./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.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_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 07:34:05,659 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:34:05,662 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:34:05,735 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:34:05,735 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:34:05,740 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:34:05,743 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:34:05,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:34:05,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:34:05,755 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:34:05,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:34:05,759 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:34:05,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:34:05,762 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:34:05,764 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:34:05,766 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:34:05,768 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:34:05,771 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:34:05,774 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:34:05,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:34:05,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:34:05,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:34:05,788 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:34:05,789 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:34:05,798 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:34:05,798 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:34:05,799 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:34:05,801 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:34:05,801 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:34:05,803 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:34:05,803 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:34:05,804 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:34:05,807 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:34:05,808 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:34:05,809 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:34:05,810 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:34:05,810 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:34:05,811 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:34:05,811 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:34:05,813 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:34:05,815 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:34:05,817 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:34:05,858 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:34:05,859 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:34:05,860 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:34:05,861 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:34:05,861 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:34:05,861 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:34:05,861 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:34:05,862 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:34:05,862 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:34:05,862 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:34:05,863 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:34:05,864 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:34:05,864 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:34:05,864 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:34:05,864 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:34:05,865 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:34:05,865 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:34:05,866 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:34:05,866 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:34:05,866 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:34:05,866 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:34:05,867 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:34:05,867 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:34:05,867 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:34:05,867 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:34:05,868 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:34:05,868 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:34:05,868 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:34:05,868 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:34:05,870 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:34:05,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:34:05,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:34:05,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:34:05,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:34:05,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:34:05,872 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:34:05,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:34:05,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:34:05,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:34:05,873 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:34:05,873 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_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 [2020-11-28 07:34:06,125 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:34:06,174 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:34:06,179 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:34:06,180 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:34:06,181 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:34:06,181 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2020-11-28 07:34:06,272 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/data/6c1f55159/a94b3e0b49d344deb8fa8e3dcf6d0f91/FLAG41c984fb2 [2020-11-28 07:34:06,674 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:34:06,675 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2020-11-28 07:34:06,680 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/data/6c1f55159/a94b3e0b49d344deb8fa8e3dcf6d0f91/FLAG41c984fb2 [2020-11-28 07:34:07,082 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/data/6c1f55159/a94b3e0b49d344deb8fa8e3dcf6d0f91 [2020-11-28 07:34:07,085 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:34:07,086 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:34:07,090 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:34:07,090 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:34:07,094 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:34:07,096 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63ea0a91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07, skipping insertion in model container [2020-11-28 07:34:07,098 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,106 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:34:07,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:34:07,280 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:34:07,306 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:34:07,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:34:07,333 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:34:07,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07 WrapperNode [2020-11-28 07:34:07,334 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:34:07,335 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:34:07,335 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:34:07,335 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:34:07,343 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,348 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,364 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:34:07,364 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:34:07,365 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:34:07,365 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:34:07,373 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,373 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,375 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,375 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,378 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,380 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,381 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... [2020-11-28 07:34:07,382 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:34:07,383 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:34:07,384 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:34:07,384 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:34:07,385 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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 07:34:07,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:34:07,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:34:07,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:34:07,471 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-28 07:34:07,472 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-28 07:34:07,472 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:34:07,714 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:34:07,715 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-28 07:34:07,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:34:07 BoogieIcfgContainer [2020-11-28 07:34:07,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:34:07,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:34:07,718 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:34:07,734 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:34:07,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:34:07" (1/3) ... [2020-11-28 07:34:07,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@797b6cf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:34:07, skipping insertion in model container [2020-11-28 07:34:07,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:34:07" (2/3) ... [2020-11-28 07:34:07,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@797b6cf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:34:07, skipping insertion in model container [2020-11-28 07:34:07,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:34:07" (3/3) ... [2020-11-28 07:34:07,738 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2020-11-28 07:34:07,748 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:34:07,760 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:34:07,771 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:34:07,802 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:34:07,802 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:34:07,802 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:34:07,802 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:34:07,802 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:34:07,802 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:34:07,802 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:34:07,802 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:34:07,814 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-11-28 07:34:07,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 07:34:07,819 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:07,820 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:07,820 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:07,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:07,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1096838396, now seen corresponding path program 1 times [2020-11-28 07:34:07,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:07,835 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543128604] [2020-11-28 07:34:07,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:07,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:08,038 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 07:34:08,038 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543128604] [2020-11-28 07:34:08,039 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:34:08,039 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 07:34:08,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232840742] [2020-11-28 07:34:08,045 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 07:34:08,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:08,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 07:34:08,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:34:08,066 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 5 states. [2020-11-28 07:34:08,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:08,177 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2020-11-28 07:34:08,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 07:34:08,190 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-28 07:34:08,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:08,212 INFO L225 Difference]: With dead ends: 22 [2020-11-28 07:34:08,213 INFO L226 Difference]: Without dead ends: 14 [2020-11-28 07:34:08,216 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:34:08,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-28 07:34:08,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-28 07:34:08,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-28 07:34:08,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-11-28 07:34:08,250 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2020-11-28 07:34:08,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:08,250 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-11-28 07:34:08,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 07:34:08,250 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-11-28 07:34:08,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-28 07:34:08,252 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:08,252 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:08,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:34:08,253 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:08,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:08,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1249436722, now seen corresponding path program 1 times [2020-11-28 07:34:08,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:08,254 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772449253] [2020-11-28 07:34:08,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:08,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:08,390 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 07:34:08,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772449253] [2020-11-28 07:34:08,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555426597] [2020-11-28 07:34:08,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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 07:34:08,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:08,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:34:08,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:34:08,590 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 07:34:08,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:34:08,811 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:34:08,815 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:34:08,848 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 07:34:08,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032369484] [2020-11-28 07:34:08,874 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-11-28 07:34:08,875 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:34:08,880 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 07:34:08,885 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:34:08,886 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 12 [2020-11-28 07:34:08,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740737099] [2020-11-28 07:34:08,888 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-28 07:34:08,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:08,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-28 07:34:08,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-11-28 07:34:08,894 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 12 states. [2020-11-28 07:34:09,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:09,059 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-11-28 07:34:09,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:34:09,060 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2020-11-28 07:34:09,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:09,062 INFO L225 Difference]: With dead ends: 24 [2020-11-28 07:34:09,062 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:34:09,063 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2020-11-28 07:34:09,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:34:09,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-11-28 07:34:09,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-28 07:34:09,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-11-28 07:34:09,068 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2020-11-28 07:34:09,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:09,069 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-11-28 07:34:09,069 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-28 07:34:09,071 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-11-28 07:34:09,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-11-28 07:34:09,075 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:09,075 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:09,299 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 07:34:09,299 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:09,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:09,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1755191694, now seen corresponding path program 2 times [2020-11-28 07:34:09,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:09,300 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67498877] [2020-11-28 07:34:09,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:09,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:09,459 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:34:09,459 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67498877] [2020-11-28 07:34:09,459 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24829587] [2020-11-28 07:34:09,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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 07:34:09,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-28 07:34:09,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:34:09,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 07:34:09,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:34:09,617 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-11-28 07:34:09,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:34:10,417 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-28 07:34:10,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012326193] [2020-11-28 07:34:10,420 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-11-28 07:34:10,420 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:34:10,420 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 07:34:10,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:34:10,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11] total 16 [2020-11-28 07:34:10,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837963678] [2020-11-28 07:34:10,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-28 07:34:10,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:10,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-28 07:34:10,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2020-11-28 07:34:10,423 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 16 states. [2020-11-28 07:34:10,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:10,669 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-11-28 07:34:10,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:34:10,670 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 27 [2020-11-28 07:34:10,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:10,671 INFO L225 Difference]: With dead ends: 30 [2020-11-28 07:34:10,671 INFO L226 Difference]: Without dead ends: 26 [2020-11-28 07:34:10,672 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2020-11-28 07:34:10,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-28 07:34:10,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-11-28 07:34:10,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-28 07:34:10,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-11-28 07:34:10,678 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 27 [2020-11-28 07:34:10,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:10,679 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-11-28 07:34:10,679 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-28 07:34:10,679 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-11-28 07:34:10,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-28 07:34:10,681 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:10,681 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:10,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:34:10,907 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:10,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:10,907 INFO L82 PathProgramCache]: Analyzing trace with hash 2097719118, now seen corresponding path program 3 times [2020-11-28 07:34:10,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:10,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988645461] [2020-11-28 07:34:10,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:11,078 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2020-11-28 07:34:11,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988645461] [2020-11-28 07:34:11,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551147043] [2020-11-28 07:34:11,079 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/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 07:34:11,151 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:34:11,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:34:11,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 14 conjunts are in the unsatisfiable core [2020-11-28 07:34:11,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:34:11,247 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-11-28 07:34:11,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:34:12,830 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-11-28 07:34:12,830 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457446681] [2020-11-28 07:34:12,833 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-11-28 07:34:12,834 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:34:12,834 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 07:34:12,835 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:34:12,836 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 15] total 20 [2020-11-28 07:34:12,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281710628] [2020-11-28 07:34:12,837 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-28 07:34:12,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:12,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-28 07:34:12,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2020-11-28 07:34:12,839 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 20 states. [2020-11-28 07:34:13,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:13,253 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-11-28 07:34:13,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 07:34:13,254 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 39 [2020-11-28 07:34:13,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:13,256 INFO L225 Difference]: With dead ends: 36 [2020-11-28 07:34:13,256 INFO L226 Difference]: Without dead ends: 32 [2020-11-28 07:34:13,257 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=230, Invalid=526, Unknown=0, NotChecked=0, Total=756 [2020-11-28 07:34:13,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-28 07:34:13,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-11-28 07:34:13,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-28 07:34:13,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-11-28 07:34:13,266 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 39 [2020-11-28 07:34:13,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:13,267 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-11-28 07:34:13,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-28 07:34:13,267 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-11-28 07:34:13,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-11-28 07:34:13,270 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:13,270 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:13,490 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:34:13,491 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:13,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:13,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1804256526, now seen corresponding path program 4 times [2020-11-28 07:34:13,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:13,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134253631] [2020-11-28 07:34:13,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:13,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:13,703 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-11-28 07:34:13,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134253631] [2020-11-28 07:34:13,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013872685] [2020-11-28 07:34:13,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:34:13,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:13,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-28 07:34:13,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:34:13,908 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-11-28 07:34:13,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:34:16,872 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-11-28 07:34:16,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [699537165] [2020-11-28 07:34:16,881 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-11-28 07:34:16,881 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:34:16,881 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 07:34:16,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:34:16,883 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 19] total 24 [2020-11-28 07:34:16,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703001209] [2020-11-28 07:34:16,885 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-11-28 07:34:16,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:16,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-11-28 07:34:16,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2020-11-28 07:34:16,895 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 24 states. [2020-11-28 07:34:17,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:17,423 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-11-28 07:34:17,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-28 07:34:17,425 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 51 [2020-11-28 07:34:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:17,429 INFO L225 Difference]: With dead ends: 42 [2020-11-28 07:34:17,429 INFO L226 Difference]: Without dead ends: 38 [2020-11-28 07:34:17,430 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 87 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=346, Invalid=776, Unknown=0, NotChecked=0, Total=1122 [2020-11-28 07:34:17,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-28 07:34:17,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-11-28 07:34:17,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-28 07:34:17,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-11-28 07:34:17,451 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 51 [2020-11-28 07:34:17,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:17,452 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-11-28 07:34:17,452 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-11-28 07:34:17,452 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-11-28 07:34:17,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-11-28 07:34:17,458 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:17,458 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:17,671 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:34:17,672 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:17,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:17,672 INFO L82 PathProgramCache]: Analyzing trace with hash 32010958, now seen corresponding path program 5 times [2020-11-28 07:34:17,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:17,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879818579] [2020-11-28 07:34:17,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:17,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:34:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 143 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2020-11-28 07:34:17,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879818579] [2020-11-28 07:34:17,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559724507] [2020-11-28 07:34:17,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:34:18,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-11-28 07:34:18,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:34:18,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-28 07:34:18,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:34:18,673 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-11-28 07:34:18,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:34:23,081 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-11-28 07:34:23,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805855869] [2020-11-28 07:34:23,085 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-11-28 07:34:23,085 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:34:23,086 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 07:34:23,087 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:34:23,087 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23, 23] total 48 [2020-11-28 07:34:23,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633394370] [2020-11-28 07:34:23,089 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-11-28 07:34:23,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:34:23,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-11-28 07:34:23,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=1920, Unknown=0, NotChecked=0, Total=2256 [2020-11-28 07:34:23,091 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 48 states. [2020-11-28 07:34:24,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:34:24,603 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2020-11-28 07:34:24,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-11-28 07:34:24,604 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 63 [2020-11-28 07:34:24,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:34:24,606 INFO L225 Difference]: With dead ends: 62 [2020-11-28 07:34:24,607 INFO L226 Difference]: Without dead ends: 56 [2020-11-28 07:34:24,611 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1014, Invalid=5306, Unknown=0, NotChecked=0, Total=6320 [2020-11-28 07:34:24,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-11-28 07:34:24,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-11-28 07:34:24,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-28 07:34:24,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2020-11-28 07:34:24,622 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 63 [2020-11-28 07:34:24,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:34:24,622 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2020-11-28 07:34:24,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-11-28 07:34:24,623 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2020-11-28 07:34:24,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-11-28 07:34:24,626 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:34:24,626 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:34:24,854 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-28 07:34:24,855 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:34:24,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:34:24,855 INFO L82 PathProgramCache]: Analyzing trace with hash -120660978, now seen corresponding path program 6 times [2020-11-28 07:34:24,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:34:24,856 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905294970] [2020-11-28 07:34:24,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:34:24,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:34:24,915 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:34:24,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:34:24,962 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:34:25,001 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:34:25,001 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:34:25,002 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-28 07:34:25,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:34:25 BoogieIcfgContainer [2020-11-28 07:34:25,106 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:34:25,108 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:34:25,108 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:34:25,108 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:34:25,109 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:34:07" (3/4) ... [2020-11-28 07:34:25,111 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:34:25,202 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_637c9369-8ac5-43f2-87e2-d53d88a8c5a9/bin/utaipan/witness.graphml [2020-11-28 07:34:25,203 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:34:25,204 INFO L168 Benchmark]: Toolchain (without parser) took 18117.36 ms. Allocated memory was 88.1 MB in the beginning and 226.5 MB in the end (delta: 138.4 MB). Free memory was 56.4 MB in the beginning and 201.8 MB in the end (delta: -145.4 MB). Peak memory consumption was 124.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,205 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 88.1 MB. Free memory was 62.1 MB in the beginning and 62.1 MB in the end (delta: 27.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:34:25,206 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.96 ms. Allocated memory is still 88.1 MB. Free memory was 56.2 MB in the beginning and 67.3 MB in the end (delta: -11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,206 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.97 ms. Allocated memory is still 88.1 MB. Free memory was 67.3 MB in the beginning and 65.7 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:34:25,207 INFO L168 Benchmark]: Boogie Preprocessor took 18.27 ms. Allocated memory is still 88.1 MB. Free memory was 65.7 MB in the beginning and 64.8 MB in the end (delta: 943.4 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,207 INFO L168 Benchmark]: RCFGBuilder took 333.26 ms. Allocated memory is still 88.1 MB. Free memory was 64.8 MB in the beginning and 52.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,208 INFO L168 Benchmark]: TraceAbstraction took 17387.78 ms. Allocated memory was 88.1 MB in the beginning and 226.5 MB in the end (delta: 138.4 MB). Free memory was 52.2 MB in the beginning and 76.6 MB in the end (delta: -24.4 MB). Peak memory consumption was 114.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,208 INFO L168 Benchmark]: Witness Printer took 95.01 ms. Allocated memory is still 226.5 MB. Free memory was 76.6 MB in the beginning and 201.8 MB in the end (delta: -125.2 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-28 07:34:25,211 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 88.1 MB. Free memory was 62.1 MB in the beginning and 62.1 MB in the end (delta: 27.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 243.96 ms. Allocated memory is still 88.1 MB. Free memory was 56.2 MB in the beginning and 67.3 MB in the end (delta: -11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.97 ms. Allocated memory is still 88.1 MB. Free memory was 67.3 MB in the beginning and 65.7 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.27 ms. Allocated memory is still 88.1 MB. Free memory was 65.7 MB in the beginning and 64.8 MB in the end (delta: 943.4 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 333.26 ms. Allocated memory is still 88.1 MB. Free memory was 64.8 MB in the beginning and 52.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 17387.78 ms. Allocated memory was 88.1 MB in the beginning and 226.5 MB in the end (delta: 138.4 MB). Free memory was 52.2 MB in the beginning and 76.6 MB in the end (delta: -24.4 MB). Peak memory consumption was 114.4 MB. Max. memory is 16.1 GB. * Witness Printer took 95.01 ms. Allocated memory is still 226.5 MB. Free memory was 76.6 MB in the beginning and 201.8 MB in the end (delta: -125.2 MB). Peak memory consumption was 6.3 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: [L12] int input = 15; [L13] CALL, EXPR id(input) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 15 [L4] __assert_fail("0", "id_i15_o15-2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 17.2s, OverallIterations: 7, TraceHistogramMax: 16, AutomataDifference: 3.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 54 SDtfs, 292 SDslu, 326 SDs, 0 SdLazy, 397 SolverSat, 185 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 522 GetRequests, 323 SyntacticMatches, 25 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1549 ImplicationChecksByTransitivity, 4.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=6, 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, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 11.8s InterpolantComputationTime, 498 NumberOfCodeBlocks, 498 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 578 ConstructedInterpolants, 0 QuantifiedInterpolants, 69562 SizeOfPredicates, 25 NumberOfNonLiveVariables, 615 ConjunctsInSsa, 70 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 651/1560 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...