./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/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 990c50250359c7452ab1ceec7da37e6f04bc6511 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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-a4ecdab [2020-11-28 07:37:15,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:37:15,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:37:15,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:37:15,591 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:37:15,595 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:37:15,599 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:37:15,606 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:37:15,608 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:37:15,614 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:37:15,615 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:37:15,617 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:37:15,618 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:37:15,621 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:37:15,623 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:37:15,625 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:37:15,627 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:37:15,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:37:15,634 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:37:15,644 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:37:15,646 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:37:15,647 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:37:15,648 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:37:15,649 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:37:15,652 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:37:15,653 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:37:15,653 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:37:15,654 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:37:15,654 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:37:15,655 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:37:15,656 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:37:15,656 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:37:15,657 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:37:15,658 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:37:15,659 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:37:15,659 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:37:15,660 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:37:15,660 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:37:15,660 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:37:15,661 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:37:15,661 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:37:15,662 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:37:15,687 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:37:15,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:37:15,688 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:37:15,688 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:37:15,688 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:37:15,689 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:37:15,689 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:37:15,689 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:37:15,689 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:37:15,689 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:37:15,690 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:37:15,690 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:37:15,690 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:37:15,690 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:37:15,690 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:37:15,691 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:37:15,691 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:37:15,692 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:37:15,693 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:37:15,693 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:37:15,693 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:37:15,693 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:37:15,693 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:37:15,694 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:37:15,694 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:37:15,694 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:37:15,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:37:15,695 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:37:15,695 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:37:15,695 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:37:15,695 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:37:15,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:37:15,696 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:37:15,696 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:37:15,696 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:37:15,696 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_43742537-bc28-4cff-a450-39ca2dfe90d4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 990c50250359c7452ab1ceec7da37e6f04bc6511 [2020-11-28 07:37:15,919 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:37:15,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:37:15,957 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:37:15,958 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:37:15,959 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:37:15,960 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-11-28 07:37:16,036 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/data/9c11aa0fb/76fadbd84b55427788faa48425c4640e/FLAGf3f7e3824 [2020-11-28 07:37:16,544 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:37:16,545 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-11-28 07:37:16,560 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/data/9c11aa0fb/76fadbd84b55427788faa48425c4640e/FLAGf3f7e3824 [2020-11-28 07:37:16,926 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/data/9c11aa0fb/76fadbd84b55427788faa48425c4640e [2020-11-28 07:37:16,929 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:37:16,933 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:37:16,939 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:37:16,939 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:37:16,942 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:37:16,943 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:37:16" (1/1) ... [2020-11-28 07:37:16,946 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b7cc3b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:16, skipping insertion in model container [2020-11-28 07:37:16,947 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:37:16" (1/1) ... [2020-11-28 07:37:16,954 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:37:16,969 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:37:17,096 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:37:17,110 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:37:17,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:37:17,148 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:37:17,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17 WrapperNode [2020-11-28 07:37:17,149 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:37:17,150 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:37:17,150 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:37:17,150 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:37:17,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,162 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,183 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:37:17,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:37:17,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:37:17,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:37:17,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,193 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,194 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,201 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,205 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,208 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... [2020-11-28 07:37:17,210 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:37:17,211 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:37:17,211 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:37:17,211 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:37:17,213 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/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 [2020-11-28 07:37:17,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:37:17,282 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:37:17,282 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-11-28 07:37:17,282 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-11-28 07:37:17,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:37:17,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:37:17,283 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-28 07:37:17,283 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-28 07:37:17,571 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:37:17,571 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-28 07:37:17,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:37:17 BoogieIcfgContainer [2020-11-28 07:37:17,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:37:17,575 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:37:17,575 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:37:17,592 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:37:17,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:37:16" (1/3) ... [2020-11-28 07:37:17,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bebcbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:37:17, skipping insertion in model container [2020-11-28 07:37:17,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:37:17" (2/3) ... [2020-11-28 07:37:17,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bebcbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:37:17, skipping insertion in model container [2020-11-28 07:37:17,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:37:17" (3/3) ... [2020-11-28 07:37:17,595 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-11-28 07:37:17,627 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:37:17,631 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:37:17,643 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:37:17,664 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:37:17,664 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:37:17,664 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:37:17,664 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:37:17,664 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:37:17,664 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:37:17,665 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:37:17,665 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:37:17,677 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-11-28 07:37:17,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 07:37:17,682 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:17,683 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:17,683 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:17,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:17,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1298509706, now seen corresponding path program 1 times [2020-11-28 07:37:17,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:17,697 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896241285] [2020-11-28 07:37:17,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:17,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:17,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:37:17,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896241285] [2020-11-28 07:37:17,881 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:37:17,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 07:37:17,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90629517] [2020-11-28 07:37:17,886 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 07:37:17,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:37:17,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 07:37:17,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:37:17,906 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-11-28 07:37:17,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:37:17,960 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-11-28 07:37:17,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 07:37:17,962 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-28 07:37:17,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:37:17,970 INFO L225 Difference]: With dead ends: 30 [2020-11-28 07:37:17,970 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:37:17,973 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 [2020-11-28 07:37:18,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:37:18,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-11-28 07:37:18,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-28 07:37:18,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-11-28 07:37:18,028 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 9 [2020-11-28 07:37:18,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:37:18,028 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-11-28 07:37:18,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 07:37:18,029 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-11-28 07:37:18,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-28 07:37:18,030 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:18,030 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:18,030 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:37:18,030 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:18,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:18,031 INFO L82 PathProgramCache]: Analyzing trace with hash -995946638, now seen corresponding path program 1 times [2020-11-28 07:37:18,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:18,031 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850508138] [2020-11-28 07:37:18,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:18,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:18,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:37:18,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850508138] [2020-11-28 07:37:18,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:37:18,142 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-11-28 07:37:18,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536156505] [2020-11-28 07:37:18,143 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:37:18,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:37:18,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:37:18,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-11-28 07:37:18,145 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 7 states. [2020-11-28 07:37:18,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:37:18,255 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-11-28 07:37:18,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:37:18,258 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-11-28 07:37:18,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:37:18,259 INFO L225 Difference]: With dead ends: 29 [2020-11-28 07:37:18,260 INFO L226 Difference]: Without dead ends: 25 [2020-11-28 07:37:18,261 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-11-28 07:37:18,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-28 07:37:18,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-11-28 07:37:18,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-28 07:37:18,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-11-28 07:37:18,267 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2020-11-28 07:37:18,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:37:18,267 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-11-28 07:37:18,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:37:18,267 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-11-28 07:37:18,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-28 07:37:18,268 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:18,269 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:18,269 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:37:18,269 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:18,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:18,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1510675502, now seen corresponding path program 1 times [2020-11-28 07:37:18,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:18,270 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741562194] [2020-11-28 07:37:18,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:18,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:18,404 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 07:37:18,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741562194] [2020-11-28 07:37:18,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115831541] [2020-11-28 07:37:18,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/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 [2020-11-28 07:37:18,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:18,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 07:37:18,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:37:18,561 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 07:37:18,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:37:18,866 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:37:18,872 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:37:18,928 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:37:18,940 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:37:18,977 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:37:18,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406413609] [2020-11-28 07:37:19,008 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2020-11-28 07:37:19,009 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:37:19,014 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-28 07:37:19,016 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:37:19,016 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 12 [2020-11-28 07:37:19,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137574367] [2020-11-28 07:37:19,017 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-28 07:37:19,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:37:19,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-28 07:37:19,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-11-28 07:37:19,019 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 12 states. [2020-11-28 07:37:19,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:37:19,171 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-11-28 07:37:19,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:37:19,175 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2020-11-28 07:37:19,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:37:19,176 INFO L225 Difference]: With dead ends: 35 [2020-11-28 07:37:19,176 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 07:37:19,177 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-11-28 07:37:19,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 07:37:19,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-28 07:37:19,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-28 07:37:19,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-11-28 07:37:19,183 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-11-28 07:37:19,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:37:19,183 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-11-28 07:37:19,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-28 07:37:19,183 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-11-28 07:37:19,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-11-28 07:37:19,187 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:19,187 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:19,403 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-28 07:37:19,404 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:19,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:19,404 INFO L82 PathProgramCache]: Analyzing trace with hash -1297859910, now seen corresponding path program 1 times [2020-11-28 07:37:19,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:19,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682833763] [2020-11-28 07:37:19,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:19,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:19,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-28 07:37:19,529 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682833763] [2020-11-28 07:37:19,529 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629219616] [2020-11-28 07:37:19,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/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 [2020-11-28 07:37:19,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:19,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 07:37:19,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:37:19,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-28 07:37:19,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:37:20,373 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 07:37:20,373 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914554938] [2020-11-28 07:37:20,376 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2020-11-28 07:37:20,376 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:37:20,376 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-28 07:37:20,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:37:20,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 14 [2020-11-28 07:37:20,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001851167] [2020-11-28 07:37:20,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-28 07:37:20,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:37:20,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-28 07:37:20,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-11-28 07:37:20,385 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 14 states. [2020-11-28 07:37:20,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:37:20,536 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2020-11-28 07:37:20,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:37:20,538 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2020-11-28 07:37:20,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:37:20,539 INFO L225 Difference]: With dead ends: 41 [2020-11-28 07:37:20,540 INFO L226 Difference]: Without dead ends: 37 [2020-11-28 07:37:20,540 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-11-28 07:37:20,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-28 07:37:20,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2020-11-28 07:37:20,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-28 07:37:20,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-11-28 07:37:20,547 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2020-11-28 07:37:20,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:37:20,547 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-11-28 07:37:20,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-28 07:37:20,547 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-11-28 07:37:20,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-28 07:37:20,553 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:20,553 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:20,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:37:20,780 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:20,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:20,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1632302054, now seen corresponding path program 2 times [2020-11-28 07:37:20,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:20,781 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045908912] [2020-11-28 07:37:20,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:20,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:37:20,900 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:37:20,901 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045908912] [2020-11-28 07:37:20,901 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823987222] [2020-11-28 07:37:20,901 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/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 [2020-11-28 07:37:20,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 07:37:20,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:37:20,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-28 07:37:20,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:37:21,224 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:37:21,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:37:21,875 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:37:21,877 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183227651] [2020-11-28 07:37:21,880 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2020-11-28 07:37:21,882 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:37:21,882 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-28 07:37:21,883 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:37:21,883 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 21 [2020-11-28 07:37:21,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755044456] [2020-11-28 07:37:21,887 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-28 07:37:21,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:37:21,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-28 07:37:21,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=371, Unknown=0, NotChecked=0, Total=420 [2020-11-28 07:37:21,889 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 21 states. [2020-11-28 07:37:22,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:37:22,262 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-11-28 07:37:22,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-28 07:37:22,264 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 33 [2020-11-28 07:37:22,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:37:22,265 INFO L225 Difference]: With dead ends: 47 [2020-11-28 07:37:22,265 INFO L226 Difference]: Without dead ends: 43 [2020-11-28 07:37:22,266 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2020-11-28 07:37:22,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-28 07:37:22,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2020-11-28 07:37:22,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-28 07:37:22,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-11-28 07:37:22,273 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 33 [2020-11-28 07:37:22,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:37:22,273 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-11-28 07:37:22,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-28 07:37:22,274 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-11-28 07:37:22,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-28 07:37:22,275 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:37:22,275 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:37:22,492 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:37:22,492 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:37:22,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:37:22,493 INFO L82 PathProgramCache]: Analyzing trace with hash 890472962, now seen corresponding path program 2 times [2020-11-28 07:37:22,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:37:22,493 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214254702] [2020-11-28 07:37:22,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:37:22,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:37:22,522 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:37:22,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:37:22,543 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:37:22,567 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:37:22,567 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:37:22,567 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-28 07:37:22,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:37:22 BoogieIcfgContainer [2020-11-28 07:37:22,608 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:37:22,609 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:37:22,609 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:37:22,609 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:37:22,610 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:37:17" (3/4) ... [2020-11-28 07:37:22,612 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:37:22,675 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_43742537-bc28-4cff-a450-39ca2dfe90d4/bin/utaipan/witness.graphml [2020-11-28 07:37:22,675 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:37:22,681 INFO L168 Benchmark]: Toolchain (without parser) took 5743.53 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 54.2 MB in the beginning and 50.9 MB in the end (delta: 3.4 MB). Peak memory consumption was 42.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:37:22,681 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 83.9 MB. Free memory was 43.1 MB in the beginning and 43.1 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:37:22,682 INFO L168 Benchmark]: CACSL2BoogieTranslator took 210.50 ms. Allocated memory is still 83.9 MB. Free memory was 54.0 MB in the beginning and 62.6 MB in the end (delta: -8.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:37:22,682 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.81 ms. Allocated memory is still 83.9 MB. Free memory was 62.6 MB in the beginning and 61.3 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:37:22,682 INFO L168 Benchmark]: Boogie Preprocessor took 26.20 ms. Allocated memory is still 83.9 MB. Free memory was 61.3 MB in the beginning and 60.5 MB in the end (delta: 834.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:37:22,683 INFO L168 Benchmark]: RCFGBuilder took 362.60 ms. Allocated memory is still 83.9 MB. Free memory was 60.1 MB in the beginning and 47.6 MB in the end (delta: 12.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-28 07:37:22,683 INFO L168 Benchmark]: TraceAbstraction took 5033.73 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 46.8 MB in the beginning and 55.0 MB in the end (delta: -8.2 MB). Peak memory consumption was 32.5 MB. Max. memory is 16.1 GB. [2020-11-28 07:37:22,684 INFO L168 Benchmark]: Witness Printer took 66.30 ms. Allocated memory is still 121.6 MB. Free memory was 55.0 MB in the beginning and 50.9 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 07:37:22,686 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 83.9 MB. Free memory was 43.1 MB in the beginning and 43.1 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 210.50 ms. Allocated memory is still 83.9 MB. Free memory was 54.0 MB in the beginning and 62.6 MB in the end (delta: -8.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 32.81 ms. Allocated memory is still 83.9 MB. Free memory was 62.6 MB in the beginning and 61.3 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 26.20 ms. Allocated memory is still 83.9 MB. Free memory was 61.3 MB in the beginning and 60.5 MB in the end (delta: 834.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 362.60 ms. Allocated memory is still 83.9 MB. Free memory was 60.1 MB in the beginning and 47.6 MB in the end (delta: 12.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 5033.73 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 46.8 MB in the beginning and 55.0 MB in the end (delta: -8.2 MB). Peak memory consumption was 32.5 MB. Max. memory is 16.1 GB. * Witness Printer took 66.30 ms. Allocated memory is still 121.6 MB. Free memory was 55.0 MB in the beginning and 50.9 MB in the end (delta: 4.2 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: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L20] int input = 5; [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.9s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 70 SDtfs, 77 SDslu, 396 SDs, 0 SdLazy, 330 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 219 GetRequests, 144 SyntacticMatches, 8 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred 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, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.6s InterpolantComputationTime, 225 NumberOfCodeBlocks, 225 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 256 ConstructedInterpolants, 0 QuantifiedInterpolants, 16232 SizeOfPredicates, 10 NumberOfNonLiveVariables, 285 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 11 InterpolantComputations, 2 PerfectInterpolantSequences, 47/102 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...