./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 e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/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_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw --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 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-20 06:28:44,586 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-20 06:28:44,589 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-20 06:28:44,621 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-20 06:28:44,621 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-20 06:28:44,623 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-20 06:28:44,625 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-20 06:28:44,627 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-20 06:28:44,629 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-20 06:28:44,631 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-20 06:28:44,632 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-20 06:28:44,634 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-20 06:28:44,634 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-20 06:28:44,636 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-20 06:28:44,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-20 06:28:44,640 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-20 06:28:44,641 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-20 06:28:44,642 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-20 06:28:44,645 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-20 06:28:44,647 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-20 06:28:44,650 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-20 06:28:44,651 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-20 06:28:44,653 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-20 06:28:44,654 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-20 06:28:44,658 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-20 06:28:44,659 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-20 06:28:44,659 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-20 06:28:44,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-20 06:28:44,661 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-20 06:28:44,663 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-20 06:28:44,663 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-20 06:28:44,664 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-20 06:28:44,665 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-20 06:28:44,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-20 06:28:44,668 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-20 06:28:44,668 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-20 06:28:44,669 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-20 06:28:44,669 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-20 06:28:44,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-20 06:28:44,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-20 06:28:44,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-20 06:28:44,673 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-20 06:28:44,711 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-20 06:28:44,712 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-20 06:28:44,713 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-20 06:28:44,713 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-20 06:28:44,714 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-20 06:28:44,714 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-20 06:28:44,714 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-20 06:28:44,715 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-20 06:28:44,715 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-20 06:28:44,716 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-20 06:28:44,716 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-20 06:28:44,716 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-20 06:28:44,717 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-20 06:28:44,717 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-20 06:28:44,718 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-20 06:28:44,719 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-20 06:28:44,719 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-20 06:28:44,719 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-20 06:28:44,719 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-20 06:28:44,720 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-20 06:28:44,720 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-20 06:28:44,720 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-20 06:28:44,720 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-20 06:28:44,721 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-20 06:28:44,721 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-20 06:28:44,721 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-20 06:28:44,721 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-20 06:28:44,721 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-20 06:28:44,722 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-20 06:28:44,722 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-20 06:28:44,722 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 06:28:44,723 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-20 06:28:44,723 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-20 06:28:44,723 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-20 06:28:44,723 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-20 06:28:44,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-20 06:28:44,724 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-20 06:28:44,724 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-20 06:28:44,724 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-20 06:28:44,724 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_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 715908359373978289cc76ce2f00faf49f4d4a3c6ddae64771646fc969bea981 [2021-10-20 06:28:44,991 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-20 06:28:45,030 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-20 06:28:45,032 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-20 06:28:45,034 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-20 06:28:45,034 INFO L275 PluginConnector]: CDTParser initialized [2021-10-20 06:28:45,035 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/../../sv-benchmarks/c/recursive-simple/id_i15_o15-1.c [2021-10-20 06:28:45,121 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/data/1c6b78f62/6f895b8c05fb42b4b5c8b9f4921f0b20/FLAGd794d892d [2021-10-20 06:28:45,572 INFO L306 CDTParser]: Found 1 translation units. [2021-10-20 06:28:45,572 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c [2021-10-20 06:28:45,578 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/data/1c6b78f62/6f895b8c05fb42b4b5c8b9f4921f0b20/FLAGd794d892d [2021-10-20 06:28:45,973 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/data/1c6b78f62/6f895b8c05fb42b4b5c8b9f4921f0b20 [2021-10-20 06:28:45,976 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-20 06:28:45,977 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-20 06:28:45,979 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-20 06:28:45,979 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-20 06:28:45,981 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-20 06:28:45,982 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:28:45" (1/1) ... [2021-10-20 06:28:45,983 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ea3a4f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:45, skipping insertion in model container [2021-10-20 06:28:45,983 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:28:45" (1/1) ... [2021-10-20 06:28:45,990 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-20 06:28:46,003 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-20 06:28:46,140 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c[454,467] [2021-10-20 06:28:46,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 06:28:46,178 INFO L203 MainTranslator]: Completed pre-run [2021-10-20 06:28:46,191 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/sv-benchmarks/c/recursive-simple/id_i15_o15-1.c[454,467] [2021-10-20 06:28:46,191 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 06:28:46,204 INFO L208 MainTranslator]: Completed translation [2021-10-20 06:28:46,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46 WrapperNode [2021-10-20 06:28:46,205 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-20 06:28:46,206 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-20 06:28:46,206 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-20 06:28:46,206 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-20 06:28:46,212 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,218 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,233 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-20 06:28:46,234 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-20 06:28:46,234 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-20 06:28:46,234 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-20 06:28:46,243 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,245 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-20 06:28:46,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-20 06:28:46,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-20 06:28:46,253 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-20 06:28:46,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (1/1) ... [2021-10-20 06:28:46,270 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 06:28:46,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:46,296 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-20 06:28:46,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-20 06:28:46,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-20 06:28:46,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-20 06:28:46,339 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-20 06:28:46,339 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-10-20 06:28:46,339 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-10-20 06:28:46,339 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-20 06:28:46,549 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-20 06:28:46,550 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-20 06:28:46,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:28:46 BoogieIcfgContainer [2021-10-20 06:28:46,553 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-20 06:28:46,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-20 06:28:46,555 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-20 06:28:46,559 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-20 06:28:46,559 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 06:28:45" (1/3) ... [2021-10-20 06:28:46,560 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@212b185c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 06:28:46, skipping insertion in model container [2021-10-20 06:28:46,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:28:46" (2/3) ... [2021-10-20 06:28:46,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@212b185c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 06:28:46, skipping insertion in model container [2021-10-20 06:28:46,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:28:46" (3/3) ... [2021-10-20 06:28:46,563 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-1.c [2021-10-20 06:28:46,569 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-20 06:28:46,569 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-20 06:28:46,615 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-20 06:28:46,623 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 [2021-10-20 06:28:46,623 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-20 06:28:46,641 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) [2021-10-20 06:28:46,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-20 06:28:46,646 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:46,647 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:46,648 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:46,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:46,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2021-10-20 06:28:46,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:46,665 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406346073] [2021-10-20 06:28:46,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:46,668 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:46,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:46,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 06:28:46,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:46,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406346073] [2021-10-20 06:28:46,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406346073] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-20 06:28:46,873 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-20 06:28:46,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-20 06:28:46,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819349049] [2021-10-20 06:28:46,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-20 06:28:46,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:46,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-20 06:28:46,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-20 06:28:46,932 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) [2021-10-20 06:28:47,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:47,020 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-10-20 06:28:47,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-20 06:28:47,022 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 [2021-10-20 06:28:47,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:47,032 INFO L225 Difference]: With dead ends: 22 [2021-10-20 06:28:47,032 INFO L226 Difference]: Without dead ends: 14 [2021-10-20 06:28:47,036 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.1ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-20 06:28:47,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-10-20 06:28:47,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-10-20 06:28:47,107 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) [2021-10-20 06:28:47,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-10-20 06:28:47,110 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-10-20 06:28:47,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:47,110 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-10-20 06:28:47,111 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) [2021-10-20 06:28:47,111 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-10-20 06:28:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-20 06:28:47,127 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:47,127 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:47,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-20 06:28:47,128 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:47,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:47,129 INFO L82 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2021-10-20 06:28:47,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:47,130 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178478005] [2021-10-20 06:28:47,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:47,130 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:47,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:47,270 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-20 06:28:47,270 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:47,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178478005] [2021-10-20 06:28:47,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178478005] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:28:47,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664259714] [2021-10-20 06:28:47,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:47,272 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:47,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:47,274 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:28:47,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-20 06:28:47,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:47,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-20 06:28:47,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:28:47,615 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-20 06:28:47,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:28:47,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-20 06:28:47,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664259714] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:28:47,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1635028578] [2021-10-20 06:28:47,897 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:28:47,898 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:28:47,913 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:608) 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) [2021-10-20 06:28:47,921 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:28:47,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 12 [2021-10-20 06:28:47,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566607783] [2021-10-20 06:28:47,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-20 06:28:47,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:47,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-20 06:28:47,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-10-20 06:28:47,930 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) [2021-10-20 06:28:48,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:48,100 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-10-20 06:28:48,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-20 06:28:48,101 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 [2021-10-20 06:28:48,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:48,104 INFO L225 Difference]: With dead ends: 24 [2021-10-20 06:28:48,108 INFO L226 Difference]: Without dead ends: 20 [2021-10-20 06:28:48,111 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 183.8ms TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2021-10-20 06:28:48,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-10-20 06:28:48,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-10-20 06:28:48,124 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) [2021-10-20 06:28:48,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-10-20 06:28:48,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2021-10-20 06:28:48,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:48,129 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-10-20 06:28:48,137 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) [2021-10-20 06:28:48,137 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-10-20 06:28:48,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-10-20 06:28:48,140 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:48,141 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:48,177 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-20 06:28:48,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:48,363 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:48,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:48,364 INFO L82 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 2 times [2021-10-20 06:28:48,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:48,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487080829] [2021-10-20 06:28:48,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:48,365 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:48,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:48,555 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-20 06:28:48,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:48,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487080829] [2021-10-20 06:28:48,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487080829] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:28:48,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860124854] [2021-10-20 06:28:48,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-20 06:28:48,558 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:48,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:48,559 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:28:48,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-20 06:28:48,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-20 06:28:48,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:28:48,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-20 06:28:48,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:28:48,829 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-20 06:28:48,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:28:49,490 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-20 06:28:49,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860124854] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:28:49,491 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205545478] [2021-10-20 06:28:49,493 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:28:49,494 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:28:49,494 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:608) 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) [2021-10-20 06:28:49,494 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:28:49,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11] total 16 [2021-10-20 06:28:49,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075104904] [2021-10-20 06:28:49,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-20 06:28:49,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:49,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-20 06:28:49,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-10-20 06:28:49,497 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) [2021-10-20 06:28:49,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:49,655 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-10-20 06:28:49,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-20 06:28:49,655 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 [2021-10-20 06:28:49,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:49,656 INFO L225 Difference]: With dead ends: 30 [2021-10-20 06:28:49,656 INFO L226 Difference]: Without dead ends: 26 [2021-10-20 06:28:49,657 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 222.9ms TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-10-20 06:28:49,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-20 06:28:49,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-20 06:28:49,662 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) [2021-10-20 06:28:49,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-10-20 06:28:49,663 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 27 [2021-10-20 06:28:49,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:49,664 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-10-20 06:28:49,664 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) [2021-10-20 06:28:49,665 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-10-20 06:28:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-20 06:28:49,667 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:49,668 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:49,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-10-20 06:28:49,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:49,883 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:49,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:49,884 INFO L82 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 3 times [2021-10-20 06:28:49,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:49,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629526892] [2021-10-20 06:28:49,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:49,885 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:50,126 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-10-20 06:28:50,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:50,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629526892] [2021-10-20 06:28:50,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629526892] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:28:50,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258653577] [2021-10-20 06:28:50,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-20 06:28:50,127 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:50,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:50,129 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:28:50,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-20 06:28:50,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-20 06:28:50,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:28:50,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-20 06:28:50,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:28:50,412 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-10-20 06:28:50,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:28:51,601 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-20 06:28:51,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258653577] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:28:51,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358445234] [2021-10-20 06:28:51,607 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:28:51,608 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:28:51,609 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:608) 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) [2021-10-20 06:28:51,610 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:28:51,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 15] total 20 [2021-10-20 06:28:51,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065725394] [2021-10-20 06:28:51,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-10-20 06:28:51,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:51,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-10-20 06:28:51,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2021-10-20 06:28:51,614 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) [2021-10-20 06:28:51,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:51,796 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-10-20 06:28:51,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-20 06:28:51,799 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 [2021-10-20 06:28:51,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:51,800 INFO L225 Difference]: With dead ends: 36 [2021-10-20 06:28:51,800 INFO L226 Difference]: Without dead ends: 32 [2021-10-20 06:28:51,801 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 292.6ms TimeCoverageRelationStatistics Valid=230, Invalid=526, Unknown=0, NotChecked=0, Total=756 [2021-10-20 06:28:51,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-10-20 06:28:51,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-10-20 06:28:51,806 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) [2021-10-20 06:28:51,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-10-20 06:28:51,808 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 39 [2021-10-20 06:28:51,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:51,808 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-10-20 06:28:51,809 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) [2021-10-20 06:28:51,809 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-10-20 06:28:51,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-10-20 06:28:51,811 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:51,811 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:51,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-20 06:28:52,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:52,023 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:52,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:52,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 4 times [2021-10-20 06:28:52,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:52,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873515050] [2021-10-20 06:28:52,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:52,024 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:52,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:52,213 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-10-20 06:28:52,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:52,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873515050] [2021-10-20 06:28:52,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873515050] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:28:52,214 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090089598] [2021-10-20 06:28:52,214 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-20 06:28:52,214 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:52,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:52,216 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:28:52,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-20 06:28:52,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:52,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-20 06:28:52,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:28:52,605 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-10-20 06:28:52,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:28:54,799 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-10-20 06:28:54,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090089598] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:28:54,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [596201815] [2021-10-20 06:28:54,801 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:28:54,802 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:28:54,802 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) 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) [2021-10-20 06:28:54,802 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:28:54,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 19] total 24 [2021-10-20 06:28:54,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032211340] [2021-10-20 06:28:54,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-20 06:28:54,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:54,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-20 06:28:54,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2021-10-20 06:28:54,805 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) [2021-10-20 06:28:55,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:55,046 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-10-20 06:28:55,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-20 06:28:55,047 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 [2021-10-20 06:28:55,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:55,049 INFO L225 Difference]: With dead ends: 42 [2021-10-20 06:28:55,049 INFO L226 Difference]: Without dead ends: 38 [2021-10-20 06:28:55,050 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 370.5ms TimeCoverageRelationStatistics Valid=346, Invalid=776, Unknown=0, NotChecked=0, Total=1122 [2021-10-20 06:28:55,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-20 06:28:55,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-20 06:28:55,056 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) [2021-10-20 06:28:55,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-10-20 06:28:55,058 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 51 [2021-10-20 06:28:55,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:55,058 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-10-20 06:28:55,058 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) [2021-10-20 06:28:55,059 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-10-20 06:28:55,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-10-20 06:28:55,061 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:55,061 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:55,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-20 06:28:55,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:55,261 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:28:55,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:28:55,262 INFO L82 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 5 times [2021-10-20 06:28:55,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:28:55,262 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594207184] [2021-10-20 06:28:55,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:28:55,262 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:28:55,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:28:55,508 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 143 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-10-20 06:28:55,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:28:55,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594207184] [2021-10-20 06:28:55,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594207184] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:28:55,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726983255] [2021-10-20 06:28:55,508 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-20 06:28:55,508 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:28:55,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:28:55,509 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:28:55,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-20 06:28:55,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-10-20 06:28:55,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:28:55,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-20 06:28:55,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:28:55,924 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-10-20 06:28:55,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:28:59,471 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-10-20 06:28:59,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726983255] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:28:59,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609559064] [2021-10-20 06:28:59,476 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:28:59,476 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:28:59,476 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:608) 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) [2021-10-20 06:28:59,477 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:28:59,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 23] total 28 [2021-10-20 06:28:59,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578001749] [2021-10-20 06:28:59,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-10-20 06:28:59,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:28:59,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-10-20 06:28:59,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=570, Unknown=0, NotChecked=0, Total=756 [2021-10-20 06:28:59,481 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) [2021-10-20 06:28:59,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:28:59,783 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-10-20 06:28:59,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-20 06:28:59,785 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 [2021-10-20 06:28:59,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:28:59,786 INFO L225 Difference]: With dead ends: 48 [2021-10-20 06:28:59,787 INFO L226 Difference]: Without dead ends: 44 [2021-10-20 06:28:59,788 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 459.8ms TimeCoverageRelationStatistics Valid=486, Invalid=1074, Unknown=0, NotChecked=0, Total=1560 [2021-10-20 06:28:59,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-20 06:28:59,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-10-20 06:28:59,795 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) [2021-10-20 06:28:59,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-10-20 06:28:59,796 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 63 [2021-10-20 06:28:59,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:28:59,797 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-10-20 06:28:59,797 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) [2021-10-20 06:28:59,797 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-10-20 06:28:59,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-10-20 06:28:59,799 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:28:59,800 INFO L512 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:28:59,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-20 06:29:00,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:00,015 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:29:00,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:29:00,016 INFO L82 PathProgramCache]: Analyzing trace with hash -776930930, now seen corresponding path program 6 times [2021-10-20 06:29:00,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:29:00,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040535932] [2021-10-20 06:29:00,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:29:00,016 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:29:00,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:29:00,291 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-10-20 06:29:00,291 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:29:00,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040535932] [2021-10-20 06:29:00,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040535932] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:29:00,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734724285] [2021-10-20 06:29:00,292 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-20 06:29:00,292 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:00,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:29:00,295 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:29:00,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-20 06:29:00,574 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-20 06:29:00,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:29:00,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-20 06:29:00,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:29:00,875 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-10-20 06:29:00,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:29:06,375 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-10-20 06:29:06,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734724285] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:29:06,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [748204355] [2021-10-20 06:29:06,377 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:29:06,378 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:29:06,378 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:608) 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) [2021-10-20 06:29:06,379 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:29:06,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 27] total 32 [2021-10-20 06:29:06,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491602108] [2021-10-20 06:29:06,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-10-20 06:29:06,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:29:06,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-10-20 06:29:06,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=748, Unknown=0, NotChecked=0, Total=992 [2021-10-20 06:29:06,382 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) [2021-10-20 06:29:06,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:29:06,694 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-10-20 06:29:06,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-20 06:29:06,696 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 [2021-10-20 06:29:06,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:29:06,698 INFO L225 Difference]: With dead ends: 54 [2021-10-20 06:29:06,698 INFO L226 Difference]: Without dead ends: 50 [2021-10-20 06:29:06,700 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 556.5ms TimeCoverageRelationStatistics Valid=650, Invalid=1420, Unknown=0, NotChecked=0, Total=2070 [2021-10-20 06:29:06,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-20 06:29:06,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-20 06:29:06,707 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) [2021-10-20 06:29:06,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-10-20 06:29:06,708 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 75 [2021-10-20 06:29:06,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:29:06,709 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-10-20 06:29:06,709 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) [2021-10-20 06:29:06,710 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-10-20 06:29:06,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-10-20 06:29:06,712 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:29:06,712 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:29:06,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-20 06:29:06,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:06,927 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:29:06,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:29:06,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1570097358, now seen corresponding path program 7 times [2021-10-20 06:29:06,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:29:06,928 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756872212] [2021-10-20 06:29:06,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:29:06,928 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:29:06,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:29:07,242 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 285 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-10-20 06:29:07,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:29:07,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756872212] [2021-10-20 06:29:07,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756872212] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:29:07,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891688776] [2021-10-20 06:29:07,243 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-20 06:29:07,243 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:07,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:29:07,244 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:29:07,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-20 06:29:07,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:29:07,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 30 conjunts are in the unsatisfiable core [2021-10-20 06:29:07,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:29:07,935 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-10-20 06:29:07,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:29:15,810 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-10-20 06:29:15,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891688776] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:29:15,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834283380] [2021-10-20 06:29:15,813 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:29:15,813 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:29:15,813 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java: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:608) 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) [2021-10-20 06:29:15,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:29:15,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 31] total 36 [2021-10-20 06:29:15,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876529585] [2021-10-20 06:29:15,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-10-20 06:29:15,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:29:15,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-10-20 06:29:15,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=950, Unknown=0, NotChecked=0, Total=1260 [2021-10-20 06:29:15,816 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) [2021-10-20 06:29:16,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:29:16,301 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-10-20 06:29:16,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-20 06:29:16,301 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 [2021-10-20 06:29:16,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:29:16,303 INFO L225 Difference]: With dead ends: 60 [2021-10-20 06:29:16,303 INFO L226 Difference]: Without dead ends: 56 [2021-10-20 06:29:16,304 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 674.0ms TimeCoverageRelationStatistics Valid=838, Invalid=1814, Unknown=0, NotChecked=0, Total=2652 [2021-10-20 06:29:16,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-10-20 06:29:16,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-10-20 06:29:16,314 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) [2021-10-20 06:29:16,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-10-20 06:29:16,315 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 87 [2021-10-20 06:29:16,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:29:16,316 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-10-20 06:29:16,316 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) [2021-10-20 06:29:16,316 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-10-20 06:29:16,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-10-20 06:29:16,319 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:29:16,319 INFO L512 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:29:16,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-20 06:29:16,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:16,542 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:29:16,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:29:16,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1758730226, now seen corresponding path program 8 times [2021-10-20 06:29:16,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:29:16,543 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878260490] [2021-10-20 06:29:16,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:29:16,543 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:29:16,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:29:17,256 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-10-20 06:29:17,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:29:17,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878260490] [2021-10-20 06:29:17,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878260490] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:29:17,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440166478] [2021-10-20 06:29:17,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-20 06:29:17,257 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:17,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:29:17,258 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:29:17,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-20 06:29:17,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-10-20 06:29:17,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:29:17,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 67 conjunts are in the unsatisfiable core [2021-10-20 06:29:17,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:29:18,344 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-10-20 06:29:18,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:29:20,339 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-10-20 06:29:20,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440166478] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 06:29:20,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860187310] [2021-10-20 06:29:20,342 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-20 06:29:20,343 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 06:29:20,343 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:608) 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) [2021-10-20 06:29:20,343 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 06:29:20,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2021-10-20 06:29:20,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137357507] [2021-10-20 06:29:20,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-10-20 06:29:20,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:29:20,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-10-20 06:29:20,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2021-10-20 06:29:20,351 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) [2021-10-20 06:29:20,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:29:20,874 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2021-10-20 06:29:20,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-10-20 06:29:20,874 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 [2021-10-20 06:29:20,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:29:20,876 INFO L225 Difference]: With dead ends: 63 [2021-10-20 06:29:20,876 INFO L226 Difference]: Without dead ends: 59 [2021-10-20 06:29:20,877 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 193 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 569.8ms TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2021-10-20 06:29:20,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-20 06:29:20,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-10-20 06:29:20,889 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) [2021-10-20 06:29:20,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-10-20 06:29:20,895 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 99 [2021-10-20 06:29:20,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:29:20,897 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-10-20 06:29:20,897 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) [2021-10-20 06:29:20,897 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-10-20 06:29:20,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-10-20 06:29:20,902 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 06:29:20,903 INFO L512 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 06:29:20,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-20 06:29:21,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-10-20 06:29:21,131 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 06:29:21,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 06:29:21,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1678126652, now seen corresponding path program 9 times [2021-10-20 06:29:21,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 06:29:21,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748769939] [2021-10-20 06:29:21,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 06:29:21,132 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 06:29:21,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 06:29:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 345 proven. 78 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2021-10-20 06:29:21,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 06:29:21,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748769939] [2021-10-20 06:29:21,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748769939] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 06:29:21,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143493214] [2021-10-20 06:29:21,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-20 06:29:21,487 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 06:29:21,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 06:29:21,489 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 06:29:21,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-20 06:29:22,151 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-20 06:29:22,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 06:29:22,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-20 06:29:22,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 06:29:22,518 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-10-20 06:29:22,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 06:29:37,027 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 256 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-10-20 06:29:37,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143493214] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-20 06:29:37,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-20 06:29:37,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [22, 37] total 41 [2021-10-20 06:29:37,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295910843] [2021-10-20 06:29:37,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-20 06:29:37,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 06:29:37,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-20 06:29:37,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=1252, Unknown=0, NotChecked=0, Total=1640 [2021-10-20 06:29:37,031 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) [2021-10-20 06:29:37,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 06:29:37,296 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2021-10-20 06:29:37,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-10-20 06:29:37,296 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 [2021-10-20 06:29:37,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 06:29:37,297 INFO L225 Difference]: With dead ends: 59 [2021-10-20 06:29:37,297 INFO L226 Difference]: Without dead ends: 0 [2021-10-20 06:29:37,299 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 708.9ms TimeCoverageRelationStatistics Valid=1018, Invalid=2288, Unknown=0, NotChecked=0, Total=3306 [2021-10-20 06:29:37,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-20 06:29:37,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-20 06:29:37,299 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) [2021-10-20 06:29:37,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-20 06:29:37,299 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 105 [2021-10-20 06:29:37,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 06:29:37,300 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-20 06:29:37,300 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) [2021-10-20 06:29:37,300 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-20 06:29:37,300 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-20 06:29:37,302 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 06:29:37,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-20 06:29:37,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-10-20 06:29:37,509 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-20 06:29:37,512 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 06:29:37,523 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 06:29:37,528 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 06:29:37,530 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 06:29:37,531 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 06:29:37,559 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-20 06:29:37,559 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-20 06:29:37,559 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 15) no Hoare annotation was computed. [2021-10-20 06:29:37,559 INFO L857 garLoopResultBuilder]: For program point L15(line 15) no Hoare annotation was computed. [2021-10-20 06:29:37,560 INFO L857 garLoopResultBuilder]: For program point L14(lines 14 16) no Hoare annotation was computed. [2021-10-20 06:29:37,560 INFO L853 garLoopResultBuilder]: At program point L13(line 13) the Hoare annotation is: (= 15 ULTIMATE.start_main_~input~0) [2021-10-20 06:29:37,560 INFO L857 garLoopResultBuilder]: For program point L13-1(line 13) no Hoare annotation was computed. [2021-10-20 06:29:37,560 INFO L857 garLoopResultBuilder]: For program point L11(lines 11 17) no Hoare annotation was computed. [2021-10-20 06:29:37,560 INFO L857 garLoopResultBuilder]: For program point idFINAL(lines 6 9) no Hoare annotation was computed. [2021-10-20 06:29:37,561 INFO L857 garLoopResultBuilder]: For program point idEXIT(lines 6 9) no Hoare annotation was computed. [2021-10-20 06:29:37,561 INFO L853 garLoopResultBuilder]: At program point L8(line 8) the Hoare annotation is: (= |id_#in~x| id_~x) [2021-10-20 06:29:37,561 INFO L860 garLoopResultBuilder]: At program point idENTRY(lines 6 9) the Hoare annotation is: true [2021-10-20 06:29:37,561 INFO L857 garLoopResultBuilder]: For program point L7(line 7) no Hoare annotation was computed. [2021-10-20 06:29:37,561 INFO L857 garLoopResultBuilder]: For program point L8-1(line 8) no Hoare annotation was computed. [2021-10-20 06:29:37,581 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-20 06:29:37,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 06:29:37 BoogieIcfgContainer [2021-10-20 06:29:37,589 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-20 06:29:37,590 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-20 06:29:37,590 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-20 06:29:37,590 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-20 06:29:37,591 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:28:46" (3/4) ... [2021-10-20 06:29:37,594 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-20 06:29:37,602 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2021-10-20 06:29:37,609 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2021-10-20 06:29:37,609 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-10-20 06:29:37,609 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-20 06:29:37,609 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-20 06:29:37,647 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/witness.graphml [2021-10-20 06:29:37,647 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-20 06:29:37,649 INFO L168 Benchmark]: Toolchain (without parser) took 51670.63 ms. Allocated memory was 117.4 MB in the beginning and 249.6 MB in the end (delta: 132.1 MB). Free memory was 83.3 MB in the beginning and 184.4 MB in the end (delta: -101.1 MB). Peak memory consumption was 32.1 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,650 INFO L168 Benchmark]: CDTParser took 0.96 ms. Allocated memory is still 79.7 MB. Free memory was 53.6 MB in the beginning and 53.6 MB in the end (delta: 29.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 06:29:37,651 INFO L168 Benchmark]: CACSL2BoogieTranslator took 226.26 ms. Allocated memory is still 117.4 MB. Free memory was 83.1 MB in the beginning and 95.7 MB in the end (delta: -12.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,651 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.82 ms. Allocated memory is still 117.4 MB. Free memory was 95.7 MB in the beginning and 94.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,652 INFO L168 Benchmark]: Boogie Preprocessor took 18.30 ms. Allocated memory is still 117.4 MB. Free memory was 94.2 MB in the beginning and 93.6 MB in the end (delta: 559.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 06:29:37,652 INFO L168 Benchmark]: RCFGBuilder took 299.56 ms. Allocated memory is still 117.4 MB. Free memory was 93.6 MB in the beginning and 83.7 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,653 INFO L168 Benchmark]: TraceAbstraction took 51034.66 ms. Allocated memory was 117.4 MB in the beginning and 249.6 MB in the end (delta: 132.1 MB). Free memory was 83.2 MB in the beginning and 186.5 MB in the end (delta: -103.3 MB). Peak memory consumption was 176.7 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,653 INFO L168 Benchmark]: Witness Printer took 57.17 ms. Allocated memory is still 249.6 MB. Free memory was 186.5 MB in the beginning and 184.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 06:29:37,656 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.96 ms. Allocated memory is still 79.7 MB. Free memory was 53.6 MB in the beginning and 53.6 MB in the end (delta: 29.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 226.26 ms. Allocated memory is still 117.4 MB. Free memory was 83.1 MB in the beginning and 95.7 MB in the end (delta: -12.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 27.82 ms. Allocated memory is still 117.4 MB. Free memory was 95.7 MB in the beginning and 94.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.30 ms. Allocated memory is still 117.4 MB. Free memory was 94.2 MB in the beginning and 93.6 MB in the end (delta: 559.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 299.56 ms. Allocated memory is still 117.4 MB. Free memory was 93.6 MB in the beginning and 83.7 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 51034.66 ms. Allocated memory was 117.4 MB in the beginning and 249.6 MB in the end (delta: 132.1 MB). Free memory was 83.2 MB in the beginning and 186.5 MB in the end (delta: -103.3 MB). Peak memory consumption was 176.7 MB. Max. memory is 16.1 GB. * Witness Printer took 57.17 ms. Allocated memory is still 249.6 MB. Free memory was 186.5 MB in the beginning and 184.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms 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: 50953.2ms, OverallIterations: 10, TraceHistogramMax: 17, EmptinessCheckTime: 46.5ms, AutomataDifference: 2845.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 51.1ms, InitialAbstractionConstructionTime: 13.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 152 SDtfs, 767 SDslu, 1700 SDs, 0 SdLazy, 1293 SolverSat, 387 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 958.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1402 GetRequests, 1078 SyntacticMatches, 7 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4083.5ms Time, 0.0ms 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, 0.0ms DumpTime, AutomataMinimizationStatistics: 120.9ms AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 3 LocationsWithAnnotation, 5 PreInvPairs, 5 NumberOfFragments, 7 HoareAnnotationTreeSize, 5 FomulaSimplifications, 14 FormulaSimplificationTreeSizeReduction, 20.2ms HoareSimplificationTime, 3 FomulaSimplificationsInter, 11 FormulaSimplificationTreeSizeReductionInter, 9.4ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 125.1ms SsaConstructionTime, 626.3ms SatisfiabilityAnalysisTime, 42540.6ms InterpolantComputationTime, 1131 NumberOfCodeBlocks, 1131 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1664 ConstructedInterpolants, 0 QuantifiedInterpolants, 5300 SizeOfPredicates, 74 NumberOfNonLiveVariables, 1588 ConjunctsInSsa, 229 ConjunctsInUnsatCore, 28 InterpolantComputations, 2 PerfectInterpolantSequences, 4628/8664 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! [2021-10-20 06:29:37,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a98e509-7eb0-45ff-88b3-c95e2ba900c0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...