./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i --full-output --rcfgbuilder.size.of.a.code.block SingleStatement --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UTaipan-linux --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 aeade23d65797ff650f62ff8e383f015764d9ed2 --rcfgbuilder.size.of.a.code.block SingleStatement .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.23-0210da8 [2018-10-22 09:40:21,545 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 09:40:21,547 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 09:40:21,562 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 09:40:21,566 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 09:40:21,570 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 09:40:21,571 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 09:40:21,573 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 09:40:21,575 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 09:40:21,576 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 09:40:21,577 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 09:40:21,577 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 09:40:21,578 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 09:40:21,579 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 09:40:21,580 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 09:40:21,581 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 09:40:21,582 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 09:40:21,584 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 09:40:21,586 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 09:40:21,587 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 09:40:21,589 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 09:40:21,590 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 09:40:21,592 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 09:40:21,593 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 09:40:21,595 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 09:40:21,596 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 09:40:21,600 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 09:40:21,602 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 09:40:21,604 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 09:40:21,607 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 09:40:21,608 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 09:40:21,608 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 09:40:21,610 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 09:40:21,611 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 09:40:21,613 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 09:40:21,614 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 09:40:21,616 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-22 09:40:21,648 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 09:40:21,648 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 09:40:21,649 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 09:40:21,649 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 09:40:21,652 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 09:40:21,652 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 09:40:21,652 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 09:40:21,652 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 09:40:21,653 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 09:40:21,653 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 09:40:21,653 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 09:40:21,654 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 09:40:21,654 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-22 09:40:21,654 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 09:40:21,654 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-22 09:40:21,654 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 09:40:21,655 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 09:40:21,656 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 09:40:21,656 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 09:40:21,656 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-22 09:40:21,657 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 09:40:21,657 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 09:40:21,657 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 09:40:21,658 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 09:40:21,658 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 09:40:21,658 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 09:40:21,658 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 09:40:21,658 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 09:40:21,659 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 09:40:21,659 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 09:40:21,659 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 09:40:21,659 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 09:40:21,659 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 09:40:21,660 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 09:40:21,661 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 -> /storage/repos/ultimate/releaseScripts/default/UTaipan-linux 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 -> aeade23d65797ff650f62ff8e383f015764d9ed2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement [2018-10-22 09:40:21,713 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 09:40:21,727 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 09:40:21,731 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 09:40:21,733 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 09:40:21,733 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 09:40:21,734 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i [2018-10-22 09:40:21,800 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6f797e43b/723732baf03f4e44bab7fd55ee66c05e/FLAG855990231 [2018-10-22 09:40:22,272 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 09:40:22,273 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i [2018-10-22 09:40:22,279 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6f797e43b/723732baf03f4e44bab7fd55ee66c05e/FLAG855990231 [2018-10-22 09:40:22,296 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6f797e43b/723732baf03f4e44bab7fd55ee66c05e [2018-10-22 09:40:22,300 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 09:40:22,302 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-22 09:40:22,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 09:40:22,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 09:40:22,307 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 09:40:22,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bec4742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22, skipping insertion in model container [2018-10-22 09:40:22,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 09:40:22,343 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 09:40:22,526 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 09:40:22,530 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 09:40:22,550 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 09:40:22,569 INFO L193 MainTranslator]: Completed translation [2018-10-22 09:40:22,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22 WrapperNode [2018-10-22 09:40:22,570 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 09:40:22,571 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 09:40:22,571 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 09:40:22,572 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 09:40:22,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,591 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,598 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 09:40:22,598 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 09:40:22,599 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 09:40:22,599 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 09:40:22,610 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,610 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,611 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,611 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,615 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,621 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,623 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... [2018-10-22 09:40:22,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 09:40:22,627 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 09:40:22,627 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 09:40:22,627 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 09:40:22,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/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 [2018-10-22 09:40:22,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 09:40:22,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 09:40:22,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 09:40:22,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 09:40:22,818 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 09:40:22,818 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 09:40:22,818 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 09:40:22,818 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 09:40:23,097 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 09:40:23,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:40:23 BoogieIcfgContainer [2018-10-22 09:40:23,099 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 09:40:23,100 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 09:40:23,108 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 09:40:23,112 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 09:40:23,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 09:40:22" (1/3) ... [2018-10-22 09:40:23,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24dd7dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:40:23, skipping insertion in model container [2018-10-22 09:40:23,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:40:22" (2/3) ... [2018-10-22 09:40:23,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24dd7dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:40:23, skipping insertion in model container [2018-10-22 09:40:23,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:40:23" (3/3) ... [2018-10-22 09:40:23,127 INFO L112 eAbstractionObserver]: Analyzing ICFG sum04_false-unreach-call_true-termination.i [2018-10-22 09:40:23,150 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 09:40:23,168 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 09:40:23,186 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 09:40:23,219 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 09:40:23,220 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 09:40:23,220 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 09:40:23,220 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 09:40:23,220 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 09:40:23,220 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 09:40:23,220 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 09:40:23,221 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 09:40:23,221 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 09:40:23,240 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-22 09:40:23,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-22 09:40:23,246 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:23,247 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:23,250 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:23,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:23,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1771309121, now seen corresponding path program 1 times [2018-10-22 09:40:23,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:23,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:23,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,315 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:23,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:23,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:23,384 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 09:40:23,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 09:40:23,384 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 09:40:23,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 09:40:23,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 09:40:23,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 09:40:23,407 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-22 09:40:23,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:23,431 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2018-10-22 09:40:23,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 09:40:23,433 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-22 09:40:23,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:23,449 INFO L225 Difference]: With dead ends: 36 [2018-10-22 09:40:23,450 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 09:40:23,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 09:40:23,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 09:40:23,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 09:40:23,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 09:40:23,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-22 09:40:23,488 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 12 [2018-10-22 09:40:23,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:23,489 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-22 09:40:23,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 09:40:23,489 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-22 09:40:23,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 09:40:23,490 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:23,490 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:23,490 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:23,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:23,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1440719901, now seen corresponding path program 1 times [2018-10-22 09:40:23,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:23,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:23,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,492 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:23,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:23,551 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 09:40:23,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 09:40:23,552 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 09:40:23,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 09:40:23,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 09:40:23,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 09:40:23,554 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-10-22 09:40:23,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:23,619 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2018-10-22 09:40:23,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 09:40:23,620 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-22 09:40:23,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:23,621 INFO L225 Difference]: With dead ends: 37 [2018-10-22 09:40:23,621 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 09:40:23,622 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 09:40:23,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 09:40:23,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2018-10-22 09:40:23,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 09:40:23,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-22 09:40:23,628 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 13 [2018-10-22 09:40:23,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:23,629 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-22 09:40:23,629 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 09:40:23,629 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-22 09:40:23,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 09:40:23,630 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:23,630 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:23,630 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:23,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:23,631 INFO L82 PathProgramCache]: Analyzing trace with hash 726037051, now seen corresponding path program 1 times [2018-10-22 09:40:23,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:23,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:23,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:23,633 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:23,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:23,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:23,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:23,728 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:40:23,729 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-22 09:40:23,732 INFO L202 CegarAbsIntRunner]: [0], [4], [5], [6], [10], [13], [15], [18], [19], [23], [24], [25], [31], [34], [36], [42], [43], [44], [46] [2018-10-22 09:40:23,780 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 09:40:23,780 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 09:40:24,079 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-22 09:40:24,081 INFO L272 AbstractInterpreter]: Visited 15 different actions 103 times. Merged at 7 different actions 77 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 09:40:24,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:24,126 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-22 09:40:24,193 INFO L232 lantSequenceWeakener]: Weakened 2 states. On average, predicates are now at 33.33% of their original sizes. [2018-10-22 09:40:24,193 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-22 09:40:24,420 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-22 09:40:24,421 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-22 09:40:24,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [5] total 11 [2018-10-22 09:40:24,421 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 09:40:24,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 09:40:24,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 09:40:24,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-10-22 09:40:24,423 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2018-10-22 09:40:25,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:25,330 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-22 09:40:25,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 09:40:25,330 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-22 09:40:25,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:25,331 INFO L225 Difference]: With dead ends: 39 [2018-10-22 09:40:25,331 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 09:40:25,332 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-22 09:40:25,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 09:40:25,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2018-10-22 09:40:25,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 09:40:25,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-22 09:40:25,339 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 20 [2018-10-22 09:40:25,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:25,340 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-22 09:40:25,340 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 09:40:25,340 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-22 09:40:25,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 09:40:25,341 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:25,341 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:25,342 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:25,342 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:25,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1071593571, now seen corresponding path program 1 times [2018-10-22 09:40:25,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:25,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:25,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:25,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:25,344 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:25,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:25,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:25,468 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:40:25,469 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2018-10-22 09:40:25,469 INFO L202 CegarAbsIntRunner]: [0], [4], [5], [6], [10], [13], [15], [18], [19], [21], [23], [24], [25], [31], [34], [36], [42], [43], [44], [46] [2018-10-22 09:40:25,471 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 09:40:25,472 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 09:40:25,806 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 09:40:25,806 INFO L272 AbstractInterpreter]: Visited 20 different actions 213 times. Merged at 9 different actions 140 times. Widened at 1 different actions 12 times. Found 16 fixpoints after 5 different actions. Largest state had 3 variables. [2018-10-22 09:40:25,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:25,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 09:40:25,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:25,823 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/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 [2018-10-22 09:40:25,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:25,833 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 09:40:25,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:25,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:25,886 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:25,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:26,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:26,047 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 09:40:26,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:26,075 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 09:40:26,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:26,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:26,109 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:26,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:40:26,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 7 [2018-10-22 09:40:26,150 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:40:26,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 09:40:26,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 09:40:26,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-22 09:40:26,154 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 5 states. [2018-10-22 09:40:26,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:26,343 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2018-10-22 09:40:26,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 09:40:26,344 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 26 [2018-10-22 09:40:26,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:26,345 INFO L225 Difference]: With dead ends: 51 [2018-10-22 09:40:26,345 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 09:40:26,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2018-10-22 09:40:26,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 09:40:26,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2018-10-22 09:40:26,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 09:40:26,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-22 09:40:26,353 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 26 [2018-10-22 09:40:26,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:26,353 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-22 09:40:26,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 09:40:26,354 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-22 09:40:26,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 09:40:26,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:26,355 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:26,355 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:26,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:26,356 INFO L82 PathProgramCache]: Analyzing trace with hash 667915, now seen corresponding path program 2 times [2018-10-22 09:40:26,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:26,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:26,357 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:40:26,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:26,358 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:26,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:26,476 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:26,479 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:40:26,479 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:40:26,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:40:26,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:26,480 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 09:40:26,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 09:40:26,490 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:40:26,523 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 09:40:26,523 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:26,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:26,533 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:26,834 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:26,868 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 09:40:26,897 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 09:40:26,897 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:40:26,923 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 09:40:26,924 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:26,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:26,941 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:26,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:27,049 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:27,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:40:27,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 7 [2018-10-22 09:40:27,052 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:40:27,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 09:40:27,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 09:40:27,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-22 09:40:27,060 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 7 states. [2018-10-22 09:40:27,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:27,176 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2018-10-22 09:40:27,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 09:40:27,177 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2018-10-22 09:40:27,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:27,178 INFO L225 Difference]: With dead ends: 57 [2018-10-22 09:40:27,179 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 09:40:27,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 122 SyntacticMatches, 10 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2018-10-22 09:40:27,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 09:40:27,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-22 09:40:27,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 09:40:27,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2018-10-22 09:40:27,192 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 33 [2018-10-22 09:40:27,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:27,193 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2018-10-22 09:40:27,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 09:40:27,193 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2018-10-22 09:40:27,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 09:40:27,196 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:27,196 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:27,197 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:27,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:27,197 INFO L82 PathProgramCache]: Analyzing trace with hash -337794205, now seen corresponding path program 3 times [2018-10-22 09:40:27,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:27,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:27,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:40:27,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:27,199 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:27,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:27,307 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-10-22 09:40:27,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:27,307 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:40:27,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:40:27,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:40:27,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:27,308 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/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 [2018-10-22 09:40:27,317 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 09:40:27,317 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 09:40:27,355 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 09:40:27,356 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:27,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:27,374 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-10-22 09:40:27,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:27,484 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-10-22 09:40:27,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:27,505 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 09:40:27,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 09:40:27,522 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 09:40:27,551 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 09:40:27,551 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:27,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:27,582 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-10-22 09:40:27,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:27,598 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-10-22 09:40:27,600 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:40:27,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 09:40:27,600 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:40:27,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 09:40:27,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 09:40:27,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-10-22 09:40:27,602 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 7 states. [2018-10-22 09:40:27,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:27,741 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2018-10-22 09:40:27,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 09:40:27,742 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2018-10-22 09:40:27,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:27,744 INFO L225 Difference]: With dead ends: 62 [2018-10-22 09:40:27,745 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 09:40:27,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2018-10-22 09:40:27,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 09:40:27,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 47. [2018-10-22 09:40:27,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 09:40:27,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-10-22 09:40:27,753 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 40 [2018-10-22 09:40:27,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:27,753 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-10-22 09:40:27,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 09:40:27,753 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-10-22 09:40:27,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 09:40:27,755 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:27,755 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:27,755 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:27,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:27,756 INFO L82 PathProgramCache]: Analyzing trace with hash 2053174155, now seen corresponding path program 4 times [2018-10-22 09:40:27,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:27,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:27,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:40:27,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:27,757 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:27,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:40:28,081 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:28,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:28,082 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:40:28,082 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:40:28,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:40:28,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:28,083 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/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 [2018-10-22 09:40:28,093 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 09:40:28,093 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 09:40:28,122 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 09:40:28,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:28,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:28,237 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 14 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:28,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:28,382 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 14 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:28,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:40:28,404 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 09:40:28,420 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 09:40:28,420 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 09:40:28,443 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 09:40:28,443 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:40:28,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:40:28,468 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 14 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:28,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:40:28,691 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 14 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:40:28,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:40:28,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 17 [2018-10-22 09:40:28,693 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:40:28,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 09:40:28,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 09:40:28,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2018-10-22 09:40:28,694 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 17 states. [2018-10-22 09:40:29,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:40:29,167 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2018-10-22 09:40:29,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 09:40:29,169 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 46 [2018-10-22 09:40:29,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:40:29,173 INFO L225 Difference]: With dead ends: 70 [2018-10-22 09:40:29,173 INFO L226 Difference]: Without dead ends: 65 [2018-10-22 09:40:29,174 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 158 SyntacticMatches, 22 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=318, Invalid=612, Unknown=0, NotChecked=0, Total=930 [2018-10-22 09:40:29,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-22 09:40:29,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-10-22 09:40:29,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-22 09:40:29,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2018-10-22 09:40:29,182 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 46 [2018-10-22 09:40:29,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:40:29,182 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2018-10-22 09:40:29,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 09:40:29,183 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2018-10-22 09:40:29,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-22 09:40:29,184 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:40:29,185 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:40:29,185 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:40:29,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:40:29,185 INFO L82 PathProgramCache]: Analyzing trace with hash 24664067, now seen corresponding path program 5 times [2018-10-22 09:40:29,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:40:29,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:29,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:40:29,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:40:29,186 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:40:29,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 09:40:29,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 09:40:29,229 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-22 09:40:29,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 09:40:29 BoogieIcfgContainer [2018-10-22 09:40:29,259 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 09:40:29,259 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-22 09:40:29,259 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-22 09:40:29,259 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-22 09:40:29,260 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:40:23" (3/4) ... [2018-10-22 09:40:29,262 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-22 09:40:29,317 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-22 09:40:29,317 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-22 09:40:29,319 INFO L168 Benchmark]: Toolchain (without parser) took 7017.71 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 220.2 MB). Free memory was 943.8 MB in the beginning and 1.2 GB in the end (delta: -211.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 11.5 GB. [2018-10-22 09:40:29,321 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:40:29,321 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.69 ms. Allocated memory is still 1.0 GB. Free memory was 943.8 MB in the beginning and 931.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. [2018-10-22 09:40:29,322 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.98 ms. Allocated memory is still 1.0 GB. Free memory is still 931.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:40:29,322 INFO L168 Benchmark]: Boogie Preprocessor took 28.29 ms. Allocated memory is still 1.0 GB. Free memory is still 931.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:40:29,323 INFO L168 Benchmark]: RCFGBuilder took 471.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 154.1 MB). Free memory was 931.7 MB in the beginning and 1.1 GB in the end (delta: -205.5 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. [2018-10-22 09:40:29,324 INFO L168 Benchmark]: TraceAbstraction took 6158.29 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 66.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -18.4 MB). Peak memory consumption was 47.7 MB. Max. memory is 11.5 GB. [2018-10-22 09:40:29,325 INFO L168 Benchmark]: Witness Printer took 58.46 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:40:29,329 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 267.69 ms. Allocated memory is still 1.0 GB. Free memory was 943.8 MB in the beginning and 931.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 26.98 ms. Allocated memory is still 1.0 GB. Free memory is still 931.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 28.29 ms. Allocated memory is still 1.0 GB. Free memory is still 931.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 471.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 154.1 MB). Free memory was 931.7 MB in the beginning and 1.1 GB in the end (delta: -205.5 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6158.29 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 66.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -18.4 MB). Peak memory consumption was 47.7 MB. Max. memory is 11.5 GB. * Witness Printer took 58.46 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, sn=0; VAL [sn=0] [L13] i=1 VAL [i=1, sn=0] [L13] COND TRUE i<=8 VAL [i=1, sn=0] [L14] COND TRUE i<4 VAL [i=1, sn=0] [L15] sn = sn + (2) VAL [i=1, sn=2] [L13] i++ VAL [i=2, sn=2] [L13] COND TRUE i<=8 VAL [i=2, sn=2] [L14] COND TRUE i<4 VAL [i=2, sn=2] [L15] sn = sn + (2) VAL [i=2, sn=4] [L13] i++ VAL [i=3, sn=4] [L13] COND TRUE i<=8 VAL [i=3, sn=4] [L14] COND TRUE i<4 VAL [i=3, sn=4] [L15] sn = sn + (2) VAL [i=3, sn=6] [L13] i++ VAL [i=4, sn=6] [L13] COND TRUE i<=8 VAL [i=4, sn=6] [L14] COND FALSE !(i<4) VAL [i=4, sn=6] [L13] i++ VAL [i=5, sn=6] [L13] COND TRUE i<=8 VAL [i=5, sn=6] [L14] COND FALSE !(i<4) VAL [i=5, sn=6] [L13] i++ VAL [i=6, sn=6] [L13] COND TRUE i<=8 VAL [i=6, sn=6] [L14] COND FALSE !(i<4) VAL [i=6, sn=6] [L13] i++ VAL [i=7, sn=6] [L13] COND TRUE i<=8 VAL [i=7, sn=6] [L14] COND FALSE !(i<4) VAL [i=7, sn=6] [L13] i++ VAL [i=8, sn=6] [L13] COND TRUE i<=8 VAL [i=8, sn=6] [L14] COND FALSE !(i<4) VAL [i=8, sn=6] [L13] i++ VAL [i=9, sn=6] [L13] COND FALSE !(i<=8) VAL [i=9, sn=6] [L17] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. UNSAFE Result, 6.0s OverallTime, 8 OverallIterations, 9 TraceHistogramMax, 1.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 121 SDtfs, 94 SDslu, 276 SDs, 0 SdLazy, 198 SolverSat, 39 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 658 GetRequests, 550 SyntacticMatches, 36 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 2.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=65occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.7s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.9122807017543859 AbsIntWeakeningRatio, 0.42105263157894735 AbsIntAvgWeakeningVarsNumRemoved, 0.8421052631578947 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 23 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 544 NumberOfCodeBlocks, 514 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 747 ConstructedInterpolants, 0 QuantifiedInterpolants, 54281 SizeOfPredicates, 50 NumberOfNonLiveVariables, 420 ConjunctsInSsa, 56 ConjunctsInUnsatCore, 23 InterpolantComputations, 2 PerfectInterpolantSequences, 361/777 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...