./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/gcd02.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/gcd02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7 --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 5840bf8cb045a250261e3957017079dce43a53700f7c91e31c16b36d5b980e00 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:32:19,023 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:32:19,025 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:32:19,058 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:32:19,059 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:32:19,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:32:19,062 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:32:19,065 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:32:19,067 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:32:19,068 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:32:19,069 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:32:19,071 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:32:19,071 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:32:19,073 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:32:19,074 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:32:19,076 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:32:19,077 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:32:19,078 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:32:19,080 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:32:19,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:32:19,085 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:32:19,087 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:32:19,088 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:32:19,089 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:32:19,093 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:32:19,094 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:32:19,094 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:32:19,095 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:32:19,096 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:32:19,097 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:32:19,097 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:32:19,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:32:19,099 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:32:19,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:32:19,101 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:32:19,102 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:32:19,103 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:32:19,103 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:32:19,103 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:32:19,104 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:32:19,105 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:32:19,106 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:32:19,142 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:32:19,142 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:32:19,142 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:32:19,143 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:32:19,144 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:32:19,144 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:32:19,144 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:32:19,145 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:32:19,145 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:32:19,146 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:32:19,146 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:32:19,146 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:32:19,147 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:32:19,147 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:32:19,147 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:32:19,148 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:32:19,148 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:32:19,148 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:32:19,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:32:19,150 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:32:19,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:32:19,151 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:32:19,151 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:32:19,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:32:19,152 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:32:19,162 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:32:19,162 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:32:19,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:32:19,163 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:32:19,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:32:19,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:32:19,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:32:19,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:32:19,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:32:19,166 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:32:19,166 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:32:19,166 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:32:19,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:32:19,167 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:32:19,167 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:32:19,168 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:32:19,168 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5840bf8cb045a250261e3957017079dce43a53700f7c91e31c16b36d5b980e00 [2021-11-25 20:32:19,426 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:32:19,455 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:32:19,458 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:32:19,460 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:32:19,461 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:32:19,462 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/recursive/gcd02.c [2021-11-25 20:32:19,542 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/data/f013abd36/1605090ef3df44b7b26fa018c10db8d5/FLAG77ad57709 [2021-11-25 20:32:19,994 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:32:19,995 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/sv-benchmarks/c/recursive/gcd02.c [2021-11-25 20:32:20,007 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/data/f013abd36/1605090ef3df44b7b26fa018c10db8d5/FLAG77ad57709 [2021-11-25 20:32:20,379 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/data/f013abd36/1605090ef3df44b7b26fa018c10db8d5 [2021-11-25 20:32:20,382 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:32:20,383 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:32:20,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:32:20,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:32:20,397 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:32:20,398 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,399 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a9f0a70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20, skipping insertion in model container [2021-11-25 20:32:20,399 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,405 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:32:20,419 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:32:20,587 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_a3839dcd-8acd-4de2-a184-8bca363c9c27/sv-benchmarks/c/recursive/gcd02.c[623,636] [2021-11-25 20:32:20,599 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_a3839dcd-8acd-4de2-a184-8bca363c9c27/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2021-11-25 20:32:20,600 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:32:20,608 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:32:20,620 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_a3839dcd-8acd-4de2-a184-8bca363c9c27/sv-benchmarks/c/recursive/gcd02.c[623,636] [2021-11-25 20:32:20,626 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_a3839dcd-8acd-4de2-a184-8bca363c9c27/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2021-11-25 20:32:20,627 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:32:20,639 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:32:20,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20 WrapperNode [2021-11-25 20:32:20,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:32:20,641 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:32:20,641 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:32:20,641 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:32:20,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,655 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,671 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 37 [2021-11-25 20:32:20,671 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:32:20,672 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:32:20,672 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:32:20,672 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:32:20,679 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,681 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,685 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,687 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,688 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,690 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:32:20,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:32:20,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:32:20,691 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:32:20,692 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (1/1) ... [2021-11-25 20:32:20,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:32:20,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:20,727 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:32:20,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:32:20,780 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:32:20,781 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2021-11-25 20:32:20,781 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2021-11-25 20:32:20,781 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:32:20,781 INFO L130 BoogieDeclarations]: Found specification of procedure divides [2021-11-25 20:32:20,781 INFO L138 BoogieDeclarations]: Found implementation of procedure divides [2021-11-25 20:32:20,781 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:32:20,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:32:20,844 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:32:20,846 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:32:20,974 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:32:20,987 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:32:20,987 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 20:32:20,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:32:20 BoogieIcfgContainer [2021-11-25 20:32:20,989 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:32:20,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:32:20,991 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:32:20,995 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:32:20,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:32:20" (1/3) ... [2021-11-25 20:32:20,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47e0aceb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:32:20, skipping insertion in model container [2021-11-25 20:32:20,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:32:20" (2/3) ... [2021-11-25 20:32:20,997 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47e0aceb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:32:20, skipping insertion in model container [2021-11-25 20:32:20,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:32:20" (3/3) ... [2021-11-25 20:32:20,998 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd02.c [2021-11-25 20:32:21,004 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:32:21,004 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 20:32:21,094 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:32:21,116 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:32:21,117 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 20:32:21,150 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 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) [2021-11-25 20:32:21,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:32:21,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:21,155 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:21,155 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:21,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:21,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1549950046, now seen corresponding path program 1 times [2021-11-25 20:32:21,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:21,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055075327] [2021-11-25 20:32:21,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:21,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:21,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:21,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:21,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055075327] [2021-11-25 20:32:21,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055075327] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:21,412 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:21,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:32:21,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969302280] [2021-11-25 20:32:21,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:21,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:32:21,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:21,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:32:21,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:32:21,449 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 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 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:21,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:21,562 INFO L93 Difference]: Finished difference Result 73 states and 98 transitions. [2021-11-25 20:32:21,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:32:21,564 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:32:21,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:21,572 INFO L225 Difference]: With dead ends: 73 [2021-11-25 20:32:21,572 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:32:21,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:32:21,579 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 34 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:21,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 122 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:21,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:32:21,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 20:32:21,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:32:21,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2021-11-25 20:32:21,621 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 8 [2021-11-25 20:32:21,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:21,621 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2021-11-25 20:32:21,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:21,622 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2021-11-25 20:32:21,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:32:21,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:21,623 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:21,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:32:21,624 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:21,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:21,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1756513854, now seen corresponding path program 1 times [2021-11-25 20:32:21,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:21,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907245982] [2021-11-25 20:32:21,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:21,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:21,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:21,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:21,751 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:21,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907245982] [2021-11-25 20:32:21,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907245982] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:21,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:21,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:32:21,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618174291] [2021-11-25 20:32:21,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:21,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:32:21,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:21,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:32:21,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:32:21,756 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:21,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:21,923 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2021-11-25 20:32:21,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:32:21,924 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 20:32:21,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:21,927 INFO L225 Difference]: With dead ends: 58 [2021-11-25 20:32:21,928 INFO L226 Difference]: Without dead ends: 56 [2021-11-25 20:32:21,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:32:21,930 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 17 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:21,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 145 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:21,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-25 20:32:21,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-11-25 20:32:21,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:32:21,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-11-25 20:32:21,952 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 13 [2021-11-25 20:32:21,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:21,952 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-11-25 20:32:21,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:21,953 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-11-25 20:32:21,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:32:21,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:21,958 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:21,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:32:21,959 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:21,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:21,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1759343999, now seen corresponding path program 1 times [2021-11-25 20:32:21,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:21,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687721598] [2021-11-25 20:32:21,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:21,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:22,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:22,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:22,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:22,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687721598] [2021-11-25 20:32:22,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687721598] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:22,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:22,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:32:22,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472604393] [2021-11-25 20:32:22,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:22,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:32:22,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:22,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:32:22,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:32:22,137 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:22,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:22,289 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2021-11-25 20:32:22,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:32:22,290 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 20:32:22,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:22,292 INFO L225 Difference]: With dead ends: 62 [2021-11-25 20:32:22,293 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 20:32:22,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:32:22,295 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 23 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:22,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 152 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:22,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 20:32:22,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 48. [2021-11-25 20:32:22,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:32:22,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-25 20:32:22,311 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 13 [2021-11-25 20:32:22,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:22,312 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-25 20:32:22,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:22,312 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-25 20:32:22,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:32:22,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:22,314 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:22,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:32:22,315 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:22,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:22,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1880095371, now seen corresponding path program 1 times [2021-11-25 20:32:22,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:22,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817432952] [2021-11-25 20:32:22,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:22,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:22,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:22,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:22,365 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:22,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817432952] [2021-11-25 20:32:22,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817432952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:22,366 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:22,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:32:22,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284383586] [2021-11-25 20:32:22,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:22,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:32:22,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:22,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:32:22,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:32:22,370 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:32:22,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:22,384 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2021-11-25 20:32:22,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:32:22,385 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-11-25 20:32:22,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:22,386 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:32:22,387 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:32:22,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:32:22,389 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:22,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 92 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:32:22,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:32:22,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 20:32:22,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-25 20:32:22,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-11-25 20:32:22,401 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 19 [2021-11-25 20:32:22,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:22,401 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-11-25 20:32:22,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:32:22,402 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-11-25 20:32:22,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:32:22,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:22,404 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:22,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:32:22,404 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:22,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:22,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1134762375, now seen corresponding path program 1 times [2021-11-25 20:32:22,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:22,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031422181] [2021-11-25 20:32:22,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:22,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:22,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:22,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:22,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:22,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031422181] [2021-11-25 20:32:22,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031422181] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:22,498 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:22,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 20:32:22,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427463015] [2021-11-25 20:32:22,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:22,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:32:22,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:22,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:32:22,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:32:22,503 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:32:22,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:22,694 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2021-11-25 20:32:22,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:32:22,695 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-25 20:32:22,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:22,700 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:32:22,700 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 20:32:22,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:32:22,705 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 16 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:22,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 112 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:22,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 20:32:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2021-11-25 20:32:22,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 41 states have internal predecessors, (46), 10 states have call successors, (10), 4 states have call predecessors, (10), 7 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-25 20:32:22,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-11-25 20:32:22,737 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 20 [2021-11-25 20:32:22,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:22,738 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-11-25 20:32:22,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:32:22,738 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-11-25 20:32:22,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:32:22,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:22,742 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:22,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:32:22,742 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:22,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:22,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1512584049, now seen corresponding path program 1 times [2021-11-25 20:32:22,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:22,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461357318] [2021-11-25 20:32:22,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:22,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:22,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:22,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:32:22,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:22,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461357318] [2021-11-25 20:32:22,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461357318] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:22,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:22,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:32:22,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058160340] [2021-11-25 20:32:22,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:22,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:32:22,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:22,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:32:22,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:32:22,828 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 20:32:22,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:22,847 INFO L93 Difference]: Finished difference Result 63 states and 78 transitions. [2021-11-25 20:32:22,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:32:22,848 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-25 20:32:22,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:22,852 INFO L225 Difference]: With dead ends: 63 [2021-11-25 20:32:22,852 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:32:22,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:32:22,855 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:22,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 121 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:32:22,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:32:22,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-25 20:32:22,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 39 states have internal predecessors, (44), 10 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-25 20:32:22,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 67 transitions. [2021-11-25 20:32:22,874 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 67 transitions. Word has length 26 [2021-11-25 20:32:22,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:22,874 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 67 transitions. [2021-11-25 20:32:22,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 20:32:22,875 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 67 transitions. [2021-11-25 20:32:22,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:32:22,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:22,876 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:22,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:32:22,876 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:22,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:22,877 INFO L85 PathProgramCache]: Analyzing trace with hash -36939295, now seen corresponding path program 1 times [2021-11-25 20:32:22,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:22,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800018512] [2021-11-25 20:32:22,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:22,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:22,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:23,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:32:23,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:23,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800018512] [2021-11-25 20:32:23,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800018512] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:23,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806022116] [2021-11-25 20:32:23,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:23,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:23,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:23,192 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:23,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:32:23,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:23,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:32:23,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:23,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:32:23,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:23,846 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:32:23,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806022116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:23,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113948794] [2021-11-25 20:32:23,874 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 20:32:23,875 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:23,881 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:23,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:23,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2021-11-25 20:32:23,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091302038] [2021-11-25 20:32:23,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:23,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 20:32:23,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:23,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 20:32:23,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:32:23,893 INFO L87 Difference]: Start difference. First operand 54 states and 67 transitions. Second operand has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:32:24,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:24,099 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2021-11-25 20:32:24,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:32:24,100 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) Word has length 27 [2021-11-25 20:32:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:24,106 INFO L225 Difference]: With dead ends: 62 [2021-11-25 20:32:24,106 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:32:24,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:32:24,112 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 24 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:24,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 131 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:24,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:32:24,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2021-11-25 20:32:24,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:32:24,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2021-11-25 20:32:24,131 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 27 [2021-11-25 20:32:24,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:24,131 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2021-11-25 20:32:24,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:32:24,132 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2021-11-25 20:32:24,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:32:24,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:24,138 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:24,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:24,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:24,354 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:24,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:24,354 INFO L85 PathProgramCache]: Analyzing trace with hash -645776947, now seen corresponding path program 1 times [2021-11-25 20:32:24,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:24,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975405164] [2021-11-25 20:32:24,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:24,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:24,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:24,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:32:24,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:24,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975405164] [2021-11-25 20:32:24,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975405164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:24,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814203795] [2021-11-25 20:32:24,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:24,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:24,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:24,502 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:24,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:32:24,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:24,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:32:24,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:24,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:32:24,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:24,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:32:24,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814203795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:24,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1757054201] [2021-11-25 20:32:24,984 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-25 20:32:24,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:24,985 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:24,985 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:24,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2021-11-25 20:32:24,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175689616] [2021-11-25 20:32:24,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:24,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:32:24,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:24,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:32:24,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:32:24,987 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:32:25,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:25,197 INFO L93 Difference]: Finished difference Result 73 states and 92 transitions. [2021-11-25 20:32:25,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:32:25,197 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 28 [2021-11-25 20:32:25,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:25,198 INFO L225 Difference]: With dead ends: 73 [2021-11-25 20:32:25,199 INFO L226 Difference]: Without dead ends: 69 [2021-11-25 20:32:25,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:32:25,200 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 34 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:25,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 192 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:25,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-25 20:32:25,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2021-11-25 20:32:25,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 40 states have (on average 1.15) internal successors, (46), 41 states have internal predecessors, (46), 10 states have call successors, (10), 4 states have call predecessors, (10), 7 states have return successors, (16), 12 states have call predecessors, (16), 10 states have call successors, (16) [2021-11-25 20:32:25,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2021-11-25 20:32:25,212 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 28 [2021-11-25 20:32:25,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:25,213 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2021-11-25 20:32:25,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:32:25,213 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2021-11-25 20:32:25,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:32:25,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:25,214 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:25,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:25,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:25,434 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:25,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:25,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1157552339, now seen corresponding path program 1 times [2021-11-25 20:32:25,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:25,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437197079] [2021-11-25 20:32:25,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:25,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:25,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:25,520 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:32:25,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:25,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437197079] [2021-11-25 20:32:25,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437197079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:32:25,521 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:32:25,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 20:32:25,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276749796] [2021-11-25 20:32:25,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:32:25,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:32:25,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:25,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:32:25,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:32:25,523 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 20:32:25,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:25,673 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2021-11-25 20:32:25,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:32:25,674 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-11-25 20:32:25,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:25,675 INFO L225 Difference]: With dead ends: 79 [2021-11-25 20:32:25,675 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 20:32:25,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:32:25,676 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 14 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:25,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 129 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:25,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 20:32:25,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2021-11-25 20:32:25,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 43 states have internal predecessors, (49), 10 states have call successors, (10), 4 states have call predecessors, (10), 8 states have return successors, (19), 14 states have call predecessors, (19), 10 states have call successors, (19) [2021-11-25 20:32:25,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2021-11-25 20:32:25,696 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 28 [2021-11-25 20:32:25,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:25,696 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2021-11-25 20:32:25,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 20:32:25,696 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2021-11-25 20:32:25,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:32:25,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:25,700 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:25,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 20:32:25,701 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:25,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:25,701 INFO L85 PathProgramCache]: Analyzing trace with hash -730439667, now seen corresponding path program 1 times [2021-11-25 20:32:25,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:25,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683804755] [2021-11-25 20:32:25,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:25,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:25,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:25,861 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:32:25,862 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:25,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683804755] [2021-11-25 20:32:25,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683804755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:25,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156711391] [2021-11-25 20:32:25,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:25,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:25,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:25,863 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:25,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:32:25,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:25,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:32:25,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:26,150 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:32:26,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:26,708 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:32:26,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156711391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:26,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [449756162] [2021-11-25 20:32:26,713 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:26,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:26,714 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:26,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:26,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 20 [2021-11-25 20:32:26,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275992812] [2021-11-25 20:32:26,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:26,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:32:26,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:26,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:32:26,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:32:26,719 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:32:26,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:26,974 INFO L93 Difference]: Finished difference Result 88 states and 114 transitions. [2021-11-25 20:32:26,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:32:26,975 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) Word has length 35 [2021-11-25 20:32:26,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:26,976 INFO L225 Difference]: With dead ends: 88 [2021-11-25 20:32:26,976 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 20:32:26,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 52 SyntacticMatches, 11 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:32:26,978 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 20 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:26,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 230 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:26,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 20:32:26,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 72. [2021-11-25 20:32:26,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 50 states have internal predecessors, (55), 11 states have call successors, (11), 4 states have call predecessors, (11), 11 states have return successors, (27), 17 states have call predecessors, (27), 11 states have call successors, (27) [2021-11-25 20:32:26,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 93 transitions. [2021-11-25 20:32:26,996 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 93 transitions. Word has length 35 [2021-11-25 20:32:26,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:26,996 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 93 transitions. [2021-11-25 20:32:26,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:32:26,997 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 93 transitions. [2021-11-25 20:32:26,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:32:26,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:26,999 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:27,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:27,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:27,199 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:27,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:27,200 INFO L85 PathProgramCache]: Analyzing trace with hash 1412671149, now seen corresponding path program 1 times [2021-11-25 20:32:27,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:27,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818014979] [2021-11-25 20:32:27,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:27,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:27,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:27,386 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:27,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:27,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818014979] [2021-11-25 20:32:27,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818014979] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:27,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636906760] [2021-11-25 20:32:27,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:27,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:27,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:27,388 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:27,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:32:27,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:27,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:32:27,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:27,626 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:27,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:27,956 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:27,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636906760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:27,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [314191190] [2021-11-25 20:32:27,959 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:27,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:27,959 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:27,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:27,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 16 [2021-11-25 20:32:27,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038000170] [2021-11-25 20:32:27,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:27,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:32:27,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:27,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:32:27,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:32:27,963 INFO L87 Difference]: Start difference. First operand 72 states and 93 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:32:28,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:28,145 INFO L93 Difference]: Finished difference Result 83 states and 107 transitions. [2021-11-25 20:32:28,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:32:28,146 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) Word has length 35 [2021-11-25 20:32:28,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:28,147 INFO L225 Difference]: With dead ends: 83 [2021-11-25 20:32:28,147 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 20:32:28,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 62 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:32:28,148 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 23 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:28,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 117 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:28,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 20:32:28,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2021-11-25 20:32:28,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 48 states have (on average 1.125) internal successors, (54), 50 states have internal predecessors, (54), 11 states have call successors, (11), 4 states have call predecessors, (11), 11 states have return successors, (26), 16 states have call predecessors, (26), 11 states have call successors, (26) [2021-11-25 20:32:28,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2021-11-25 20:32:28,158 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 35 [2021-11-25 20:32:28,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:28,159 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2021-11-25 20:32:28,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:32:28,159 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2021-11-25 20:32:28,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:32:28,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:28,161 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:28,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:28,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:32:28,375 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:28,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:28,375 INFO L85 PathProgramCache]: Analyzing trace with hash 1675208857, now seen corresponding path program 1 times [2021-11-25 20:32:28,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:28,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144871370] [2021-11-25 20:32:28,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:28,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:28,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:32:28,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:28,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144871370] [2021-11-25 20:32:28,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144871370] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:28,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951807779] [2021-11-25 20:32:28,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:28,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:28,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:28,527 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:28,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:32:28,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:28,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:32:28,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:28,874 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:32:28,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:29,537 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:32:29,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951807779] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:29,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1059130054] [2021-11-25 20:32:29,540 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:29,540 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:29,540 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:29,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:29,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 34 [2021-11-25 20:32:29,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226009970] [2021-11-25 20:32:29,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:29,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 20:32:29,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:29,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 20:32:29,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:32:29,543 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-25 20:32:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:30,062 INFO L93 Difference]: Finished difference Result 120 states and 158 transitions. [2021-11-25 20:32:30,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:32:30,063 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) Word has length 36 [2021-11-25 20:32:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:30,065 INFO L225 Difference]: With dead ends: 120 [2021-11-25 20:32:30,065 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 20:32:30,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:32:30,067 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 55 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:30,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 313 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:30,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 20:32:30,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2021-11-25 20:32:30,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 11 states have call successors, (11), 4 states have call predecessors, (11), 13 states have return successors, (31), 18 states have call predecessors, (31), 11 states have call successors, (31) [2021-11-25 20:32:30,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 100 transitions. [2021-11-25 20:32:30,083 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 100 transitions. Word has length 36 [2021-11-25 20:32:30,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:30,084 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 100 transitions. [2021-11-25 20:32:30,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-25 20:32:30,084 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 100 transitions. [2021-11-25 20:32:30,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:32:30,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:30,086 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:30,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:30,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:32:30,302 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:30,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:30,302 INFO L85 PathProgramCache]: Analyzing trace with hash 109703257, now seen corresponding path program 2 times [2021-11-25 20:32:30,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:30,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124089856] [2021-11-25 20:32:30,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:30,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:30,404 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:32:30,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:30,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124089856] [2021-11-25 20:32:30,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124089856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:30,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349294178] [2021-11-25 20:32:30,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:30,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:30,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:30,406 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:30,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:32:30,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:32:30,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:30,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:32:30,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:32:30,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:31,694 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:32:31,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349294178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:31,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [995698357] [2021-11-25 20:32:31,697 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:31,697 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:31,698 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:31,699 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:31,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 33 [2021-11-25 20:32:31,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898113398] [2021-11-25 20:32:31,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:31,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:32:31,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:31,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:32:31,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:32:31,702 INFO L87 Difference]: Start difference. First operand 77 states and 100 transitions. Second operand has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-25 20:32:32,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:32,150 INFO L93 Difference]: Finished difference Result 117 states and 155 transitions. [2021-11-25 20:32:32,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:32,153 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 36 [2021-11-25 20:32:32,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:32,155 INFO L225 Difference]: With dead ends: 117 [2021-11-25 20:32:32,155 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:32:32,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=1455, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:32:32,157 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:32,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 241 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:32,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:32:32,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 86. [2021-11-25 20:32:32,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 58 states have internal predecessors, (65), 11 states have call successors, (11), 4 states have call predecessors, (11), 15 states have return successors, (37), 23 states have call predecessors, (37), 11 states have call successors, (37) [2021-11-25 20:32:32,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 113 transitions. [2021-11-25 20:32:32,174 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 113 transitions. Word has length 36 [2021-11-25 20:32:32,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:32,174 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 113 transitions. [2021-11-25 20:32:32,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-25 20:32:32,174 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 113 transitions. [2021-11-25 20:32:32,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 20:32:32,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:32,176 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:32,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:32,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:32,402 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:32,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:32,402 INFO L85 PathProgramCache]: Analyzing trace with hash -108106833, now seen corresponding path program 2 times [2021-11-25 20:32:32,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:32,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261657663] [2021-11-25 20:32:32,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:32,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:32,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:32,699 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:32:32,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:32,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261657663] [2021-11-25 20:32:32,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261657663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:32,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283268975] [2021-11-25 20:32:32,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:32,700 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:32,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:32,705 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:32,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:32:32,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:32:32,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:32,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:32:32,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:33,201 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:33,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:34,041 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:32:34,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283268975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:34,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054195006] [2021-11-25 20:32:34,043 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:34,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:34,044 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:34,044 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:34,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16] total 35 [2021-11-25 20:32:34,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075449029] [2021-11-25 20:32:34,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:34,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:32:34,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:34,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:32:34,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:32:34,049 INFO L87 Difference]: Start difference. First operand 86 states and 113 transitions. Second operand has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:32:34,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:34,780 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2021-11-25 20:32:34,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:32:34,781 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) Word has length 42 [2021-11-25 20:32:34,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:34,782 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:32:34,782 INFO L226 Difference]: Without dead ends: 87 [2021-11-25 20:32:34,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:32:34,784 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 59 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:34,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 282 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:34,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-25 20:32:34,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 78. [2021-11-25 20:32:34,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 53 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (31), 20 states have call predecessors, (31), 10 states have call successors, (31) [2021-11-25 20:32:34,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 101 transitions. [2021-11-25 20:32:34,801 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 101 transitions. Word has length 42 [2021-11-25 20:32:34,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:34,801 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 101 transitions. [2021-11-25 20:32:34,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:32:34,802 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 101 transitions. [2021-11-25 20:32:34,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 20:32:34,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:34,803 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:34,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:35,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:32:35,030 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:35,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:35,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1392489715, now seen corresponding path program 3 times [2021-11-25 20:32:35,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:35,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038564545] [2021-11-25 20:32:35,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:35,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:35,198 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:35,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:35,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038564545] [2021-11-25 20:32:35,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038564545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:35,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565826304] [2021-11-25 20:32:35,198 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:35,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:35,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:35,199 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:35,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:32:35,258 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:35,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:35,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:32:35,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:35,560 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:32:35,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:36,568 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:36,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565826304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:36,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1294047441] [2021-11-25 20:32:36,572 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:36,573 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:36,573 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:36,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:36,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 19] total 35 [2021-11-25 20:32:36,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396189434] [2021-11-25 20:32:36,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:36,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:32:36,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:36,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:32:36,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:32:36,578 INFO L87 Difference]: Start difference. First operand 78 states and 101 transitions. Second operand has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) [2021-11-25 20:32:37,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:37,200 INFO L93 Difference]: Finished difference Result 123 states and 167 transitions. [2021-11-25 20:32:37,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:32:37,201 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) Word has length 44 [2021-11-25 20:32:37,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:37,202 INFO L225 Difference]: With dead ends: 123 [2021-11-25 20:32:37,202 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 20:32:37,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 68 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=324, Invalid=2126, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:32:37,205 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 30 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:37,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 299 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:37,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 20:32:37,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 55. [2021-11-25 20:32:37,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 40 states have internal predecessors, (44), 9 states have call successors, (9), 4 states have call predecessors, (9), 7 states have return successors, (14), 10 states have call predecessors, (14), 9 states have call successors, (14) [2021-11-25 20:32:37,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2021-11-25 20:32:37,214 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 44 [2021-11-25 20:32:37,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:37,214 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2021-11-25 20:32:37,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) [2021-11-25 20:32:37,214 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2021-11-25 20:32:37,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:32:37,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:37,215 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:37,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:37,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:32:37,438 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:37,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:37,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1481032095, now seen corresponding path program 3 times [2021-11-25 20:32:37,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:37,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579453405] [2021-11-25 20:32:37,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:37,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:37,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:37,604 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:32:37,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:37,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579453405] [2021-11-25 20:32:37,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579453405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:37,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371442161] [2021-11-25 20:32:37,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:37,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:37,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:37,607 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:37,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:32:37,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:37,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:37,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:32:37,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:37,966 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:32:37,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:38,788 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:32:38,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371442161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:38,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163305985] [2021-11-25 20:32:38,790 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:38,790 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:38,791 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:38,791 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:38,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 28 [2021-11-25 20:32:38,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590609529] [2021-11-25 20:32:38,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:38,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:32:38,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:38,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:32:38,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=675, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:32:38,793 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:32:39,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:39,113 INFO L93 Difference]: Finished difference Result 85 states and 107 transitions. [2021-11-25 20:32:39,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:32:39,114 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 43 [2021-11-25 20:32:39,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:39,115 INFO L225 Difference]: With dead ends: 85 [2021-11-25 20:32:39,115 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 20:32:39,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 61 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=180, Invalid=1080, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:32:39,117 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 58 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:39,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 241 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:39,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 20:32:39,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 66. [2021-11-25 20:32:39,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 47 states have internal predecessors, (51), 10 states have call successors, (10), 4 states have call predecessors, (10), 10 states have return successors, (21), 14 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-25 20:32:39,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 82 transitions. [2021-11-25 20:32:39,124 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 82 transitions. Word has length 43 [2021-11-25 20:32:39,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:39,125 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 82 transitions. [2021-11-25 20:32:39,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:32:39,125 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 82 transitions. [2021-11-25 20:32:39,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:32:39,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:39,126 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:39,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 20:32:39,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:32:39,342 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:39,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:39,342 INFO L85 PathProgramCache]: Analyzing trace with hash -755567679, now seen corresponding path program 1 times [2021-11-25 20:32:39,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:39,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223525881] [2021-11-25 20:32:39,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:39,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:39,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:39,494 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:39,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:39,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223525881] [2021-11-25 20:32:39,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223525881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:39,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596699625] [2021-11-25 20:32:39,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:39,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:39,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:39,504 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:39,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:32:39,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:39,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:32:39,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:39,944 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:32:39,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:40,923 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:32:40,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596699625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:40,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379207160] [2021-11-25 20:32:40,926 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:40,926 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:40,927 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:40,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:40,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17] total 33 [2021-11-25 20:32:40,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850951856] [2021-11-25 20:32:40,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:40,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:32:40,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:40,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:32:40,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:32:40,930 INFO L87 Difference]: Start difference. First operand 66 states and 82 transitions. Second operand has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:32:41,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:41,587 INFO L93 Difference]: Finished difference Result 111 states and 146 transitions. [2021-11-25 20:32:41,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:32:41,588 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) Word has length 43 [2021-11-25 20:32:41,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:41,589 INFO L225 Difference]: With dead ends: 111 [2021-11-25 20:32:41,590 INFO L226 Difference]: Without dead ends: 107 [2021-11-25 20:32:41,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 62 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=259, Invalid=1811, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:32:41,591 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 83 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 708 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:41,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 454 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 708 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:32:41,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-25 20:32:41,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2021-11-25 20:32:41,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 48 states have (on average 1.125) internal successors, (54), 49 states have internal predecessors, (54), 10 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (24), 16 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 20:32:41,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 88 transitions. [2021-11-25 20:32:41,606 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 88 transitions. Word has length 43 [2021-11-25 20:32:41,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:41,606 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 88 transitions. [2021-11-25 20:32:41,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:32:41,606 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 88 transitions. [2021-11-25 20:32:41,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:32:41,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:41,607 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:41,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:41,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:41,834 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:41,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:41,835 INFO L85 PathProgramCache]: Analyzing trace with hash 647656449, now seen corresponding path program 2 times [2021-11-25 20:32:41,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:41,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623882940] [2021-11-25 20:32:41,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:41,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:41,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:41,992 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:32:41,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:41,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623882940] [2021-11-25 20:32:41,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623882940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:41,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360223865] [2021-11-25 20:32:41,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:41,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:41,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:41,994 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:42,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:32:42,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:32:42,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:42,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:32:42,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:42,323 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:32:42,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:43,034 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:32:43,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360223865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:43,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1035669273] [2021-11-25 20:32:43,037 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:43,037 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:43,037 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:43,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:43,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 21 [2021-11-25 20:32:43,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678224487] [2021-11-25 20:32:43,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:43,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 20:32:43,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:43,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 20:32:43,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:32:43,039 INFO L87 Difference]: Start difference. First operand 70 states and 88 transitions. Second operand has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 20:32:43,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:43,293 INFO L93 Difference]: Finished difference Result 98 states and 125 transitions. [2021-11-25 20:32:43,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:32:43,294 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 43 [2021-11-25 20:32:43,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:43,295 INFO L225 Difference]: With dead ends: 98 [2021-11-25 20:32:43,295 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 20:32:43,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 65 SyntacticMatches, 16 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:32:43,297 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 46 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:43,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 248 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:43,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 20:32:43,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 77. [2021-11-25 20:32:43,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (30), 19 states have call predecessors, (30), 10 states have call successors, (30) [2021-11-25 20:32:43,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2021-11-25 20:32:43,306 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 43 [2021-11-25 20:32:43,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:43,306 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2021-11-25 20:32:43,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 20:32:43,307 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2021-11-25 20:32:43,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:32:43,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:43,308 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:43,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:43,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:32:43,514 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:43,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:43,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1586980819, now seen corresponding path program 3 times [2021-11-25 20:32:43,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:43,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191839075] [2021-11-25 20:32:43,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:43,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:43,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:43,703 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:32:43,703 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:43,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191839075] [2021-11-25 20:32:43,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191839075] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:43,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739299540] [2021-11-25 20:32:43,704 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:43,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:43,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:43,706 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:43,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:32:43,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:43,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:43,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:32:43,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:44,112 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:32:44,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:45,362 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:32:45,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739299540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:45,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415623554] [2021-11-25 20:32:45,364 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:45,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:45,365 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:45,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:45,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 19] total 31 [2021-11-25 20:32:45,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433335590] [2021-11-25 20:32:45,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:45,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:32:45,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:45,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:32:45,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:32:45,377 INFO L87 Difference]: Start difference. First operand 77 states and 99 transitions. Second operand has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-25 20:32:45,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:45,863 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2021-11-25 20:32:45,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:32:45,863 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) Word has length 51 [2021-11-25 20:32:45,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:45,865 INFO L225 Difference]: With dead ends: 128 [2021-11-25 20:32:45,865 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 20:32:45,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 74 SyntacticMatches, 17 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=227, Invalid=1413, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:32:45,867 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 64 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:45,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 329 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:45,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 20:32:45,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 79. [2021-11-25 20:32:45,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (30), 21 states have call predecessors, (30), 10 states have call successors, (30) [2021-11-25 20:32:45,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2021-11-25 20:32:45,884 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 51 [2021-11-25 20:32:45,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:45,884 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2021-11-25 20:32:45,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-25 20:32:45,885 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2021-11-25 20:32:45,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:32:45,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:45,886 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:45,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:46,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:46,102 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:46,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:46,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1551997235, now seen corresponding path program 4 times [2021-11-25 20:32:46,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:46,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658628008] [2021-11-25 20:32:46,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:46,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:46,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:32:46,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:46,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658628008] [2021-11-25 20:32:46,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658628008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:46,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929168354] [2021-11-25 20:32:46,272 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:46,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:46,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:46,278 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:46,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:32:46,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:46,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:32:46,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:46,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:48,090 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:32:48,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929168354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:48,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55545023] [2021-11-25 20:32:48,095 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:48,096 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:48,097 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:48,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:48,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 20] total 36 [2021-11-25 20:32:48,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972132654] [2021-11-25 20:32:48,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:48,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:32:48,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:48,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:32:48,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:32:48,102 INFO L87 Difference]: Start difference. First operand 79 states and 101 transitions. Second operand has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:48,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:48,783 INFO L93 Difference]: Finished difference Result 123 states and 165 transitions. [2021-11-25 20:32:48,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:32:48,784 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) Word has length 51 [2021-11-25 20:32:48,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:48,785 INFO L225 Difference]: With dead ends: 123 [2021-11-25 20:32:48,785 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 20:32:48,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 76 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=320, Invalid=2230, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:32:48,788 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 42 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 700 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:48,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 333 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 700 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:32:48,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 20:32:48,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 58. [2021-11-25 20:32:48,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 40 states have (on average 1.15) internal successors, (46), 42 states have internal predecessors, (46), 9 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (15), 11 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 20:32:48,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-11-25 20:32:48,805 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 51 [2021-11-25 20:32:48,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:48,811 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-11-25 20:32:48,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:48,811 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-11-25 20:32:48,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:32:48,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:48,813 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:48,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:49,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:49,026 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:49,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:49,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1294432549, now seen corresponding path program 4 times [2021-11-25 20:32:49,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:49,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413724061] [2021-11-25 20:32:49,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:49,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:49,240 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:49,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:49,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413724061] [2021-11-25 20:32:49,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413724061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:49,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503876654] [2021-11-25 20:32:49,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:49,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:49,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:49,246 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:49,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:32:49,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:49,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:32:49,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:49,720 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:49,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:50,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503876654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:50,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80570431] [2021-11-25 20:32:50,740 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:32:50,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:50,741 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:50,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:50,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2021-11-25 20:32:50,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303749480] [2021-11-25 20:32:50,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:50,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:32:50,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:50,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:32:50,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:32:50,745 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:32:51,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:51,164 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2021-11-25 20:32:51,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:32:51,165 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) Word has length 50 [2021-11-25 20:32:51,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:51,166 INFO L225 Difference]: With dead ends: 88 [2021-11-25 20:32:51,166 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 20:32:51,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 73 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:32:51,168 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:51,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 405 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 543 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:51,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 20:32:51,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 69. [2021-11-25 20:32:51,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 47 states have (on average 1.127659574468085) internal successors, (53), 49 states have internal predecessors, (53), 10 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (22), 15 states have call predecessors, (22), 10 states have call successors, (22) [2021-11-25 20:32:51,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2021-11-25 20:32:51,175 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 50 [2021-11-25 20:32:51,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:51,175 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2021-11-25 20:32:51,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:32:51,176 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2021-11-25 20:32:51,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:32:51,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:51,177 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:51,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:51,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:32:51,402 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:51,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:51,402 INFO L85 PathProgramCache]: Analyzing trace with hash 36046203, now seen corresponding path program 5 times [2021-11-25 20:32:51,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:51,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661309950] [2021-11-25 20:32:51,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:51,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:51,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:51,597 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:51,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:51,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661309950] [2021-11-25 20:32:51,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661309950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:51,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580492414] [2021-11-25 20:32:51,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:51,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:51,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:51,599 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:51,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:32:51,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:32:51,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:51,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:32:51,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:52,026 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:52,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:52,901 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:32:52,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580492414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:52,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954386737] [2021-11-25 20:32:52,902 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:52,903 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:52,903 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:52,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:52,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2021-11-25 20:32:52,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683130190] [2021-11-25 20:32:52,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:52,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:32:52,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:52,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:32:52,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:32:52,906 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:32:53,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:53,313 INFO L93 Difference]: Finished difference Result 96 states and 120 transitions. [2021-11-25 20:32:53,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:32:53,313 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) Word has length 50 [2021-11-25 20:32:53,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:53,314 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:32:53,314 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 20:32:53,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 74 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:32:53,315 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 82 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:53,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 414 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 558 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:53,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 20:32:53,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 72. [2021-11-25 20:32:53,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 51 states have internal predecessors, (55), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (24), 16 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 20:32:53,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2021-11-25 20:32:53,323 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 50 [2021-11-25 20:32:53,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:53,324 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2021-11-25 20:32:53,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:32:53,324 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2021-11-25 20:32:53,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:32:53,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:53,325 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:53,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:53,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 20:32:53,554 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:53,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:53,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1876802875, now seen corresponding path program 6 times [2021-11-25 20:32:53,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:53,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673204634] [2021-11-25 20:32:53,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:53,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:53,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:53,820 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:32:53,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:53,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673204634] [2021-11-25 20:32:53,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673204634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:53,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485905750] [2021-11-25 20:32:53,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:53,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:53,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:53,821 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:53,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:32:53,924 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:53,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:53,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:32:53,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:54,286 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:32:54,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:55,170 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:32:55,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485905750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:55,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044902408] [2021-11-25 20:32:55,172 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:55,172 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:55,172 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:55,173 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:55,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 17] total 37 [2021-11-25 20:32:55,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172883740] [2021-11-25 20:32:55,174 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:55,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 20:32:55,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:55,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 20:32:55,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:32:55,176 INFO L87 Difference]: Start difference. First operand 72 states and 89 transitions. Second operand has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:55,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:55,861 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2021-11-25 20:32:55,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:55,862 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) Word has length 50 [2021-11-25 20:32:55,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:55,863 INFO L225 Difference]: With dead ends: 90 [2021-11-25 20:32:55,864 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 20:32:55,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 74 SyntacticMatches, 8 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=257, Invalid=1999, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:32:55,865 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 55 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:55,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 341 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:55,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 20:32:55,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2021-11-25 20:32:55,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (24), 17 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 20:32:55,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2021-11-25 20:32:55,873 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 50 [2021-11-25 20:32:55,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:55,874 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2021-11-25 20:32:55,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:55,874 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2021-11-25 20:32:55,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:32:55,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:55,875 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:55,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:56,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:32:56,089 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:56,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:56,090 INFO L85 PathProgramCache]: Analyzing trace with hash 1448267663, now seen corresponding path program 7 times [2021-11-25 20:32:56,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:56,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101161888] [2021-11-25 20:32:56,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:56,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:56,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:56,311 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:32:56,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:56,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101161888] [2021-11-25 20:32:56,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101161888] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:56,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403730659] [2021-11-25 20:32:56,312 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:56,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:56,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:56,313 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:56,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:32:56,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:56,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 20:32:56,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:56,876 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:32:56,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:58,248 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:32:58,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403730659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:58,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449881507] [2021-11-25 20:32:58,250 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:32:58,250 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:58,251 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-25 20:32:58,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:58,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 19] total 30 [2021-11-25 20:32:58,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013941288] [2021-11-25 20:32:58,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:58,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:32:58,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:58,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:32:58,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:32:58,256 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:58,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:58,733 INFO L93 Difference]: Finished difference Result 103 states and 128 transitions. [2021-11-25 20:32:58,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:58,734 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) Word has length 58 [2021-11-25 20:32:58,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:58,735 INFO L225 Difference]: With dead ends: 103 [2021-11-25 20:32:58,735 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 20:32:58,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 87 SyntacticMatches, 20 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:32:58,737 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 57 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:58,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 453 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:58,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 20:32:58,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 80. [2021-11-25 20:32:58,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 55 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 14 states have return successors, (30), 20 states have call predecessors, (30), 10 states have call successors, (30) [2021-11-25 20:32:58,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 101 transitions. [2021-11-25 20:32:58,745 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 101 transitions. Word has length 58 [2021-11-25 20:32:58,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:58,746 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 101 transitions. [2021-11-25 20:32:58,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:32:58,746 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 101 transitions. [2021-11-25 20:32:58,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:32:58,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:58,747 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:58,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:58,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:58,974 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:58,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:58,974 INFO L85 PathProgramCache]: Analyzing trace with hash -189962193, now seen corresponding path program 5 times [2021-11-25 20:32:58,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:58,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008378829] [2021-11-25 20:32:58,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:58,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:58,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:59,224 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 3 proven. 43 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:32:59,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:59,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008378829] [2021-11-25 20:32:59,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008378829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:59,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577096855] [2021-11-25 20:32:59,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:59,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:59,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:59,226 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:59,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3839dcd-8acd-4de2-a184-8bca363c9c27/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:32:59,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:32:59,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:59,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:32:59,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:00,034 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:33:00,035 INFO L328 TraceCheckSpWp]: Computing backward predicates...