./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P --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 715908359373978289cc76ce2f00faf49f4d4a3c6ddae64771646fc969bea981 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:49:52,978 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:49:52,981 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:49:53,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:49:53,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:49:53,028 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:49:53,030 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:49:53,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:49:53,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:49:53,037 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:49:53,038 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:49:53,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:49:53,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:49:53,041 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:49:53,043 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:49:53,045 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:49:53,046 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:49:53,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:49:53,049 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:49:53,052 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:49:53,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:49:53,064 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:49:53,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:49:53,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:49:53,072 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:49:53,077 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:49:53,078 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:49:53,079 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:49:53,081 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:49:53,082 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:49:53,083 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:49:53,085 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:49:53,087 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:49:53,088 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:49:53,089 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:49:53,090 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:49:53,091 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:49:53,091 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:49:53,091 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:49:53,092 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:49:53,093 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:49:53,094 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:49:53,142 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:49:53,142 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:49:53,143 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:49:53,143 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:49:53,147 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:49:53,147 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:49:53,147 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:49:53,147 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:49:53,147 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:49:53,148 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:49:53,148 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:49:53,148 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:49:53,148 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:49:53,148 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:49:53,149 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:49:53,149 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:49:53,149 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:49:53,149 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:49:53,150 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:49:53,150 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:49:53,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:49:53,151 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:49:53,151 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:49:53,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:49:53,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:49:53,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:49:53,152 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:49:53,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:49:53,152 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:49:53,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:49:53,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:49:53,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:49:53,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:53,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:49:53,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:49:53,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:49:53,154 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:49:53,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:49:53,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:49:53,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:49:53,154 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:49:53,155 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_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 715908359373978289cc76ce2f00faf49f4d4a3c6ddae64771646fc969bea981 [2021-11-20 22:49:53,434 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:49:53,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:49:53,467 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:49:53,468 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:49:53,469 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:49:53,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/recursive-simple/id_i15_o15-1.c [2021-11-20 22:49:53,535 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/data/d0a514f29/7e73ae84b22d4610b3f4fc404c2beb23/FLAGcf329fd50 [2021-11-20 22:49:53,992 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:49:53,993 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c [2021-11-20 22:49:53,998 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/data/d0a514f29/7e73ae84b22d4610b3f4fc404c2beb23/FLAGcf329fd50 [2021-11-20 22:49:54,396 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/data/d0a514f29/7e73ae84b22d4610b3f4fc404c2beb23 [2021-11-20 22:49:54,398 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:49:54,400 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:49:54,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:54,402 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:49:54,405 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:49:54,406 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16fecd28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54, skipping insertion in model container [2021-11-20 22:49:54,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,414 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:49:54,426 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:49:54,589 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_839948e5-be3d-4f01-a4e0-d7ca90395d89/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c[454,467] [2021-11-20 22:49:54,594 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:54,606 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:49:54,624 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_839948e5-be3d-4f01-a4e0-d7ca90395d89/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c[454,467] [2021-11-20 22:49:54,624 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:54,635 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:49:54,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54 WrapperNode [2021-11-20 22:49:54,635 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:54,636 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:54,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:49:54,637 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:49:54,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,651 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,666 INFO L137 Inliner]: procedures = 13, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2021-11-20 22:49:54,666 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:54,667 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:49:54,667 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:49:54,667 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:49:54,676 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,676 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,677 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,678 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,680 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,681 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,682 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:49:54,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:49:54,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:49:54,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:49:54,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (1/1) ... [2021-11-20 22:49:54,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:54,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:54,718 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:49:54,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:49:54,761 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:49:54,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:49:54,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:49:54,762 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:49:54,762 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-11-20 22:49:54,762 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-11-20 22:49:54,812 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:49:54,813 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:49:54,905 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:49:54,917 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:49:54,917 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-20 22:49:54,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:54 BoogieIcfgContainer [2021-11-20 22:49:54,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:49:54,922 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:49:54,922 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:49:54,926 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:49:54,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:49:54" (1/3) ... [2021-11-20 22:49:54,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47e450f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:54, skipping insertion in model container [2021-11-20 22:49:54,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:54" (2/3) ... [2021-11-20 22:49:54,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47e450f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:54, skipping insertion in model container [2021-11-20 22:49:54,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:54" (3/3) ... [2021-11-20 22:49:54,929 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-1.c [2021-11-20 22:49:54,935 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:49:54,935 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:49:55,005 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:49:55,012 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 [2021-11-20 22:49:55,013 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:49:55,033 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 22:49:55,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 22:49:55,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:55,039 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:55,040 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:55,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:55,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2021-11-20 22:49:55,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:55,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71960726] [2021-11-20 22:49:55,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:55,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:55,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:55,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:55,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:55,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71960726] [2021-11-20 22:49:55,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71960726] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:55,256 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:55,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 22:49:55,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914264513] [2021-11-20 22:49:55,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:55,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 22:49:55,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:55,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 22:49:55,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:49:55,291 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 22:49:55,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:55,353 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-11-20 22:49:55,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:49:55,357 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-11-20 22:49:55,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:55,365 INFO L225 Difference]: With dead ends: 22 [2021-11-20 22:49:55,365 INFO L226 Difference]: Without dead ends: 14 [2021-11-20 22:49:55,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:49:55,386 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:55,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:49:55,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-20 22:49:55,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-20 22:49:55,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 10 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 22:49:55,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-20 22:49:55,440 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-11-20 22:49:55,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:55,440 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-20 22:49:55,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 22:49:55,441 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-20 22:49:55,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 22:49:55,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:55,443 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:55,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:49:55,443 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:55,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:55,444 INFO L85 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2021-11-20 22:49:55,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:55,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139152415] [2021-11-20 22:49:55,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:55,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:55,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:55,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 22:49:55,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:55,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139152415] [2021-11-20 22:49:55,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139152415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:55,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081800861] [2021-11-20 22:49:55,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:55,583 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:55,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:55,585 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:55,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:49:55,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:55,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 22:49:55,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:55,837 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:49:55,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:56,057 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 22:49:56,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081800861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:56,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [907772832] [2021-11-20 22:49:56,092 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:49:56,092 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:56,096 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) [2021-11-20 22:49:56,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:56,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 12 [2021-11-20 22:49:56,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428078134] [2021-11-20 22:49:56,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:56,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 22:49:56,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:56,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 22:49:56,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-20 22:49:56,105 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 12 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 22:49:56,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:56,251 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-11-20 22:49:56,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 22:49:56,252 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 6 states have call successors, (6) Word has length 15 [2021-11-20 22:49:56,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:56,259 INFO L225 Difference]: With dead ends: 24 [2021-11-20 22:49:56,259 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 22:49:56,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2021-11-20 22:49:56,264 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 23 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:56,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 37 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:56,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 22:49:56,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-20 22:49:56,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 14 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 22:49:56,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-20 22:49:56,279 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2021-11-20 22:49:56,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:56,280 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-20 22:49:56,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 22:49:56,280 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-20 22:49:56,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 22:49:56,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:56,282 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:56,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:56,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:56,500 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:56,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:56,500 INFO L85 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 2 times [2021-11-20 22:49:56,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:56,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559088581] [2021-11-20 22:49:56,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:56,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:56,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 22:49:56,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:56,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559088581] [2021-11-20 22:49:56,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559088581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:56,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043957666] [2021-11-20 22:49:56,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:56,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:56,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:56,732 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:56,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:49:56,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 22:49:56,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:56,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 22:49:56,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:56,910 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 22:49:56,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:57,474 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:49:57,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043957666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:57,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1017535869] [2021-11-20 22:49:57,477 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:49:57,478 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:57,478 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) [2021-11-20 22:49:57,478 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:57,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11] total 16 [2021-11-20 22:49:57,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176388449] [2021-11-20 22:49:57,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:57,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 22:49:57,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:57,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 22:49:57,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-11-20 22:49:57,481 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 16 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (10), 5 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-20 22:49:57,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:57,640 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-11-20 22:49:57,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 22:49:57,640 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (10), 5 states have call predecessors, (10), 8 states have call successors, (10) Word has length 27 [2021-11-20 22:49:57,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:57,642 INFO L225 Difference]: With dead ends: 30 [2021-11-20 22:49:57,642 INFO L226 Difference]: Without dead ends: 26 [2021-11-20 22:49:57,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-11-20 22:49:57,644 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 43 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:57,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 40 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:49:57,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-20 22:49:57,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-20 22:49:57,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 18 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 22:49:57,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-20 22:49:57,651 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 27 [2021-11-20 22:49:57,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:57,652 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-20 22:49:57,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (10), 5 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-20 22:49:57,652 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-20 22:49:57,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 22:49:57,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:57,654 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:57,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:57,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 22:49:57,879 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:57,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:57,879 INFO L85 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 3 times [2021-11-20 22:49:57,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:57,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176121564] [2021-11-20 22:49:57,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:57,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:57,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:58,032 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-20 22:49:58,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:58,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176121564] [2021-11-20 22:49:58,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176121564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:58,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482705791] [2021-11-20 22:49:58,044 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:49:58,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:58,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:58,045 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:58,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:49:58,105 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:49:58,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:58,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 22:49:58,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:58,240 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 22:49:58,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:59,370 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 22:49:59,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482705791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:59,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136193989] [2021-11-20 22:49:59,374 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:49:59,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:59,374 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) [2021-11-20 22:49:59,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:59,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 15] total 20 [2021-11-20 22:49:59,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315448228] [2021-11-20 22:49:59,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:59,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 22:49:59,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:59,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 22:49:59,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2021-11-20 22:49:59,382 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 20 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-20 22:49:59,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:59,586 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-11-20 22:49:59,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 22:49:59,595 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) Word has length 39 [2021-11-20 22:49:59,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:59,598 INFO L225 Difference]: With dead ends: 36 [2021-11-20 22:49:59,600 INFO L226 Difference]: Without dead ends: 32 [2021-11-20 22:49:59,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=230, Invalid=526, Unknown=0, NotChecked=0, Total=756 [2021-11-20 22:49:59,604 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 39 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:59,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 57 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-20 22:49:59,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-20 22:49:59,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 22 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-20 22:49:59,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-20 22:49:59,612 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 39 [2021-11-20 22:49:59,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:59,612 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-20 22:49:59,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-20 22:49:59,613 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-20 22:49:59,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-20 22:49:59,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:59,618 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:59,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:59,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:59,841 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:59,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:59,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 4 times [2021-11-20 22:49:59,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:59,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121315339] [2021-11-20 22:49:59,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:59,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:59,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:00,042 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-20 22:50:00,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:00,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121315339] [2021-11-20 22:50:00,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121315339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:00,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418237361] [2021-11-20 22:50:00,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:50:00,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:00,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:00,046 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:00,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:50:00,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:00,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 22:50:00,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:00,264 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-20 22:50:00,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:02,368 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 22:50:02,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418237361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:02,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335138141] [2021-11-20 22:50:02,371 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:50:02,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:02,372 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) [2021-11-20 22:50:02,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:02,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 19] total 24 [2021-11-20 22:50:02,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332843022] [2021-11-20 22:50:02,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:02,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 22:50:02,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:02,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 22:50:02,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2021-11-20 22:50:02,376 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 24 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (18), 9 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-20 22:50:02,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:02,639 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-11-20 22:50:02,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:50:02,642 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (18), 9 states have call predecessors, (18), 12 states have call successors, (18) Word has length 51 [2021-11-20 22:50:02,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:02,644 INFO L225 Difference]: With dead ends: 42 [2021-11-20 22:50:02,644 INFO L226 Difference]: Without dead ends: 38 [2021-11-20 22:50:02,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=346, Invalid=776, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 22:50:02,646 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 44 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:02,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 67 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:02,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-20 22:50:02,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-20 22:50:02,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 25 states have (on average 1.04) internal successors, (26), 26 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-20 22:50:02,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-11-20 22:50:02,660 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 51 [2021-11-20 22:50:02,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:02,661 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-11-20 22:50:02,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (18), 9 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-20 22:50:02,661 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-11-20 22:50:02,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-20 22:50:02,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:02,663 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:02,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:02,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:02,871 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:02,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:02,871 INFO L85 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 5 times [2021-11-20 22:50:02,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:02,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770300671] [2021-11-20 22:50:02,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:02,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:02,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:03,094 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 143 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-20 22:50:03,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:03,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770300671] [2021-11-20 22:50:03,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770300671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:03,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831058439] [2021-11-20 22:50:03,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:03,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:03,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:03,095 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:03,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:50:03,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 22:50:03,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:03,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 22:50:03,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-20 22:50:03,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:06,863 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 22:50:06,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831058439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:06,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825292874] [2021-11-20 22:50:06,865 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:50:06,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:06,866 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) [2021-11-20 22:50:06,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:06,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 23] total 28 [2021-11-20 22:50:06,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400030350] [2021-11-20 22:50:06,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:06,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 22:50:06,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:06,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 22:50:06,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=570, Unknown=0, NotChecked=0, Total=756 [2021-11-20 22:50:06,869 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 28 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (22), 11 states have call predecessors, (22), 14 states have call successors, (22) [2021-11-20 22:50:07,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:07,146 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-20 22:50:07,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 22:50:07,147 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (22), 11 states have call predecessors, (22), 14 states have call successors, (22) Word has length 63 [2021-11-20 22:50:07,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:07,148 INFO L225 Difference]: With dead ends: 48 [2021-11-20 22:50:07,148 INFO L226 Difference]: Without dead ends: 44 [2021-11-20 22:50:07,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=486, Invalid=1074, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 22:50:07,152 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 124 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:07,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 75 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:07,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-20 22:50:07,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-20 22:50:07,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 30 states have internal predecessors, (30), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-20 22:50:07,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-11-20 22:50:07,160 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 63 [2021-11-20 22:50:07,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:07,161 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-11-20 22:50:07,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (22), 11 states have call predecessors, (22), 14 states have call successors, (22) [2021-11-20 22:50:07,161 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-11-20 22:50:07,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-20 22:50:07,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:07,164 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:07,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:07,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:07,383 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:07,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:07,383 INFO L85 PathProgramCache]: Analyzing trace with hash -776930930, now seen corresponding path program 6 times [2021-11-20 22:50:07,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:07,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907890287] [2021-11-20 22:50:07,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:07,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:07,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:07,631 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-11-20 22:50:07,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:07,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907890287] [2021-11-20 22:50:07,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907890287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:07,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829082731] [2021-11-20 22:50:07,632 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:50:07,632 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:07,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:07,632 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:07,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 22:50:07,788 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:50:07,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:07,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 22:50:07,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:08,022 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-11-20 22:50:08,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:13,194 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-20 22:50:13,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829082731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:13,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335326074] [2021-11-20 22:50:13,198 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:50:13,198 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:13,199 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) [2021-11-20 22:50:13,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:13,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 27] total 32 [2021-11-20 22:50:13,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339673714] [2021-11-20 22:50:13,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:13,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 22:50:13,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:13,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 22:50:13,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=748, Unknown=0, NotChecked=0, Total=992 [2021-11-20 22:50:13,204 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 32 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) [2021-11-20 22:50:13,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:13,504 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-11-20 22:50:13,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 22:50:13,505 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) Word has length 75 [2021-11-20 22:50:13,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:13,506 INFO L225 Difference]: With dead ends: 54 [2021-11-20 22:50:13,506 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 22:50:13,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=650, Invalid=1420, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 22:50:13,509 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 63 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:13,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 90 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:13,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 22:50:13,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-20 22:50:13,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 34 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-20 22:50:13,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-11-20 22:50:13,518 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 75 [2021-11-20 22:50:13,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:13,519 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-11-20 22:50:13,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) [2021-11-20 22:50:13,519 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-11-20 22:50:13,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 22:50:13,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:13,523 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:13,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:13,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 22:50:13,731 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:13,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:13,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1570097358, now seen corresponding path program 7 times [2021-11-20 22:50:13,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:13,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304728317] [2021-11-20 22:50:13,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:13,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:13,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:13,995 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 285 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-20 22:50:13,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:13,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304728317] [2021-11-20 22:50:13,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304728317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:13,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601438000] [2021-11-20 22:50:13,995 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:50:13,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:13,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:13,996 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:13,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 22:50:14,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:14,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 22:50:14,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-20 22:50:14,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:22,050 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-20 22:50:22,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601438000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:22,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990737714] [2021-11-20 22:50:22,052 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:50:22,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:22,053 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) [2021-11-20 22:50:22,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:22,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 31] total 36 [2021-11-20 22:50:22,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761392763] [2021-11-20 22:50:22,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:22,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 22:50:22,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:22,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 22:50:22,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=950, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 22:50:22,057 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 36 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 18 states have call successors, (18), 1 states have call predecessors, (18), 15 states have return successors, (30), 15 states have call predecessors, (30), 18 states have call successors, (30) [2021-11-20 22:50:22,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:22,476 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-11-20 22:50:22,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 22:50:22,477 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 18 states have call successors, (18), 1 states have call predecessors, (18), 15 states have return successors, (30), 15 states have call predecessors, (30), 18 states have call successors, (30) Word has length 87 [2021-11-20 22:50:22,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:22,479 INFO L225 Difference]: With dead ends: 60 [2021-11-20 22:50:22,479 INFO L226 Difference]: Without dead ends: 56 [2021-11-20 22:50:22,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=838, Invalid=1814, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 22:50:22,482 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 417 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:22,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [418 Valid, 87 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:22,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-20 22:50:22,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-20 22:50:22,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.027027027027027) internal successors, (38), 38 states have internal predecessors, (38), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-20 22:50:22,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-11-20 22:50:22,490 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 87 [2021-11-20 22:50:22,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:22,490 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-11-20 22:50:22,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 18 states have call successors, (18), 1 states have call predecessors, (18), 15 states have return successors, (30), 15 states have call predecessors, (30), 18 states have call successors, (30) [2021-11-20 22:50:22,491 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-11-20 22:50:22,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-20 22:50:22,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:22,493 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:22,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:22,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 22:50:22,715 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:22,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:22,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1758730226, now seen corresponding path program 8 times [2021-11-20 22:50:22,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:22,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658766417] [2021-11-20 22:50:22,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:22,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:22,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:23,403 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-20 22:50:23,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:23,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658766417] [2021-11-20 22:50:23,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658766417] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:23,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118820533] [2021-11-20 22:50:23,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:23,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:23,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:23,411 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:23,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 22:50:23,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 22:50:23,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:23,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-20 22:50:23,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:24,180 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-20 22:50:24,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:26,039 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-20 22:50:26,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118820533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:26,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1303112345] [2021-11-20 22:50:26,041 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 22:50:26,041 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:26,041 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) [2021-11-20 22:50:26,042 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:26,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2021-11-20 22:50:26,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353009229] [2021-11-20 22:50:26,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:26,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 22:50:26,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:26,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 22:50:26,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 22:50:26,045 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 19 states have internal predecessors, (38), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-11-20 22:50:26,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:26,416 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2021-11-20 22:50:26,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 22:50:26,417 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 19 states have internal predecessors, (38), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) Word has length 99 [2021-11-20 22:50:26,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:26,418 INFO L225 Difference]: With dead ends: 63 [2021-11-20 22:50:26,419 INFO L226 Difference]: Without dead ends: 59 [2021-11-20 22:50:26,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 193 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 22:50:26,420 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 1078 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1087 SdHoareTripleChecker+Invalid, 804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:26,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1087 Invalid, 804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 22:50:26,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-20 22:50:26,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-20 22:50:26,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 40 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-20 22:50:26,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-20 22:50:26,429 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 99 [2021-11-20 22:50:26,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:26,430 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-20 22:50:26,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 19 states have internal predecessors, (38), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-11-20 22:50:26,430 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-20 22:50:26,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-20 22:50:26,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:26,433 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:26,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:26,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 22:50:26,659 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:26,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:26,659 INFO L85 PathProgramCache]: Analyzing trace with hash -1678126652, now seen corresponding path program 9 times [2021-11-20 22:50:26,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:26,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837172556] [2021-11-20 22:50:26,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:26,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:26,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:26,923 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 345 proven. 78 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2021-11-20 22:50:26,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:26,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837172556] [2021-11-20 22:50:26,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837172556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:26,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975706916] [2021-11-20 22:50:26,924 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:50:26,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:26,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:26,924 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:26,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 22:50:27,234 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:50:27,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:27,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 22:50:27,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:27,563 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-11-20 22:50:27,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:27,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975706916] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:27,564 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:27,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [22] total 24 [2021-11-20 22:50:27,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220592972] [2021-11-20 22:50:27,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:27,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 22:50:27,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:27,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 22:50:27,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2021-11-20 22:50:27,568 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-20 22:50:27,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:27,817 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2021-11-20 22:50:27,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 22:50:27,817 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 2 states have call successors, (17) Word has length 105 [2021-11-20 22:50:27,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:27,818 INFO L225 Difference]: With dead ends: 59 [2021-11-20 22:50:27,818 INFO L226 Difference]: Without dead ends: 0 [2021-11-20 22:50:27,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=524, Invalid=1116, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 22:50:27,820 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 4 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:27,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 166 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:27,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-20 22:50:27,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-20 22:50:27,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:27,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-20 22:50:27,821 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 105 [2021-11-20 22:50:27,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:27,821 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-20 22:50:27,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-20 22:50:27,822 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-20 22:50:27,822 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-20 22:50:27,829 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-20 22:50:27,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:28,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 22:50:28,055 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-20 22:50:28,066 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-20 22:50:28,067 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-20 22:50:28,067 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 15) no Hoare annotation was computed. [2021-11-20 22:50:28,067 INFO L858 garLoopResultBuilder]: For program point L15(line 15) no Hoare annotation was computed. [2021-11-20 22:50:28,067 INFO L858 garLoopResultBuilder]: For program point L14(lines 14 16) no Hoare annotation was computed. [2021-11-20 22:50:28,067 INFO L854 garLoopResultBuilder]: At program point L13(line 13) the Hoare annotation is: (= |ULTIMATE.start_main_~input~0#1| 15) [2021-11-20 22:50:28,068 INFO L858 garLoopResultBuilder]: For program point L13-1(line 13) no Hoare annotation was computed. [2021-11-20 22:50:28,068 INFO L858 garLoopResultBuilder]: For program point L11(lines 11 17) no Hoare annotation was computed. [2021-11-20 22:50:28,068 INFO L858 garLoopResultBuilder]: For program point idFINAL(lines 6 9) no Hoare annotation was computed. [2021-11-20 22:50:28,068 INFO L858 garLoopResultBuilder]: For program point idEXIT(lines 6 9) no Hoare annotation was computed. [2021-11-20 22:50:28,068 INFO L854 garLoopResultBuilder]: At program point L8(line 8) the Hoare annotation is: (= |id_#in~x| id_~x) [2021-11-20 22:50:28,069 INFO L861 garLoopResultBuilder]: At program point idENTRY(lines 6 9) the Hoare annotation is: true [2021-11-20 22:50:28,069 INFO L858 garLoopResultBuilder]: For program point L7(line 7) no Hoare annotation was computed. [2021-11-20 22:50:28,069 INFO L858 garLoopResultBuilder]: For program point L8-1(line 8) no Hoare annotation was computed. [2021-11-20 22:50:28,072 INFO L732 BasicCegarLoop]: Path program histogram: [9, 1] [2021-11-20 22:50:28,074 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-20 22:50:28,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 10:50:28 BoogieIcfgContainer [2021-11-20 22:50:28,078 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-20 22:50:28,078 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-20 22:50:28,079 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-20 22:50:28,079 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-20 22:50:28,079 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:54" (3/4) ... [2021-11-20 22:50:28,082 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-20 22:50:28,088 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2021-11-20 22:50:28,092 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2021-11-20 22:50:28,092 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-11-20 22:50:28,092 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-20 22:50:28,092 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-20 22:50:28,121 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/witness.graphml [2021-11-20 22:50:28,121 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-20 22:50:28,121 INFO L158 Benchmark]: Toolchain (without parser) took 33721.49ms. Allocated memory was 92.3MB in the beginning and 255.9MB in the end (delta: 163.6MB). Free memory was 56.0MB in the beginning and 183.5MB in the end (delta: -127.5MB). Peak memory consumption was 36.1MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,122 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 92.3MB. Free memory was 72.1MB in the beginning and 72.1MB in the end (delta: 42.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:50:28,122 INFO L158 Benchmark]: CACSL2BoogieTranslator took 233.74ms. Allocated memory was 92.3MB in the beginning and 117.4MB in the end (delta: 25.2MB). Free memory was 55.8MB in the beginning and 94.2MB in the end (delta: -38.4MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,123 INFO L158 Benchmark]: Boogie Procedure Inliner took 30.25ms. Allocated memory is still 117.4MB. Free memory was 94.2MB in the beginning and 92.6MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,123 INFO L158 Benchmark]: Boogie Preprocessor took 16.88ms. Allocated memory is still 117.4MB. Free memory was 92.6MB in the beginning and 91.9MB in the end (delta: 749.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:50:28,123 INFO L158 Benchmark]: RCFGBuilder took 235.01ms. Allocated memory is still 117.4MB. Free memory was 91.9MB in the beginning and 83.3MB in the end (delta: 8.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,124 INFO L158 Benchmark]: TraceAbstraction took 33156.30ms. Allocated memory was 117.4MB in the beginning and 255.9MB in the end (delta: 138.4MB). Free memory was 82.8MB in the beginning and 186.7MB in the end (delta: -103.9MB). Peak memory consumption was 36.6MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,124 INFO L158 Benchmark]: Witness Printer took 42.52ms. Allocated memory is still 255.9MB. Free memory was 186.7MB in the beginning and 183.5MB in the end (delta: 3.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-20 22:50:28,126 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 92.3MB. Free memory was 72.1MB in the beginning and 72.1MB in the end (delta: 42.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 233.74ms. Allocated memory was 92.3MB in the beginning and 117.4MB in the end (delta: 25.2MB). Free memory was 55.8MB in the beginning and 94.2MB in the end (delta: -38.4MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 30.25ms. Allocated memory is still 117.4MB. Free memory was 94.2MB in the beginning and 92.6MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 16.88ms. Allocated memory is still 117.4MB. Free memory was 92.6MB in the beginning and 91.9MB in the end (delta: 749.2kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 235.01ms. Allocated memory is still 117.4MB. Free memory was 91.9MB in the beginning and 83.3MB in the end (delta: 8.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 33156.30ms. Allocated memory was 117.4MB in the beginning and 255.9MB in the end (delta: 138.4MB). Free memory was 82.8MB in the beginning and 186.7MB in the end (delta: -103.9MB). Peak memory consumption was 36.6MB. Max. memory is 16.1GB. * Witness Printer took 42.52ms. Allocated memory is still 255.9MB. Free memory was 186.7MB in the beginning and 183.5MB in the end (delta: 3.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 15]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 33.1s, OverallIterations: 10, TraceHistogramMax: 17, PathProgramHistogramMax: 9, EmptinessCheckTime: 0.0s, AutomataDifference: 2.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 778 SdHoareTripleChecker+Valid, 1.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 767 mSDsluCounter, 1729 SdHoareTripleChecker+Invalid, 0.8s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1700 mSDsCounter, 387 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1416 IncrementalHoareTripleChecker+Invalid, 1803 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 387 mSolverCounterUnsat, 141 mSDtfsCounter, 1416 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1298 GetRequests, 993 SyntacticMatches, 5 SemanticMatches, 300 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1251 ImplicationChecksByTransitivity, 3.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=9, InterpolantAutomatonStates: 152, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 5 PreInvPairs, 5 NumberOfFragments, 7 HoareAnnotationTreeSize, 5 FomulaSimplifications, 32 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 26.3s InterpolantComputationTime, 1131 NumberOfCodeBlocks, 1131 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1560 ConstructedInterpolants, 0 QuantifiedInterpolants, 4896 SizeOfPredicates, 74 NumberOfNonLiveVariables, 1534 ConjunctsInSsa, 229 ConjunctsInUnsatCore, 27 InterpolantComputations, 2 PerfectInterpolantSequences, 4100/7880 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-20 22:50:28,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_839948e5-be3d-4f01-a4e0-d7ca90395d89/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE