./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/id_i20_o20_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i20_o20_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7d05936c4bb1bb97a4b24ebc11d02c0e844c743b ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-10-26 23:50:12,579 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 23:50:12,580 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 23:50:12,590 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 23:50:12,590 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 23:50:12,591 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 23:50:12,591 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 23:50:12,593 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 23:50:12,594 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 23:50:12,594 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 23:50:12,595 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 23:50:12,595 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 23:50:12,596 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 23:50:12,596 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 23:50:12,597 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 23:50:12,597 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 23:50:12,598 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 23:50:12,599 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 23:50:12,600 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 23:50:12,602 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 23:50:12,603 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 23:50:12,604 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 23:50:12,605 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 23:50:12,606 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 23:50:12,606 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 23:50:12,607 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 23:50:12,608 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 23:50:12,608 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 23:50:12,609 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 23:50:12,610 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 23:50:12,611 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 23:50:12,611 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 23:50:12,611 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 23:50:12,612 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 23:50:12,612 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 23:50:12,613 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 23:50:12,614 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-26 23:50:12,631 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 23:50:12,631 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 23:50:12,632 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 23:50:12,632 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-26 23:50:12,632 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-26 23:50:12,632 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-26 23:50:12,632 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-26 23:50:12,632 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-26 23:50:12,633 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-26 23:50:12,633 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-26 23:50:12,633 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-26 23:50:12,633 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 23:50:12,634 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 23:50:12,635 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 23:50:12,635 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 23:50:12,636 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 23:50:12,636 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 23:50:12,637 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 23:50:12,637 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/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(__VERIFIER_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 -> 7d05936c4bb1bb97a4b24ebc11d02c0e844c743b [2018-10-26 23:50:12,665 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 23:50:12,676 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 23:50:12,679 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 23:50:12,680 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 23:50:12,680 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 23:50:12,681 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i20_o20_false-unreach-call_true-termination.c [2018-10-26 23:50:12,724 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/data/b4b6ff5ce/d23c80d0de294e378aa8d564dc71b3f3/FLAGf260568a7 [2018-10-26 23:50:13,104 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 23:50:13,109 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/sv-benchmarks/c/recursive-simple/id_i20_o20_false-unreach-call_true-termination.c [2018-10-26 23:50:13,114 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/data/b4b6ff5ce/d23c80d0de294e378aa8d564dc71b3f3/FLAGf260568a7 [2018-10-26 23:50:13,128 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/data/b4b6ff5ce/d23c80d0de294e378aa8d564dc71b3f3 [2018-10-26 23:50:13,131 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 23:50:13,133 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-26 23:50:13,134 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 23:50:13,134 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 23:50:13,137 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 23:50:13,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56f523a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13, skipping insertion in model container [2018-10-26 23:50:13,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,151 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 23:50:13,166 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 23:50:13,303 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:50:13,306 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 23:50:13,318 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:50:13,333 INFO L193 MainTranslator]: Completed translation [2018-10-26 23:50:13,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13 WrapperNode [2018-10-26 23:50:13,333 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 23:50:13,334 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 23:50:13,335 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 23:50:13,335 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 23:50:13,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,346 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,351 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 23:50:13,352 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 23:50:13,352 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 23:50:13,352 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 23:50:13,360 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,361 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,362 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,365 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,367 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,368 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... [2018-10-26 23:50:13,369 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 23:50:13,370 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 23:50:13,371 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 23:50:13,371 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 23:50:13,372 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/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 [2018-10-26 23:50:13,481 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 23:50:13,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 23:50:13,481 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 23:50:13,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 23:50:13,481 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 23:50:13,481 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 23:50:13,481 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-10-26 23:50:13,481 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-10-26 23:50:13,620 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 23:50:13,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:50:13 BoogieIcfgContainer [2018-10-26 23:50:13,620 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 23:50:13,621 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 23:50:13,621 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 23:50:13,624 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 23:50:13,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 11:50:13" (1/3) ... [2018-10-26 23:50:13,625 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@294582e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:50:13, skipping insertion in model container [2018-10-26 23:50:13,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:50:13" (2/3) ... [2018-10-26 23:50:13,626 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@294582e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:50:13, skipping insertion in model container [2018-10-26 23:50:13,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:50:13" (3/3) ... [2018-10-26 23:50:13,628 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i20_o20_false-unreach-call_true-termination.c [2018-10-26 23:50:13,636 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 23:50:13,642 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 23:50:13,655 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 23:50:13,681 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 23:50:13,681 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 23:50:13,681 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 23:50:13,681 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 23:50:13,681 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 23:50:13,681 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 23:50:13,681 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 23:50:13,681 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 23:50:13,697 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-26 23:50:13,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-26 23:50:13,702 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:13,703 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:13,705 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:13,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:13,709 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-10-26 23:50:13,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:13,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:13,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:13,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:13,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:13,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:13,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 23:50:13,923 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:50:13,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-26 23:50:13,923 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 23:50:13,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 23:50:13,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 23:50:13,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 23:50:13,935 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-10-26 23:50:14,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:14,057 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-10-26 23:50:14,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 23:50:14,058 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-26 23:50:14,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:14,065 INFO L225 Difference]: With dead ends: 30 [2018-10-26 23:50:14,065 INFO L226 Difference]: Without dead ends: 18 [2018-10-26 23:50:14,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-26 23:50:14,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-26 23:50:14,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-26 23:50:14,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-26 23:50:14,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-26 23:50:14,099 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-26 23:50:14,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:14,100 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-26 23:50:14,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 23:50:14,100 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-26 23:50:14,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 23:50:14,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:14,102 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:14,102 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:14,102 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:14,102 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-10-26 23:50:14,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:14,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:14,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:14,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:14,103 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:14,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 23:50:14,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:14,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:14,181 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-26 23:50:14,182 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-10-26 23:50:14,219 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 23:50:14,219 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 23:50:14,362 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-26 23:50:14,363 INFO L272 AbstractInterpreter]: Visited 16 different actions 56 times. Never merged. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-26 23:50:14,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:14,390 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-26 23:50:14,442 INFO L227 lantSequenceWeakener]: Weakened 10 states. On average, predicates are now at 58.33% of their original sizes. [2018-10-26 23:50:14,442 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-26 23:50:14,832 INFO L415 sIntCurrentIteration]: We unified 18 AI predicates to 18 [2018-10-26 23:50:14,832 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-26 23:50:14,833 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-26 23:50:14,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [12] imperfect sequences [6] total 16 [2018-10-26 23:50:14,833 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 23:50:14,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-26 23:50:14,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-26 23:50:14,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-26 23:50:14,835 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2018-10-26 23:50:15,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:15,467 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2018-10-26 23:50:15,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 23:50:15,468 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2018-10-26 23:50:15,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:15,468 INFO L225 Difference]: With dead ends: 39 [2018-10-26 23:50:15,469 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 23:50:15,469 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2018-10-26 23:50:15,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 23:50:15,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2018-10-26 23:50:15,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-26 23:50:15,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-26 23:50:15,477 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2018-10-26 23:50:15,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:15,477 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-26 23:50:15,477 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-26 23:50:15,477 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-26 23:50:15,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-26 23:50:15,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:15,478 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:15,479 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:15,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:15,479 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-10-26 23:50:15,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:15,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:15,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:15,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:15,480 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:15,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:15,570 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 23:50:15,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:15,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:15,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:15,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:15,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:15,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:15,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:50:15,585 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:50:15,638 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-26 23:50:15,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:15,647 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:15,687 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 23:50:15,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:16,189 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-26 23:50:16,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:16,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-10-26 23:50:16,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:16,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 23:50:16,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 23:50:16,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-10-26 23:50:16,207 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 7 states. [2018-10-26 23:50:16,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:16,285 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2018-10-26 23:50:16,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 23:50:16,286 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-10-26 23:50:16,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:16,286 INFO L225 Difference]: With dead ends: 49 [2018-10-26 23:50:16,287 INFO L226 Difference]: Without dead ends: 39 [2018-10-26 23:50:16,287 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-10-26 23:50:16,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-26 23:50:16,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2018-10-26 23:50:16,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 23:50:16,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-26 23:50:16,292 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2018-10-26 23:50:16,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:16,293 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-26 23:50:16,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 23:50:16,293 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-26 23:50:16,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 23:50:16,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:16,294 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:16,294 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:16,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:16,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-10-26 23:50:16,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:16,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:16,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:16,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:16,295 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:16,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:16,412 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 23:50:16,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:16,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:16,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:16,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:16,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:16,413 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:16,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:50:16,428 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:50:16,444 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:50:16,444 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:16,446 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:16,523 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 23:50:16,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:16,971 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-26 23:50:16,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:16,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 11] total 22 [2018-10-26 23:50:16,987 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:16,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-26 23:50:16,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-26 23:50:16,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2018-10-26 23:50:16,988 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2018-10-26 23:50:17,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:17,157 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2018-10-26 23:50:17,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 23:50:17,157 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2018-10-26 23:50:17,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:17,158 INFO L225 Difference]: With dead ends: 52 [2018-10-26 23:50:17,159 INFO L226 Difference]: Without dead ends: 42 [2018-10-26 23:50:17,159 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=651, Unknown=0, NotChecked=0, Total=812 [2018-10-26 23:50:17,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-26 23:50:17,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 33. [2018-10-26 23:50:17,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-26 23:50:17,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-10-26 23:50:17,166 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2018-10-26 23:50:17,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:17,166 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-10-26 23:50:17,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-26 23:50:17,166 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-10-26 23:50:17,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-26 23:50:17,168 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:17,168 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:17,168 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:17,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:17,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-10-26 23:50:17,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:17,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:17,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:17,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:17,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:17,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:17,332 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 23:50:17,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:17,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:17,332 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:17,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:17,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:17,333 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-26 23:50:17,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:17,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:17,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:17,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:17,378 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 23:50:17,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:18,009 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-26 23:50:18,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:18,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-10-26 23:50:18,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:18,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 23:50:18,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 23:50:18,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-10-26 23:50:18,026 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 9 states. [2018-10-26 23:50:18,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:18,084 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2018-10-26 23:50:18,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 23:50:18,085 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-10-26 23:50:18,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:18,086 INFO L225 Difference]: With dead ends: 55 [2018-10-26 23:50:18,086 INFO L226 Difference]: Without dead ends: 45 [2018-10-26 23:50:18,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-26 23:50:18,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-26 23:50:18,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2018-10-26 23:50:18,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-26 23:50:18,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-10-26 23:50:18,093 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 37 [2018-10-26 23:50:18,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:18,093 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-10-26 23:50:18,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 23:50:18,093 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-10-26 23:50:18,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-26 23:50:18,094 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:18,094 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:18,094 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:18,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:18,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-10-26 23:50:18,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:18,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:18,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:18,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:18,096 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:18,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 23:50:18,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:18,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:18,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:18,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:18,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:18,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:18,207 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:50:18,208 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:50:18,256 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-26 23:50:18,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:18,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:18,458 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 23:50:18,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 23:50:19,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:19,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 15] total 30 [2018-10-26 23:50:19,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:19,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-26 23:50:19,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-26 23:50:19,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2018-10-26 23:50:19,604 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 23 states. [2018-10-26 23:50:19,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:19,879 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2018-10-26 23:50:19,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 23:50:19,880 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2018-10-26 23:50:19,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:19,881 INFO L225 Difference]: With dead ends: 58 [2018-10-26 23:50:19,881 INFO L226 Difference]: Without dead ends: 48 [2018-10-26 23:50:19,881 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=321, Invalid=1319, Unknown=0, NotChecked=0, Total=1640 [2018-10-26 23:50:19,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-26 23:50:19,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2018-10-26 23:50:19,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-26 23:50:19,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-26 23:50:19,889 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 43 [2018-10-26 23:50:19,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:19,889 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-26 23:50:19,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-26 23:50:19,889 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-26 23:50:19,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-26 23:50:19,890 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:19,890 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:19,891 INFO L424 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:19,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:19,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-10-26 23:50:19,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:19,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:19,892 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:19,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:20,110 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 23:50:20,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:20,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:20,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:20,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:20,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:20,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:20,117 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:50:20,117 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:50:20,142 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:50:20,142 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:20,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:20,291 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 23:50:20,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:21,313 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 23:50:21,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:21,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 17] total 34 [2018-10-26 23:50:21,329 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:21,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-26 23:50:21,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-26 23:50:21,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 23:50:21,330 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 26 states. [2018-10-26 23:50:21,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:21,553 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2018-10-26 23:50:21,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-26 23:50:21,553 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 49 [2018-10-26 23:50:21,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:21,554 INFO L225 Difference]: With dead ends: 61 [2018-10-26 23:50:21,554 INFO L226 Difference]: Without dead ends: 51 [2018-10-26 23:50:21,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 68 SyntacticMatches, 14 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=422, Invalid=1740, Unknown=0, NotChecked=0, Total=2162 [2018-10-26 23:50:21,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-26 23:50:21,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2018-10-26 23:50:21,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-26 23:50:21,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-10-26 23:50:21,561 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 49 [2018-10-26 23:50:21,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:21,562 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-10-26 23:50:21,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-26 23:50:21,562 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-10-26 23:50:21,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-26 23:50:21,564 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:21,564 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:21,564 INFO L424 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:21,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:21,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-10-26 23:50:21,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:21,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:21,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:21,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:21,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:21,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:21,686 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 23:50:21,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:21,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:21,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:21,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:21,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:21,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:21,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:21,696 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 23:50:21,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:21,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:21,842 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 23:50:21,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:22,605 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2018-10-26 23:50:23,475 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-26 23:50:23,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:23,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 19] total 38 [2018-10-26 23:50:23,499 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:23,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-26 23:50:23,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-26 23:50:23,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1211, Unknown=0, NotChecked=0, Total=1406 [2018-10-26 23:50:23,501 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 29 states. [2018-10-26 23:50:23,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:23,915 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2018-10-26 23:50:23,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 23:50:23,916 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 55 [2018-10-26 23:50:23,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:23,917 INFO L225 Difference]: With dead ends: 64 [2018-10-26 23:50:23,917 INFO L226 Difference]: Without dead ends: 54 [2018-10-26 23:50:23,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 76 SyntacticMatches, 16 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=537, Invalid=2219, Unknown=0, NotChecked=0, Total=2756 [2018-10-26 23:50:23,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-26 23:50:23,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-10-26 23:50:23,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 23:50:23,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-10-26 23:50:23,921 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 55 [2018-10-26 23:50:23,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:23,921 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-10-26 23:50:23,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-26 23:50:23,921 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-10-26 23:50:23,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-26 23:50:23,924 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:23,924 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:23,925 INFO L424 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:23,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:23,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-10-26 23:50:23,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:23,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:23,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:23,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:23,926 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:23,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:24,036 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 23:50:24,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:24,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:24,036 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:24,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:24,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:24,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:24,043 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:50:24,043 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:50:24,070 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-26 23:50:24,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:24,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:24,307 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 23:50:24,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:26,132 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 23:50:26,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:26,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 51 [2018-10-26 23:50:26,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:26,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-26 23:50:26,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-26 23:50:26,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=2140, Unknown=0, NotChecked=0, Total=2550 [2018-10-26 23:50:26,149 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 32 states. [2018-10-26 23:50:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:26,436 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2018-10-26 23:50:26,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-26 23:50:26,437 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 61 [2018-10-26 23:50:26,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:26,437 INFO L225 Difference]: With dead ends: 67 [2018-10-26 23:50:26,438 INFO L226 Difference]: Without dead ends: 57 [2018-10-26 23:50:26,439 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=832, Invalid=3724, Unknown=0, NotChecked=0, Total=4556 [2018-10-26 23:50:26,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-26 23:50:26,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 48. [2018-10-26 23:50:26,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-26 23:50:26,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-10-26 23:50:26,445 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 61 [2018-10-26 23:50:26,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:26,445 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-10-26 23:50:26,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-26 23:50:26,445 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-10-26 23:50:26,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-26 23:50:26,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:26,448 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:26,448 INFO L424 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:26,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:26,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-10-26 23:50:26,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:26,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:26,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:26,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:26,449 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:26,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:26,590 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 23:50:26,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:26,591 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:26,591 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:26,591 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:26,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:26,591 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:26,600 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:50:26,600 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:50:26,633 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:50:26,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:26,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:26,647 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 23:50:26,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:28,180 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2018-10-26 23:50:29,026 WARN L179 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2018-10-26 23:50:29,258 WARN L179 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2018-10-26 23:50:29,495 WARN L179 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-10-26 23:50:29,733 WARN L179 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-10-26 23:50:30,011 WARN L179 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-10-26 23:50:30,287 WARN L179 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-10-26 23:50:30,568 WARN L179 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-10-26 23:50:31,085 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-26 23:50:31,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:31,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-10-26 23:50:31,101 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:31,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-26 23:50:31,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-26 23:50:31,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-10-26 23:50:31,102 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 14 states. [2018-10-26 23:50:31,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:31,196 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2018-10-26 23:50:31,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-26 23:50:31,197 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-10-26 23:50:31,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:31,198 INFO L225 Difference]: With dead ends: 70 [2018-10-26 23:50:31,198 INFO L226 Difference]: Without dead ends: 60 [2018-10-26 23:50:31,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-10-26 23:50:31,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-26 23:50:31,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2018-10-26 23:50:31,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-26 23:50:31,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-10-26 23:50:31,206 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 67 [2018-10-26 23:50:31,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:31,207 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-10-26 23:50:31,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-26 23:50:31,207 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-10-26 23:50:31,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-26 23:50:31,208 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:31,208 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:31,208 INFO L424 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:31,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:31,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-10-26 23:50:31,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:31,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:31,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:31,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:31,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:31,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:31,321 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 23:50:31,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:31,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:31,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:31,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:31,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:31,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:31,329 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:31,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 23:50:31,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:31,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:31,374 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 23:50:31,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:34,344 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-26 23:50:34,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:34,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-10-26 23:50:34,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:34,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 23:50:34,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 23:50:34,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-10-26 23:50:34,372 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 15 states. [2018-10-26 23:50:34,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:34,663 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2018-10-26 23:50:34,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 23:50:34,664 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-10-26 23:50:34,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:34,665 INFO L225 Difference]: With dead ends: 73 [2018-10-26 23:50:34,665 INFO L226 Difference]: Without dead ends: 63 [2018-10-26 23:50:34,666 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-10-26 23:50:34,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-26 23:50:34,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 54. [2018-10-26 23:50:34,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-26 23:50:34,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-10-26 23:50:34,674 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 73 [2018-10-26 23:50:34,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:34,674 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-10-26 23:50:34,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 23:50:34,674 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-10-26 23:50:34,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-26 23:50:34,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:34,675 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:34,675 INFO L424 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:34,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:34,676 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-10-26 23:50:34,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:34,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:34,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:34,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:34,676 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:34,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:34,928 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 23:50:34,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:34,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:34,928 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:34,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:34,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:34,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:34,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:50:34,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:50:34,954 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-26 23:50:34,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:34,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:34,990 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 23:50:34,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:38,846 WARN L179 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2018-10-26 23:50:39,052 WARN L179 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2018-10-26 23:50:39,405 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-26 23:50:39,435 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:39,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-10-26 23:50:39,435 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:39,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-26 23:50:39,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-26 23:50:39,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-10-26 23:50:39,436 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 16 states. [2018-10-26 23:50:39,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:39,781 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2018-10-26 23:50:39,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-26 23:50:39,781 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-10-26 23:50:39,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:39,782 INFO L225 Difference]: With dead ends: 76 [2018-10-26 23:50:39,782 INFO L226 Difference]: Without dead ends: 66 [2018-10-26 23:50:39,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-10-26 23:50:39,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-26 23:50:39,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 57. [2018-10-26 23:50:39,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-26 23:50:39,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-26 23:50:39,790 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 79 [2018-10-26 23:50:39,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:39,790 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-26 23:50:39,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-26 23:50:39,790 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-26 23:50:39,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-26 23:50:39,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:39,791 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:39,791 INFO L424 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:39,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:39,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-10-26 23:50:39,791 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:39,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:39,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:39,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:39,792 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:40,064 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 23:50:40,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:40,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:40,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:40,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:40,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:40,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:40,071 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:50:40,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:50:40,087 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:50:40,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:40,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:40,327 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 23:50:40,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:40,575 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-26 23:50:40,679 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-26 23:50:40,799 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 23:50:40,942 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 23:50:41,120 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-10-26 23:50:41,269 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-10-26 23:50:42,065 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-10-26 23:50:43,941 WARN L179 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2018-10-26 23:50:46,552 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-26 23:50:46,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:46,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 17, 29] total 58 [2018-10-26 23:50:46,568 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:46,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-26 23:50:46,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-26 23:50:46,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=2866, Unknown=0, NotChecked=0, Total=3306 [2018-10-26 23:50:46,569 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 44 states. [2018-10-26 23:50:47,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:47,030 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2018-10-26 23:50:47,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-26 23:50:47,031 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 85 [2018-10-26 23:50:47,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:47,032 INFO L225 Difference]: With dead ends: 79 [2018-10-26 23:50:47,032 INFO L226 Difference]: Without dead ends: 69 [2018-10-26 23:50:47,033 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 116 SyntacticMatches, 26 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1860 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1322, Invalid=5484, Unknown=0, NotChecked=0, Total=6806 [2018-10-26 23:50:47,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-26 23:50:47,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2018-10-26 23:50:47,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-26 23:50:47,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-26 23:50:47,038 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 85 [2018-10-26 23:50:47,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:47,041 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-26 23:50:47,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-26 23:50:47,042 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-26 23:50:47,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-26 23:50:47,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:47,043 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:47,043 INFO L424 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:47,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:47,043 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-10-26 23:50:47,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:47,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:47,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:50:47,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:47,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:47,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:47,292 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 23:50:47,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:47,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:47,293 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:47,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:47,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:47,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:47,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:47,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 23:50:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:47,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:47,611 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 23:50:47,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:50:54,209 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-26 23:50:54,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:50:54,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 18, 31] total 62 [2018-10-26 23:50:54,225 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:50:54,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-26 23:50:54,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-26 23:50:54,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=3281, Unknown=0, NotChecked=0, Total=3782 [2018-10-26 23:50:54,226 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 47 states. [2018-10-26 23:50:54,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:50:54,787 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2018-10-26 23:50:54,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-26 23:50:54,788 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 91 [2018-10-26 23:50:54,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:50:54,788 INFO L225 Difference]: With dead ends: 82 [2018-10-26 23:50:54,788 INFO L226 Difference]: Without dead ends: 72 [2018-10-26 23:50:54,790 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 124 SyntacticMatches, 28 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2165 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1521, Invalid=6311, Unknown=0, NotChecked=0, Total=7832 [2018-10-26 23:50:54,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-26 23:50:54,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 63. [2018-10-26 23:50:54,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-26 23:50:54,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-10-26 23:50:54,795 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 91 [2018-10-26 23:50:54,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:50:54,795 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-10-26 23:50:54,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-26 23:50:54,795 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-10-26 23:50:54,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-26 23:50:54,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:50:54,796 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:50:54,796 INFO L424 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:50:54,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:50:54,796 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-10-26 23:50:54,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:50:54,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:54,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:50:54,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:50:54,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:50:54,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:50:55,126 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 23:50:55,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:55,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:50:55,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:50:55,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:50:55,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:50:55,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:50:55,133 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:50:55,133 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:50:55,199 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-26 23:50:55,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:50:55,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:50:55,468 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 23:50:55,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:51:03,385 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-26 23:51:03,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:51:03,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 19, 33] total 66 [2018-10-26 23:51:03,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:51:03,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-26 23:51:03,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-26 23:51:03,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=3724, Unknown=0, NotChecked=0, Total=4290 [2018-10-26 23:51:03,403 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 50 states. [2018-10-26 23:51:03,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:51:03,959 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2018-10-26 23:51:03,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-26 23:51:03,959 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 97 [2018-10-26 23:51:03,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:51:03,960 INFO L225 Difference]: With dead ends: 85 [2018-10-26 23:51:03,960 INFO L226 Difference]: Without dead ends: 75 [2018-10-26 23:51:03,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 132 SyntacticMatches, 30 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2493 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1734, Invalid=7196, Unknown=0, NotChecked=0, Total=8930 [2018-10-26 23:51:03,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-26 23:51:03,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 66. [2018-10-26 23:51:03,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-26 23:51:03,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-10-26 23:51:03,965 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 97 [2018-10-26 23:51:03,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:51:03,965 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-10-26 23:51:03,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-26 23:51:03,965 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-10-26 23:51:03,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-26 23:51:03,971 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:51:03,971 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:51:03,971 INFO L424 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:51:03,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:51:03,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-10-26 23:51:03,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:51:03,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:03,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:51:03,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:03,973 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:51:03,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:04,249 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 23:51:04,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:04,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:51:04,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:51:04,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:51:04,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:04,250 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:51:04,260 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:51:04,260 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:51:04,279 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:51:04,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:51:04,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:51:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 23:51:04,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:51:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-26 23:51:13,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:51:13,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 20, 35] total 70 [2018-10-26 23:51:13,777 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:51:13,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-26 23:51:13,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-26 23:51:13,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=4195, Unknown=0, NotChecked=0, Total=4830 [2018-10-26 23:51:13,779 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 53 states. [2018-10-26 23:51:14,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:51:14,439 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2018-10-26 23:51:14,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-26 23:51:14,440 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 103 [2018-10-26 23:51:14,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:51:14,440 INFO L225 Difference]: With dead ends: 88 [2018-10-26 23:51:14,441 INFO L226 Difference]: Without dead ends: 78 [2018-10-26 23:51:14,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 140 SyntacticMatches, 32 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2844 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1961, Invalid=8139, Unknown=0, NotChecked=0, Total=10100 [2018-10-26 23:51:14,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-26 23:51:14,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 69. [2018-10-26 23:51:14,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-26 23:51:14,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-26 23:51:14,447 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 103 [2018-10-26 23:51:14,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:51:14,447 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-26 23:51:14,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-26 23:51:14,447 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-26 23:51:14,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-26 23:51:14,448 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:51:14,448 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:51:14,448 INFO L424 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:51:14,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:51:14,449 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-10-26 23:51:14,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:51:14,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:14,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:51:14,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:14,450 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:51:14,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:15,459 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 23:51:15,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:15,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:51:15,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:51:15,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:51:15,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:15,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:51:15,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:51:15,484 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 23:51:15,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:15,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:51:15,859 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 23:51:15,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:51:22,617 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-26 23:51:27,054 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-10-26 23:51:27,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:51:27,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 21, 37] total 74 [2018-10-26 23:51:27,070 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:51:27,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-26 23:51:27,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-26 23:51:27,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=4694, Unknown=0, NotChecked=0, Total=5402 [2018-10-26 23:51:27,071 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 56 states. [2018-10-26 23:51:27,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:51:27,760 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2018-10-26 23:51:27,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-26 23:51:27,761 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 109 [2018-10-26 23:51:27,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:51:27,762 INFO L225 Difference]: With dead ends: 91 [2018-10-26 23:51:27,762 INFO L226 Difference]: Without dead ends: 81 [2018-10-26 23:51:27,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 148 SyntacticMatches, 34 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3218 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2202, Invalid=9140, Unknown=0, NotChecked=0, Total=11342 [2018-10-26 23:51:27,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-26 23:51:27,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2018-10-26 23:51:27,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-26 23:51:27,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-10-26 23:51:27,777 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 109 [2018-10-26 23:51:27,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:51:27,777 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-10-26 23:51:27,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-26 23:51:27,777 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-10-26 23:51:27,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-26 23:51:27,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:51:27,781 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:51:27,782 INFO L424 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:51:27,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:51:27,782 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2018-10-26 23:51:27,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:51:27,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:27,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:51:27,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:27,783 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:51:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-26 23:51:28,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:28,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:51:28,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:51:28,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:51:28,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:28,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:51:28,035 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:51:28,035 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 23:51:28,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-26 23:51:28,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:51:28,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:51:28,107 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-26 23:51:28,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:51:40,903 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-26 23:51:40,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:51:40,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-10-26 23:51:40,941 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:51:40,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-26 23:51:40,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-26 23:51:40,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-10-26 23:51:40,942 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 22 states. [2018-10-26 23:51:41,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:51:41,164 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2018-10-26 23:51:41,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-26 23:51:41,165 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-10-26 23:51:41,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:51:41,165 INFO L225 Difference]: With dead ends: 94 [2018-10-26 23:51:41,165 INFO L226 Difference]: Without dead ends: 84 [2018-10-26 23:51:41,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-10-26 23:51:41,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-26 23:51:41,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 75. [2018-10-26 23:51:41,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-26 23:51:41,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-10-26 23:51:41,171 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 115 [2018-10-26 23:51:41,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:51:41,171 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-10-26 23:51:41,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-26 23:51:41,171 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-10-26 23:51:41,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-26 23:51:41,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:51:41,172 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:51:41,172 INFO L424 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:51:41,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:51:41,173 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2018-10-26 23:51:41,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:51:41,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:41,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:51:41,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:41,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:51:41,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:41,506 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-26 23:51:41,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:41,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:51:41,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:51:41,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:51:41,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:41,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:51:41,513 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:51:41,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 23:51:41,574 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:51:41,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:51:41,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:51:41,592 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-26 23:51:41,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:51:56,509 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-10-26 23:51:56,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:51:56,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-10-26 23:51:56,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:51:56,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-26 23:51:56,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-26 23:51:56,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-10-26 23:51:56,528 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 23 states. [2018-10-26 23:51:56,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:51:56,819 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2018-10-26 23:51:56,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-26 23:51:56,820 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-10-26 23:51:56,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:51:56,821 INFO L225 Difference]: With dead ends: 97 [2018-10-26 23:51:56,821 INFO L226 Difference]: Without dead ends: 87 [2018-10-26 23:51:56,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-10-26 23:51:56,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-26 23:51:56,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 78. [2018-10-26 23:51:56,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-26 23:51:56,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-10-26 23:51:56,825 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 121 [2018-10-26 23:51:56,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:51:56,825 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-10-26 23:51:56,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-26 23:51:56,825 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-10-26 23:51:56,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-26 23:51:56,826 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:51:56,826 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:51:56,830 INFO L424 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:51:56,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:51:56,830 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2018-10-26 23:51:56,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:51:56,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:56,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:51:56,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:51:56,831 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:51:56,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:57,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-26 23:51:57,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:57,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 23:51:57,598 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 23:51:57,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 23:51:57,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:51:57,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 23:51:57,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:51:57,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 23:51:57,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:51:57,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:51:57,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-26 23:51:57,673 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:52:15,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-26 23:52:15,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 23:52:15,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 44 [2018-10-26 23:52:15,306 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 23:52:15,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-26 23:52:15,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-26 23:52:15,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1387, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 23:52:15,307 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 24 states. [2018-10-26 23:52:15,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:52:15,546 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2018-10-26 23:52:15,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-26 23:52:15,547 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-10-26 23:52:15,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:52:15,548 INFO L225 Difference]: With dead ends: 100 [2018-10-26 23:52:15,548 INFO L226 Difference]: Without dead ends: 90 [2018-10-26 23:52:15,548 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 41 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1365, Invalid=2667, Unknown=0, NotChecked=0, Total=4032 [2018-10-26 23:52:15,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-26 23:52:15,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2018-10-26 23:52:15,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-26 23:52:15,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-10-26 23:52:15,552 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 127 [2018-10-26 23:52:15,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:52:15,552 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-10-26 23:52:15,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-26 23:52:15,552 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-10-26 23:52:15,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-10-26 23:52:15,553 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:52:15,553 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:52:15,553 INFO L424 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:52:15,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:52:15,553 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2018-10-26 23:52:15,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 23:52:15,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:52:15,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:52:15,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:52:15,559 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 23:52:15,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:52:15,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:52:15,591 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 23:52:15,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 11:52:15 BoogieIcfgContainer [2018-10-26 23:52:15,617 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 23:52:15,617 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 23:52:15,617 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 23:52:15,618 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 23:52:15,620 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:50:13" (3/4) ... [2018-10-26 23:52:15,622 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-26 23:52:15,668 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_b0675ac2-3f11-4ddb-a8f9-e58a1a233e7e/bin-2019/utaipan/witness.graphml [2018-10-26 23:52:15,668 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 23:52:15,669 INFO L168 Benchmark]: Toolchain (without parser) took 122536.46 ms. Allocated memory was 1.0 GB in the beginning and 2.3 GB in the end (delta: 1.2 GB). Free memory was 958.0 MB in the beginning and 1.7 GB in the end (delta: -742.1 MB). Peak memory consumption was 493.6 MB. Max. memory is 11.5 GB. [2018-10-26 23:52:15,669 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:52:15,670 INFO L168 Benchmark]: CACSL2BoogieTranslator took 199.68 ms. Allocated memory is still 1.0 GB. Free memory was 958.0 MB in the beginning and 947.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:52:15,670 INFO L168 Benchmark]: Boogie Procedure Inliner took 17.19 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:52:15,670 INFO L168 Benchmark]: Boogie Preprocessor took 17.71 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:52:15,670 INFO L168 Benchmark]: RCFGBuilder took 250.79 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 96.5 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -137.3 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. [2018-10-26 23:52:15,671 INFO L168 Benchmark]: TraceAbstraction took 121995.90 ms. Allocated memory was 1.1 GB in the beginning and 2.3 GB in the end (delta: 1.1 GB). Free memory was 1.1 GB in the beginning and 1.7 GB in the end (delta: -615.6 MB). Peak memory consumption was 523.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:52:15,671 INFO L168 Benchmark]: Witness Printer took 50.90 ms. Allocated memory is still 2.3 GB. Free memory is still 1.7 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:52:15,673 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 199.68 ms. Allocated memory is still 1.0 GB. Free memory was 958.0 MB in the beginning and 947.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 17.19 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 17.71 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 250.79 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 96.5 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -137.3 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 121995.90 ms. Allocated memory was 1.1 GB in the beginning and 2.3 GB in the end (delta: 1.1 GB). Free memory was 1.1 GB in the beginning and 1.7 GB in the end (delta: -615.6 MB). Peak memory consumption was 523.7 MB. Max. memory is 11.5 GB. * Witness Printer took 50.90 ms. Allocated memory is still 2.3 GB. Free memory is still 1.7 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 20; VAL [input=20] [L11] CALL, EXPR id(input) VAL [\old(x)=20] [L5] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L6] CALL, EXPR id(x-1) VAL [\old(x)=19] [L5] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L6] CALL, EXPR id(x-1) VAL [\old(x)=18] [L5] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L6] CALL, EXPR id(x-1) VAL [\old(x)=17] [L5] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L6] CALL, EXPR id(x-1) VAL [\old(x)=16] [L5] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L6] CALL, EXPR id(x-1) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] RET return 0; VAL [\old(x)=0, \result=0, x=0] [L6] EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L6] RET return id(x-1) + 1; [L11] EXPR id(input) VAL [id(input)=20, input=20] [L11] int result = id(input); [L12] COND TRUE result == 20 VAL [input=20, result=20] [L13] __VERIFIER_error() VAL [input=20, result=20] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 121.9s OverallTime, 21 OverallIterations, 21 TraceHistogramMax, 6.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 260 SDtfs, 431 SDslu, 3947 SDs, 0 SdLazy, 2345 SolverSat, 152 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 3518 GetRequests, 2095 SyntacticMatches, 397 SemanticMatches, 1026 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19561 ImplicationChecksByTransitivity, 18.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 1 AbstIntStrong, 0.8657407407407407 AbsIntWeakeningRatio, 0.5555555555555556 AbsIntAvgWeakeningVarsNumRemoved, 6.944444444444445 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 20 MinimizatonAttempts, 164 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 112.8s InterpolantComputationTime, 2901 NumberOfCodeBlocks, 2901 NumberOfCodeBlocksAsserted, 102 NumberOfCheckSat, 4080 ConstructedInterpolants, 0 QuantifiedInterpolants, 1004976 SizeOfPredicates, 216 NumberOfNonLiveVariables, 3222 ConjunctsInSsa, 450 ConjunctsInUnsatCore, 56 InterpolantComputations, 1 PerfectInterpolantSequences, 8991/22792 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...