./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/afterrec_2calls-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_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/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 601aa02d8073825ca8af8297fbd6b010f8103f99 ............................................................................................................................................................................................................................................................................................. 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 [2020-11-22 12:49:57,842 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 12:49:57,845 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 12:49:57,893 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 12:49:57,894 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 12:49:57,895 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 12:49:57,898 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 12:49:57,901 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 12:49:57,903 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 12:49:57,905 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 12:49:57,906 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 12:49:57,908 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 12:49:57,909 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 12:49:57,910 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 12:49:57,912 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 12:49:57,914 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 12:49:57,915 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 12:49:57,917 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 12:49:57,928 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 12:49:57,931 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 12:49:57,934 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 12:49:57,942 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 12:49:57,943 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 12:49:57,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 12:49:57,948 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 12:49:57,949 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 12:49:57,949 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 12:49:57,950 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 12:49:57,951 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 12:49:57,962 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 12:49:57,963 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 12:49:57,966 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 12:49:57,968 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 12:49:57,970 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 12:49:57,972 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 12:49:57,972 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 12:49:57,973 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 12:49:57,973 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 12:49:57,973 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 12:49:57,975 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 12:49:57,976 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 12:49:57,979 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 12:49:58,028 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 12:49:58,034 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 12:49:58,036 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 12:49:58,036 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 12:49:58,036 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 12:49:58,036 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 12:49:58,037 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 12:49:58,037 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 12:49:58,037 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 12:49:58,037 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 12:49:58,039 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 12:49:58,039 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 12:49:58,039 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 12:49:58,040 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 12:49:58,040 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 12:49:58,041 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 12:49:58,041 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 12:49:58,041 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 12:49:58,042 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 12:49:58,042 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 12:49:58,042 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 12:49:58,042 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 12:49:58,042 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 12:49:58,043 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 12:49:58,043 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 12:49:58,043 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 12:49:58,043 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 12:49:58,044 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 12:49:58,044 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 12:49:58,046 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 12:49:58,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 12:49:58,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 12:49:58,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 12:49:58,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 12:49:58,048 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 12:49:58,048 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 12:49:58,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 12:49:58,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 12:49:58,049 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 12:49:58,049 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 12:49:58,049 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_a2357a98-6500-4139-adff-fe3627638f65/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 601aa02d8073825ca8af8297fbd6b010f8103f99 [2020-11-22 12:49:58,337 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 12:49:58,380 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 12:49:58,383 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 12:49:58,384 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 12:49:58,387 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 12:49:58,388 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/../../sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c [2020-11-22 12:49:58,475 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/data/42116fd9d/ebeb5ca5b6e84e80a9770165bb9208e7/FLAGfe0bc19b5 [2020-11-22 12:49:58,999 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 12:49:58,999 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c [2020-11-22 12:49:59,038 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/data/42116fd9d/ebeb5ca5b6e84e80a9770165bb9208e7/FLAGfe0bc19b5 [2020-11-22 12:49:59,363 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/data/42116fd9d/ebeb5ca5b6e84e80a9770165bb9208e7 [2020-11-22 12:49:59,366 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 12:49:59,368 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 12:49:59,369 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 12:49:59,370 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 12:49:59,374 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 12:49:59,375 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,377 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1eb048bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59, skipping insertion in model container [2020-11-22 12:49:59,377 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,391 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 12:49:59,411 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 12:49:59,555 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:49:59,567 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 12:49:59,584 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:49:59,601 INFO L208 MainTranslator]: Completed translation [2020-11-22 12:49:59,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59 WrapperNode [2020-11-22 12:49:59,603 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 12:49:59,604 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 12:49:59,604 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 12:49:59,605 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 12:49:59,614 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,622 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,642 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 12:49:59,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 12:49:59,643 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 12:49:59,643 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 12:49:59,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,663 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... [2020-11-22 12:49:59,665 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 12:49:59,666 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 12:49:59,667 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 12:49:59,667 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 12:49:59,668 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/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 [2020-11-22 12:49:59,736 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-11-22 12:49:59,736 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-11-22 12:49:59,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 12:49:59,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 12:49:59,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 12:49:59,738 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-11-22 12:49:59,738 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-11-22 12:49:59,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 12:50:00,039 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 12:50:00,040 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-22 12:50:00,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:50:00 BoogieIcfgContainer [2020-11-22 12:50:00,042 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 12:50:00,044 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 12:50:00,044 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 12:50:00,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 12:50:00,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:49:59" (1/3) ... [2020-11-22 12:50:00,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f4b7aaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:50:00, skipping insertion in model container [2020-11-22 12:50:00,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:49:59" (2/3) ... [2020-11-22 12:50:00,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f4b7aaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:50:00, skipping insertion in model container [2020-11-22 12:50:00,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:50:00" (3/3) ... [2020-11-22 12:50:00,064 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-11-22 12:50:00,077 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 12:50:00,082 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-11-22 12:50:00,093 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-11-22 12:50:00,115 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 12:50:00,115 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 12:50:00,115 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 12:50:00,115 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 12:50:00,115 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 12:50:00,115 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 12:50:00,115 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 12:50:00,115 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 12:50:00,130 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-11-22 12:50:00,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 12:50:00,135 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:50:00,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:50:00,136 INFO L429 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:50:00,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:50:00,143 INFO L82 PathProgramCache]: Analyzing trace with hash 166311652, now seen corresponding path program 1 times [2020-11-22 12:50:00,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:50:00,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777431263] [2020-11-22 12:50:00,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:50:00,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:50:00,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:50:00,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777431263] [2020-11-22 12:50:00,499 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:50:00,499 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-11-22 12:50:00,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048309769] [2020-11-22 12:50:00,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-22 12:50:00,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:50:00,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-22 12:50:00,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-11-22 12:50:00,531 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 7 states. [2020-11-22 12:50:00,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:50:00,686 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-11-22 12:50:00,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 12:50:00,688 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2020-11-22 12:50:00,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:50:00,698 INFO L225 Difference]: With dead ends: 29 [2020-11-22 12:50:00,698 INFO L226 Difference]: Without dead ends: 19 [2020-11-22 12:50:00,702 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-11-22 12:50:00,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-22 12:50:00,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-11-22 12:50:00,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-22 12:50:00,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-11-22 12:50:00,744 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 10 [2020-11-22 12:50:00,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:50:00,745 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-11-22 12:50:00,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-22 12:50:00,745 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-11-22 12:50:00,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-22 12:50:00,746 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:50:00,746 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:50:00,747 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 12:50:00,747 INFO L429 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:50:00,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:50:00,748 INFO L82 PathProgramCache]: Analyzing trace with hash -800845539, now seen corresponding path program 1 times [2020-11-22 12:50:00,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:50:00,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236316011] [2020-11-22 12:50:00,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:50:00,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:50:00,774 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:50:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:50:00,811 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:50:00,837 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 12:50:00,837 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 12:50:00,839 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 12:50:00,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 12:50:00 BoogieIcfgContainer [2020-11-22 12:50:00,867 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 12:50:00,868 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 12:50:00,868 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 12:50:00,868 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 12:50:00,869 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:50:00" (3/4) ... [2020-11-22 12:50:00,871 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 12:50:00,920 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a2357a98-6500-4139-adff-fe3627638f65/bin/utaipan/witness.graphml [2020-11-22 12:50:00,920 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 12:50:00,923 INFO L168 Benchmark]: Toolchain (without parser) took 1553.97 ms. Allocated memory was 98.6 MB in the beginning and 130.0 MB in the end (delta: 31.5 MB). Free memory was 76.2 MB in the beginning and 84.3 MB in the end (delta: -8.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,923 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 98.6 MB. Free memory is still 75.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:50:00,924 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.84 ms. Allocated memory is still 98.6 MB. Free memory was 76.2 MB in the beginning and 67.2 MB in the end (delta: 9.0 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,925 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.13 ms. Allocated memory is still 98.6 MB. Free memory was 67.2 MB in the beginning and 65.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,926 INFO L168 Benchmark]: Boogie Preprocessor took 22.59 ms. Allocated memory is still 98.6 MB. Free memory was 65.8 MB in the beginning and 64.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,926 INFO L168 Benchmark]: RCFGBuilder took 376.19 ms. Allocated memory is still 98.6 MB. Free memory was 64.7 MB in the beginning and 52.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,927 INFO L168 Benchmark]: TraceAbstraction took 823.10 ms. Allocated memory was 98.6 MB in the beginning and 130.0 MB in the end (delta: 31.5 MB). Free memory was 51.8 MB in the beginning and 86.0 MB in the end (delta: -34.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:50:00,928 INFO L168 Benchmark]: Witness Printer took 52.35 ms. Allocated memory is still 130.0 MB. Free memory was 86.0 MB in the beginning and 84.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:50:00,932 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 98.6 MB. Free memory is still 75.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 233.84 ms. Allocated memory is still 98.6 MB. Free memory was 76.2 MB in the beginning and 67.2 MB in the end (delta: 9.0 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 38.13 ms. Allocated memory is still 98.6 MB. Free memory was 67.2 MB in the beginning and 65.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.59 ms. Allocated memory is still 98.6 MB. Free memory was 65.8 MB in the beginning and 64.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 376.19 ms. Allocated memory is still 98.6 MB. Free memory was 64.7 MB in the beginning and 52.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 823.10 ms. Allocated memory was 98.6 MB in the beginning and 130.0 MB in the end (delta: 31.5 MB). Free memory was 51.8 MB in the beginning and 86.0 MB in the end (delta: -34.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 52.35 ms. Allocated memory is still 130.0 MB. Free memory was 86.0 MB in the beginning and 84.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L23] CALL f(4) [L9] COND FALSE !(n<3) [L10] n-- [L11] CALL f2(n) [L16] COND FALSE !(n<3) [L17] n-- [L18] CALL f(n) [L9] COND TRUE n<3 [L18] RET f(n) [L3] __assert_fail("0", "afterrec_2calls-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 18 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 11 SDtfs, 3 SDslu, 46 SDs, 0 SdLazy, 33 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=1, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 23 NumberOfCodeBlocks, 23 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 9 ConstructedInterpolants, 0 QuantifiedInterpolants, 189 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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...