./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i -s /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 76260ed82768318ee6f3ac3cb9cfff5a60080963 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 10:42:06,590 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 10:42:06,591 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 10:42:06,598 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 10:42:06,598 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 10:42:06,598 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 10:42:06,599 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 10:42:06,600 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 10:42:06,601 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 10:42:06,602 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 10:42:06,602 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 10:42:06,603 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 10:42:06,604 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 10:42:06,604 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 10:42:06,605 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 10:42:06,606 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 10:42:06,606 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 10:42:06,608 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 10:42:06,609 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 10:42:06,610 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 10:42:06,611 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 10:42:06,612 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 10:42:06,613 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 10:42:06,613 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 10:42:06,614 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 10:42:06,614 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 10:42:06,615 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 10:42:06,616 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 10:42:06,616 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 10:42:06,617 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 10:42:06,617 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 10:42:06,618 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 10:42:06,618 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 10:42:06,618 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 10:42:06,619 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 10:42:06,619 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 10:42:06,620 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 10:42:06,628 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 10:42:06,629 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 10:42:06,629 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 10:42:06,629 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 10:42:06,629 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 10:42:06,630 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 10:42:06,630 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 10:42:06,631 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 10:42:06,631 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 10:42:06,632 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 10:42:06,633 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 10:42:06,633 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 10:42:06,633 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 10:42:06,634 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 10:42:06,634 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 10:42:06,634 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_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 -> 76260ed82768318ee6f3ac3cb9cfff5a60080963 [2018-11-18 10:42:06,662 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 10:42:06,669 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 10:42:06,671 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 10:42:06,672 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 10:42:06,672 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 10:42:06,673 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-11-18 10:42:06,707 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/data/83051b196/ed56f77874ec4f1a9c42b163eb9767e9/FLAG232c3f820 [2018-11-18 10:42:07,101 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 10:42:07,102 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-11-18 10:42:07,106 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/data/83051b196/ed56f77874ec4f1a9c42b163eb9767e9/FLAG232c3f820 [2018-11-18 10:42:07,116 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/data/83051b196/ed56f77874ec4f1a9c42b163eb9767e9 [2018-11-18 10:42:07,119 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 10:42:07,119 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 10:42:07,120 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 10:42:07,120 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 10:42:07,122 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 10:42:07,123 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,125 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cf76dfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07, skipping insertion in model container [2018-11-18 10:42:07,125 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,132 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 10:42:07,148 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 10:42:07,247 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 10:42:07,249 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 10:42:07,258 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 10:42:07,265 INFO L195 MainTranslator]: Completed translation [2018-11-18 10:42:07,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07 WrapperNode [2018-11-18 10:42:07,266 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 10:42:07,266 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 10:42:07,266 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 10:42:07,266 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 10:42:07,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,277 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 10:42:07,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 10:42:07,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 10:42:07,283 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 10:42:07,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,291 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,291 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,294 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,298 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... [2018-11-18 10:42:07,298 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 10:42:07,299 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 10:42:07,299 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 10:42:07,299 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 10:42:07,299 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:07,380 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 10:42:07,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 10:42:07,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 10:42:07,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 10:42:07,381 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 10:42:07,381 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 10:42:07,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 10:42:07,381 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 10:42:07,475 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 10:42:07,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 10:42:07 BoogieIcfgContainer [2018-11-18 10:42:07,475 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 10:42:07,476 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 10:42:07,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 10:42:07,478 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 10:42:07,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 10:42:07" (1/3) ... [2018-11-18 10:42:07,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51b77dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 10:42:07, skipping insertion in model container [2018-11-18 10:42:07,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 10:42:07" (2/3) ... [2018-11-18 10:42:07,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51b77dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 10:42:07, skipping insertion in model container [2018-11-18 10:42:07,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 10:42:07" (3/3) ... [2018-11-18 10:42:07,480 INFO L112 eAbstractionObserver]: Analyzing ICFG gr2006_true-unreach-call_true-termination.c.i [2018-11-18 10:42:07,486 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 10:42:07,491 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 10:42:07,505 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 10:42:07,531 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 10:42:07,531 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 10:42:07,531 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 10:42:07,532 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 10:42:07,532 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 10:42:07,532 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 10:42:07,532 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 10:42:07,532 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 10:42:07,547 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-18 10:42:07,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-18 10:42:07,552 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:07,553 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:07,555 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:07,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:07,560 INFO L82 PathProgramCache]: Analyzing trace with hash -859010367, now seen corresponding path program 1 times [2018-11-18 10:42:07,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:07,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:07,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,604 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:07,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:07,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 10:42:07,649 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 10:42:07,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 10:42:07,650 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 10:42:07,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 10:42:07,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 10:42:07,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 10:42:07,665 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-18 10:42:07,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:07,682 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2018-11-18 10:42:07,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 10:42:07,684 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-18 10:42:07,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:07,689 INFO L225 Difference]: With dead ends: 33 [2018-11-18 10:42:07,689 INFO L226 Difference]: Without dead ends: 14 [2018-11-18 10:42:07,691 INFO L604 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 [2018-11-18 10:42:07,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-18 10:42:07,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-18 10:42:07,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-18 10:42:07,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-18 10:42:07,717 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-18 10:42:07,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:07,717 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-18 10:42:07,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 10:42:07,718 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-18 10:42:07,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 10:42:07,718 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:07,718 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:07,718 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:07,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:07,719 INFO L82 PathProgramCache]: Analyzing trace with hash 220608140, now seen corresponding path program 1 times [2018-11-18 10:42:07,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:07,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,720 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:07,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:07,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:07,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 10:42:07,766 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 10:42:07,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 10:42:07,766 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 10:42:07,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 10:42:07,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 10:42:07,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-18 10:42:07,768 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 4 states. [2018-11-18 10:42:07,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:07,790 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-11-18 10:42:07,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 10:42:07,790 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-11-18 10:42:07,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:07,791 INFO L225 Difference]: With dead ends: 24 [2018-11-18 10:42:07,791 INFO L226 Difference]: Without dead ends: 19 [2018-11-18 10:42:07,791 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-18 10:42:07,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-18 10:42:07,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-18 10:42:07,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-18 10:42:07,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-11-18 10:42:07,795 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2018-11-18 10:42:07,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:07,795 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-11-18 10:42:07,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 10:42:07,795 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-11-18 10:42:07,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 10:42:07,796 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:07,796 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:07,796 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:07,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:07,796 INFO L82 PathProgramCache]: Analyzing trace with hash 277866442, now seen corresponding path program 1 times [2018-11-18 10:42:07,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:07,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:07,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,797 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:07,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:07,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 10:42:07,820 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 10:42:07,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 10:42:07,820 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 10:42:07,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 10:42:07,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 10:42:07,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 10:42:07,821 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2018-11-18 10:42:07,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:07,842 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2018-11-18 10:42:07,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 10:42:07,843 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-11-18 10:42:07,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:07,843 INFO L225 Difference]: With dead ends: 37 [2018-11-18 10:42:07,843 INFO L226 Difference]: Without dead ends: 23 [2018-11-18 10:42:07,844 INFO L604 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 [2018-11-18 10:42:07,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-11-18 10:42:07,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-11-18 10:42:07,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-18 10:42:07,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-11-18 10:42:07,847 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2018-11-18 10:42:07,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:07,847 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-11-18 10:42:07,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 10:42:07,848 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-11-18 10:42:07,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-18 10:42:07,848 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:07,848 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:07,848 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:07,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:07,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1383636324, now seen corresponding path program 1 times [2018-11-18 10:42:07,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:07,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:07,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:07,850 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:07,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:07,886 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 10:42:07,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:07,886 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:07,886 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-11-18 10:42:07,888 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [14], [17], [19], [23], [25], [32], [35], [37], [43], [44], [45], [47] [2018-11-18 10:42:07,913 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 10:42:07,914 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 10:42:08,008 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 10:42:08,008 INFO L272 AbstractInterpreter]: Visited 15 different actions 37 times. Merged at 5 different actions 13 times. Never widened. Performed 86 root evaluator evaluations with a maximum evaluation depth of 4. Performed 86 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 3 fixpoints after 2 different actions. Largest state had 5 variables. [2018-11-18 10:42:08,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 10:42:08,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:08,020 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:08,020 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:08,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:08,045 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 10:42:08,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:08,067 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 10:42:08,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:08,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-18 10:42:08,089 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:08,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 10:42:08,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 10:42:08,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-18 10:42:08,090 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2018-11-18 10:42:08,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:08,112 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2018-11-18 10:42:08,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 10:42:08,113 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2018-11-18 10:42:08,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:08,113 INFO L225 Difference]: With dead ends: 41 [2018-11-18 10:42:08,113 INFO L226 Difference]: Without dead ends: 27 [2018-11-18 10:42:08,114 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-18 10:42:08,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-18 10:42:08,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-11-18 10:42:08,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-18 10:42:08,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-11-18 10:42:08,116 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2018-11-18 10:42:08,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:08,117 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-11-18 10:42:08,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 10:42:08,117 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-11-18 10:42:08,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-18 10:42:08,119 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:08,119 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:08,120 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:08,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1112171374, now seen corresponding path program 2 times [2018-11-18 10:42:08,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:08,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:08,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,121 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:08,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,173 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 10:42:08,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,173 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:08,173 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:08,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:08,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:08,184 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:08,184 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:08,196 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 10:42:08,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:08,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:08,226 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-18 10:42:08,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:08,270 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-18 10:42:08,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:08,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-18 10:42:08,286 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:08,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 10:42:08,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 10:42:08,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-11-18 10:42:08,287 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2018-11-18 10:42:08,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:08,358 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-11-18 10:42:08,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 10:42:08,358 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-11-18 10:42:08,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:08,359 INFO L225 Difference]: With dead ends: 54 [2018-11-18 10:42:08,359 INFO L226 Difference]: Without dead ends: 40 [2018-11-18 10:42:08,360 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2018-11-18 10:42:08,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-18 10:42:08,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2018-11-18 10:42:08,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-18 10:42:08,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2018-11-18 10:42:08,364 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 25 [2018-11-18 10:42:08,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:08,364 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2018-11-18 10:42:08,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 10:42:08,364 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2018-11-18 10:42:08,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-18 10:42:08,365 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:08,365 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:08,365 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:08,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,366 INFO L82 PathProgramCache]: Analyzing trace with hash 951638316, now seen corresponding path program 3 times [2018-11-18 10:42:08,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:08,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,366 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:08,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,367 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:08,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,410 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:08,411 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:08,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:08,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,411 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/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 [2018-11-18 10:42:08,419 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:08,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:08,427 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:08,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:08,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:08,432 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:08,474 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:08,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-18 10:42:08,490 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:08,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 10:42:08,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 10:42:08,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-18 10:42:08,491 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 6 states. [2018-11-18 10:42:08,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:08,506 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2018-11-18 10:42:08,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 10:42:08,507 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2018-11-18 10:42:08,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:08,507 INFO L225 Difference]: With dead ends: 57 [2018-11-18 10:42:08,507 INFO L226 Difference]: Without dead ends: 39 [2018-11-18 10:42:08,508 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-18 10:42:08,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-18 10:42:08,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-11-18 10:42:08,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-18 10:42:08,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2018-11-18 10:42:08,512 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 33 [2018-11-18 10:42:08,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:08,512 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2018-11-18 10:42:08,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 10:42:08,512 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2018-11-18 10:42:08,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-18 10:42:08,513 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:08,513 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:08,513 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:08,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,513 INFO L82 PathProgramCache]: Analyzing trace with hash 150635354, now seen corresponding path program 4 times [2018-11-18 10:42:08,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:08,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:08,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,514 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:08,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,555 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,556 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:08,556 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:08,556 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:08,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,556 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:08,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:08,563 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:08,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:08,581 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:08,641 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:08,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-18 10:42:08,656 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:08,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 10:42:08,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 10:42:08,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-18 10:42:08,657 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 7 states. [2018-11-18 10:42:08,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:08,693 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-11-18 10:42:08,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 10:42:08,693 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2018-11-18 10:42:08,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:08,694 INFO L225 Difference]: With dead ends: 61 [2018-11-18 10:42:08,694 INFO L226 Difference]: Without dead ends: 43 [2018-11-18 10:42:08,695 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-18 10:42:08,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-18 10:42:08,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-11-18 10:42:08,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-18 10:42:08,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-11-18 10:42:08,699 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2018-11-18 10:42:08,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:08,700 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-11-18 10:42:08,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 10:42:08,700 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-11-18 10:42:08,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-18 10:42:08,701 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:08,701 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:08,701 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:08,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,701 INFO L82 PathProgramCache]: Analyzing trace with hash 786392712, now seen corresponding path program 5 times [2018-11-18 10:42:08,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:08,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,702 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:08,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,702 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:08,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:08,751 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 51 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 10:42:08,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,751 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:08,752 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:08,752 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:08,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:08,752 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:08,759 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:08,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:08,770 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-18 10:42:08,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:08,772 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:08,796 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 79 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-18 10:42:08,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:08,845 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 79 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-18 10:42:08,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:08,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2018-11-18 10:42:08,860 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:08,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 10:42:08,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 10:42:08,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-11-18 10:42:08,861 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 12 states. [2018-11-18 10:42:08,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:08,954 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2018-11-18 10:42:08,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 10:42:08,956 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2018-11-18 10:42:08,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:08,957 INFO L225 Difference]: With dead ends: 78 [2018-11-18 10:42:08,957 INFO L226 Difference]: Without dead ends: 60 [2018-11-18 10:42:08,958 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=134, Invalid=286, Unknown=0, NotChecked=0, Total=420 [2018-11-18 10:42:08,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-18 10:42:08,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 50. [2018-11-18 10:42:08,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-18 10:42:08,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-11-18 10:42:08,963 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2018-11-18 10:42:08,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:08,963 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-11-18 10:42:08,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 10:42:08,963 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-11-18 10:42:08,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-18 10:42:08,964 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:08,964 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:08,964 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:08,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:08,965 INFO L82 PathProgramCache]: Analyzing trace with hash 568630306, now seen corresponding path program 6 times [2018-11-18 10:42:08,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:08,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:08,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:08,966 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:08,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:09,021 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,021 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:09,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:09,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:09,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,022 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:09,029 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:09,029 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:09,040 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:09,040 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:09,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:09,048 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:09,126 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:09,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-18 10:42:09,140 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:09,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 10:42:09,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 10:42:09,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-11-18 10:42:09,141 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 9 states. [2018-11-18 10:42:09,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:09,158 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2018-11-18 10:42:09,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 10:42:09,158 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 49 [2018-11-18 10:42:09,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:09,159 INFO L225 Difference]: With dead ends: 77 [2018-11-18 10:42:09,159 INFO L226 Difference]: Without dead ends: 55 [2018-11-18 10:42:09,159 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-11-18 10:42:09,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-18 10:42:09,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-11-18 10:42:09,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-18 10:42:09,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-11-18 10:42:09,163 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 49 [2018-11-18 10:42:09,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:09,163 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-11-18 10:42:09,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 10:42:09,163 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-11-18 10:42:09,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-18 10:42:09,164 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:09,164 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:09,164 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:09,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:09,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1676137904, now seen corresponding path program 7 times [2018-11-18 10:42:09,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:09,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:09,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,166 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:09,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:09,244 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,244 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:09,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:09,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:09,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,245 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:09,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:09,256 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:09,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:09,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:09,275 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:09,366 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:09,381 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-18 10:42:09,381 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:09,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 10:42:09,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 10:42:09,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-18 10:42:09,382 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 10 states. [2018-11-18 10:42:09,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:09,399 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2018-11-18 10:42:09,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 10:42:09,399 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2018-11-18 10:42:09,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:09,400 INFO L225 Difference]: With dead ends: 81 [2018-11-18 10:42:09,400 INFO L226 Difference]: Without dead ends: 59 [2018-11-18 10:42:09,400 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-18 10:42:09,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-11-18 10:42:09,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2018-11-18 10:42:09,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-11-18 10:42:09,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2018-11-18 10:42:09,404 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 53 [2018-11-18 10:42:09,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:09,404 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2018-11-18 10:42:09,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 10:42:09,404 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2018-11-18 10:42:09,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-11-18 10:42:09,405 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:09,405 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:09,405 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:09,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:09,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1738739330, now seen corresponding path program 8 times [2018-11-18 10:42:09,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:09,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,406 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:09,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,406 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:09,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:09,457 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 113 proven. 136 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 10:42:09,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,457 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:09,457 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:09,457 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:09,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,457 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:09,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:09,463 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:09,477 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-18 10:42:09,477 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:09,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:09,510 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 185 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-18 10:42:09,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:09,559 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 185 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-18 10:42:09,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:09,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 16 [2018-11-18 10:42:09,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:09,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 10:42:09,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 10:42:09,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2018-11-18 10:42:09,575 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 16 states. [2018-11-18 10:42:09,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:09,659 INFO L93 Difference]: Finished difference Result 102 states and 116 transitions. [2018-11-18 10:42:09,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-18 10:42:09,660 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 57 [2018-11-18 10:42:09,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:09,661 INFO L225 Difference]: With dead ends: 102 [2018-11-18 10:42:09,661 INFO L226 Difference]: Without dead ends: 80 [2018-11-18 10:42:09,661 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 102 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=247, Invalid=565, Unknown=0, NotChecked=0, Total=812 [2018-11-18 10:42:09,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-11-18 10:42:09,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2018-11-18 10:42:09,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-18 10:42:09,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-11-18 10:42:09,665 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 57 [2018-11-18 10:42:09,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:09,665 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-11-18 10:42:09,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 10:42:09,665 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-11-18 10:42:09,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-18 10:42:09,666 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:09,666 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:09,666 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:09,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:09,666 INFO L82 PathProgramCache]: Analyzing trace with hash 626237464, now seen corresponding path program 9 times [2018-11-18 10:42:09,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:09,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:09,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,669 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:09,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:09,736 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:09,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:09,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:09,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:09,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:09,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:09,743 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:09,743 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:09,759 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:09,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:09,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:09,769 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:09,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:09,925 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:09,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:09,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-18 10:42:09,950 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:09,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 10:42:09,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 10:42:09,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-11-18 10:42:09,951 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 12 states. [2018-11-18 10:42:09,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:09,980 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2018-11-18 10:42:09,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 10:42:09,981 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 65 [2018-11-18 10:42:09,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:09,981 INFO L225 Difference]: With dead ends: 97 [2018-11-18 10:42:09,982 INFO L226 Difference]: Without dead ends: 71 [2018-11-18 10:42:09,982 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-11-18 10:42:09,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-11-18 10:42:09,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-11-18 10:42:09,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-18 10:42:09,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2018-11-18 10:42:09,988 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 65 [2018-11-18 10:42:09,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:09,988 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2018-11-18 10:42:09,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 10:42:09,988 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2018-11-18 10:42:09,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-18 10:42:09,989 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:09,989 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:09,989 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:09,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:09,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1859055034, now seen corresponding path program 10 times [2018-11-18 10:42:09,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:09,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:09,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:09,991 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:09,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:10,066 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:10,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,066 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:10,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:10,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:10,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,067 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:10,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:10,074 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:10,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:10,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:10,094 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:10,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:10,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:10,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-18 10:42:10,294 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:10,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 10:42:10,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 10:42:10,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-18 10:42:10,295 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand 13 states. [2018-11-18 10:42:10,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:10,325 INFO L93 Difference]: Finished difference Result 101 states and 112 transitions. [2018-11-18 10:42:10,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 10:42:10,325 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 69 [2018-11-18 10:42:10,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:10,325 INFO L225 Difference]: With dead ends: 101 [2018-11-18 10:42:10,325 INFO L226 Difference]: Without dead ends: 75 [2018-11-18 10:42:10,326 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-18 10:42:10,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-18 10:42:10,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-11-18 10:42:10,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-11-18 10:42:10,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2018-11-18 10:42:10,331 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 69 [2018-11-18 10:42:10,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:10,331 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2018-11-18 10:42:10,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 10:42:10,331 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2018-11-18 10:42:10,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-18 10:42:10,332 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:10,332 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:10,332 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:10,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:10,333 INFO L82 PathProgramCache]: Analyzing trace with hash 260947316, now seen corresponding path program 11 times [2018-11-18 10:42:10,333 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:10,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:10,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:10,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:10,334 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:10,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:10,409 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 199 proven. 253 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 10:42:10,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,409 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:10,409 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:10,409 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:10,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:10,416 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:10,416 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:10,430 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-18 10:42:10,430 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:10,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:10,479 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 331 proven. 73 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-11-18 10:42:10,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:10,584 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 331 proven. 73 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-11-18 10:42:10,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:10,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8, 8] total 20 [2018-11-18 10:42:10,599 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:10,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 10:42:10,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 10:42:10,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-18 10:42:10,600 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand 20 states. [2018-11-18 10:42:10,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:10,751 INFO L93 Difference]: Finished difference Result 126 states and 143 transitions. [2018-11-18 10:42:10,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-18 10:42:10,752 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 73 [2018-11-18 10:42:10,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:10,752 INFO L225 Difference]: With dead ends: 126 [2018-11-18 10:42:10,752 INFO L226 Difference]: Without dead ends: 100 [2018-11-18 10:42:10,753 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 131 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-11-18 10:42:10,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-11-18 10:42:10,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2018-11-18 10:42:10,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-11-18 10:42:10,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2018-11-18 10:42:10,758 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 73 [2018-11-18 10:42:10,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:10,758 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2018-11-18 10:42:10,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 10:42:10,758 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2018-11-18 10:42:10,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-18 10:42:10,759 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:10,759 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:10,759 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:10,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:10,759 INFO L82 PathProgramCache]: Analyzing trace with hash 749036814, now seen corresponding path program 12 times [2018-11-18 10:42:10,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:10,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:10,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:10,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:10,760 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:10,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:10,857 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:10,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:10,857 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:10,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:10,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:10,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:10,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:10,868 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:10,879 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:10,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:10,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:10,887 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:10,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:11,028 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:11,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:11,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-18 10:42:11,043 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:11,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 10:42:11,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 10:42:11,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-11-18 10:42:11,044 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand 15 states. [2018-11-18 10:42:11,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:11,066 INFO L93 Difference]: Finished difference Result 117 states and 130 transitions. [2018-11-18 10:42:11,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 10:42:11,067 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-11-18 10:42:11,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:11,067 INFO L225 Difference]: With dead ends: 117 [2018-11-18 10:42:11,067 INFO L226 Difference]: Without dead ends: 87 [2018-11-18 10:42:11,068 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-11-18 10:42:11,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-18 10:42:11,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-11-18 10:42:11,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-11-18 10:42:11,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2018-11-18 10:42:11,071 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 81 [2018-11-18 10:42:11,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:11,071 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2018-11-18 10:42:11,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 10:42:11,071 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2018-11-18 10:42:11,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-18 10:42:11,072 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:11,072 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:11,073 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:11,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:11,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1642380092, now seen corresponding path program 13 times [2018-11-18 10:42:11,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:11,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:11,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,074 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:11,162 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:11,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:11,162 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:11,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:11,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:11,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:11,163 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:11,169 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:11,169 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:11,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:11,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:11,191 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:11,191 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:11,374 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:11,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:11,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-18 10:42:11,390 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:11,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 10:42:11,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 10:42:11,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-18 10:42:11,391 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand 16 states. [2018-11-18 10:42:11,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:11,416 INFO L93 Difference]: Finished difference Result 121 states and 134 transitions. [2018-11-18 10:42:11,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 10:42:11,419 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 85 [2018-11-18 10:42:11,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:11,420 INFO L225 Difference]: With dead ends: 121 [2018-11-18 10:42:11,420 INFO L226 Difference]: Without dead ends: 91 [2018-11-18 10:42:11,421 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-18 10:42:11,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-11-18 10:42:11,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-11-18 10:42:11,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-18 10:42:11,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-11-18 10:42:11,426 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 85 [2018-11-18 10:42:11,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:11,426 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-11-18 10:42:11,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 10:42:11,426 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-11-18 10:42:11,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-18 10:42:11,427 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:11,427 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:11,427 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:11,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:11,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1643034006, now seen corresponding path program 14 times [2018-11-18 10:42:11,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:11,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:11,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:11,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:11,541 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 309 proven. 406 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 10:42:11,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:11,542 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:11,542 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:11,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:11,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:11,542 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:11,548 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:11,549 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:11,566 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-18 10:42:11,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:11,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:11,653 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 517 proven. 111 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-11-18 10:42:11,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:11,747 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 517 proven. 111 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-11-18 10:42:11,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:11,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 24 [2018-11-18 10:42:11,762 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:11,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-18 10:42:11,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-18 10:42:11,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2018-11-18 10:42:11,763 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 24 states. [2018-11-18 10:42:11,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:11,949 INFO L93 Difference]: Finished difference Result 150 states and 170 transitions. [2018-11-18 10:42:11,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-18 10:42:11,949 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 89 [2018-11-18 10:42:11,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:11,950 INFO L225 Difference]: With dead ends: 150 [2018-11-18 10:42:11,950 INFO L226 Difference]: Without dead ends: 120 [2018-11-18 10:42:11,951 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 160 SyntacticMatches, 12 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=575, Invalid=1405, Unknown=0, NotChecked=0, Total=1980 [2018-11-18 10:42:11,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-18 10:42:11,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 98. [2018-11-18 10:42:11,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-11-18 10:42:11,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2018-11-18 10:42:11,956 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 89 [2018-11-18 10:42:11,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:11,957 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2018-11-18 10:42:11,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-18 10:42:11,957 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2018-11-18 10:42:11,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-18 10:42:11,958 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:11,958 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:11,958 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:11,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:11,958 INFO L82 PathProgramCache]: Analyzing trace with hash -172397820, now seen corresponding path program 15 times [2018-11-18 10:42:11,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:11,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:11,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:11,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:11,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:12,069 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:12,069 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:12,070 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:12,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:12,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:12,070 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:12,076 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:12,076 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:12,095 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:12,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:12,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:12,108 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:12,324 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:12,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-18 10:42:12,339 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:12,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 10:42:12,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 10:42:12,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 10:42:12,340 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand 18 states. [2018-11-18 10:42:12,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:12,376 INFO L93 Difference]: Finished difference Result 137 states and 152 transitions. [2018-11-18 10:42:12,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 10:42:12,377 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 97 [2018-11-18 10:42:12,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:12,377 INFO L225 Difference]: With dead ends: 137 [2018-11-18 10:42:12,378 INFO L226 Difference]: Without dead ends: 103 [2018-11-18 10:42:12,378 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 10:42:12,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-11-18 10:42:12,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-11-18 10:42:12,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-18 10:42:12,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2018-11-18 10:42:12,383 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 97 [2018-11-18 10:42:12,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:12,383 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2018-11-18 10:42:12,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 10:42:12,383 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2018-11-18 10:42:12,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-11-18 10:42:12,384 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:12,384 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:12,384 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:12,384 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:12,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1544725810, now seen corresponding path program 16 times [2018-11-18 10:42:12,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:12,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:12,385 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:12,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:12,385 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:12,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:12,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:12,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:12,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:12,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:12,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:12,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:12,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:12,513 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:12,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:12,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:12,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:12,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:12,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-18 10:42:12,823 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:12,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 10:42:12,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 10:42:12,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 10:42:12,824 INFO L87 Difference]: Start difference. First operand 102 states and 109 transitions. Second operand 19 states. [2018-11-18 10:42:12,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:12,863 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2018-11-18 10:42:12,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 10:42:12,864 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2018-11-18 10:42:12,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:12,865 INFO L225 Difference]: With dead ends: 141 [2018-11-18 10:42:12,865 INFO L226 Difference]: Without dead ends: 107 [2018-11-18 10:42:12,866 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 10:42:12,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-11-18 10:42:12,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2018-11-18 10:42:12,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-18 10:42:12,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 113 transitions. [2018-11-18 10:42:12,870 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 113 transitions. Word has length 101 [2018-11-18 10:42:12,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:12,871 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 113 transitions. [2018-11-18 10:42:12,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 10:42:12,871 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 113 transitions. [2018-11-18 10:42:12,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-18 10:42:12,873 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:12,874 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:12,874 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:12,874 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:12,874 INFO L82 PathProgramCache]: Analyzing trace with hash 566696032, now seen corresponding path program 17 times [2018-11-18 10:42:12,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:12,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:12,875 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:12,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:12,875 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:12,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:13,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 443 proven. 595 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 10:42:13,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:13,053 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:13,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:13,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:13,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:13,054 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:13,068 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:13,068 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:13,104 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-11-18 10:42:13,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:13,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:13,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 743 proven. 157 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2018-11-18 10:42:13,200 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:13,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 743 proven. 157 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2018-11-18 10:42:13,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:13,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10, 10] total 28 [2018-11-18 10:42:13,341 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:13,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-18 10:42:13,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-18 10:42:13,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=522, Unknown=0, NotChecked=0, Total=756 [2018-11-18 10:42:13,342 INFO L87 Difference]: Start difference. First operand 106 states and 113 transitions. Second operand 28 states. [2018-11-18 10:42:13,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:13,562 INFO L93 Difference]: Finished difference Result 174 states and 197 transitions. [2018-11-18 10:42:13,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-18 10:42:13,562 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 105 [2018-11-18 10:42:13,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:13,563 INFO L225 Difference]: With dead ends: 174 [2018-11-18 10:42:13,563 INFO L226 Difference]: Without dead ends: 140 [2018-11-18 10:42:13,564 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 189 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=790, Invalid=1966, Unknown=0, NotChecked=0, Total=2756 [2018-11-18 10:42:13,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-11-18 10:42:13,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 114. [2018-11-18 10:42:13,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-11-18 10:42:13,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2018-11-18 10:42:13,570 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 105 [2018-11-18 10:42:13,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:13,570 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2018-11-18 10:42:13,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-18 10:42:13,570 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2018-11-18 10:42:13,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-11-18 10:42:13,570 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:13,571 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:13,571 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:13,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:13,571 INFO L82 PathProgramCache]: Analyzing trace with hash -223399430, now seen corresponding path program 18 times [2018-11-18 10:42:13,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:13,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:13,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:13,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:13,572 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:13,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:13,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:13,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:13,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:13,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:13,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:13,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:13,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/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 [2018-11-18 10:42:13,704 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:13,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:13,719 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:13,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:13,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:13,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:13,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:13,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:13,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:13,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-18 10:42:13,994 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:13,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-18 10:42:13,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-18 10:42:13,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-11-18 10:42:13,995 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand 21 states. [2018-11-18 10:42:14,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:14,031 INFO L93 Difference]: Finished difference Result 157 states and 174 transitions. [2018-11-18 10:42:14,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-18 10:42:14,031 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 113 [2018-11-18 10:42:14,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:14,032 INFO L225 Difference]: With dead ends: 157 [2018-11-18 10:42:14,032 INFO L226 Difference]: Without dead ends: 119 [2018-11-18 10:42:14,033 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-11-18 10:42:14,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-11-18 10:42:14,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2018-11-18 10:42:14,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-11-18 10:42:14,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 126 transitions. [2018-11-18 10:42:14,038 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 126 transitions. Word has length 113 [2018-11-18 10:42:14,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:14,038 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 126 transitions. [2018-11-18 10:42:14,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-18 10:42:14,038 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 126 transitions. [2018-11-18 10:42:14,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-11-18 10:42:14,039 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:14,039 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 26, 19, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:14,039 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:14,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:14,039 INFO L82 PathProgramCache]: Analyzing trace with hash -2116399064, now seen corresponding path program 19 times [2018-11-18 10:42:14,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:14,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:14,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:14,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:14,040 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:14,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:14,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:14,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:14,175 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:14,175 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:14,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:14,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:14,175 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:14,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:14,182 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:14,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:14,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:14,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:14,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:14,510 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:14,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-18 10:42:14,510 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:14,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 10:42:14,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 10:42:14,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-18 10:42:14,511 INFO L87 Difference]: Start difference. First operand 118 states and 126 transitions. Second operand 22 states. [2018-11-18 10:42:14,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:14,543 INFO L93 Difference]: Finished difference Result 161 states and 178 transitions. [2018-11-18 10:42:14,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 10:42:14,544 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 117 [2018-11-18 10:42:14,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:14,545 INFO L225 Difference]: With dead ends: 161 [2018-11-18 10:42:14,545 INFO L226 Difference]: Without dead ends: 123 [2018-11-18 10:42:14,546 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-18 10:42:14,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-18 10:42:14,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-11-18 10:42:14,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-11-18 10:42:14,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2018-11-18 10:42:14,551 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 117 [2018-11-18 10:42:14,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:14,552 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2018-11-18 10:42:14,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 10:42:14,552 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2018-11-18 10:42:14,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-18 10:42:14,552 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:14,552 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:14,553 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:14,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:14,553 INFO L82 PathProgramCache]: Analyzing trace with hash 751740758, now seen corresponding path program 20 times [2018-11-18 10:42:14,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:14,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:14,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:14,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:14,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:14,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:14,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 601 proven. 820 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 10:42:14,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:14,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:14,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:14,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:14,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:14,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:14,749 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:14,749 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:14,769 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-11-18 10:42:14,769 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:14,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:14,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1009 proven. 211 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2018-11-18 10:42:14,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:15,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1009 proven. 211 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2018-11-18 10:42:15,022 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:15,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11, 11] total 32 [2018-11-18 10:42:15,022 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:15,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-18 10:42:15,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-18 10:42:15,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=685, Unknown=0, NotChecked=0, Total=992 [2018-11-18 10:42:15,022 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand 32 states. [2018-11-18 10:42:15,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:15,252 INFO L93 Difference]: Finished difference Result 198 states and 224 transitions. [2018-11-18 10:42:15,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-18 10:42:15,252 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 121 [2018-11-18 10:42:15,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:15,253 INFO L225 Difference]: With dead ends: 198 [2018-11-18 10:42:15,253 INFO L226 Difference]: Without dead ends: 160 [2018-11-18 10:42:15,254 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 218 SyntacticMatches, 16 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1011 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1039, Invalid=2621, Unknown=0, NotChecked=0, Total=3660 [2018-11-18 10:42:15,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-18 10:42:15,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 130. [2018-11-18 10:42:15,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-11-18 10:42:15,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 139 transitions. [2018-11-18 10:42:15,259 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 139 transitions. Word has length 121 [2018-11-18 10:42:15,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:15,259 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 139 transitions. [2018-11-18 10:42:15,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-18 10:42:15,259 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 139 transitions. [2018-11-18 10:42:15,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-18 10:42:15,260 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:15,260 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 21, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:15,260 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:15,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:15,261 INFO L82 PathProgramCache]: Analyzing trace with hash 702953968, now seen corresponding path program 21 times [2018-11-18 10:42:15,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:15,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:15,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:15,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:15,261 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:15,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:15,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:15,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:15,453 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:15,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:15,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:15,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:15,453 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:15,460 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:15,460 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:15,480 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:15,480 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:15,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:15,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:15,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:15,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:15,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:15,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-18 10:42:15,863 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:15,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-18 10:42:15,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-18 10:42:15,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-11-18 10:42:15,864 INFO L87 Difference]: Start difference. First operand 130 states and 139 transitions. Second operand 24 states. [2018-11-18 10:42:15,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:15,895 INFO L93 Difference]: Finished difference Result 177 states and 196 transitions. [2018-11-18 10:42:15,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-18 10:42:15,895 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 129 [2018-11-18 10:42:15,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:15,896 INFO L225 Difference]: With dead ends: 177 [2018-11-18 10:42:15,896 INFO L226 Difference]: Without dead ends: 135 [2018-11-18 10:42:15,897 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-11-18 10:42:15,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-18 10:42:15,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-11-18 10:42:15,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-11-18 10:42:15,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 143 transitions. [2018-11-18 10:42:15,902 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 143 transitions. Word has length 129 [2018-11-18 10:42:15,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:15,902 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 143 transitions. [2018-11-18 10:42:15,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-18 10:42:15,902 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 143 transitions. [2018-11-18 10:42:15,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-18 10:42:15,903 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:15,903 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 30, 22, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:15,903 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:15,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:15,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1771781150, now seen corresponding path program 22 times [2018-11-18 10:42:15,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:15,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:15,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:15,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:15,904 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:15,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:16,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:16,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:16,143 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:16,144 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:16,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:16,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:16,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:16,154 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:16,154 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:16,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:16,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:16,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:16,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:16,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:16,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:16,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-18 10:42:16,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:16,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-18 10:42:16,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-18 10:42:16,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 10:42:16,598 INFO L87 Difference]: Start difference. First operand 134 states and 143 transitions. Second operand 25 states. [2018-11-18 10:42:16,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:16,629 INFO L93 Difference]: Finished difference Result 181 states and 200 transitions. [2018-11-18 10:42:16,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-18 10:42:16,629 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-11-18 10:42:16,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:16,630 INFO L225 Difference]: With dead ends: 181 [2018-11-18 10:42:16,630 INFO L226 Difference]: Without dead ends: 139 [2018-11-18 10:42:16,630 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 10:42:16,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-11-18 10:42:16,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-11-18 10:42:16,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-11-18 10:42:16,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 147 transitions. [2018-11-18 10:42:16,635 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 147 transitions. Word has length 133 [2018-11-18 10:42:16,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:16,635 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 147 transitions. [2018-11-18 10:42:16,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-18 10:42:16,635 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 147 transitions. [2018-11-18 10:42:16,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-11-18 10:42:16,636 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:16,636 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 23, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:16,636 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:16,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:16,636 INFO L82 PathProgramCache]: Analyzing trace with hash -444106932, now seen corresponding path program 23 times [2018-11-18 10:42:16,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:16,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:16,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:16,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:16,637 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:16,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:16,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 783 proven. 1081 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-18 10:42:16,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:16,830 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:16,830 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:16,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:16,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:16,830 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:16,836 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:16,836 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:16,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-18 10:42:16,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:16,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:16,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 1315 proven. 273 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2018-11-18 10:42:16,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:17,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 1315 proven. 273 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2018-11-18 10:42:17,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:17,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12, 12] total 36 [2018-11-18 10:42:17,137 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:17,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-18 10:42:17,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-18 10:42:17,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=870, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 10:42:17,138 INFO L87 Difference]: Start difference. First operand 138 states and 147 transitions. Second operand 36 states. [2018-11-18 10:42:17,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:17,449 INFO L93 Difference]: Finished difference Result 222 states and 251 transitions. [2018-11-18 10:42:17,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-18 10:42:17,450 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 137 [2018-11-18 10:42:17,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:17,451 INFO L225 Difference]: With dead ends: 222 [2018-11-18 10:42:17,451 INFO L226 Difference]: Without dead ends: 180 [2018-11-18 10:42:17,451 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 247 SyntacticMatches, 18 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1308 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1322, Invalid=3370, Unknown=0, NotChecked=0, Total=4692 [2018-11-18 10:42:17,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-11-18 10:42:17,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 146. [2018-11-18 10:42:17,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-11-18 10:42:17,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 156 transitions. [2018-11-18 10:42:17,460 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 156 transitions. Word has length 137 [2018-11-18 10:42:17,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:17,460 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 156 transitions. [2018-11-18 10:42:17,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-18 10:42:17,460 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 156 transitions. [2018-11-18 10:42:17,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-11-18 10:42:17,461 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:17,461 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 33, 24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:17,461 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:17,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:17,461 INFO L82 PathProgramCache]: Analyzing trace with hash 368968422, now seen corresponding path program 24 times [2018-11-18 10:42:17,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:17,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:17,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:17,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:17,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:17,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:17,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:17,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:17,713 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:17,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:17,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:17,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:17,713 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:17,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:17,719 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:17,738 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:17,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:17,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:17,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:17,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:18,194 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:18,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:18,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-11-18 10:42:18,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:18,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-18 10:42:18,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-18 10:42:18,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:18,211 INFO L87 Difference]: Start difference. First operand 146 states and 156 transitions. Second operand 27 states. [2018-11-18 10:42:18,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:18,264 INFO L93 Difference]: Finished difference Result 197 states and 218 transitions. [2018-11-18 10:42:18,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-18 10:42:18,265 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-11-18 10:42:18,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:18,266 INFO L225 Difference]: With dead ends: 197 [2018-11-18 10:42:18,266 INFO L226 Difference]: Without dead ends: 151 [2018-11-18 10:42:18,267 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:18,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-18 10:42:18,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-11-18 10:42:18,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-11-18 10:42:18,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 160 transitions. [2018-11-18 10:42:18,276 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 160 transitions. Word has length 145 [2018-11-18 10:42:18,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:18,276 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 160 transitions. [2018-11-18 10:42:18,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-18 10:42:18,276 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 160 transitions. [2018-11-18 10:42:18,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-11-18 10:42:18,277 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:18,277 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 25, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:18,277 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:18,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:18,278 INFO L82 PathProgramCache]: Analyzing trace with hash 502589716, now seen corresponding path program 25 times [2018-11-18 10:42:18,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:18,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:18,278 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:18,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:18,278 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:18,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:18,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:18,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:18,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:18,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:18,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:18,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:18,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:18,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:18,498 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:18,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:18,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:18,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:18,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:18,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:18,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2018-11-18 10:42:18,996 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:18,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-18 10:42:18,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-18 10:42:18,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:18,997 INFO L87 Difference]: Start difference. First operand 150 states and 160 transitions. Second operand 28 states. [2018-11-18 10:42:19,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:19,060 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2018-11-18 10:42:19,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-18 10:42:19,061 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 149 [2018-11-18 10:42:19,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:19,062 INFO L225 Difference]: With dead ends: 201 [2018-11-18 10:42:19,062 INFO L226 Difference]: Without dead ends: 155 [2018-11-18 10:42:19,063 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 273 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:19,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-11-18 10:42:19,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2018-11-18 10:42:19,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-18 10:42:19,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 164 transitions. [2018-11-18 10:42:19,069 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 164 transitions. Word has length 149 [2018-11-18 10:42:19,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:19,070 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 164 transitions. [2018-11-18 10:42:19,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-18 10:42:19,070 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 164 transitions. [2018-11-18 10:42:19,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-11-18 10:42:19,070 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:19,070 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 35, 26, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:19,071 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:19,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:19,071 INFO L82 PathProgramCache]: Analyzing trace with hash -426702782, now seen corresponding path program 26 times [2018-11-18 10:42:19,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:19,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:19,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:19,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:19,072 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:19,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:19,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 989 proven. 1378 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-18 10:42:19,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:19,304 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:19,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:19,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:19,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:19,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:19,328 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:19,328 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:19,368 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-18 10:42:19,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:19,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:19,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 1661 proven. 343 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2018-11-18 10:42:19,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:19,761 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 1661 proven. 343 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2018-11-18 10:42:19,776 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:19,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 13, 13] total 40 [2018-11-18 10:42:19,776 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:19,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-18 10:42:19,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-18 10:42:19,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=1077, Unknown=0, NotChecked=0, Total=1560 [2018-11-18 10:42:19,777 INFO L87 Difference]: Start difference. First operand 154 states and 164 transitions. Second operand 40 states. [2018-11-18 10:42:20,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:20,192 INFO L93 Difference]: Finished difference Result 246 states and 278 transitions. [2018-11-18 10:42:20,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-18 10:42:20,192 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 153 [2018-11-18 10:42:20,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:20,193 INFO L225 Difference]: With dead ends: 246 [2018-11-18 10:42:20,193 INFO L226 Difference]: Without dead ends: 200 [2018-11-18 10:42:20,195 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 276 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1643 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1639, Invalid=4213, Unknown=0, NotChecked=0, Total=5852 [2018-11-18 10:42:20,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-11-18 10:42:20,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 162. [2018-11-18 10:42:20,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-11-18 10:42:20,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 173 transitions. [2018-11-18 10:42:20,204 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 173 transitions. Word has length 153 [2018-11-18 10:42:20,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:20,204 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 173 transitions. [2018-11-18 10:42:20,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-18 10:42:20,204 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 173 transitions. [2018-11-18 10:42:20,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-11-18 10:42:20,205 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:20,205 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 27, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:20,205 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:20,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:20,205 INFO L82 PathProgramCache]: Analyzing trace with hash -2049569572, now seen corresponding path program 27 times [2018-11-18 10:42:20,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:20,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:20,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:20,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:20,206 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:20,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:20,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:20,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:20,654 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:20,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:20,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:20,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:20,655 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:20,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:20,664 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:20,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:20,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:20,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:20,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:21,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:21,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2018-11-18 10:42:21,269 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:21,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-18 10:42:21,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-18 10:42:21,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:21,270 INFO L87 Difference]: Start difference. First operand 162 states and 173 transitions. Second operand 30 states. [2018-11-18 10:42:21,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:21,323 INFO L93 Difference]: Finished difference Result 217 states and 240 transitions. [2018-11-18 10:42:21,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-18 10:42:21,324 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 161 [2018-11-18 10:42:21,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:21,324 INFO L225 Difference]: With dead ends: 217 [2018-11-18 10:42:21,324 INFO L226 Difference]: Without dead ends: 167 [2018-11-18 10:42:21,325 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 295 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:21,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-11-18 10:42:21,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2018-11-18 10:42:21,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-11-18 10:42:21,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 177 transitions. [2018-11-18 10:42:21,332 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 177 transitions. Word has length 161 [2018-11-18 10:42:21,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:21,332 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 177 transitions. [2018-11-18 10:42:21,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-18 10:42:21,332 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 177 transitions. [2018-11-18 10:42:21,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-11-18 10:42:21,333 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:21,333 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 28, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:21,333 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:21,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:21,334 INFO L82 PathProgramCache]: Analyzing trace with hash -37300470, now seen corresponding path program 28 times [2018-11-18 10:42:21,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:21,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:21,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:21,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:21,334 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:21,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:21,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:21,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:21,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:21,598 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:21,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:21,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:21,599 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:21,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:21,607 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:21,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:21,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:21,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:21,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:22,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:22,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:22,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 52 [2018-11-18 10:42:22,198 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:22,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-18 10:42:22,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-18 10:42:22,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:22,200 INFO L87 Difference]: Start difference. First operand 166 states and 177 transitions. Second operand 31 states. [2018-11-18 10:42:22,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:22,268 INFO L93 Difference]: Finished difference Result 221 states and 244 transitions. [2018-11-18 10:42:22,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-18 10:42:22,269 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 165 [2018-11-18 10:42:22,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:22,270 INFO L225 Difference]: With dead ends: 221 [2018-11-18 10:42:22,270 INFO L226 Difference]: Without dead ends: 171 [2018-11-18 10:42:22,273 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 302 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:22,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-11-18 10:42:22,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2018-11-18 10:42:22,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-11-18 10:42:22,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 181 transitions. [2018-11-18 10:42:22,284 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 181 transitions. Word has length 165 [2018-11-18 10:42:22,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:22,284 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 181 transitions. [2018-11-18 10:42:22,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-18 10:42:22,284 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 181 transitions. [2018-11-18 10:42:22,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-11-18 10:42:22,285 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:22,285 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 39, 29, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:22,285 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:22,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:22,286 INFO L82 PathProgramCache]: Analyzing trace with hash 516610616, now seen corresponding path program 29 times [2018-11-18 10:42:22,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:22,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:22,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:22,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:22,286 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:22,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1219 proven. 1711 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-18 10:42:22,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:22,564 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:22,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:22,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:22,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:22,565 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:22,572 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:22,572 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:22,610 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-18 10:42:22,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:22,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:22,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 2047 proven. 421 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2018-11-18 10:42:22,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:23,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 2047 proven. 421 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2018-11-18 10:42:23,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:23,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 14, 14] total 44 [2018-11-18 10:42:23,028 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:23,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-18 10:42:23,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-18 10:42:23,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=586, Invalid=1306, Unknown=0, NotChecked=0, Total=1892 [2018-11-18 10:42:23,029 INFO L87 Difference]: Start difference. First operand 170 states and 181 transitions. Second operand 44 states. [2018-11-18 10:42:23,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:23,439 INFO L93 Difference]: Finished difference Result 270 states and 305 transitions. [2018-11-18 10:42:23,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-18 10:42:23,439 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 169 [2018-11-18 10:42:23,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:23,439 INFO L225 Difference]: With dead ends: 270 [2018-11-18 10:42:23,440 INFO L226 Difference]: Without dead ends: 220 [2018-11-18 10:42:23,440 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 305 SyntacticMatches, 22 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1990, Invalid=5150, Unknown=0, NotChecked=0, Total=7140 [2018-11-18 10:42:23,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-11-18 10:42:23,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 178. [2018-11-18 10:42:23,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-18 10:42:23,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2018-11-18 10:42:23,453 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 169 [2018-11-18 10:42:23,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:23,454 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2018-11-18 10:42:23,454 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-18 10:42:23,454 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2018-11-18 10:42:23,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-18 10:42:23,455 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:23,455 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 41, 30, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:23,455 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:23,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:23,455 INFO L82 PathProgramCache]: Analyzing trace with hash 2089670610, now seen corresponding path program 30 times [2018-11-18 10:42:23,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:23,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:23,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:23,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:23,456 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:23,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:23,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:23,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:23,770 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:23,770 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:23,770 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:23,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:23,771 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:23,778 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:23,778 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:23,801 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:23,802 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:23,804 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:23,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:23,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:24,357 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:24,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:24,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2018-11-18 10:42:24,372 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:24,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-18 10:42:24,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-18 10:42:24,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:24,373 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand 33 states. [2018-11-18 10:42:24,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:24,419 INFO L93 Difference]: Finished difference Result 237 states and 262 transitions. [2018-11-18 10:42:24,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-18 10:42:24,419 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 177 [2018-11-18 10:42:24,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:24,420 INFO L225 Difference]: With dead ends: 237 [2018-11-18 10:42:24,420 INFO L226 Difference]: Without dead ends: 183 [2018-11-18 10:42:24,421 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 324 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:24,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-11-18 10:42:24,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 182. [2018-11-18 10:42:24,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-11-18 10:42:24,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 194 transitions. [2018-11-18 10:42:24,429 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 194 transitions. Word has length 177 [2018-11-18 10:42:24,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:24,429 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 194 transitions. [2018-11-18 10:42:24,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-18 10:42:24,429 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 194 transitions. [2018-11-18 10:42:24,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-11-18 10:42:24,430 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:24,430 INFO L375 BasicCegarLoop]: trace histogram [43, 43, 42, 31, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:24,430 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:24,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:24,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1674541568, now seen corresponding path program 31 times [2018-11-18 10:42:24,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:24,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:24,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:24,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:24,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:24,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:24,716 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:24,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:24,716 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:24,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:24,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:24,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:24,716 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:24,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:24,722 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:24,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:24,751 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:24,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:24,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:25,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:25,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:25,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2018-11-18 10:42:25,298 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:25,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-18 10:42:25,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-18 10:42:25,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:25,299 INFO L87 Difference]: Start difference. First operand 182 states and 194 transitions. Second operand 34 states. [2018-11-18 10:42:25,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:25,375 INFO L93 Difference]: Finished difference Result 241 states and 266 transitions. [2018-11-18 10:42:25,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-18 10:42:25,376 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 181 [2018-11-18 10:42:25,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:25,376 INFO L225 Difference]: With dead ends: 241 [2018-11-18 10:42:25,376 INFO L226 Difference]: Without dead ends: 187 [2018-11-18 10:42:25,376 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 331 SyntacticMatches, 14 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:25,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-18 10:42:25,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-11-18 10:42:25,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-11-18 10:42:25,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 198 transitions. [2018-11-18 10:42:25,384 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 198 transitions. Word has length 181 [2018-11-18 10:42:25,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:25,384 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 198 transitions. [2018-11-18 10:42:25,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-18 10:42:25,384 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 198 transitions. [2018-11-18 10:42:25,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-11-18 10:42:25,385 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:25,385 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 32, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:25,385 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:25,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:25,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1319867090, now seen corresponding path program 32 times [2018-11-18 10:42:25,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:25,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:25,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:25,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:25,386 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:25,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:25,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1473 proven. 2080 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-18 10:42:25,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:25,696 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:25,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:25,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:25,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:25,696 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:25,702 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:25,702 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:25,735 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-18 10:42:25,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:25,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:25,979 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 2473 proven. 507 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-11-18 10:42:25,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:26,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 2473 proven. 507 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-11-18 10:42:26,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:26,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 15, 15] total 48 [2018-11-18 10:42:26,318 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:26,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-18 10:42:26,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-18 10:42:26,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=1557, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 10:42:26,319 INFO L87 Difference]: Start difference. First operand 186 states and 198 transitions. Second operand 48 states. [2018-11-18 10:42:26,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:26,797 INFO L93 Difference]: Finished difference Result 294 states and 332 transitions. [2018-11-18 10:42:26,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-11-18 10:42:26,797 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 185 [2018-11-18 10:42:26,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:26,798 INFO L225 Difference]: With dead ends: 294 [2018-11-18 10:42:26,798 INFO L226 Difference]: Without dead ends: 240 [2018-11-18 10:42:26,799 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 334 SyntacticMatches, 24 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2427 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2375, Invalid=6181, Unknown=0, NotChecked=0, Total=8556 [2018-11-18 10:42:26,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-11-18 10:42:26,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 194. [2018-11-18 10:42:26,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-11-18 10:42:26,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 207 transitions. [2018-11-18 10:42:26,808 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 207 transitions. Word has length 185 [2018-11-18 10:42:26,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:26,808 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 207 transitions. [2018-11-18 10:42:26,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-18 10:42:26,809 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 207 transitions. [2018-11-18 10:42:26,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-11-18 10:42:26,809 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:26,809 INFO L375 BasicCegarLoop]: trace histogram [46, 46, 45, 33, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:26,810 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:26,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:26,810 INFO L82 PathProgramCache]: Analyzing trace with hash 293921736, now seen corresponding path program 33 times [2018-11-18 10:42:26,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:26,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:26,810 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:26,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:26,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:26,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:27,148 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:27,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:27,148 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:27,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:27,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:27,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:27,149 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:27,156 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:27,157 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:27,188 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:27,189 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:27,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:27,208 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:27,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:27,730 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:27,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:27,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 52 [2018-11-18 10:42:27,745 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:27,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-18 10:42:27,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-18 10:42:27,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:27,746 INFO L87 Difference]: Start difference. First operand 194 states and 207 transitions. Second operand 36 states. [2018-11-18 10:42:27,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:27,804 INFO L93 Difference]: Finished difference Result 257 states and 284 transitions. [2018-11-18 10:42:27,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-18 10:42:27,804 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 193 [2018-11-18 10:42:27,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:27,805 INFO L225 Difference]: With dead ends: 257 [2018-11-18 10:42:27,805 INFO L226 Difference]: Without dead ends: 199 [2018-11-18 10:42:27,805 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 353 SyntacticMatches, 18 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:27,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-11-18 10:42:27,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-11-18 10:42:27,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-11-18 10:42:27,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 211 transitions. [2018-11-18 10:42:27,814 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 211 transitions. Word has length 193 [2018-11-18 10:42:27,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:27,814 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 211 transitions. [2018-11-18 10:42:27,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-18 10:42:27,814 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 211 transitions. [2018-11-18 10:42:27,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-11-18 10:42:27,815 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:27,815 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 34, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:27,815 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:27,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:27,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1601079818, now seen corresponding path program 34 times [2018-11-18 10:42:27,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:27,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:27,816 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:27,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:27,816 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:27,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:28,222 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:28,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:28,223 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:28,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:28,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:28,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:28,223 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:28,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:28,231 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:28,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:28,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:28,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:28,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:28,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:28,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 52 [2018-11-18 10:42:28,896 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:28,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-18 10:42:28,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-18 10:42:28,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:28,897 INFO L87 Difference]: Start difference. First operand 198 states and 211 transitions. Second operand 37 states. [2018-11-18 10:42:28,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:28,965 INFO L93 Difference]: Finished difference Result 261 states and 288 transitions. [2018-11-18 10:42:28,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-18 10:42:28,966 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 197 [2018-11-18 10:42:28,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:28,966 INFO L225 Difference]: With dead ends: 261 [2018-11-18 10:42:28,967 INFO L226 Difference]: Without dead ends: 203 [2018-11-18 10:42:28,967 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 360 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:28,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-11-18 10:42:28,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2018-11-18 10:42:28,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-11-18 10:42:28,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 215 transitions. [2018-11-18 10:42:28,977 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 215 transitions. Word has length 197 [2018-11-18 10:42:28,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:28,977 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 215 transitions. [2018-11-18 10:42:28,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-18 10:42:28,977 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 215 transitions. [2018-11-18 10:42:28,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-11-18 10:42:28,978 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:28,978 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 35, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:28,978 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:28,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:28,978 INFO L82 PathProgramCache]: Analyzing trace with hash -712163036, now seen corresponding path program 35 times [2018-11-18 10:42:28,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:28,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:28,979 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:28,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:28,979 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:28,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:29,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 1751 proven. 2485 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-18 10:42:29,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:29,353 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:29,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:29,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:29,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:29,353 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:29,361 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:29,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:29,403 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-11-18 10:42:29,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:29,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:29,611 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2939 proven. 601 refuted. 0 times theorem prover too weak. 972 trivial. 0 not checked. [2018-11-18 10:42:29,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:29,970 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2939 proven. 601 refuted. 0 times theorem prover too weak. 972 trivial. 0 not checked. [2018-11-18 10:42:29,985 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:29,985 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 16, 16] total 52 [2018-11-18 10:42:29,985 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:29,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-18 10:42:29,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-18 10:42:29,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=1830, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:29,986 INFO L87 Difference]: Start difference. First operand 202 states and 215 transitions. Second operand 52 states. [2018-11-18 10:42:30,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:30,505 INFO L93 Difference]: Finished difference Result 318 states and 359 transitions. [2018-11-18 10:42:30,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-18 10:42:30,505 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 201 [2018-11-18 10:42:30,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:30,506 INFO L225 Difference]: With dead ends: 318 [2018-11-18 10:42:30,506 INFO L226 Difference]: Without dead ends: 260 [2018-11-18 10:42:30,507 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 363 SyntacticMatches, 26 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2876 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2794, Invalid=7306, Unknown=0, NotChecked=0, Total=10100 [2018-11-18 10:42:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2018-11-18 10:42:30,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 210. [2018-11-18 10:42:30,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-11-18 10:42:30,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 224 transitions. [2018-11-18 10:42:30,518 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 224 transitions. Word has length 201 [2018-11-18 10:42:30,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:30,518 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 224 transitions. [2018-11-18 10:42:30,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-18 10:42:30,518 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 224 transitions. [2018-11-18 10:42:30,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-11-18 10:42:30,519 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:30,519 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 36, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:30,519 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:30,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:30,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1348120766, now seen corresponding path program 36 times [2018-11-18 10:42:30,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:30,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:30,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:30,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:30,520 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:30,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:30,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:30,961 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:30,961 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:30,961 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:30,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:30,962 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:30,968 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:30,969 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:30,998 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:30,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:31,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:31,022 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:31,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:31,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:31,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:31,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 52 [2018-11-18 10:42:31,611 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:31,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-18 10:42:31,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-18 10:42:31,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:31,612 INFO L87 Difference]: Start difference. First operand 210 states and 224 transitions. Second operand 39 states. [2018-11-18 10:42:31,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:31,685 INFO L93 Difference]: Finished difference Result 277 states and 306 transitions. [2018-11-18 10:42:31,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-18 10:42:31,685 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 209 [2018-11-18 10:42:31,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:31,685 INFO L225 Difference]: With dead ends: 277 [2018-11-18 10:42:31,685 INFO L226 Difference]: Without dead ends: 215 [2018-11-18 10:42:31,686 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 382 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:31,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-11-18 10:42:31,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2018-11-18 10:42:31,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-11-18 10:42:31,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 228 transitions. [2018-11-18 10:42:31,701 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 228 transitions. Word has length 209 [2018-11-18 10:42:31,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:31,701 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 228 transitions. [2018-11-18 10:42:31,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-18 10:42:31,701 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 228 transitions. [2018-11-18 10:42:31,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-11-18 10:42:31,701 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:31,701 INFO L375 BasicCegarLoop]: trace histogram [51, 51, 50, 37, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:31,701 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:31,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:31,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1500961044, now seen corresponding path program 37 times [2018-11-18 10:42:31,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:31,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:31,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:31,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:31,702 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:31,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:32,114 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:32,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:32,114 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:32,114 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:32,114 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:32,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:32,114 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:32,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:32,121 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:32,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:32,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:32,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:32,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:32,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:32,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:32,772 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-11-18 10:42:32,772 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:32,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-18 10:42:32,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-18 10:42:32,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:32,773 INFO L87 Difference]: Start difference. First operand 214 states and 228 transitions. Second operand 40 states. [2018-11-18 10:42:32,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:32,833 INFO L93 Difference]: Finished difference Result 281 states and 310 transitions. [2018-11-18 10:42:32,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-18 10:42:32,833 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 213 [2018-11-18 10:42:32,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:32,834 INFO L225 Difference]: With dead ends: 281 [2018-11-18 10:42:32,834 INFO L226 Difference]: Without dead ends: 219 [2018-11-18 10:42:32,834 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 389 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:32,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-11-18 10:42:32,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2018-11-18 10:42:32,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2018-11-18 10:42:32,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 232 transitions. [2018-11-18 10:42:32,845 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 232 transitions. Word has length 213 [2018-11-18 10:42:32,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:32,845 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 232 transitions. [2018-11-18 10:42:32,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-18 10:42:32,845 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 232 transitions. [2018-11-18 10:42:32,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-11-18 10:42:32,846 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:32,846 INFO L375 BasicCegarLoop]: trace histogram [52, 52, 51, 38, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:32,846 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:32,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:32,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1223371238, now seen corresponding path program 38 times [2018-11-18 10:42:32,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:32,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:32,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:32,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:32,847 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:32,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:33,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2053 proven. 2926 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-18 10:42:33,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:33,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:33,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:33,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:33,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:33,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:33,250 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:33,250 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:33,288 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-11-18 10:42:33,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:33,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:33,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 3445 proven. 703 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2018-11-18 10:42:33,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:33,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 3445 proven. 703 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2018-11-18 10:42:33,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:33,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 17, 17] total 56 [2018-11-18 10:42:33,918 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:33,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-11-18 10:42:33,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-11-18 10:42:33,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2125, Unknown=0, NotChecked=0, Total=3080 [2018-11-18 10:42:33,919 INFO L87 Difference]: Start difference. First operand 218 states and 232 transitions. Second operand 56 states. [2018-11-18 10:42:34,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:34,487 INFO L93 Difference]: Finished difference Result 342 states and 386 transitions. [2018-11-18 10:42:34,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-18 10:42:34,488 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 217 [2018-11-18 10:42:34,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:34,488 INFO L225 Difference]: With dead ends: 342 [2018-11-18 10:42:34,488 INFO L226 Difference]: Without dead ends: 280 [2018-11-18 10:42:34,489 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 392 SyntacticMatches, 28 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3363 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=3247, Invalid=8525, Unknown=0, NotChecked=0, Total=11772 [2018-11-18 10:42:34,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2018-11-18 10:42:34,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 226. [2018-11-18 10:42:34,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-11-18 10:42:34,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 241 transitions. [2018-11-18 10:42:34,507 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 241 transitions. Word has length 217 [2018-11-18 10:42:34,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:34,507 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 241 transitions. [2018-11-18 10:42:34,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-11-18 10:42:34,507 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 241 transitions. [2018-11-18 10:42:34,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-11-18 10:42:34,508 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:34,508 INFO L375 BasicCegarLoop]: trace histogram [54, 54, 53, 39, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:34,508 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:34,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:34,508 INFO L82 PathProgramCache]: Analyzing trace with hash 418299572, now seen corresponding path program 39 times [2018-11-18 10:42:34,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:34,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:34,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:34,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:34,509 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:34,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:34,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:34,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:34,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:34,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:34,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:34,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:34,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:34,927 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:34,927 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:34,954 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:34,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:34,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:34,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:34,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:35,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:35,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:35,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 52 [2018-11-18 10:42:35,591 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:35,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-18 10:42:35,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-18 10:42:35,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:35,592 INFO L87 Difference]: Start difference. First operand 226 states and 241 transitions. Second operand 42 states. [2018-11-18 10:42:35,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:35,703 INFO L93 Difference]: Finished difference Result 297 states and 328 transitions. [2018-11-18 10:42:35,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-18 10:42:35,703 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-11-18 10:42:35,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:35,704 INFO L225 Difference]: With dead ends: 297 [2018-11-18 10:42:35,704 INFO L226 Difference]: Without dead ends: 231 [2018-11-18 10:42:35,704 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 411 SyntacticMatches, 30 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:35,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-11-18 10:42:35,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 230. [2018-11-18 10:42:35,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-11-18 10:42:35,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 245 transitions. [2018-11-18 10:42:35,720 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 245 transitions. Word has length 225 [2018-11-18 10:42:35,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:35,720 INFO L480 AbstractCegarLoop]: Abstraction has 230 states and 245 transitions. [2018-11-18 10:42:35,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-18 10:42:35,720 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 245 transitions. [2018-11-18 10:42:35,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-11-18 10:42:35,720 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:35,720 INFO L375 BasicCegarLoop]: trace histogram [55, 55, 54, 40, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:35,720 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:35,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:35,721 INFO L82 PathProgramCache]: Analyzing trace with hash 502733026, now seen corresponding path program 40 times [2018-11-18 10:42:35,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:35,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:35,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:35,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:35,721 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:35,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:36,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:36,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:36,180 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:36,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:36,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:36,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:36,180 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:36,186 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:36,186 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:36,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:36,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:36,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:36,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:36,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:36,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:36,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 52 [2018-11-18 10:42:36,839 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:36,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-18 10:42:36,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-18 10:42:36,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:36,840 INFO L87 Difference]: Start difference. First operand 230 states and 245 transitions. Second operand 43 states. [2018-11-18 10:42:36,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:36,933 INFO L93 Difference]: Finished difference Result 301 states and 332 transitions. [2018-11-18 10:42:36,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-18 10:42:36,933 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 229 [2018-11-18 10:42:36,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:36,934 INFO L225 Difference]: With dead ends: 301 [2018-11-18 10:42:36,934 INFO L226 Difference]: Without dead ends: 235 [2018-11-18 10:42:36,935 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 418 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:36,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-11-18 10:42:36,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 234. [2018-11-18 10:42:36,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-11-18 10:42:36,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 249 transitions. [2018-11-18 10:42:36,962 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 249 transitions. Word has length 229 [2018-11-18 10:42:36,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:36,963 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 249 transitions. [2018-11-18 10:42:36,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-18 10:42:36,963 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 249 transitions. [2018-11-18 10:42:36,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-11-18 10:42:36,964 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:36,964 INFO L375 BasicCegarLoop]: trace histogram [56, 56, 55, 41, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:36,964 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:36,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:36,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1439345680, now seen corresponding path program 41 times [2018-11-18 10:42:36,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:36,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:36,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:36,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:36,966 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:36,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:37,505 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2379 proven. 3403 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-18 10:42:37,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:37,505 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:37,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:37,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:37,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:37,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:37,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:37,512 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:37,555 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-11-18 10:42:37,556 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:37,558 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 3991 proven. 813 refuted. 0 times theorem prover too weak. 1356 trivial. 0 not checked. [2018-11-18 10:42:37,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:38,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 3991 proven. 813 refuted. 0 times theorem prover too weak. 1356 trivial. 0 not checked. [2018-11-18 10:42:38,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:38,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 18, 18] total 60 [2018-11-18 10:42:38,323 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:38,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-11-18 10:42:38,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-11-18 10:42:38,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1098, Invalid=2442, Unknown=0, NotChecked=0, Total=3540 [2018-11-18 10:42:38,324 INFO L87 Difference]: Start difference. First operand 234 states and 249 transitions. Second operand 60 states. [2018-11-18 10:42:38,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:38,986 INFO L93 Difference]: Finished difference Result 366 states and 413 transitions. [2018-11-18 10:42:38,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-18 10:42:38,987 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 233 [2018-11-18 10:42:38,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:38,988 INFO L225 Difference]: With dead ends: 366 [2018-11-18 10:42:38,988 INFO L226 Difference]: Without dead ends: 300 [2018-11-18 10:42:38,989 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 421 SyntacticMatches, 30 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3888 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3734, Invalid=9838, Unknown=0, NotChecked=0, Total=13572 [2018-11-18 10:42:38,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2018-11-18 10:42:39,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 242. [2018-11-18 10:42:39,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-11-18 10:42:39,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 258 transitions. [2018-11-18 10:42:39,005 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 258 transitions. Word has length 233 [2018-11-18 10:42:39,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:39,006 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 258 transitions. [2018-11-18 10:42:39,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-11-18 10:42:39,006 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 258 transitions. [2018-11-18 10:42:39,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2018-11-18 10:42:39,006 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:39,006 INFO L375 BasicCegarLoop]: trace histogram [58, 58, 57, 42, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:39,007 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:39,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:39,007 INFO L82 PathProgramCache]: Analyzing trace with hash -10449494, now seen corresponding path program 42 times [2018-11-18 10:42:39,007 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:39,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:39,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:39,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:39,007 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:39,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:39,510 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:39,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:39,510 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:39,510 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:39,510 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:39,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:39,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:39,517 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:39,517 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:39,546 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:39,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:39,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:39,583 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:39,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:40,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:40,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:40,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 52 [2018-11-18 10:42:40,218 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:40,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-18 10:42:40,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-18 10:42:40,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:40,218 INFO L87 Difference]: Start difference. First operand 242 states and 258 transitions. Second operand 45 states. [2018-11-18 10:42:40,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:40,314 INFO L93 Difference]: Finished difference Result 317 states and 350 transitions. [2018-11-18 10:42:40,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-18 10:42:40,316 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 241 [2018-11-18 10:42:40,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:40,316 INFO L225 Difference]: With dead ends: 317 [2018-11-18 10:42:40,317 INFO L226 Difference]: Without dead ends: 247 [2018-11-18 10:42:40,317 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 440 SyntacticMatches, 36 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:40,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-11-18 10:42:40,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 246. [2018-11-18 10:42:40,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-11-18 10:42:40,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 262 transitions. [2018-11-18 10:42:40,333 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 262 transitions. Word has length 241 [2018-11-18 10:42:40,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:40,333 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 262 transitions. [2018-11-18 10:42:40,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-18 10:42:40,333 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 262 transitions. [2018-11-18 10:42:40,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-11-18 10:42:40,334 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:40,334 INFO L375 BasicCegarLoop]: trace histogram [59, 59, 58, 43, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:40,334 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:40,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:40,334 INFO L82 PathProgramCache]: Analyzing trace with hash 721079256, now seen corresponding path program 43 times [2018-11-18 10:42:40,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:40,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:40,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:40,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:40,335 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:40,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:40,887 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:40,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:40,887 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:40,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:40,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:40,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:40,888 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:40,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:40,897 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:40,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:40,958 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:40,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:41,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:41,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:41,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 52 [2018-11-18 10:42:41,632 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:41,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-18 10:42:41,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-18 10:42:41,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:41,633 INFO L87 Difference]: Start difference. First operand 246 states and 262 transitions. Second operand 46 states. [2018-11-18 10:42:41,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:41,719 INFO L93 Difference]: Finished difference Result 321 states and 354 transitions. [2018-11-18 10:42:41,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-18 10:42:41,719 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 245 [2018-11-18 10:42:41,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:41,720 INFO L225 Difference]: With dead ends: 321 [2018-11-18 10:42:41,720 INFO L226 Difference]: Without dead ends: 251 [2018-11-18 10:42:41,720 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 447 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:41,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-11-18 10:42:41,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2018-11-18 10:42:41,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2018-11-18 10:42:41,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 266 transitions. [2018-11-18 10:42:41,733 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 266 transitions. Word has length 245 [2018-11-18 10:42:41,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:41,734 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 266 transitions. [2018-11-18 10:42:41,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-18 10:42:41,734 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 266 transitions. [2018-11-18 10:42:41,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2018-11-18 10:42:41,735 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:41,735 INFO L375 BasicCegarLoop]: trace histogram [60, 60, 59, 44, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:41,735 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:41,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:41,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1708016390, now seen corresponding path program 44 times [2018-11-18 10:42:41,735 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:41,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:41,736 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:41,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:41,736 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:41,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:42,245 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 2729 proven. 3916 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-18 10:42:42,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:42,245 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:42,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:42,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:42,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:42,245 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:42,253 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:42,253 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:42,301 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-11-18 10:42:42,301 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:42,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:42,595 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 4577 proven. 931 refuted. 0 times theorem prover too weak. 1572 trivial. 0 not checked. [2018-11-18 10:42:42,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 4577 proven. 931 refuted. 0 times theorem prover too weak. 1572 trivial. 0 not checked. [2018-11-18 10:42:43,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:43,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 19, 19] total 64 [2018-11-18 10:42:43,102 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:43,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-18 10:42:43,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-18 10:42:43,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1251, Invalid=2781, Unknown=0, NotChecked=0, Total=4032 [2018-11-18 10:42:43,104 INFO L87 Difference]: Start difference. First operand 250 states and 266 transitions. Second operand 64 states. [2018-11-18 10:42:43,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:43,820 INFO L93 Difference]: Finished difference Result 390 states and 440 transitions. [2018-11-18 10:42:43,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-11-18 10:42:43,820 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 249 [2018-11-18 10:42:43,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:43,821 INFO L225 Difference]: With dead ends: 390 [2018-11-18 10:42:43,821 INFO L226 Difference]: Without dead ends: 320 [2018-11-18 10:42:43,821 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 450 SyntacticMatches, 32 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4451 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=4255, Invalid=11245, Unknown=0, NotChecked=0, Total=15500 [2018-11-18 10:42:43,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2018-11-18 10:42:43,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 258. [2018-11-18 10:42:43,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2018-11-18 10:42:43,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 275 transitions. [2018-11-18 10:42:43,838 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 275 transitions. Word has length 249 [2018-11-18 10:42:43,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:43,838 INFO L480 AbstractCegarLoop]: Abstraction has 258 states and 275 transitions. [2018-11-18 10:42:43,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-18 10:42:43,838 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 275 transitions. [2018-11-18 10:42:43,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2018-11-18 10:42:43,839 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:43,839 INFO L375 BasicCegarLoop]: trace histogram [62, 62, 61, 45, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:43,839 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:43,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:43,839 INFO L82 PathProgramCache]: Analyzing trace with hash 739220896, now seen corresponding path program 45 times [2018-11-18 10:42:43,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:43,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:43,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:43,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:43,840 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:43,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:44,363 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:44,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:44,363 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:44,363 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:44,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:44,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:44,363 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:44,371 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:44,371 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:44,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:44,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:44,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:44,432 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:44,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:45,027 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:45,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:45,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 52 [2018-11-18 10:42:45,042 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:45,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-18 10:42:45,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-18 10:42:45,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:45,043 INFO L87 Difference]: Start difference. First operand 258 states and 275 transitions. Second operand 48 states. [2018-11-18 10:42:45,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:45,146 INFO L93 Difference]: Finished difference Result 337 states and 372 transitions. [2018-11-18 10:42:45,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-18 10:42:45,146 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 257 [2018-11-18 10:42:45,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:45,147 INFO L225 Difference]: With dead ends: 337 [2018-11-18 10:42:45,147 INFO L226 Difference]: Without dead ends: 263 [2018-11-18 10:42:45,147 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 469 SyntacticMatches, 42 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:45,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-11-18 10:42:45,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2018-11-18 10:42:45,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-11-18 10:42:45,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 279 transitions. [2018-11-18 10:42:45,166 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 279 transitions. Word has length 257 [2018-11-18 10:42:45,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:45,166 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 279 transitions. [2018-11-18 10:42:45,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-18 10:42:45,167 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 279 transitions. [2018-11-18 10:42:45,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-11-18 10:42:45,167 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:45,167 INFO L375 BasicCegarLoop]: trace histogram [63, 63, 62, 46, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:45,167 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:45,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:45,168 INFO L82 PathProgramCache]: Analyzing trace with hash -2047623218, now seen corresponding path program 46 times [2018-11-18 10:42:45,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:45,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:45,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:45,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:45,168 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:45,720 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:45,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:45,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:45,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:45,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:45,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:45,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:45,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:45,730 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:45,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:45,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:45,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:45,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:46,381 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:46,396 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:46,396 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2018-11-18 10:42:46,396 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:46,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-18 10:42:46,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-18 10:42:46,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:46,397 INFO L87 Difference]: Start difference. First operand 262 states and 279 transitions. Second operand 49 states. [2018-11-18 10:42:46,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:46,487 INFO L93 Difference]: Finished difference Result 341 states and 376 transitions. [2018-11-18 10:42:46,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-18 10:42:46,487 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 261 [2018-11-18 10:42:46,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:46,488 INFO L225 Difference]: With dead ends: 341 [2018-11-18 10:42:46,488 INFO L226 Difference]: Without dead ends: 267 [2018-11-18 10:42:46,489 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 476 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:46,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-11-18 10:42:46,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 266. [2018-11-18 10:42:46,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2018-11-18 10:42:46,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 283 transitions. [2018-11-18 10:42:46,507 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 283 transitions. Word has length 261 [2018-11-18 10:42:46,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:46,507 INFO L480 AbstractCegarLoop]: Abstraction has 266 states and 283 transitions. [2018-11-18 10:42:46,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-18 10:42:46,508 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 283 transitions. [2018-11-18 10:42:46,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2018-11-18 10:42:46,509 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:46,509 INFO L375 BasicCegarLoop]: trace histogram [64, 64, 63, 47, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:46,509 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:46,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:46,509 INFO L82 PathProgramCache]: Analyzing trace with hash 796859132, now seen corresponding path program 47 times [2018-11-18 10:42:46,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:46,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:46,510 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:46,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:46,510 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:46,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:47,087 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 3103 proven. 4465 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-18 10:42:47,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:47,087 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:47,087 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:47,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:47,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:47,087 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:47,095 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:47,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:47,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-11-18 10:42:47,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:47,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:47,580 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 5203 proven. 1057 refuted. 0 times theorem prover too weak. 1804 trivial. 0 not checked. [2018-11-18 10:42:47,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 5203 proven. 1057 refuted. 0 times theorem prover too weak. 1804 trivial. 0 not checked. [2018-11-18 10:42:48,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:48,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 20, 20] total 68 [2018-11-18 10:42:48,158 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:48,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-11-18 10:42:48,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-11-18 10:42:48,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1414, Invalid=3142, Unknown=0, NotChecked=0, Total=4556 [2018-11-18 10:42:48,159 INFO L87 Difference]: Start difference. First operand 266 states and 283 transitions. Second operand 68 states. [2018-11-18 10:42:48,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:48,946 INFO L93 Difference]: Finished difference Result 414 states and 467 transitions. [2018-11-18 10:42:48,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-11-18 10:42:48,946 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 265 [2018-11-18 10:42:48,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:48,947 INFO L225 Difference]: With dead ends: 414 [2018-11-18 10:42:48,947 INFO L226 Difference]: Without dead ends: 340 [2018-11-18 10:42:48,948 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 479 SyntacticMatches, 34 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5052 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4810, Invalid=12746, Unknown=0, NotChecked=0, Total=17556 [2018-11-18 10:42:48,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2018-11-18 10:42:48,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 274. [2018-11-18 10:42:48,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-11-18 10:42:48,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 292 transitions. [2018-11-18 10:42:48,967 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 292 transitions. Word has length 265 [2018-11-18 10:42:48,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:48,967 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 292 transitions. [2018-11-18 10:42:48,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-11-18 10:42:48,967 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 292 transitions. [2018-11-18 10:42:48,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-11-18 10:42:48,968 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:48,968 INFO L375 BasicCegarLoop]: trace histogram [66, 66, 65, 48, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:48,968 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:48,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:48,968 INFO L82 PathProgramCache]: Analyzing trace with hash 1000042134, now seen corresponding path program 48 times [2018-11-18 10:42:48,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:48,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:48,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:48,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:48,969 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:48,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:49,591 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:49,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:49,591 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:49,591 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:49,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:49,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:49,592 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:49,598 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:49,599 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:49,630 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:49,630 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:49,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:49,664 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:49,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:50,259 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:50,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:50,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2018-11-18 10:42:50,274 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:50,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-18 10:42:50,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-18 10:42:50,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:50,275 INFO L87 Difference]: Start difference. First operand 274 states and 292 transitions. Second operand 51 states. [2018-11-18 10:42:50,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:50,371 INFO L93 Difference]: Finished difference Result 357 states and 394 transitions. [2018-11-18 10:42:50,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-18 10:42:50,372 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 273 [2018-11-18 10:42:50,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:50,373 INFO L225 Difference]: With dead ends: 357 [2018-11-18 10:42:50,373 INFO L226 Difference]: Without dead ends: 279 [2018-11-18 10:42:50,373 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 498 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:50,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-11-18 10:42:50,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2018-11-18 10:42:50,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2018-11-18 10:42:50,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 296 transitions. [2018-11-18 10:42:50,393 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 296 transitions. Word has length 273 [2018-11-18 10:42:50,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:50,393 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 296 transitions. [2018-11-18 10:42:50,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-18 10:42:50,393 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 296 transitions. [2018-11-18 10:42:50,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2018-11-18 10:42:50,394 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:50,395 INFO L375 BasicCegarLoop]: trace histogram [67, 67, 66, 49, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:50,395 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:50,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:50,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1535210692, now seen corresponding path program 49 times [2018-11-18 10:42:50,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:50,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:50,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:50,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:50,396 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:50,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:51,028 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:51,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:51,029 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:51,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:51,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:51,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:51,029 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:51,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:51,035 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:42:51,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:51,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:51,099 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:51,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:51,696 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-18 10:42:51,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:51,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 52 [2018-11-18 10:42:51,711 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:51,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-18 10:42:51,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-18 10:42:51,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:51,712 INFO L87 Difference]: Start difference. First operand 278 states and 296 transitions. Second operand 52 states. [2018-11-18 10:42:51,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:51,801 INFO L93 Difference]: Finished difference Result 376 states and 413 transitions. [2018-11-18 10:42:51,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-18 10:42:51,802 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 277 [2018-11-18 10:42:51,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:51,803 INFO L225 Difference]: With dead ends: 376 [2018-11-18 10:42:51,803 INFO L226 Difference]: Without dead ends: 298 [2018-11-18 10:42:51,803 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 505 SyntacticMatches, 50 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 10:42:51,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2018-11-18 10:42:51,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 282. [2018-11-18 10:42:51,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-11-18 10:42:51,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 300 transitions. [2018-11-18 10:42:51,823 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 300 transitions. Word has length 277 [2018-11-18 10:42:51,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:51,823 INFO L480 AbstractCegarLoop]: Abstraction has 282 states and 300 transitions. [2018-11-18 10:42:51,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-18 10:42:51,823 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 300 transitions. [2018-11-18 10:42:51,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2018-11-18 10:42:51,824 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:51,825 INFO L375 BasicCegarLoop]: trace histogram [68, 68, 67, 50, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:51,825 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:51,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:51,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1870443506, now seen corresponding path program 50 times [2018-11-18 10:42:51,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:51,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:51,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:42:51,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:51,826 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:51,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:52,541 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 7852 proven. 1191 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2018-11-18 10:42:52,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:52,541 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:52,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:52,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:52,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:52,541 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:52,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 10:42:52,550 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 10:42:52,601 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-11-18 10:42:52,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:52,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:52,632 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 5869 proven. 1191 refuted. 0 times theorem prover too weak. 2052 trivial. 0 not checked. [2018-11-18 10:42:52,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:52,846 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 5869 proven. 1191 refuted. 0 times theorem prover too weak. 2052 trivial. 0 not checked. [2018-11-18 10:42:52,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:52,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 21, 21] total 53 [2018-11-18 10:42:52,871 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:52,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-18 10:42:52,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-18 10:42:52,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-18 10:42:52,872 INFO L87 Difference]: Start difference. First operand 282 states and 300 transitions. Second operand 53 states. [2018-11-18 10:42:53,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:42:53,585 INFO L93 Difference]: Finished difference Result 2696 states and 3340 transitions. [2018-11-18 10:42:53,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-18 10:42:53,586 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 281 [2018-11-18 10:42:53,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:42:53,593 INFO L225 Difference]: With dead ends: 2696 [2018-11-18 10:42:53,593 INFO L226 Difference]: Without dead ends: 2691 [2018-11-18 10:42:53,594 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 545 SyntacticMatches, 36 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1476 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-18 10:42:53,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2691 states. [2018-11-18 10:42:53,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2691 to 414. [2018-11-18 10:42:53,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2018-11-18 10:42:53,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 465 transitions. [2018-11-18 10:42:53,714 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 465 transitions. Word has length 281 [2018-11-18 10:42:53,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:42:53,714 INFO L480 AbstractCegarLoop]: Abstraction has 414 states and 465 transitions. [2018-11-18 10:42:53,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-18 10:42:53,714 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 465 transitions. [2018-11-18 10:42:53,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2018-11-18 10:42:53,716 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:42:53,716 INFO L375 BasicCegarLoop]: trace histogram [101, 101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:42:53,716 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:42:53,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:42:53,716 INFO L82 PathProgramCache]: Analyzing trace with hash 2099862750, now seen corresponding path program 51 times [2018-11-18 10:42:53,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:42:53,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:53,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:42:53,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:42:53,717 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:42:53,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:42:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-11-18 10:42:54,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:54,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:42:54,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:42:54,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:42:54,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:42:54,822 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:42:54,827 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 10:42:54,828 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 10:42:54,880 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 10:42:54,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 10:42:54,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:42:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 0 proven. 20200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 10:42:56,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:42:57,286 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 0 proven. 20200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 10:42:57,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:42:57,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 105, 105] total 109 [2018-11-18 10:42:57,301 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:42:57,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-11-18 10:42:57,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-11-18 10:42:57,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=11453, Unknown=0, NotChecked=0, Total=11772 [2018-11-18 10:42:57,302 INFO L87 Difference]: Start difference. First operand 414 states and 465 transitions. Second operand 107 states. [2018-11-18 10:43:03,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:43:03,939 INFO L93 Difference]: Finished difference Result 5829 states and 7257 transitions. [2018-11-18 10:43:03,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-11-18 10:43:03,940 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 413 [2018-11-18 10:43:03,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:43:03,949 INFO L225 Difference]: With dead ends: 5829 [2018-11-18 10:43:03,949 INFO L226 Difference]: Without dead ends: 5616 [2018-11-18 10:43:03,951 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 771 SyntacticMatches, 4 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=325, Invalid=11665, Unknown=0, NotChecked=0, Total=11990 [2018-11-18 10:43:03,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5616 states. [2018-11-18 10:43:06,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5616 to 5567. [2018-11-18 10:43:06,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5567 states. [2018-11-18 10:43:06,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5567 states to 5567 states and 5667 transitions. [2018-11-18 10:43:06,642 INFO L78 Accepts]: Start accepts. Automaton has 5567 states and 5667 transitions. Word has length 413 [2018-11-18 10:43:06,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:43:06,642 INFO L480 AbstractCegarLoop]: Abstraction has 5567 states and 5667 transitions. [2018-11-18 10:43:06,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-11-18 10:43:06,642 INFO L276 IsEmpty]: Start isEmpty. Operand 5567 states and 5667 transitions. [2018-11-18 10:43:06,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 418 [2018-11-18 10:43:06,644 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 10:43:06,644 INFO L375 BasicCegarLoop]: trace histogram [102, 102, 101, 52, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 10:43:06,645 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 10:43:06,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 10:43:06,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1583456842, now seen corresponding path program 52 times [2018-11-18 10:43:06,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 10:43:06,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:43:06,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 10:43:06,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 10:43:06,646 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 10:43:06,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:43:07,508 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-11-18 10:43:07,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:43:07,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 10:43:07,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 10:43:07,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 10:43:07,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 10:43:07,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 10:43:07,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 10:43:07,516 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 10:43:07,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 10:43:07,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 10:43:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-11-18 10:43:07,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 10:43:08,894 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-11-18 10:43:08,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 10:43:08,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 54 [2018-11-18 10:43:08,909 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 10:43:08,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-18 10:43:08,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-18 10:43:08,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-18 10:43:08,910 INFO L87 Difference]: Start difference. First operand 5567 states and 5667 transitions. Second operand 54 states. [2018-11-18 10:43:09,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 10:43:09,355 INFO L93 Difference]: Finished difference Result 5768 states and 5868 transitions. [2018-11-18 10:43:09,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-18 10:43:09,356 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 417 [2018-11-18 10:43:09,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 10:43:09,357 INFO L225 Difference]: With dead ends: 5768 [2018-11-18 10:43:09,357 INFO L226 Difference]: Without dead ends: 0 [2018-11-18 10:43:09,362 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 783 SyntacticMatches, 102 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2950 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-18 10:43:09,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-18 10:43:09,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-18 10:43:09,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-18 10:43:09,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-18 10:43:09,362 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 417 [2018-11-18 10:43:09,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 10:43:09,362 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-18 10:43:09,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-18 10:43:09,362 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-18 10:43:09,363 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-18 10:43:09,366 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-18 10:43:12,504 WARN L180 SmtUtils]: Spent 3.13 s on a formula simplification. DAG size of input: 1559 DAG size of output: 1042 [2018-11-18 10:43:16,025 WARN L180 SmtUtils]: Spent 3.49 s on a formula simplification. DAG size of input: 887 DAG size of output: 459 [2018-11-18 10:43:16,032 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-18 10:43:16,032 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-18 10:43:16,032 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-18 10:43:16,032 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-18 10:43:16,032 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-18 10:43:16,032 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 25) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point L15(lines 15 19) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point L15-2(lines 14 22) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 25) no Hoare annotation was computed. [2018-11-18 10:43:16,033 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 25) the Hoare annotation is: true [2018-11-18 10:43:16,033 INFO L425 ceAbstractionStarter]: For program point L14-1(lines 14 22) no Hoare annotation was computed. [2018-11-18 10:43:16,034 INFO L421 ceAbstractionStarter]: At program point L14-3(lines 14 22) the Hoare annotation is: (let ((.cse13 (<= main_~y~0 40)) (.cse12 (<= 40 main_~y~0)) (.cse28 (<= 31 main_~y~0)) (.cse29 (<= main_~y~0 31)) (.cse23 (<= 28 main_~y~0)) (.cse22 (<= main_~y~0 28)) (.cse8 (<= main_~y~0 6)) (.cse9 (<= 6 main_~y~0)) (.cse3 (<= main_~y~0 15)) (.cse2 (<= 15 main_~y~0)) (.cse32 (<= main_~y~0 36)) (.cse33 (<= 36 main_~y~0)) (.cse42 (<= main_~y~0 13)) (.cse43 (<= 13 main_~y~0)) (.cse30 (<= 8 main_~y~0)) (.cse31 (<= main_~y~0 8)) (.cse16 (<= 44 main_~y~0)) (.cse17 (<= main_~y~0 44)) (.cse18 (<= 37 main_~y~0)) (.cse19 (<= main_~y~0 37)) (.cse36 (<= 0 main_~y~0)) (.cse37 (<= main_~y~0 0)) (.cse20 (<= main_~y~0 4)) (.cse21 (<= 4 main_~y~0)) (.cse45 (<= 47 main_~y~0)) (.cse44 (<= main_~y~0 47)) (.cse55 (<= 48 main_~y~0)) (.cse54 (<= main_~y~0 48)) (.cse70 (<= 25 main_~y~0)) (.cse71 (<= main_~y~0 25)) (.cse40 (<= main_~y~0 10)) (.cse41 (<= 10 main_~y~0)) (.cse67 (<= 26 main_~y~0)) (.cse66 (<= main_~y~0 26)) (.cse68 (<= 35 main_~y~0)) (.cse69 (<= main_~y~0 35)) (.cse48 (<= main_~y~0 16)) (.cse49 (<= 16 main_~y~0)) (.cse63 (<= main_~y~0 32)) (.cse62 (<= 32 main_~y~0)) (.cse50 (<= main_~y~0 21)) (.cse51 (<= 21 main_~y~0)) (.cse34 (<= main_~y~0 45)) (.cse35 (<= 45 main_~y~0)) (.cse52 (<= 38 main_~y~0)) (.cse53 (<= main_~y~0 38)) (.cse76 (<= main_~y~0 9)) (.cse77 (<= 9 main_~y~0)) (.cse78 (<= main_~y~0 3)) (.cse79 (<= 3 main_~y~0)) (.cse38 (<= 30 main_~y~0)) (.cse39 (<= main_~y~0 30)) (.cse82 (<= main_~y~0 42)) (.cse83 (<= 42 main_~y~0)) (.cse15 (<= main_~y~0 14)) (.cse14 (<= 14 main_~y~0)) (.cse4 (<= 46 main_~y~0)) (.cse5 (<= main_~y~0 46)) (.cse0 (<= main_~y~0 2)) (.cse1 (<= 2 main_~y~0)) (.cse64 (<= main_~y~0 12)) (.cse65 (<= 12 main_~y~0)) (.cse58 (<= 19 main_~y~0)) (.cse59 (<= main_~y~0 19)) (.cse75 (<= main_~y~0 24)) (.cse74 (<= 24 main_~y~0)) (.cse88 (<= 22 main_~y~0)) (.cse89 (<= main_~y~0 22)) (.cse57 (<= 11 main_~y~0)) (.cse56 (<= main_~y~0 11)) (.cse25 (<= 17 main_~y~0)) (.cse24 (<= main_~y~0 17)) (.cse90 (<= 34 main_~y~0)) (.cse91 (<= main_~y~0 34)) (.cse84 (<= main_~y~0 41)) (.cse85 (<= 41 main_~y~0)) (.cse81 (<= main_~y~0 27)) (.cse80 (<= 27 main_~y~0)) (.cse6 (<= 1 main_~y~0)) (.cse7 (<= main_~y~0 1)) (.cse26 (<= 33 main_~y~0)) (.cse27 (<= main_~y~0 33)) (.cse87 (<= 5 main_~y~0)) (.cse86 (<= main_~y~0 5)) (.cse46 (<= 23 main_~y~0)) (.cse47 (<= main_~y~0 23)) (.cse73 (<= 29 main_~y~0)) (.cse72 (<= main_~y~0 29)) (.cse60 (<= main_~y~0 7)) (.cse61 (<= 7 main_~y~0)) (.cse96 (<= 43 main_~y~0)) (.cse97 (<= main_~y~0 43)) (.cse92 (<= 18 main_~y~0)) (.cse93 (<= main_~y~0 18)) (.cse94 (<= 20 main_~y~0)) (.cse95 (<= main_~y~0 20)) (.cse10 (<= 49 main_~y~0)) (.cse11 (<= main_~y~0 49)) (.cse99 (<= 39 main_~y~0)) (.cse98 (<= main_~y~0 39))) (or (and (= main_~x~0 2) .cse0 .cse1) (and .cse2 .cse3 (= main_~x~0 15)) (and (= main_~x~0 46) .cse4 .cse5) (and (<= main_~x~0 99) .cse6 .cse7 (<= 99 main_~x~0)) (and (<= 94 main_~x~0) .cse8 (<= main_~x~0 94) .cse9) (and .cse10 (<= main_~x~0 51) (<= 51 main_~x~0) .cse11) (and (= main_~x~0 40) .cse12 .cse13) (and .cse14 (<= main_~x~0 86) .cse15 (<= 86 main_~x~0)) (and .cse16 (<= main_~x~0 56) .cse17 (<= 56 main_~x~0)) (and (<= 50 main_~x~0) (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and .cse13 (<= main_~x~0 60) (<= 60 main_~x~0) .cse12) (and (= main_~x~0 37) .cse18 .cse19) (and .cse20 .cse21 (= main_~x~0 4)) (and .cse22 (<= 72 main_~x~0) .cse23 (<= main_~x~0 72)) (and .cse24 (<= 83 main_~x~0) (<= main_~x~0 83) .cse25) (and .cse26 (= main_~x~0 33) .cse27) (and .cse28 (<= main_~x~0 69) (<= 69 main_~x~0) .cse29) (and (= main_~x~0 31) .cse28 .cse29) (and (= main_~x~0 8) .cse30 .cse31) (and .cse23 .cse22 (= main_~x~0 28)) (and (= main_~x~0 6) .cse8 .cse9) (and .cse32 .cse33 (= main_~x~0 36)) (and .cse34 (<= main_~x~0 55) (<= 55 main_~x~0) .cse35) (and (= main_~x~0 0) .cse36 .cse37) (and (= main_~x~0 30) .cse38 .cse39) (and .cse40 .cse41 (<= 90 main_~x~0) (<= main_~x~0 90)) (and .cse3 (<= main_~x~0 85) (<= 85 main_~x~0) .cse2) (and .cse42 (<= main_~x~0 87) (<= 87 main_~x~0) .cse43) (and .cse44 (<= 53 main_~x~0) (<= main_~x~0 53) .cse45) (and (<= main_~x~0 64) .cse32 (<= 64 main_~x~0) .cse33) (and (= main_~x~0 13) .cse42 .cse43) (and .cse46 .cse47 (<= 77 main_~x~0) (<= main_~x~0 77)) (and .cse48 .cse49 (= main_~x~0 16)) (and (<= main_~x~0 92) .cse30 .cse31 (<= 92 main_~x~0)) (and (= main_~x~0 44) .cse16 .cse17) (and (<= 63 main_~x~0) .cse18 (<= main_~x~0 63) .cse19) (and (<= main_~x~0 100) .cse36 (<= 100 main_~x~0) .cse37) (and .cse50 .cse51 (= main_~x~0 21)) (and (<= 62 main_~x~0) .cse52 (<= main_~x~0 62) .cse53) (and .cse54 .cse55 (= main_~x~0 48)) (and .cse56 .cse57 (<= 89 main_~x~0) (<= main_~x~0 89)) (and .cse20 .cse21 (<= main_~x~0 96) (<= 96 main_~x~0)) (and .cse58 (= main_~x~0 19) .cse59) (and (<= 93 main_~x~0) .cse60 (<= main_~x~0 93) .cse61) (and (<= 68 main_~x~0) .cse62 (<= main_~x~0 68) .cse63) (and (= main_~x~0 47) .cse45 .cse44) (and (<= main_~x~0 88) (<= 88 main_~x~0) .cse64 .cse65) (and .cse55 .cse54 (<= main_~x~0 52) (<= 52 main_~x~0)) (and (<= 74 main_~x~0) (<= main_~x~0 74) .cse66 .cse67) (and .cse68 .cse69 (<= 65 main_~x~0) (<= main_~x~0 65)) (and .cse70 (<= main_~x~0 75) (<= 75 main_~x~0) .cse71) (and .cse72 .cse73 (= main_~x~0 29)) (and .cse74 .cse75 (= main_~x~0 24)) (and (= main_~x~0 25) .cse70 .cse71) (and .cse40 .cse41 (= main_~x~0 10)) (and (= main_~x~0 26) .cse67 .cse66) (and .cse68 (= main_~x~0 35) .cse69) (and .cse48 (<= 84 main_~x~0) .cse49 (<= main_~x~0 84)) (and .cse63 .cse62 (= main_~x~0 32)) (and (<= main_~x~0 91) (<= 91 main_~x~0) .cse76 .cse77) (and (<= 97 main_~x~0) .cse78 .cse79 (<= main_~x~0 97)) (and .cse80 (<= main_~x~0 73) (<= 73 main_~x~0) .cse81) (and .cse50 (<= main_~x~0 79) (<= 79 main_~x~0) .cse51) (and .cse34 .cse35 (= main_~x~0 45)) (and .cse82 .cse83 (= main_~x~0 42)) (and .cse84 .cse85 (<= 59 main_~x~0) (<= main_~x~0 59)) (and (<= main_~x~0 95) .cse86 .cse87 (<= 95 main_~x~0)) (and .cse52 (= main_~x~0 38) .cse53) (and (= main_~x~0 9) .cse76 .cse77) (and .cse78 .cse79 (= main_~x~0 3)) (and (= main_~x~0 22) .cse88 .cse89) (and (= main_~x~0 34) .cse90 .cse91) (and (<= main_~x~0 70) .cse38 .cse39 (<= 70 main_~x~0)) (and (<= 58 main_~x~0) .cse82 (<= main_~x~0 58) .cse83) (and .cse15 (= main_~x~0 14) .cse14) (and (<= 54 main_~x~0) .cse4 (<= main_~x~0 54) .cse5) (and .cse92 .cse93 (<= 82 main_~x~0) (<= main_~x~0 82)) (and .cse0 (<= main_~x~0 98) .cse1 (<= 98 main_~x~0)) (and .cse64 .cse65 (= main_~x~0 12)) (and (<= main_~x~0 81) .cse58 (<= 81 main_~x~0) .cse59) (and .cse75 (<= 76 main_~x~0) (<= main_~x~0 76) .cse74) (and (<= main_~x~0 78) .cse88 .cse89 (<= 78 main_~x~0)) (and (= main_~x~0 20) .cse94 .cse95) (and .cse57 .cse56 (= main_~x~0 11)) (and .cse25 (= main_~x~0 17) .cse24) (and .cse90 .cse91 (<= 66 main_~x~0) (<= main_~x~0 66)) (and .cse84 (= main_~x~0 41) .cse85) (and (= main_~x~0 27) .cse81 .cse80) (and (= main_~x~0 1) .cse6 .cse7) (and .cse26 .cse27 (<= 67 main_~x~0) (<= main_~x~0 67)) (and (<= 57 main_~x~0) .cse96 (<= main_~x~0 57) .cse97) (and .cse87 (= main_~x~0 5) .cse86) (and .cse46 (= main_~x~0 23) .cse47) (and .cse73 .cse72 (<= 71 main_~x~0) (<= main_~x~0 71)) (and (= main_~x~0 7) .cse60 .cse61) (and (= main_~x~0 43) .cse96 .cse97) (and .cse92 (= main_~x~0 18) .cse93) (and .cse98 (= main_~x~0 39) .cse99) (and .cse94 (<= 80 main_~x~0) (<= main_~x~0 80) .cse95) (and .cse10 (= main_~x~0 49) .cse11) (and (<= 61 main_~x~0) .cse99 .cse98 (<= main_~x~0 61)))) [2018-11-18 10:43:16,034 INFO L421 ceAbstractionStarter]: At program point L14-4(lines 14 22) the Hoare annotation is: (and (<= main_~x~0 100) (<= 100 main_~x~0)) [2018-11-18 10:43:16,035 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-11-18 10:43:16,035 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-11-18 10:43:16,035 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-11-18 10:43:16,035 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-11-18 10:43:16,035 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-11-18 10:43:16,035 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-11-18 10:43:16,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 10:43:16 BoogieIcfgContainer [2018-11-18 10:43:16,059 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 10:43:16,060 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 10:43:16,060 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 10:43:16,060 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 10:43:16,063 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 10:42:07" (3/4) ... [2018-11-18 10:43:16,070 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-18 10:43:16,075 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-18 10:43:16,075 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-18 10:43:16,075 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-11-18 10:43:16,078 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2018-11-18 10:43:16,078 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2018-11-18 10:43:16,078 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-18 10:43:16,103 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_8fb98d0f-c2ae-49b9-8119-8274f3203251/bin-2019/utaipan/witness.graphml [2018-11-18 10:43:16,104 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 10:43:16,104 INFO L168 Benchmark]: Toolchain (without parser) took 68985.28 ms. Allocated memory was 1.0 GB in the beginning and 1.9 GB in the end (delta: 831.0 MB). Free memory was 958.1 MB in the beginning and 1.1 GB in the end (delta: -101.5 MB). Peak memory consumption was 729.5 MB. Max. memory is 11.5 GB. [2018-11-18 10:43:16,105 INFO L168 Benchmark]: CDTParser took 0.12 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. [2018-11-18 10:43:16,105 INFO L168 Benchmark]: CACSL2BoogieTranslator took 146.19 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 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. [2018-11-18 10:43:16,105 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.32 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. [2018-11-18 10:43:16,105 INFO L168 Benchmark]: Boogie Preprocessor took 15.76 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 10:43:16,106 INFO L168 Benchmark]: RCFGBuilder took 176.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.4 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -187.9 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. [2018-11-18 10:43:16,106 INFO L168 Benchmark]: TraceAbstraction took 68583.63 ms. Allocated memory was 1.2 GB in the beginning and 1.9 GB in the end (delta: 681.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 52.7 MB). Peak memory consumption was 1.1 GB. Max. memory is 11.5 GB. [2018-11-18 10:43:16,106 INFO L168 Benchmark]: Witness Printer took 43.94 ms. Allocated memory is still 1.9 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB. [2018-11-18 10:43:16,108 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 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 146.19 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 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 16.32 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 15.76 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 176.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.4 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -187.9 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 68583.63 ms. Allocated memory was 1.2 GB in the beginning and 1.9 GB in the end (delta: 681.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 52.7 MB). Peak memory consumption was 1.1 GB. Max. memory is 11.5 GB. * Witness Printer took 43.94 ms. Allocated memory is still 1.9 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((x == 2 && y <= 2) && 2 <= y) || ((15 <= y && y <= 15) && x == 15)) || ((x == 46 && 46 <= y) && y <= 46)) || (((x <= 99 && 1 <= y) && y <= 1) && 99 <= x)) || (((94 <= x && y <= 6) && x <= 94) && 6 <= y)) || (((49 <= y && x <= 51) && 51 <= x) && y <= 49)) || ((x == 40 && 40 <= y) && y <= 40)) || (((14 <= y && x <= 86) && y <= 14) && 86 <= x)) || (((44 <= y && x <= 56) && y <= 44) && 56 <= x)) || (((50 <= x && y <= 50) && x <= 50) && 50 <= y)) || (((y <= 40 && x <= 60) && 60 <= x) && 40 <= y)) || ((x == 37 && 37 <= y) && y <= 37)) || ((y <= 4 && 4 <= y) && x == 4)) || (((y <= 28 && 72 <= x) && 28 <= y) && x <= 72)) || (((y <= 17 && 83 <= x) && x <= 83) && 17 <= y)) || ((33 <= y && x == 33) && y <= 33)) || (((31 <= y && x <= 69) && 69 <= x) && y <= 31)) || ((x == 31 && 31 <= y) && y <= 31)) || ((x == 8 && 8 <= y) && y <= 8)) || ((28 <= y && y <= 28) && x == 28)) || ((x == 6 && y <= 6) && 6 <= y)) || ((y <= 36 && 36 <= y) && x == 36)) || (((y <= 45 && x <= 55) && 55 <= x) && 45 <= y)) || ((x == 0 && 0 <= y) && y <= 0)) || ((x == 30 && 30 <= y) && y <= 30)) || (((y <= 10 && 10 <= y) && 90 <= x) && x <= 90)) || (((y <= 15 && x <= 85) && 85 <= x) && 15 <= y)) || (((y <= 13 && x <= 87) && 87 <= x) && 13 <= y)) || (((y <= 47 && 53 <= x) && x <= 53) && 47 <= y)) || (((x <= 64 && y <= 36) && 64 <= x) && 36 <= y)) || ((x == 13 && y <= 13) && 13 <= y)) || (((23 <= y && y <= 23) && 77 <= x) && x <= 77)) || ((y <= 16 && 16 <= y) && x == 16)) || (((x <= 92 && 8 <= y) && y <= 8) && 92 <= x)) || ((x == 44 && 44 <= y) && y <= 44)) || (((63 <= x && 37 <= y) && x <= 63) && y <= 37)) || (((x <= 100 && 0 <= y) && 100 <= x) && y <= 0)) || ((y <= 21 && 21 <= y) && x == 21)) || (((62 <= x && 38 <= y) && x <= 62) && y <= 38)) || ((y <= 48 && 48 <= y) && x == 48)) || (((y <= 11 && 11 <= y) && 89 <= x) && x <= 89)) || (((y <= 4 && 4 <= y) && x <= 96) && 96 <= x)) || ((19 <= y && x == 19) && y <= 19)) || (((93 <= x && y <= 7) && x <= 93) && 7 <= y)) || (((68 <= x && 32 <= y) && x <= 68) && y <= 32)) || ((x == 47 && 47 <= y) && y <= 47)) || (((x <= 88 && 88 <= x) && y <= 12) && 12 <= y)) || (((48 <= y && y <= 48) && x <= 52) && 52 <= x)) || (((74 <= x && x <= 74) && y <= 26) && 26 <= y)) || (((35 <= y && y <= 35) && 65 <= x) && x <= 65)) || (((25 <= y && x <= 75) && 75 <= x) && y <= 25)) || ((y <= 29 && 29 <= y) && x == 29)) || ((24 <= y && y <= 24) && x == 24)) || ((x == 25 && 25 <= y) && y <= 25)) || ((y <= 10 && 10 <= y) && x == 10)) || ((x == 26 && 26 <= y) && y <= 26)) || ((35 <= y && x == 35) && y <= 35)) || (((y <= 16 && 84 <= x) && 16 <= y) && x <= 84)) || ((y <= 32 && 32 <= y) && x == 32)) || (((x <= 91 && 91 <= x) && y <= 9) && 9 <= y)) || (((97 <= x && y <= 3) && 3 <= y) && x <= 97)) || (((27 <= y && x <= 73) && 73 <= x) && y <= 27)) || (((y <= 21 && x <= 79) && 79 <= x) && 21 <= y)) || ((y <= 45 && 45 <= y) && x == 45)) || ((y <= 42 && 42 <= y) && x == 42)) || (((y <= 41 && 41 <= y) && 59 <= x) && x <= 59)) || (((x <= 95 && y <= 5) && 5 <= y) && 95 <= x)) || ((38 <= y && x == 38) && y <= 38)) || ((x == 9 && y <= 9) && 9 <= y)) || ((y <= 3 && 3 <= y) && x == 3)) || ((x == 22 && 22 <= y) && y <= 22)) || ((x == 34 && 34 <= y) && y <= 34)) || (((x <= 70 && 30 <= y) && y <= 30) && 70 <= x)) || (((58 <= x && y <= 42) && x <= 58) && 42 <= y)) || ((y <= 14 && x == 14) && 14 <= y)) || (((54 <= x && 46 <= y) && x <= 54) && y <= 46)) || (((18 <= y && y <= 18) && 82 <= x) && x <= 82)) || (((y <= 2 && x <= 98) && 2 <= y) && 98 <= x)) || ((y <= 12 && 12 <= y) && x == 12)) || (((x <= 81 && 19 <= y) && 81 <= x) && y <= 19)) || (((y <= 24 && 76 <= x) && x <= 76) && 24 <= y)) || (((x <= 78 && 22 <= y) && y <= 22) && 78 <= x)) || ((x == 20 && 20 <= y) && y <= 20)) || ((11 <= y && y <= 11) && x == 11)) || ((17 <= y && x == 17) && y <= 17)) || (((34 <= y && y <= 34) && 66 <= x) && x <= 66)) || ((y <= 41 && x == 41) && 41 <= y)) || ((x == 27 && y <= 27) && 27 <= y)) || ((x == 1 && 1 <= y) && y <= 1)) || (((33 <= y && y <= 33) && 67 <= x) && x <= 67)) || (((57 <= x && 43 <= y) && x <= 57) && y <= 43)) || ((5 <= y && x == 5) && y <= 5)) || ((23 <= y && x == 23) && y <= 23)) || (((29 <= y && y <= 29) && 71 <= x) && x <= 71)) || ((x == 7 && y <= 7) && 7 <= y)) || ((x == 43 && 43 <= y) && y <= 43)) || ((18 <= y && x == 18) && y <= 18)) || ((y <= 39 && x == 39) && 39 <= y)) || (((20 <= y && 80 <= x) && x <= 80) && y <= 20)) || ((49 <= y && x == 49) && y <= 49)) || (((61 <= x && 39 <= y) && y <= 39) && x <= 61) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 68.5s OverallTime, 55 OverallIterations, 102 TraceHistogramMax, 15.7s AutomataDifference, 0.0s DeadEndRemovalTime, 6.6s HoareAnnotationTime, HoareTripleCheckerStatistics: 1402 SDtfs, 1076 SDslu, 36580 SDs, 0 SdLazy, 23932 SolverSat, 1386 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18946 GetRequests, 15418 SyntacticMatches, 896 SemanticMatches, 2632 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45963 ImplicationChecksByTransitivity, 39.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=5567occurred in iteration=54, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 3.2s AutomataMinimizationTime, 55 MinimizatonAttempts, 2951 StatesRemovedByMinimization, 52 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 62 PreInvPairs, 164 NumberOfFragments, 1176 HoareAnnotationTreeSize, 62 FomulaSimplifications, 50095985 FormulaSimplificationTreeSizeReduction, 3.1s HoareSimplificationTime, 7 FomulaSimplificationsInter, 12095 FormulaSimplificationTreeSizeReductionInter, 3.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 1.4s SatisfiabilityAnalysisTime, 38.6s InterpolantComputationTime, 16860 NumberOfCodeBlocks, 16240 NumberOfCodeBlocksAsserted, 564 NumberOfCheckSat, 25113 ConstructedInterpolants, 0 QuantifiedInterpolants, 13916361 SizeOfPredicates, 69 NumberOfNonLiveVariables, 15740 ConjunctsInSsa, 1584 ConjunctsInUnsatCore, 159 InterpolantComputations, 3 PerfectInterpolantSequences, 318092/604248 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...