./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 f8ce463a68003145f68f57eef3f97a99b93a908a ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 13:06:47,572 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:06:47,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:06:47,623 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:06:47,624 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:06:47,629 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:06:47,631 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:06:47,635 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:06:47,637 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:06:47,655 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:06:47,656 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:06:47,658 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:06:47,658 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:06:47,659 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:06:47,660 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:06:47,661 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:06:47,662 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:06:47,663 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:06:47,665 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:06:47,667 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:06:47,670 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:06:47,671 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:06:47,672 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:06:47,673 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:06:47,676 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:06:47,677 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:06:47,677 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:06:47,678 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:06:47,679 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:06:47,680 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:06:47,680 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:06:47,681 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:06:47,682 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:06:47,683 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:06:47,684 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:06:47,684 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:06:47,685 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:06:47,685 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:06:47,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:06:47,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:06:47,688 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:06:47,693 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:06:47,717 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:06:47,718 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:06:47,719 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:06:47,719 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:06:47,719 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:06:47,719 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:06:47,719 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:06:47,720 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:06:47,720 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:06:47,720 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:06:47,720 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:06:47,721 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:06:47,721 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:06:47,721 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:06:47,721 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:06:47,722 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:06:47,722 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:06:47,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:06:47,723 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:06:47,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:06:47,723 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:06:47,723 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:06:47,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:06:47,724 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:06:47,724 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:06:47,724 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:06:47,724 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:06:47,725 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:06:47,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:06:47,725 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:06:47,725 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:06:47,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:06:47,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:06:47,726 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:06:47,726 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:06:47,727 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:06:47,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:06:47,727 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:06:47,727 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:06:47,727 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:06:47,728 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_574c3467-979c-45d9-9dec-abb2ea20846b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8ce463a68003145f68f57eef3f97a99b93a908a [2020-11-22 13:06:47,981 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:06:48,011 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:06:48,021 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:06:48,022 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:06:48,023 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:06:48,024 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c [2020-11-22 13:06:48,111 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/data/18aed8570/4a65307dbd164e5daa1f169d8a8bd09b/FLAGbeffc76fa [2020-11-22 13:06:48,549 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:06:48,549 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c [2020-11-22 13:06:48,559 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/data/18aed8570/4a65307dbd164e5daa1f169d8a8bd09b/FLAGbeffc76fa [2020-11-22 13:06:48,925 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/data/18aed8570/4a65307dbd164e5daa1f169d8a8bd09b [2020-11-22 13:06:48,928 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:06:48,929 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:06:48,931 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:06:48,931 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:06:48,934 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:06:48,935 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:06:48" (1/1) ... [2020-11-22 13:06:48,937 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69a74f6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:48, skipping insertion in model container [2020-11-22 13:06:48,938 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:06:48" (1/1) ... [2020-11-22 13:06:48,945 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:06:48,958 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:06:49,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:06:49,134 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:06:49,166 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:06:49,184 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:06:49,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49 WrapperNode [2020-11-22 13:06:49,185 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:06:49,188 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:06:49,189 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:06:49,189 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:06:49,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,205 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,221 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:06:49,223 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:06:49,223 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:06:49,223 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:06:49,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,252 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,259 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... [2020-11-22 13:06:49,260 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:06:49,261 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:06:49,261 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:06:49,261 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:06:49,262 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:06:49,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:06:49,335 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-11-22 13:06:49,335 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-11-22 13:06:49,335 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:06:49,336 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-11-22 13:06:49,336 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-11-22 13:06:49,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:06:49,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:06:49,712 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:06:49,712 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-22 13:06:49,714 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:49 BoogieIcfgContainer [2020-11-22 13:06:49,714 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:06:49,715 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:06:49,715 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:06:49,727 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:06:49,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:06:48" (1/3) ... [2020-11-22 13:06:49,735 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412666ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:06:49, skipping insertion in model container [2020-11-22 13:06:49,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:49" (2/3) ... [2020-11-22 13:06:49,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412666ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:06:49, skipping insertion in model container [2020-11-22 13:06:49,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:49" (3/3) ... [2020-11-22 13:06:49,737 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-11-22 13:06:49,748 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:06:49,753 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:06:49,769 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:06:49,794 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:06:49,794 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:06:49,794 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:06:49,794 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:06:49,795 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:06:49,795 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:06:49,795 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:06:49,795 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:06:49,810 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-11-22 13:06:49,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-22 13:06:49,814 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:49,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:49,816 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:49,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:49,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1315362186, now seen corresponding path program 1 times [2020-11-22 13:06:49,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:49,831 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426303512] [2020-11-22 13:06:49,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:49,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:50,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:06:50,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426303512] [2020-11-22 13:06:50,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:06:50,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:06:50,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266713816] [2020-11-22 13:06:50,008 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:06:50,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:50,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:06:50,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:06:50,030 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-11-22 13:06:50,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:50,167 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-11-22 13:06:50,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:06:50,170 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-22 13:06:50,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:50,183 INFO L225 Difference]: With dead ends: 34 [2020-11-22 13:06:50,183 INFO L226 Difference]: Without dead ends: 26 [2020-11-22 13:06:50,189 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 [2020-11-22 13:06:50,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-22 13:06:50,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-11-22 13:06:50,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-22 13:06:50,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2020-11-22 13:06:50,237 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2020-11-22 13:06:50,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:50,237 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2020-11-22 13:06:50,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:06:50,238 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2020-11-22 13:06:50,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:06:50,240 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:50,240 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:50,240 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:06:50,241 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:50,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:50,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1458225802, now seen corresponding path program 1 times [2020-11-22 13:06:50,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:50,246 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557297932] [2020-11-22 13:06:50,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:50,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:06:50,310 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557297932] [2020-11-22 13:06:50,310 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:06:50,310 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:06:50,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490423922] [2020-11-22 13:06:50,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:06:50,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:50,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:06:50,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:06:50,313 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 5 states. [2020-11-22 13:06:50,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:50,369 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-11-22 13:06:50,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:06:50,370 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-22 13:06:50,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:50,371 INFO L225 Difference]: With dead ends: 32 [2020-11-22 13:06:50,372 INFO L226 Difference]: Without dead ends: 28 [2020-11-22 13:06:50,372 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 [2020-11-22 13:06:50,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-22 13:06:50,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-11-22 13:06:50,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-22 13:06:50,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2020-11-22 13:06:50,380 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2020-11-22 13:06:50,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:50,380 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2020-11-22 13:06:50,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:06:50,380 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2020-11-22 13:06:50,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-22 13:06:50,381 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:50,382 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:50,382 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:06:50,382 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:50,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:50,383 INFO L82 PathProgramCache]: Analyzing trace with hash -2038826467, now seen corresponding path program 1 times [2020-11-22 13:06:50,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:50,383 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103376252] [2020-11-22 13:06:50,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:50,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:50,494 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:50,499 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103376252] [2020-11-22 13:06:50,499 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378439468] [2020-11-22 13:06:50,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 [2020-11-22 13:06:50,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:50,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:06:50,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:50,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:50,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:50,908 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 13:06:50,957 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:50,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999128555] [2020-11-22 13:06:50,979 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2020-11-22 13:06:50,980 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:50,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:06:50,988 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:06:50,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:06:51,267 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.TopInputCallSummarizer.summarize(TopInputCallSummarizer.java:67) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretCallReturnSummary(DagInterpreter.java:220) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:207) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) 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) [2020-11-22 13:06:51,268 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:51,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 12 [2020-11-22 13:06:51,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531001193] [2020-11-22 13:06:51,269 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-22 13:06:51,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:51,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-22 13:06:51,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:06:51,270 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2020-11-22 13:06:51,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:51,523 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2020-11-22 13:06:51,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-22 13:06:51,525 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-11-22 13:06:51,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:51,526 INFO L225 Difference]: With dead ends: 54 [2020-11-22 13:06:51,526 INFO L226 Difference]: Without dead ends: 30 [2020-11-22 13:06:51,527 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:06:51,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-22 13:06:51,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-11-22 13:06:51,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-22 13:06:51,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-11-22 13:06:51,537 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2020-11-22 13:06:51,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:51,537 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-11-22 13:06:51,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-22 13:06:51,537 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-11-22 13:06:51,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-22 13:06:51,539 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:51,539 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:51,756 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-22 13:06:51,757 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:51,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:51,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1495076739, now seen corresponding path program 1 times [2020-11-22 13:06:51,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:51,758 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756612200] [2020-11-22 13:06:51,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:51,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:51,847 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:51,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756612200] [2020-11-22 13:06:51,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469633246] [2020-11-22 13:06:51,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 [2020-11-22 13:06:51,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:51,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:06:51,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:51,922 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:51,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:52,134 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:06:52,135 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1175797524] [2020-11-22 13:06:52,137 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2020-11-22 13:06:52,138 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:52,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:06:52,138 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:06:52,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:06:52,406 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.TopInputCallSummarizer.summarize(TopInputCallSummarizer.java:67) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretCallReturnSummary(DagInterpreter.java:220) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:207) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) 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) [2020-11-22 13:06:52,406 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:52,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2020-11-22 13:06:52,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640984606] [2020-11-22 13:06:52,407 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-22 13:06:52,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:52,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-22 13:06:52,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-11-22 13:06:52,409 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 10 states. [2020-11-22 13:06:52,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:52,530 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2020-11-22 13:06:52,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 13:06:52,530 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2020-11-22 13:06:52,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:52,532 INFO L225 Difference]: With dead ends: 39 [2020-11-22 13:06:52,532 INFO L226 Difference]: Without dead ends: 35 [2020-11-22 13:06:52,533 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:06:52,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-22 13:06:52,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-11-22 13:06:52,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-22 13:06:52,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-11-22 13:06:52,542 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2020-11-22 13:06:52,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:52,543 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-11-22 13:06:52,543 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-22 13:06:52,543 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-11-22 13:06:52,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-11-22 13:06:52,545 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:52,545 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:52,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-22 13:06:52,768 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:52,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:52,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1338050228, now seen corresponding path program 1 times [2020-11-22 13:06:52,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:52,769 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286288213] [2020-11-22 13:06:52,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:52,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:52,822 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-22 13:06:52,822 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286288213] [2020-11-22 13:06:52,822 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891245121] [2020-11-22 13:06:52,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 [2020-11-22 13:06:52,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:52,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:06:52,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:52,985 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-22 13:06:52,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:53,389 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:06:53,390 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514074737] [2020-11-22 13:06:53,395 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:06:53,396 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:53,396 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) [2020-11-22 13:06:53,397 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:53,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2020-11-22 13:06:53,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014538832] [2020-11-22 13:06:53,400 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-22 13:06:53,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:53,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-22 13:06:53,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:06:53,402 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 14 states. [2020-11-22 13:06:53,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:53,621 INFO L93 Difference]: Finished difference Result 66 states and 96 transitions. [2020-11-22 13:06:53,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-22 13:06:53,621 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-11-22 13:06:53,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:53,623 INFO L225 Difference]: With dead ends: 66 [2020-11-22 13:06:53,623 INFO L226 Difference]: Without dead ends: 35 [2020-11-22 13:06:53,624 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2020-11-22 13:06:53,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-22 13:06:53,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-11-22 13:06:53,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-22 13:06:53,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 46 transitions. [2020-11-22 13:06:53,631 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 46 transitions. Word has length 35 [2020-11-22 13:06:53,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:53,631 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 46 transitions. [2020-11-22 13:06:53,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-22 13:06:53,631 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 46 transitions. [2020-11-22 13:06:53,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-22 13:06:53,633 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:53,633 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:53,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:06:53,846 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:53,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:53,846 INFO L82 PathProgramCache]: Analyzing trace with hash 2123237324, now seen corresponding path program 1 times [2020-11-22 13:06:53,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:53,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614176572] [2020-11-22 13:06:53,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:53,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:53,970 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-22 13:06:53,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614176572] [2020-11-22 13:06:53,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057178299] [2020-11-22 13:06:53,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 [2020-11-22 13:06:54,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:54,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:06:54,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:54,154 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-22 13:06:54,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:54,480 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:06:54,480 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520510924] [2020-11-22 13:06:54,483 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:06:54,483 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:54,483 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) [2020-11-22 13:06:54,483 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:54,484 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 17 [2020-11-22 13:06:54,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125525011] [2020-11-22 13:06:54,484 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-22 13:06:54,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:54,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-22 13:06:54,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:06:54,486 INFO L87 Difference]: Start difference. First operand 35 states and 46 transitions. Second operand 17 states. [2020-11-22 13:06:55,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:55,022 INFO L93 Difference]: Finished difference Result 98 states and 158 transitions. [2020-11-22 13:06:55,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-22 13:06:55,023 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2020-11-22 13:06:55,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:55,025 INFO L225 Difference]: With dead ends: 98 [2020-11-22 13:06:55,025 INFO L226 Difference]: Without dead ends: 65 [2020-11-22 13:06:55,027 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2020-11-22 13:06:55,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-11-22 13:06:55,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2020-11-22 13:06:55,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-22 13:06:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 86 transitions. [2020-11-22 13:06:55,056 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 86 transitions. Word has length 36 [2020-11-22 13:06:55,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:55,057 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 86 transitions. [2020-11-22 13:06:55,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-22 13:06:55,057 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 86 transitions. [2020-11-22 13:06:55,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-11-22 13:06:55,062 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:55,062 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:55,276 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:06:55,277 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:55,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1284483151, now seen corresponding path program 1 times [2020-11-22 13:06:55,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:55,277 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036354167] [2020-11-22 13:06:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:55,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:55,386 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:06:55,386 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036354167] [2020-11-22 13:06:55,386 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674300191] [2020-11-22 13:06:55,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/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 [2020-11-22 13:06:55,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:55,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-22 13:06:55,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-22 13:06:55,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:56,196 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-11-22 13:06:56,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27087470] [2020-11-22 13:06:56,199 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:06:56,199 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:56,199 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) [2020-11-22 13:06:56,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:56,200 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2020-11-22 13:06:56,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854240557] [2020-11-22 13:06:56,201 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-22 13:06:56,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:56,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-22 13:06:56,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:06:56,202 INFO L87 Difference]: Start difference. First operand 56 states and 86 transitions. Second operand 17 states. [2020-11-22 13:06:56,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:56,515 INFO L93 Difference]: Finished difference Result 102 states and 193 transitions. [2020-11-22 13:06:56,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-22 13:06:56,516 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2020-11-22 13:06:56,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:56,519 INFO L225 Difference]: With dead ends: 102 [2020-11-22 13:06:56,519 INFO L226 Difference]: Without dead ends: 98 [2020-11-22 13:06:56,520 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 89 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-11-22 13:06:56,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-11-22 13:06:56,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 64. [2020-11-22 13:06:56,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-11-22 13:06:56,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 106 transitions. [2020-11-22 13:06:56,566 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 106 transitions. Word has length 50 [2020-11-22 13:06:56,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:56,567 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 106 transitions. [2020-11-22 13:06:56,567 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-22 13:06:56,567 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 106 transitions. [2020-11-22 13:06:56,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-11-22 13:06:56,572 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:56,572 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:56,796 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-11-22 13:06:56,797 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:56,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:56,797 INFO L82 PathProgramCache]: Analyzing trace with hash -897363601, now seen corresponding path program 1 times [2020-11-22 13:06:56,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:56,797 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100958927] [2020-11-22 13:06:56,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:56,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:57,043 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 44 proven. 81 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2020-11-22 13:06:57,043 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100958927] [2020-11-22 13:06:57,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102860617] [2020-11-22 13:06:57,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:06:57,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:57,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-22 13:06:57,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:57,247 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 17 proven. 119 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2020-11-22 13:06:57,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:58,215 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 17 proven. 129 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2020-11-22 13:06:58,215 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350535190] [2020-11-22 13:06:58,217 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:06:58,218 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:58,218 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) [2020-11-22 13:06:58,218 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:58,218 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 21 [2020-11-22 13:06:58,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598980143] [2020-11-22 13:06:58,220 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-22 13:06:58,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:58,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-22 13:06:58,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-11-22 13:06:58,221 INFO L87 Difference]: Start difference. First operand 64 states and 106 transitions. Second operand 21 states. [2020-11-22 13:06:59,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:59,111 INFO L93 Difference]: Finished difference Result 175 states and 367 transitions. [2020-11-22 13:06:59,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-22 13:06:59,111 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 106 [2020-11-22 13:06:59,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:59,114 INFO L225 Difference]: With dead ends: 175 [2020-11-22 13:06:59,114 INFO L226 Difference]: Without dead ends: 101 [2020-11-22 13:06:59,118 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=250, Invalid=1156, Unknown=0, NotChecked=0, Total=1406 [2020-11-22 13:06:59,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-11-22 13:06:59,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 90. [2020-11-22 13:06:59,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-11-22 13:06:59,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 129 transitions. [2020-11-22 13:06:59,136 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 129 transitions. Word has length 106 [2020-11-22 13:06:59,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:59,136 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 129 transitions. [2020-11-22 13:06:59,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-22 13:06:59,137 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 129 transitions. [2020-11-22 13:06:59,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2020-11-22 13:06:59,142 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:59,143 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 12, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:06:59,344 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:06:59,345 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:59,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:59,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1039388239, now seen corresponding path program 1 times [2020-11-22 13:06:59,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:59,345 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78488190] [2020-11-22 13:06:59,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:59,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:59,545 INFO L134 CoverageAnalysis]: Checked inductivity of 922 backedges. 52 proven. 230 refuted. 0 times theorem prover too weak. 640 trivial. 0 not checked. [2020-11-22 13:06:59,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78488190] [2020-11-22 13:06:59,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837440208] [2020-11-22 13:06:59,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:06:59,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:59,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-22 13:06:59,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:59,732 INFO L134 CoverageAnalysis]: Checked inductivity of 922 backedges. 52 proven. 230 refuted. 0 times theorem prover too weak. 640 trivial. 0 not checked. [2020-11-22 13:06:59,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:00,830 INFO L134 CoverageAnalysis]: Checked inductivity of 922 backedges. 52 proven. 238 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-11-22 13:07:00,830 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681725845] [2020-11-22 13:07:00,834 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:00,834 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:00,835 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) [2020-11-22 13:07:00,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:00,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 15 [2020-11-22 13:07:00,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708133884] [2020-11-22 13:07:00,841 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-22 13:07:00,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:00,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-22 13:07:00,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-11-22 13:07:00,843 INFO L87 Difference]: Start difference. First operand 90 states and 129 transitions. Second operand 15 states. [2020-11-22 13:07:00,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:00,994 INFO L93 Difference]: Finished difference Result 127 states and 204 transitions. [2020-11-22 13:07:00,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-22 13:07:00,996 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 186 [2020-11-22 13:07:00,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:00,999 INFO L225 Difference]: With dead ends: 127 [2020-11-22 13:07:00,999 INFO L226 Difference]: Without dead ends: 123 [2020-11-22 13:07:01,000 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 359 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-11-22 13:07:01,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-11-22 13:07:01,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 102. [2020-11-22 13:07:01,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-11-22 13:07:01,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-11-22 13:07:01,018 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 186 [2020-11-22 13:07:01,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:01,019 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-11-22 13:07:01,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-22 13:07:01,019 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-11-22 13:07:01,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-11-22 13:07:01,022 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:07:01,022 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 10, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:07:01,236 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:01,237 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:07:01,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:07:01,237 INFO L82 PathProgramCache]: Analyzing trace with hash 2111655763, now seen corresponding path program 1 times [2020-11-22 13:07:01,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:07:01,238 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967009270] [2020-11-22 13:07:01,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:07:01,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:01,405 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 149 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2020-11-22 13:07:01,409 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967009270] [2020-11-22 13:07:01,409 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62028975] [2020-11-22 13:07:01,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:01,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:01,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-22 13:07:01,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:07:01,574 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 149 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2020-11-22 13:07:01,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:02,324 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 154 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2020-11-22 13:07:02,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013998829] [2020-11-22 13:07:02,328 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:02,329 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:02,329 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) [2020-11-22 13:07:02,330 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:02,331 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 13 [2020-11-22 13:07:02,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823146326] [2020-11-22 13:07:02,333 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-22 13:07:02,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:02,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-22 13:07:02,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-11-22 13:07:02,334 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 13 states. [2020-11-22 13:07:02,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:02,509 INFO L93 Difference]: Finished difference Result 132 states and 238 transitions. [2020-11-22 13:07:02,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-22 13:07:02,510 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 160 [2020-11-22 13:07:02,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:02,512 INFO L225 Difference]: With dead ends: 132 [2020-11-22 13:07:02,513 INFO L226 Difference]: Without dead ends: 128 [2020-11-22 13:07:02,513 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 312 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:07:02,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-11-22 13:07:02,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 102. [2020-11-22 13:07:02,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-11-22 13:07:02,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-11-22 13:07:02,542 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 160 [2020-11-22 13:07:02,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:02,542 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-11-22 13:07:02,542 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-22 13:07:02,542 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-11-22 13:07:02,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-11-22 13:07:02,545 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:07:02,545 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:07:02,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2020-11-22 13:07:02,746 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:07:02,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:07:02,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1655082986, now seen corresponding path program 2 times [2020-11-22 13:07:02,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:07:02,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826716554] [2020-11-22 13:07:02,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:07:02,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:02,877 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 135 proven. 32 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2020-11-22 13:07:02,877 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826716554] [2020-11-22 13:07:02,877 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048444319] [2020-11-22 13:07:02,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:02,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-22 13:07:02,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:07:02,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:07:02,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:07:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 135 proven. 32 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2020-11-22 13:07:03,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:03,637 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 135 proven. 34 refuted. 0 times theorem prover too weak. 618 trivial. 0 not checked. [2020-11-22 13:07:03,638 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923383885] [2020-11-22 13:07:03,642 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:03,642 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:03,642 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) [2020-11-22 13:07:03,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:03,644 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 11 [2020-11-22 13:07:03,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331024731] [2020-11-22 13:07:03,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-22 13:07:03,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:03,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-22 13:07:03,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:07:03,647 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 11 states. [2020-11-22 13:07:03,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:03,761 INFO L93 Difference]: Finished difference Result 119 states and 189 transitions. [2020-11-22 13:07:03,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:07:03,762 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 173 [2020-11-22 13:07:03,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:03,764 INFO L225 Difference]: With dead ends: 119 [2020-11-22 13:07:03,764 INFO L226 Difference]: Without dead ends: 115 [2020-11-22 13:07:03,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 337 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:07:03,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-11-22 13:07:03,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 107. [2020-11-22 13:07:03,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-11-22 13:07:03,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 168 transitions. [2020-11-22 13:07:03,786 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 168 transitions. Word has length 173 [2020-11-22 13:07:03,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:03,788 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 168 transitions. [2020-11-22 13:07:03,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-22 13:07:03,788 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 168 transitions. [2020-11-22 13:07:03,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-11-22 13:07:03,793 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:07:03,793 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:07:04,016 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-11-22 13:07:04,016 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:07:04,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:07:04,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1634999420, now seen corresponding path program 3 times [2020-11-22 13:07:04,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:07:04,017 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427709587] [2020-11-22 13:07:04,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:07:04,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:04,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 237 proven. 101 refuted. 0 times theorem prover too weak. 735 trivial. 0 not checked. [2020-11-22 13:07:04,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427709587] [2020-11-22 13:07:04,255 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262257927] [2020-11-22 13:07:04,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:04,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-22 13:07:04,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:07:04,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-22 13:07:04,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:07:04,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 208 proven. 368 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2020-11-22 13:07:04,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:07,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 208 proven. 386 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-11-22 13:07:07,107 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1280430913] [2020-11-22 13:07:07,120 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:07,120 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:07,122 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) [2020-11-22 13:07:07,123 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:07,123 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 23] total 31 [2020-11-22 13:07:07,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799665621] [2020-11-22 13:07:07,124 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-11-22 13:07:07,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:07,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-11-22 13:07:07,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=825, Unknown=0, NotChecked=0, Total=930 [2020-11-22 13:07:07,126 INFO L87 Difference]: Start difference. First operand 107 states and 168 transitions. Second operand 31 states. [2020-11-22 13:07:08,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:08,394 INFO L93 Difference]: Finished difference Result 265 states and 537 transitions. [2020-11-22 13:07:08,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-11-22 13:07:08,395 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 200 [2020-11-22 13:07:08,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:08,398 INFO L225 Difference]: With dead ends: 265 [2020-11-22 13:07:08,398 INFO L226 Difference]: Without dead ends: 151 [2020-11-22 13:07:08,401 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 368 SyntacticMatches, 15 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-11-22 13:07:08,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-11-22 13:07:08,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 135. [2020-11-22 13:07:08,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2020-11-22 13:07:08,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 193 transitions. [2020-11-22 13:07:08,422 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 193 transitions. Word has length 200 [2020-11-22 13:07:08,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:08,426 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 193 transitions. [2020-11-22 13:07:08,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-11-22 13:07:08,426 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 193 transitions. [2020-11-22 13:07:08,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2020-11-22 13:07:08,430 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:07:08,430 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 14, 13, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 5, 3, 3, 1, 1, 1, 1, 1, 1] [2020-11-22 13:07:08,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2020-11-22 13:07:08,649 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:07:08,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:07:08,649 INFO L82 PathProgramCache]: Analyzing trace with hash 209011082, now seen corresponding path program 4 times [2020-11-22 13:07:08,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:07:08,649 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820158649] [2020-11-22 13:07:08,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:07:08,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:08,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1417 backedges. 122 proven. 277 refuted. 0 times theorem prover too weak. 1018 trivial. 0 not checked. [2020-11-22 13:07:08,844 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820158649] [2020-11-22 13:07:08,844 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039785517] [2020-11-22 13:07:08,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:09,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:09,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-22 13:07:09,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:07:09,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1417 backedges. 113 proven. 389 refuted. 0 times theorem prover too weak. 915 trivial. 0 not checked. [2020-11-22 13:07:09,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:11,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1417 backedges. 113 proven. 410 refuted. 0 times theorem prover too weak. 894 trivial. 0 not checked. [2020-11-22 13:07:11,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [381808453] [2020-11-22 13:07:11,118 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:11,118 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:11,118 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) [2020-11-22 13:07:11,119 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:11,120 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 17] total 22 [2020-11-22 13:07:11,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954433738] [2020-11-22 13:07:11,121 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-22 13:07:11,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:11,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-22 13:07:11,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2020-11-22 13:07:11,122 INFO L87 Difference]: Start difference. First operand 135 states and 193 transitions. Second operand 22 states. [2020-11-22 13:07:11,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:11,457 INFO L93 Difference]: Finished difference Result 145 states and 205 transitions. [2020-11-22 13:07:11,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-22 13:07:11,457 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 228 [2020-11-22 13:07:11,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:11,459 INFO L225 Difference]: With dead ends: 145 [2020-11-22 13:07:11,459 INFO L226 Difference]: Without dead ends: 98 [2020-11-22 13:07:11,460 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 436 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2020-11-22 13:07:11,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-11-22 13:07:11,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-11-22 13:07:11,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-11-22 13:07:11,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 114 transitions. [2020-11-22 13:07:11,467 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 114 transitions. Word has length 228 [2020-11-22 13:07:11,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:11,467 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 114 transitions. [2020-11-22 13:07:11,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-22 13:07:11,467 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 114 transitions. [2020-11-22 13:07:11,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-11-22 13:07:11,473 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:07:11,473 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:07:11,688 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2020-11-22 13:07:11,689 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:07:11,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:07:11,689 INFO L82 PathProgramCache]: Analyzing trace with hash -580482170, now seen corresponding path program 5 times [2020-11-22 13:07:11,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:07:11,689 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052841077] [2020-11-22 13:07:11,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:07:11,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:07:12,306 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-11-22 13:07:12,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052841077] [2020-11-22 13:07:12,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252827819] [2020-11-22 13:07:12,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:07:12,461 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2020-11-22 13:07:12,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:07:12,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 103 conjunts are in the unsatisfiable core [2020-11-22 13:07:12,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:07:12,878 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-11-22 13:07:12,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:07:14,359 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-11-22 13:07:14,360 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155406809] [2020-11-22 13:07:14,361 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:07:14,362 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:07:14,362 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) [2020-11-22 13:07:14,363 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:07:14,363 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 36 [2020-11-22 13:07:14,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751760877] [2020-11-22 13:07:14,364 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-11-22 13:07:14,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:07:14,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-11-22 13:07:14,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-11-22 13:07:14,366 INFO L87 Difference]: Start difference. First operand 98 states and 114 transitions. Second operand 36 states. [2020-11-22 13:07:14,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:07:14,638 INFO L93 Difference]: Finished difference Result 98 states and 114 transitions. [2020-11-22 13:07:14,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-22 13:07:14,638 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 173 [2020-11-22 13:07:14,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:07:14,639 INFO L225 Difference]: With dead ends: 98 [2020-11-22 13:07:14,639 INFO L226 Difference]: Without dead ends: 0 [2020-11-22 13:07:14,640 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 321 SyntacticMatches, 42 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-11-22 13:07:14,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-22 13:07:14,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-22 13:07:14,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-22 13:07:14,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-22 13:07:14,641 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 173 [2020-11-22 13:07:14,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:07:14,641 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-22 13:07:14,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-11-22 13:07:14,641 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-22 13:07:14,641 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-22 13:07:14,841 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2020-11-22 13:07:14,843 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-22 13:07:15,851 WARN L193 SmtUtils]: Spent 705.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2020-11-22 13:07:16,270 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 30 [2020-11-22 13:07:16,319 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point L41(line 41) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point L40(lines 40 42) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L270 CegarLoopResult]: At program point L39(line 39) the Hoare annotation is: (and (<= ULTIMATE.start_main_~x~0 6) (<= 6 ULTIMATE.start_main_~x~0)) [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point L39-1(line 39) no Hoare annotation was computed. [2020-11-22 13:07:16,320 INFO L270 CegarLoopResult]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 6 ULTIMATE.start_main_~x~0) [2020-11-22 13:07:16,320 INFO L277 CegarLoopResult]: At program point fibo2ENTRY(lines 19 27) the Hoare annotation is: true [2020-11-22 13:07:16,320 INFO L270 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= |fibo2_#in~n| fibo2_~n) (< 1 fibo2_~n) (<= fibo2_~n |fibo2_#in~n|)) [2020-11-22 13:07:16,320 INFO L274 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L270 CegarLoopResult]: At program point L25-2(line 25) the Hoare annotation is: (let ((.cse0 (<= |fibo2_#in~n| fibo2_~n)) (.cse1 (<= fibo2_~n |fibo2_#in~n|))) (and (or (and .cse0 (<= 5 |fibo2_#in~n|)) (and (<= |fibo2_#t~ret9| 2) (<= 2 |fibo2_#t~ret9|)) (and (<= |fibo2_#in~n| 3) .cse0 .cse1)) (or (and (<= |fibo2_#t~ret9| 1) (<= 1 |fibo2_#t~ret9|)) (and (<= 4 fibo2_~n) .cse1)) (or (and .cse0 (<= 6 |fibo2_#in~n|) .cse1) (<= |fibo2_#in~n| 4) (and (<= |fibo2_#t~ret9| 3) (<= 3 |fibo2_#t~ret9|))) (< 1 fibo2_~n))) [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L22(lines 22 26) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L25-3(line 25) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L20(lines 20 26) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L277 CegarLoopResult]: At program point fibo1ENTRY(lines 9 17) the Hoare annotation is: true [2020-11-22 13:07:16,321 INFO L270 CegarLoopResult]: At program point L15(line 15) the Hoare annotation is: (and (<= |fibo1_#in~n| fibo1_~n) (not (<= |fibo1_#in~n| 2)) (<= fibo1_~n |fibo1_#in~n|)) [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L15-1(line 15) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L270 CegarLoopResult]: At program point L15-2(line 15) the Hoare annotation is: (and (or (<= |fibo1_#in~n| 5) (<= 7 |fibo1_#in~n|) (and (<= 5 |fibo1_#t~ret7|) (<= |fibo1_#t~ret7| 5))) (<= |fibo1_#in~n| fibo1_~n) (or (<= 4 |fibo1_#in~n|) (= |fibo1_#t~ret7| 1)) (<= fibo1_~n |fibo1_#in~n|) (or (and (<= |fibo1_#in~n| 3) (<= 3 fibo1_~n)) (<= 5 |fibo1_#in~n|) (and (<= |fibo1_#t~ret7| 2) (<= 2 |fibo1_#t~ret7|)))) [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L12(lines 12 16) no Hoare annotation was computed. [2020-11-22 13:07:16,321 INFO L274 CegarLoopResult]: For program point L15-3(line 15) no Hoare annotation was computed. [2020-11-22 13:07:16,322 INFO L274 CegarLoopResult]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2020-11-22 13:07:16,322 INFO L274 CegarLoopResult]: For program point L10(lines 10 16) no Hoare annotation was computed. [2020-11-22 13:07:16,322 INFO L274 CegarLoopResult]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2020-11-22 13:07:16,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:07:16 BoogieIcfgContainer [2020-11-22 13:07:16,331 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:07:16,332 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:07:16,332 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:07:16,332 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:07:16,333 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:49" (3/4) ... [2020-11-22 13:07:16,336 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-22 13:07:16,341 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2020-11-22 13:07:16,341 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2020-11-22 13:07:16,345 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-11-22 13:07:16,345 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-22 13:07:16,345 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-22 13:07:16,346 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-22 13:07:16,373 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_574c3467-979c-45d9-9dec-abb2ea20846b/bin/utaipan/witness.graphml [2020-11-22 13:07:16,373 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:07:16,374 INFO L168 Benchmark]: Toolchain (without parser) took 27444.63 ms. Allocated memory was 90.2 MB in the beginning and 490.7 MB in the end (delta: 400.6 MB). Free memory was 57.4 MB in the beginning and 281.4 MB in the end (delta: -224.0 MB). Peak memory consumption was 177.6 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,375 INFO L168 Benchmark]: CDTParser took 1.45 ms. Allocated memory is still 90.2 MB. Free memory was 67.9 MB in the beginning and 67.9 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:07:16,375 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.00 ms. Allocated memory is still 90.2 MB. Free memory was 57.2 MB in the beginning and 67.8 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,375 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.49 ms. Allocated memory is still 90.2 MB. Free memory was 67.8 MB in the beginning and 66.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:07:16,376 INFO L168 Benchmark]: Boogie Preprocessor took 37.31 ms. Allocated memory is still 90.2 MB. Free memory was 66.6 MB in the beginning and 65.7 MB in the end (delta: 865.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,376 INFO L168 Benchmark]: RCFGBuilder took 453.30 ms. Allocated memory is still 90.2 MB. Free memory was 65.3 MB in the beginning and 51.0 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,377 INFO L168 Benchmark]: TraceAbstraction took 26616.31 ms. Allocated memory was 90.2 MB in the beginning and 490.7 MB in the end (delta: 400.6 MB). Free memory was 50.6 MB in the beginning and 284.5 MB in the end (delta: -233.9 MB). Peak memory consumption was 230.9 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,377 INFO L168 Benchmark]: Witness Printer took 41.21 ms. Allocated memory is still 490.7 MB. Free memory was 284.5 MB in the beginning and 281.4 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:07:16,379 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.45 ms. Allocated memory is still 90.2 MB. Free memory was 67.9 MB in the beginning and 67.9 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 255.00 ms. Allocated memory is still 90.2 MB. Free memory was 57.2 MB in the beginning and 67.8 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.49 ms. Allocated memory is still 90.2 MB. Free memory was 67.8 MB in the beginning and 66.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 37.31 ms. Allocated memory is still 90.2 MB. Free memory was 66.6 MB in the beginning and 65.7 MB in the end (delta: 865.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 453.30 ms. Allocated memory is still 90.2 MB. Free memory was 65.3 MB in the beginning and 51.0 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 26616.31 ms. Allocated memory was 90.2 MB in the beginning and 490.7 MB in the end (delta: 400.6 MB). Free memory was 50.6 MB in the beginning and 284.5 MB in the end (delta: -233.9 MB). Peak memory consumption was 230.9 MB. Max. memory is 16.1 GB. * Witness Printer took 41.21 ms. Allocated memory is still 490.7 MB. Free memory was 284.5 MB in the beginning and 281.4 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: 6 <= x - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 25.0s, OverallIterations: 14, TraceHistogramMax: 17, AutomataDifference: 4.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 350 SDtfs, 689 SDslu, 3010 SDs, 0 SdLazy, 3443 SolverSat, 672 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3044 GetRequests, 2619 SyntacticMatches, 127 SemanticMatches, 298 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 5.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=135occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 14 MinimizatonAttempts, 131 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 224 PreInvPairs, 347 NumberOfFragments, 144 HoareAnnotationTreeSize, 224 FomulaSimplifications, 2491 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 8 FomulaSimplificationsInter, 3904 FormulaSimplificationTreeSizeReductionInter, 1.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 14.6s InterpolantComputationTime, 2803 NumberOfCodeBlocks, 2650 NumberOfCodeBlocksAsserted, 38 NumberOfCheckSat, 4157 ConstructedInterpolants, 0 QuantifiedInterpolants, 1253877 SizeOfPredicates, 61 NumberOfNonLiveVariables, 3071 ConjunctsInSsa, 221 ConjunctsInUnsatCore, 38 InterpolantComputations, 2 PerfectInterpolantSequences, 13692/18129 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 correct! Received shutdown request...