-03 04:01:34,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 413. [2022-11-03 04:01:34,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 217 states have (on average 1.055299539170507) internal successors, (229), 213 states have internal predecessors, (229), 123 states have call successors, (123), 68 states have call predecessors, (123), 72 states have return successors, (264), 131 states have call predecessors, (264), 123 states have call successors, (264) [2022-11-03 04:01:34,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 616 transitions. [2022-11-03 04:01:34,783 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 616 transitions. Word has length 223 [2022-11-03 04:01:34,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:34,783 INFO L495 AbstractCegarLoop]: Abstraction has 413 states and 616 transitions. [2022-11-03 04:01:34,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) [2022-11-03 04:01:34,784 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 616 transitions. [2022-11-03 04:01:34,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2022-11-03 04:01:34,792 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:34,792 INFO L195 NwaCegarLoop]: trace histogram [63, 63, 32, 31, 31, 31, 31, 31, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:34,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:35,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 04:01:35,019 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:35,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:35,019 INFO L85 PathProgramCache]: Analyzing trace with hash 247251005, now seen corresponding path program 12 times [2022-11-03 04:01:35,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:35,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148697425] [2022-11-03 04:01:35,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:35,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:35,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:41,508 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 154 proven. 2940 refuted. 0 times theorem prover too weak. 5700 trivial. 0 not checked. [2022-11-03 04:01:41,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:41,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148697425] [2022-11-03 04:01:41,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148697425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:41,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614026195] [2022-11-03 04:01:41,509 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:01:41,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:41,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:41,510 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:41,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 04:01:41,913 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:01:41,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:41,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 1651 conjuncts, 339 conjunts are in the unsatisfiable core [2022-11-03 04:01:41,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:43,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 0 proven. 2940 refuted. 0 times theorem prover too weak. 5854 trivial. 0 not checked. [2022-11-03 04:01:43,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:54,936 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 0 proven. 8644 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2022-11-03 04:01:54,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614026195] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:54,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668328295] [2022-11-03 04:01:54,939 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:01:54,939 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:54,940 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) [2022-11-03 04:01:54,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:54,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25, 108] total 139 [2022-11-03 04:01:54,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399667199] [2022-11-03 04:01:54,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:54,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-03 04:01:54,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:54,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-03 04:01:54,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=18689, Unknown=0, NotChecked=0, Total=19182 [2022-11-03 04:01:54,946 INFO L87 Difference]: Start difference. First operand 413 states and 616 transitions. Second operand has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) [2022-11-03 04:05:44,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:05:44,531 INFO L93 Difference]: Finished difference Result 1274 states and 2202 transitions. [2022-11-03 04:05:44,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 402 states. [2022-11-03 04:05:44,540 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) Word has length 349 [2022-11-03 04:05:44,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:05:44,552 INFO L225 Difference]: With dead ends: 1274 [2022-11-03 04:05:44,553 INFO L226 Difference]: Without dead ends: 1270 [2022-11-03 04:05:44,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1253 GetRequests, 691 SyntacticMatches, 40 SemanticMatches, 522 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87745 ImplicationChecksByTransitivity, 200.1s TimeCoverageRelationStatistics Valid=37658, Invalid=236394, Unknown=0, NotChecked=0, Total=274052 [2022-11-03 04:05:44,589 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 6922 mSDsluCounter, 2886 mSDsCounter, 0 mSdLazyCounter, 43966 mSolverCounterSat, 24491 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6930 SdHoareTripleChecker+Valid, 2979 SdHoareTripleChecker+Invalid, 68457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 24491 IncrementalHoareTripleChecker+Valid, 43966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 33.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:05:44,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6930 Valid, 2979 Invalid, 68457 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [24491 Valid, 43966 Invalid, 0 Unknown, 0 Unchecked, 33.4s Time] [2022-11-03 04:05:44,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1270 states. [2022-11-03 04:05:44,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1270 to 1097. [2022-11-03 04:05:44,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1097 states, 589 states have (on average 1.0492359932088284) internal successors, (618), 570 states have internal predecessors, (618), 324 states have call successors, (324), 196 states have call predecessors, (324), 183 states have return successors, (769), 330 states have call predecessors, (769), 324 states have call successors, (769) [2022-11-03 04:05:44,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1097 states to 1097 states and 1711 transitions. [2022-11-03 04:05:44,865 INFO L78 Accepts]: Start accepts. Automaton has 1097 states and 1711 transitions. Word has length 349 [2022-11-03 04:05:44,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:05:44,866 INFO L495 AbstractCegarLoop]: Abstraction has 1097 states and 1711 transitions. [2022-11-03 04:05:44,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) [2022-11-03 04:05:44,867 INFO L276 IsEmpty]: Start isEmpty. Operand 1097 states and 1711 transitions. [2022-11-03 04:05:44,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2022-11-03 04:05:44,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:05:44,880 INFO L195 NwaCegarLoop]: trace histogram [63, 63, 32, 31, 31, 31, 31, 31, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:05:44,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 04:05:45,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 04:05:45,095 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:05:45,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:05:45,095 INFO L85 PathProgramCache]: Analyzing trace with hash -2054178505, now seen corresponding path program 13 times [2022-11-03 04:05:45,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:05:45,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679934230] [2022-11-03 04:05:45,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:05:45,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:05:45,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:45,938 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1112 refuted. 0 times theorem prover too weak. 7456 trivial. 0 not checked. [2022-11-03 04:05:45,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:05:45,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679934230] [2022-11-03 04:05:45,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679934230] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:05:45,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61511602] [2022-11-03 04:05:45,939 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:05:45,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:45,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:05:45,943 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:05:45,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 04:05:46,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:46,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 1665 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 04:05:46,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:05:46,414 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1112 refuted. 0 times theorem prover too weak. 7456 trivial. 0 not checked. [2022-11-03 04:05:46,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:05:49,092 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1162 refuted. 0 times theorem prover too weak. 7406 trivial. 0 not checked. [2022-11-03 04:05:49,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61511602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:05:49,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140824128] [2022-11-03 04:05:49,094 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:05:49,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:05:49,094 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) [2022-11-03 04:05:49,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:05:49,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 29 [2022-11-03 04:05:49,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315985088] [2022-11-03 04:05:49,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:05:49,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 04:05:49,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:05:49,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 04:05:49,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2022-11-03 04:05:49,098 INFO L87 Difference]: Start difference. First operand 1097 states and 1711 transitions. Second operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) [2022-11-03 04:05:49,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:05:49,671 INFO L93 Difference]: Finished difference Result 1264 states and 2331 transitions. [2022-11-03 04:05:49,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 04:05:49,671 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) Word has length 355 [2022-11-03 04:05:49,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:05:49,686 INFO L225 Difference]: With dead ends: 1264 [2022-11-03 04:05:49,687 INFO L226 Difference]: Without dead ends: 1237 [2022-11-03 04:05:49,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 695 SyntacticMatches, 13 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=1321, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 04:05:49,689 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 29 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:05:49,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 226 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:05:49,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1237 states. [2022-11-03 04:05:50,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1237 to 1085. [2022-11-03 04:05:50,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1085 states, 580 states have (on average 1.0482758620689656) internal successors, (608), 560 states have internal predecessors, (608), 324 states have call successors, (324), 195 states have call predecessors, (324), 180 states have return successors, (819), 329 states have call predecessors, (819), 324 states have call successors, (819) [2022-11-03 04:05:50,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1751 transitions. [2022-11-03 04:05:50,083 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1751 transitions. Word has length 355 [2022-11-03 04:05:50,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:05:50,084 INFO L495 AbstractCegarLoop]: Abstraction has 1085 states and 1751 transitions. [2022-11-03 04:05:50,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) [2022-11-03 04:05:50,085 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1751 transitions. [2022-11-03 04:05:50,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2022-11-03 04:05:50,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:05:50,094 INFO L195 NwaCegarLoop]: trace histogram [79, 79, 40, 39, 39, 39, 39, 39, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:05:50,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 04:05:50,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 04:05:50,307 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:05:50,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:05:50,307 INFO L85 PathProgramCache]: Analyzing trace with hash -439798723, now seen corresponding path program 14 times [2022-11-03 04:05:50,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:05:50,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212645218] [2022-11-03 04:05:50,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:05:50,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:05:50,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:51,157 INFO L134 CoverageAnalysis]: Checked inductivity of 13858 backedges. 1349 proven. 1794 refuted. 0 times theorem prover too weak. 10715 trivial. 0 not checked. [2022-11-03 04:05:51,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:05:51,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212645218] [2022-11-03 04:05:51,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212645218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:05:51,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420161578] [2022-11-03 04:05:51,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:05:51,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:51,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:05:51,159 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:05:51,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 04:05:51,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2022-11-03 04:05:51,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:05:51,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 1547 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 04:05:51,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:05:51,953 INFO L134 CoverageAnalysis]: Checked inductivity of 13858 backedges. 2180 proven. 577 refuted. 0 times theorem prover too weak. 11101 trivial. 0 not checked. [2022-11-03 04:05:51,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:05:54,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13858 backedges. 2180 proven. 611 refuted. 0 times theorem prover too weak. 11067 trivial. 0 not checked. [2022-11-03 04:05:54,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420161578] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:05:54,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49696295] [2022-11-03 04:05:54,721 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:05:54,721 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:05:54,721 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) [2022-11-03 04:05:54,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:05:54,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 21] total 26 [2022-11-03 04:05:54,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526310984] [2022-11-03 04:05:54,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:05:54,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 04:05:54,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:05:54,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 04:05:54,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2022-11-03 04:05:54,725 INFO L87 Difference]: Start difference. First operand 1085 states and 1751 transitions. Second operand has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 21 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (52), 22 states have call predecessors, (52), 21 states have call successors, (52) [2022-11-03 04:05:55,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:05:55,533 INFO L93 Difference]: Finished difference Result 2005 states and 3473 transitions. [2022-11-03 04:05:55,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-03 04:05:55,534 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 21 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (52), 22 states have call predecessors, (52), 21 states have call successors, (52) Word has length 429 [2022-11-03 04:05:55,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:05:55,545 INFO L225 Difference]: With dead ends: 2005 [2022-11-03 04:05:55,545 INFO L226 Difference]: Without dead ends: 1200 [2022-11-03 04:05:55,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 899 GetRequests, 847 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=469, Invalid=1423, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 04:05:55,553 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 140 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 04:05:55,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 247 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 04:05:55,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1200 states. [2022-11-03 04:05:55,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1200 to 976. [2022-11-03 04:05:55,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 976 states, 492 states have (on average 1.0548780487804879) internal successors, (519), 492 states have internal predecessors, (519), 303 states have call successors, (303), 151 states have call predecessors, (303), 180 states have return successors, (532), 332 states have call predecessors, (532), 303 states have call successors, (532) [2022-11-03 04:05:55,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 976 states to 976 states and 1354 transitions. [2022-11-03 04:05:55,976 INFO L78 Accepts]: Start accepts. Automaton has 976 states and 1354 transitions. Word has length 429 [2022-11-03 04:05:55,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:05:55,976 INFO L495 AbstractCegarLoop]: Abstraction has 976 states and 1354 transitions. [2022-11-03 04:05:55,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 21 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (52), 22 states have call predecessors, (52), 21 states have call successors, (52) [2022-11-03 04:05:55,977 INFO L276 IsEmpty]: Start isEmpty. Operand 976 states and 1354 transitions. [2022-11-03 04:05:55,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2022-11-03 04:05:55,992 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:05:55,992 INFO L195 NwaCegarLoop]: trace histogram [127, 127, 64, 63, 63, 63, 63, 63, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:05:56,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 04:05:56,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 04:05:56,219 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:05:56,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:05:56,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1562767421, now seen corresponding path program 15 times [2022-11-03 04:05:56,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:05:56,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146789154] [2022-11-03 04:05:56,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:05:56,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:05:56,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:57,765 INFO L134 CoverageAnalysis]: Checked inductivity of 35962 backedges. 537 proven. 2750 refuted. 0 times theorem prover too weak. 32675 trivial. 0 not checked. [2022-11-03 04:05:57,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:05:57,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146789154] [2022-11-03 04:05:57,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146789154] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:05:57,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855916099] [2022-11-03 04:05:57,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:05:57,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:57,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:05:57,767 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:05:57,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 04:05:58,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:05:58,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:05:58,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 3168 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 04:05:58,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:05:58,519 INFO L134 CoverageAnalysis]: Checked inductivity of 35962 backedges. 537 proven. 2750 refuted. 0 times theorem prover too weak. 32675 trivial. 0 not checked. [2022-11-03 04:05:58,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:06:02,290 INFO L134 CoverageAnalysis]: Checked inductivity of 35962 backedges. 537 proven. 2802 refuted. 0 times theorem prover too weak. 32623 trivial. 0 not checked. [2022-11-03 04:06:02,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855916099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:06:02,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703924008] [2022-11-03 04:06:02,292 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:06:02,293 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:06:02,293 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) [2022-11-03 04:06:02,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:06:02,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 29 [2022-11-03 04:06:02,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122878155] [2022-11-03 04:06:02,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:06:02,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 04:06:02,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:06:02,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 04:06:02,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=671, Unknown=0, NotChecked=0, Total=812 [2022-11-03 04:06:02,297 INFO L87 Difference]: Start difference. First operand 976 states and 1354 transitions. Second operand has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 20 states have call successors, (22), 1 states have call predecessors, (22), 13 states have return successors, (30), 13 states have call predecessors, (30), 20 states have call successors, (30) [2022-11-03 04:06:02,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:06:02,921 INFO L93 Difference]: Finished difference Result 1038 states and 1415 transitions. [2022-11-03 04:06:02,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 04:06:02,921 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 20 states have call successors, (22), 1 states have call predecessors, (22), 13 states have return successors, (30), 13 states have call predecessors, (30), 20 states have call successors, (30) Word has length 669 [2022-11-03 04:06:02,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:06:02,931 INFO L225 Difference]: With dead ends: 1038 [2022-11-03 04:06:02,931 INFO L226 Difference]: Without dead ends: 1031 [2022-11-03 04:06:02,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1375 GetRequests, 1323 SyntacticMatches, 13 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 412 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=1315, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 04:06:02,933 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 04:06:02,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 204 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 04:06:02,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1031 states. [2022-11-03 04:06:03,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1031 to 973. [2022-11-03 04:06:03,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 973 states, 491 states have (on average 1.054989816700611) internal successors, (518), 491 states have internal predecessors, (518), 302 states have call successors, (302), 151 states have call predecessors, (302), 179 states have return successors, (528), 330 states have call predecessors, (528), 302 states have call successors, (528) [2022-11-03 04:06:03,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 973 states to 973 states and 1348 transitions. [2022-11-03 04:06:03,196 INFO L78 Accepts]: Start accepts. Automaton has 973 states and 1348 transitions. Word has length 669 [2022-11-03 04:06:03,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:06:03,197 INFO L495 AbstractCegarLoop]: Abstraction has 973 states and 1348 transitions. [2022-11-03 04:06:03,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 20 states have call successors, (22), 1 states have call predecessors, (22), 13 states have return successors, (30), 13 states have call predecessors, (30), 20 states have call successors, (30) [2022-11-03 04:06:03,198 INFO L276 IsEmpty]: Start isEmpty. Operand 973 states and 1348 transitions. [2022-11-03 04:06:03,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 676 [2022-11-03 04:06:03,207 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:06:03,208 INFO L195 NwaCegarLoop]: trace histogram [127, 127, 64, 63, 63, 63, 63, 63, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:06:03,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 04:06:03,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 04:06:03,423 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:06:03,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:06:03,423 INFO L85 PathProgramCache]: Analyzing trace with hash -866850505, now seen corresponding path program 16 times [2022-11-03 04:06:03,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:06:03,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453105714] [2022-11-03 04:06:03,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:06:03,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:06:03,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:06:21,173 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 314 proven. 12010 refuted. 0 times theorem prover too weak. 23666 trivial. 0 not checked. [2022-11-03 04:06:21,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:06:21,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453105714] [2022-11-03 04:06:21,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453105714] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:06:21,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745220967] [2022-11-03 04:06:21,174 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:06:21,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:06:21,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:06:21,175 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:06:21,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_433444b3-95d7-41ac-92ee-ca8b8a59723b/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 04:06:21,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:06:21,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 3233 conjuncts, 663 conjunts are in the unsatisfiable core [2022-11-03 04:06:21,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:06:24,126 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 0 proven. 12010 refuted. 0 times theorem prover too weak. 23980 trivial. 0 not checked. [2022-11-03 04:06:24,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:06:55,135 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 0 proven. 35698 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2022-11-03 04:06:55,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745220967] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:06:55,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916100625] [2022-11-03 04:06:55,137 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 04:06:55,137 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:06:55,138 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) [2022-11-03 04:06:55,139 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:06:55,139 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29, 206] total 243 [2022-11-03 04:06:55,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568230521] [2022-11-03 04:06:55,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:06:55,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 243 states [2022-11-03 04:06:55,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:06:55,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 243 interpolants. [2022-11-03 04:06:55,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=833, Invalid=57973, Unknown=0, NotChecked=0, Total=58806 [2022-11-03 04:06:55,149 INFO L87 Difference]: Start difference. First operand 973 states and 1348 transitions. Second operand has 243 states, 175 states have (on average 1.7885714285714285) internal successors, (313), 190 states have internal predecessors, (313), 103 states have call successors, (142), 68 states have call predecessors, (142), 120 states have return successors, (160), 123 states have call predecessors, (160), 103 states have call successors, (160)