./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_o20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o20.c -s /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan --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 a54fd98af675d3e485f3e615c8444fd8c5970ebc .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 06:05:30,649 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 06:05:30,651 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 06:05:30,680 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 06:05:30,681 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 06:05:30,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 06:05:30,688 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 06:05:30,690 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 06:05:30,692 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 06:05:30,693 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 06:05:30,695 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 06:05:30,696 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 06:05:30,696 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 06:05:30,698 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 06:05:30,699 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 06:05:30,700 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 06:05:30,701 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 06:05:30,702 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 06:05:30,704 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 06:05:30,706 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 06:05:30,707 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 06:05:30,709 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 06:05:30,710 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 06:05:30,710 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 06:05:30,713 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 06:05:30,714 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 06:05:30,714 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 06:05:30,715 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 06:05:30,716 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 06:05:30,717 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 06:05:30,717 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 06:05:30,718 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 06:05:30,719 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 06:05:30,719 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 06:05:30,720 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 06:05:30,721 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 06:05:30,721 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 06:05:30,721 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 06:05:30,722 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 06:05:30,722 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 06:05:30,723 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 06:05:30,723 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 06:05:30,745 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 06:05:30,746 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 06:05:30,746 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 06:05:30,747 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 06:05:30,747 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 06:05:30,747 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 06:05:30,747 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 06:05:30,747 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 06:05:30,747 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 06:05:30,748 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 06:05:30,748 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 06:05:30,748 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 06:05:30,748 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 06:05:30,748 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 06:05:30,749 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 06:05:30,749 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 06:05:30,749 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 06:05:30,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 06:05:30,750 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 06:05:30,751 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 06:05:30,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 06:05:30,751 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 06:05:30,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 06:05:30,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 06:05:30,751 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 06:05:30,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:05:30,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 06:05:30,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 06:05:30,752 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 06:05:30,752 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 06:05:30,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 06:05:30,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 06:05:30,753 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 06:05:30,753 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 06:05:30,753 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-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a54fd98af675d3e485f3e615c8444fd8c5970ebc [2020-12-09 06:05:30,937 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 06:05:30,955 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 06:05:30,957 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 06:05:30,958 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 06:05:30,959 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 06:05:30,959 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_o20.c [2020-12-09 06:05:31,000 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/data/46d2bc700/e0cf0a0f64ed4150aa7301f22527da5b/FLAG1a23a2281 [2020-12-09 06:05:31,365 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 06:05:31,365 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/sv-benchmarks/c/recursive-simple/id_o20.c [2020-12-09 06:05:31,370 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/data/46d2bc700/e0cf0a0f64ed4150aa7301f22527da5b/FLAG1a23a2281 [2020-12-09 06:05:31,380 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/data/46d2bc700/e0cf0a0f64ed4150aa7301f22527da5b [2020-12-09 06:05:31,382 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 06:05:31,384 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 06:05:31,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 06:05:31,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 06:05:31,388 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 06:05:31,388 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,390 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@272f7379 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31, skipping insertion in model container [2020-12-09 06:05:31,390 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,395 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 06:05:31,406 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 06:05:31,517 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2020-12-09 06:05:31,523 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:05:31,531 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 06:05:31,541 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2020-12-09 06:05:31,541 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:05:31,551 INFO L208 MainTranslator]: Completed translation [2020-12-09 06:05:31,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31 WrapperNode [2020-12-09 06:05:31,552 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 06:05:31,552 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 06:05:31,553 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 06:05:31,553 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 06:05:31,559 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,564 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,575 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 06:05:31,575 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 06:05:31,576 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 06:05:31,576 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 06:05:31,581 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,582 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,582 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,584 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,585 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,586 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... [2020-12-09 06:05:31,587 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 06:05:31,588 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 06:05:31,588 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 06:05:31,588 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 06:05:31,589 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:05:31,647 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 06:05:31,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 06:05:31,647 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 06:05:31,647 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-09 06:05:31,647 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-09 06:05:31,647 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 06:05:31,776 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 06:05:31,776 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-09 06:05:31,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:05:31 BoogieIcfgContainer [2020-12-09 06:05:31,778 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 06:05:31,780 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 06:05:31,780 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 06:05:31,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 06:05:31,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 06:05:31" (1/3) ... [2020-12-09 06:05:31,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@663278ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:05:31, skipping insertion in model container [2020-12-09 06:05:31,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:05:31" (2/3) ... [2020-12-09 06:05:31,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@663278ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:05:31, skipping insertion in model container [2020-12-09 06:05:31,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:05:31" (3/3) ... [2020-12-09 06:05:31,786 INFO L111 eAbstractionObserver]: Analyzing ICFG id_o20.c [2020-12-09 06:05:31,797 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 06:05:31,799 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 06:05:31,808 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 06:05:31,824 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 06:05:31,825 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 06:05:31,825 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 06:05:31,825 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 06:05:31,825 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 06:05:31,825 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 06:05:31,825 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 06:05:31,825 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 06:05:31,835 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-12-09 06:05:31,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 06:05:31,838 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:05:31,838 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:05:31,839 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:05:31,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:05:31,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2020-12-09 06:05:31,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:05:31,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574644396] [2020-12-09 06:05:31,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:05:31,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:05:32,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574644396] [2020-12-09 06:05:32,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:05:32,022 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 06:05:32,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480167207] [2020-12-09 06:05:32,025 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 06:05:32,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:05:32,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 06:05:32,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 06:05:32,037 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 5 states. [2020-12-09 06:05:32,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:05:32,069 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-09 06:05:32,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 06:05:32,071 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-12-09 06:05:32,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:05:32,076 INFO L225 Difference]: With dead ends: 24 [2020-12-09 06:05:32,076 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 06:05:32,078 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 06:05:32,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 06:05:32,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 06:05:32,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 06:05:32,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-09 06:05:32,105 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2020-12-09 06:05:32,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:05:32,105 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-09 06:05:32,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 06:05:32,105 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-09 06:05:32,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-09 06:05:32,106 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:05:32,106 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:05:32,107 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 06:05:32,107 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:05:32,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:05:32,108 INFO L82 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2020-12-09 06:05:32,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:05:32,108 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355914517] [2020-12-09 06:05:32,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:05:32,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:32,206 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 06:05:32,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355914517] [2020-12-09 06:05:32,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317191738] [2020-12-09 06:05:32,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:32,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:32,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 06:05:32,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:05:32,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 06:05:32,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:05:32,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 06:05:32,436 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715670744] [2020-12-09 06:05:32,458 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 06:05:32,458 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:05:32,463 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 06:05:32,464 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:05:32,465 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2020-12-09 06:05:32,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888625895] [2020-12-09 06:05:32,466 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-09 06:05:32,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:05:32,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-09 06:05:32,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-12-09 06:05:32,468 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 13 states. [2020-12-09 06:05:32,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:05:32,503 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-12-09 06:05:32,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 06:05:32,504 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 15 [2020-12-09 06:05:32,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:05:32,504 INFO L225 Difference]: With dead ends: 26 [2020-12-09 06:05:32,504 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 06:05:32,505 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-12-09 06:05:32,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 06:05:32,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-09 06:05:32,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 06:05:32,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-12-09 06:05:32,509 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2020-12-09 06:05:32,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:05:32,509 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-12-09 06:05:32,510 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-09 06:05:32,510 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-12-09 06:05:32,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-09 06:05:32,510 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:05:32,511 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:05:32,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 06:05:32,712 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:05:32,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:05:32,713 INFO L82 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 2 times [2020-12-09 06:05:32,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:05:32,714 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308167435] [2020-12-09 06:05:32,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:05:32,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:32,966 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 06:05:32,966 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308167435] [2020-12-09 06:05:32,966 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045660366] [2020-12-09 06:05:32,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:33,005 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-09 06:05:33,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:05:33,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-09 06:05:33,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:05:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 06:05:33,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:05:33,331 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 06:05:33,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1168926812] [2020-12-09 06:05:33,334 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 06:05:33,334 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:05:33,335 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 06:05:33,335 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:05:33,335 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2020-12-09 06:05:33,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064640630] [2020-12-09 06:05:33,336 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-09 06:05:33,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:05:33,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-09 06:05:33,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2020-12-09 06:05:33,337 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 21 states. [2020-12-09 06:05:33,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:05:33,503 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-12-09 06:05:33,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-09 06:05:33,503 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 27 [2020-12-09 06:05:33,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:05:33,504 INFO L225 Difference]: With dead ends: 38 [2020-12-09 06:05:33,504 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 06:05:33,505 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2020-12-09 06:05:33,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 06:05:33,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-09 06:05:33,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-09 06:05:33,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-12-09 06:05:33,509 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2020-12-09 06:05:33,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:05:33,510 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-12-09 06:05:33,510 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-09 06:05:33,510 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-12-09 06:05:33,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-09 06:05:33,511 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:05:33,511 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:05:33,712 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:33,713 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:05:33,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:05:33,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 3 times [2020-12-09 06:05:33,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:05:33,715 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877112781] [2020-12-09 06:05:33,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:05:33,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:34,011 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-12-09 06:05:34,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877112781] [2020-12-09 06:05:34,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675747932] [2020-12-09 06:05:34,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:34,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 06:05:34,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:05:34,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-09 06:05:34,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:05:34,121 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-12-09 06:05:34,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:05:34,984 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-12-09 06:05:34,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269486769] [2020-12-09 06:05:34,989 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 06:05:34,989 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:05:34,989 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 06:05:34,990 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:05:34,990 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2020-12-09 06:05:34,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990003883] [2020-12-09 06:05:34,990 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-09 06:05:34,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:05:34,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-09 06:05:34,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2020-12-09 06:05:34,992 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 37 states. [2020-12-09 06:05:35,363 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-12-09 06:05:35,629 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-12-09 06:05:36,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:05:36,607 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-12-09 06:05:36,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-09 06:05:36,607 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 51 [2020-12-09 06:05:36,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:05:36,608 INFO L225 Difference]: With dead ends: 62 [2020-12-09 06:05:36,608 INFO L226 Difference]: Without dead ends: 56 [2020-12-09 06:05:36,609 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=386, Invalid=1966, Unknown=0, NotChecked=0, Total=2352 [2020-12-09 06:05:36,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-09 06:05:36,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-09 06:05:36,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-09 06:05:36,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2020-12-09 06:05:36,616 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 51 [2020-12-09 06:05:36,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:05:36,616 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2020-12-09 06:05:36,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-09 06:05:36,616 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2020-12-09 06:05:36,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-12-09 06:05:36,619 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:05:36,619 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:05:36,820 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:36,821 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:05:36,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:05:36,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1758730226, now seen corresponding path program 4 times [2020-12-09 06:05:36,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:05:36,823 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044978436] [2020-12-09 06:05:36,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:05:36,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:37,468 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-12-09 06:05:37,468 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044978436] [2020-12-09 06:05:37,468 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156677941] [2020-12-09 06:05:37,468 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:05:37,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:05:37,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 68 conjunts are in the unsatisfiable core [2020-12-09 06:05:37,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:05:37,621 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-12-09 06:05:37,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:05:40,353 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-12-09 06:05:40,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1084168025] [2020-12-09 06:05:40,355 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 06:05:40,355 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:05:40,355 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 06:05:40,356 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:05:40,356 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2020-12-09 06:05:40,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183623915] [2020-12-09 06:05:40,356 INFO L461 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-12-09 06:05:40,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:05:40,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-12-09 06:05:40,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=4093, Unknown=0, NotChecked=0, Total=4692 [2020-12-09 06:05:40,358 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 69 states. [2020-12-09 06:05:48,672 WARN L197 SmtUtils]: Spent 4.84 s on a formula simplification that was a NOOP. DAG size: 74 [2020-12-09 06:05:57,795 WARN L197 SmtUtils]: Spent 4.26 s on a formula simplification that was a NOOP. DAG size: 72 [2020-12-09 06:06:05,745 WARN L197 SmtUtils]: Spent 3.90 s on a formula simplification that was a NOOP. DAG size: 69 [2020-12-09 06:06:11,551 WARN L197 SmtUtils]: Spent 3.11 s on a formula simplification that was a NOOP. DAG size: 67 [2020-12-09 06:06:16,543 WARN L197 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 64 [2020-12-09 06:06:21,048 WARN L197 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 62 [2020-12-09 06:06:23,760 WARN L197 SmtUtils]: Spent 1.41 s on a formula simplification that was a NOOP. DAG size: 59 [2020-12-09 06:06:26,598 WARN L197 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 57 [2020-12-09 06:06:28,351 WARN L197 SmtUtils]: Spent 606.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-12-09 06:06:30,171 WARN L197 SmtUtils]: Spent 444.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-12-09 06:06:31,951 WARN L197 SmtUtils]: Spent 762.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-12-09 06:06:33,888 WARN L197 SmtUtils]: Spent 833.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-12-09 06:06:35,144 WARN L197 SmtUtils]: Spent 629.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-12-09 06:06:36,279 WARN L197 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-12-09 06:06:37,152 WARN L197 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-12-09 06:06:38,198 WARN L197 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-12-09 06:06:38,740 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-12-09 06:06:39,271 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-12-09 06:06:39,661 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-12-09 06:06:41,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:06:41,392 INFO L93 Difference]: Finished difference Result 110 states and 126 transitions. [2020-12-09 06:06:41,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-12-09 06:06:41,393 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 99 [2020-12-09 06:06:41,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:06:41,395 INFO L225 Difference]: With dead ends: 110 [2020-12-09 06:06:41,395 INFO L226 Difference]: Without dead ends: 104 [2020-12-09 06:06:41,398 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 59.4s TimeCoverageRelationStatistics Valid=1291, Invalid=8021, Unknown=0, NotChecked=0, Total=9312 [2020-12-09 06:06:41,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-09 06:06:41,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2020-12-09 06:06:41,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-12-09 06:06:41,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2020-12-09 06:06:41,408 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 99 [2020-12-09 06:06:41,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:06:41,408 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2020-12-09 06:06:41,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-12-09 06:06:41,408 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2020-12-09 06:06:41,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-12-09 06:06:41,410 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:06:41,410 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:06:41,610 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:06:41,611 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:06:41,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:06:41,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1510268740, now seen corresponding path program 5 times [2020-12-09 06:06:41,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:06:41,613 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777747316] [2020-12-09 06:06:41,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:06:41,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:06:41,710 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:06:41,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:06:41,774 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:06:41,798 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 06:06:41,798 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 06:06:41,798 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-12-09 06:06:41,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 06:06:41 BoogieIcfgContainer [2020-12-09 06:06:41,852 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 06:06:41,852 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 06:06:41,852 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 06:06:41,852 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 06:06:41,853 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:05:31" (3/4) ... [2020-12-09 06:06:41,854 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 06:06:41,897 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_62091e41-532d-4200-9d8a-199b68ae9074/bin/utaipan/witness.graphml [2020-12-09 06:06:41,897 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 06:06:41,898 INFO L168 Benchmark]: Toolchain (without parser) took 70514.13 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 76.4 MB in the beginning and 45.9 MB in the end (delta: 30.5 MB). Peak memory consumption was 57.2 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,898 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 113.2 MB. Free memory is still 92.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:06:41,898 INFO L168 Benchmark]: CACSL2BoogieTranslator took 166.90 ms. Allocated memory is still 113.2 MB. Free memory was 76.2 MB in the beginning and 89.8 MB in the end (delta: -13.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,899 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.55 ms. Allocated memory is still 113.2 MB. Free memory was 89.8 MB in the beginning and 88.8 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:06:41,899 INFO L168 Benchmark]: Boogie Preprocessor took 11.61 ms. Allocated memory is still 113.2 MB. Free memory was 88.8 MB in the beginning and 87.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,899 INFO L168 Benchmark]: RCFGBuilder took 190.52 ms. Allocated memory is still 113.2 MB. Free memory was 87.7 MB in the beginning and 75.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,900 INFO L168 Benchmark]: TraceAbstraction took 70072.04 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 74.6 MB in the beginning and 51.1 MB in the end (delta: 23.5 MB). Peak memory consumption was 53.3 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,900 INFO L168 Benchmark]: Witness Printer took 45.18 ms. Allocated memory is still 140.5 MB. Free memory was 51.1 MB in the beginning and 45.9 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 06:06:41,902 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 113.2 MB. Free memory is still 92.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 166.90 ms. Allocated memory is still 113.2 MB. Free memory was 76.2 MB in the beginning and 89.8 MB in the end (delta: -13.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 22.55 ms. Allocated memory is still 113.2 MB. Free memory was 89.8 MB in the beginning and 88.8 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 11.61 ms. Allocated memory is still 113.2 MB. Free memory was 88.8 MB in the beginning and 87.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 190.52 ms. Allocated memory is still 113.2 MB. Free memory was 87.7 MB in the beginning and 75.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 70072.04 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 74.6 MB in the beginning and 51.1 MB in the end (delta: 23.5 MB). Peak memory consumption was 53.3 MB. Max. memory is 16.1 GB. * Witness Printer took 45.18 ms. Allocated memory is still 140.5 MB. Free memory was 51.1 MB in the beginning and 45.9 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] unsigned int input = __VERIFIER_nondet_uint(); [L13] CALL, EXPR id(input) VAL [\old(x)=20] [L7] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L8] CALL, EXPR id(x-1) VAL [\old(x)=19] [L7] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L8] CALL, EXPR id(x-1) VAL [\old(x)=18] [L7] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L8] CALL, EXPR id(x-1) VAL [\old(x)=17] [L7] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L8] CALL, EXPR id(x-1) VAL [\old(x)=16] [L7] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L8] CALL, EXPR id(x-1) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] unsigned int result = id(input); [L14] COND TRUE result == 20 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 69.9s, OverallIterations: 6, TraceHistogramMax: 21, AutomataDifference: 62.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 115 SDtfs, 2 SDslu, 1928 SDs, 0 SdLazy, 997 SolverSat, 51 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 497 GetRequests, 314 SyntacticMatches, 4 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1193 ImplicationChecksByTransitivity, 62.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=104occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 5.4s InterpolantComputationTime, 522 NumberOfCodeBlocks, 522 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 572 ConstructedInterpolants, 0 QuantifiedInterpolants, 157064 SizeOfPredicates, 4 NumberOfNonLiveVariables, 508 ConjunctsInSsa, 136 ConjunctsInUnsatCore, 13 InterpolantComputations, 1 PerfectInterpolantSequences, 1317/2634 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 RESULT: Ultimate proved your program to be incorrect! Received shutdown request...