./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i -s /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UTaipan-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1a9963030a13e3c679db84f21688cc66372a5ac3 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-21 12:38:08,380 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:38:08,382 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:38:08,400 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:38:08,400 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:38:08,404 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:38:08,405 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:38:08,407 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:38:08,409 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:38:08,410 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:38:08,411 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:38:08,411 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:38:08,412 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:38:08,413 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:38:08,414 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:38:08,415 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:38:08,415 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:38:08,417 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:38:08,419 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:38:08,421 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:38:08,422 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:38:08,423 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:38:08,426 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:38:08,426 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:38:08,426 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:38:08,427 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:38:08,428 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:38:08,429 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:38:08,430 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:38:08,433 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:38:08,433 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:38:08,434 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:38:08,434 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:38:08,434 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:38:08,435 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:38:08,436 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:38:08,436 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:38:08,454 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:38:08,455 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:38:08,455 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:38:08,456 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:38:08,456 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:38:08,456 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:38:08,456 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:38:08,456 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:38:08,457 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:38:08,457 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:38:08,457 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:38:08,458 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:38:08,458 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:38:08,458 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:38:08,458 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:38:08,458 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:38:08,458 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:38:08,459 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:38:08,459 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:38:08,459 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:38:08,459 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:38:08,459 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:38:08,459 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:38:08,460 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:38:08,460 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:38:08,460 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:38:08,460 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:38:08,460 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:38:08,461 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:38:08,462 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UTaipan-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a9963030a13e3c679db84f21688cc66372a5ac3 [2018-10-21 12:38:08,517 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:38:08,533 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:38:08,538 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:38:08,540 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:38:08,541 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:38:08,541 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-21 12:38:08,606 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6cecd789/d9184663e21f40ed8debb7fabc4f7384/FLAGa65989b80 [2018-10-21 12:38:09,056 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:38:09,057 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-21 12:38:09,063 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6cecd789/d9184663e21f40ed8debb7fabc4f7384/FLAGa65989b80 [2018-10-21 12:38:09,080 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6cecd789/d9184663e21f40ed8debb7fabc4f7384 [2018-10-21 12:38:09,084 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:38:09,086 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:38:09,087 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:38:09,087 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:38:09,091 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:38:09,092 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,096 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dc0bafc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09, skipping insertion in model container [2018-10-21 12:38:09,096 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,107 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:38:09,131 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:38:09,334 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:38:09,340 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:38:09,358 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:38:09,374 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:38:09,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09 WrapperNode [2018-10-21 12:38:09,375 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:38:09,376 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:38:09,376 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:38:09,376 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:38:09,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,391 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,397 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:38:09,398 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:38:09,398 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:38:09,398 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:38:09,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,409 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,409 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,413 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,420 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,421 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... [2018-10-21 12:38:09,423 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:38:09,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:38:09,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:38:09,423 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:38:09,424 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:38:09,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:38:09,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:38:09,591 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:38:09,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:38:09,591 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:38:09,591 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:38:09,591 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:38:09,592 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:38:09,964 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:38:09,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:38:09 BoogieIcfgContainer [2018-10-21 12:38:09,964 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:38:09,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:38:09,965 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:38:09,970 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:38:09,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:38:09" (1/3) ... [2018-10-21 12:38:09,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@610d1368 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:38:09, skipping insertion in model container [2018-10-21 12:38:09,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:38:09" (2/3) ... [2018-10-21 12:38:09,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@610d1368 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:38:09, skipping insertion in model container [2018-10-21 12:38:09,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:38:09" (3/3) ... [2018-10-21 12:38:09,977 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007_true-unreach-call_true-termination.c.i [2018-10-21 12:38:09,987 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:38:09,999 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:38:10,014 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:38:10,047 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:38:10,048 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:38:10,048 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:38:10,048 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:38:10,048 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:38:10,048 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:38:10,049 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:38:10,049 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:38:10,049 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:38:10,068 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-21 12:38:10,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-21 12:38:10,074 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:10,075 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:10,079 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:10,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:10,086 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2018-10-21 12:38:10,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:10,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:10,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,137 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:10,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:10,193 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:38:10,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:38:10,193 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:38:10,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:38:10,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:38:10,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:38:10,212 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-21 12:38:10,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:10,236 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-21 12:38:10,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:38:10,238 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-21 12:38:10,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:10,247 INFO L225 Difference]: With dead ends: 32 [2018-10-21 12:38:10,247 INFO L226 Difference]: Without dead ends: 13 [2018-10-21 12:38:10,251 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:38:10,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-21 12:38:10,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-21 12:38:10,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-21 12:38:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-21 12:38:10,288 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-21 12:38:10,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:10,289 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-21 12:38:10,289 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:38:10,289 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-21 12:38:10,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:38:10,290 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:10,290 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:10,290 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:10,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:10,291 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-10-21 12:38:10,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:10,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:10,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,293 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:10,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:10,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:10,380 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:38:10,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-21 12:38:10,380 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:38:10,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-21 12:38:10,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-21 12:38:10,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:38:10,384 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-21 12:38:10,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:10,501 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-21 12:38:10,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-21 12:38:10,502 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-21 12:38:10,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:10,503 INFO L225 Difference]: With dead ends: 24 [2018-10-21 12:38:10,503 INFO L226 Difference]: Without dead ends: 16 [2018-10-21 12:38:10,504 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:38:10,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-21 12:38:10,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-21 12:38:10,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-21 12:38:10,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-21 12:38:10,511 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-21 12:38:10,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:10,511 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-21 12:38:10,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-21 12:38:10,512 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-21 12:38:10,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-21 12:38:10,513 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:10,513 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:10,514 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:10,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:10,514 INFO L82 PathProgramCache]: Analyzing trace with hash 64649018, now seen corresponding path program 1 times [2018-10-21 12:38:10,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:10,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:10,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:10,516 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:10,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:10,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:10,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:10,681 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:10,682 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-21 12:38:10,687 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [27], [30], [32], [38], [39], [40], [42] [2018-10-21 12:38:10,744 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:38:10,744 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:38:10,965 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-21 12:38:10,967 INFO L272 AbstractInterpreter]: Visited 9 different actions 41 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-21 12:38:11,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:11,006 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-21 12:38:11,057 INFO L224 lantSequenceWeakener]: Could never weaken! [2018-10-21 12:38:11,057 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-21 12:38:11,075 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-21 12:38:11,076 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-21 12:38:11,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2018-10-21 12:38:11,076 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:38:11,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-21 12:38:11,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-21 12:38:11,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:38:11,078 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 3 states. [2018-10-21 12:38:11,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:11,185 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2018-10-21 12:38:11,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-21 12:38:11,185 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-10-21 12:38:11,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:11,186 INFO L225 Difference]: With dead ends: 24 [2018-10-21 12:38:11,186 INFO L226 Difference]: Without dead ends: 19 [2018-10-21 12:38:11,187 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:38:11,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-21 12:38:11,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-21 12:38:11,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-21 12:38:11,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-21 12:38:11,192 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2018-10-21 12:38:11,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:11,193 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-21 12:38:11,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-21 12:38:11,193 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-21 12:38:11,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-21 12:38:11,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:11,194 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:11,194 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:11,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:11,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1506199393, now seen corresponding path program 1 times [2018-10-21 12:38:11,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:11,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:11,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:11,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:11,197 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:11,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:11,285 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:11,285 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:11,286 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-21 12:38:11,286 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [27], [30], [32], [38], [39], [40], [42] [2018-10-21 12:38:11,288 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:38:11,289 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:38:11,377 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:38:11,377 INFO L272 AbstractInterpreter]: Visited 14 different actions 67 times. Merged at 5 different actions 31 times. Widened at 2 different actions 6 times. Found 4 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-21 12:38:11,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:11,399 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:38:11,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:11,399 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:11,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:11,410 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:11,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:11,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:11,472 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:11,580 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:11,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:11,599 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:11,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:11,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:11,622 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:11,652 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:11,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-21 12:38:11,654 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:11,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:38:11,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:38:11,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:38:11,655 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2018-10-21 12:38:11,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:11,763 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-21 12:38:11,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:38:11,764 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-10-21 12:38:11,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:11,765 INFO L225 Difference]: With dead ends: 30 [2018-10-21 12:38:11,765 INFO L226 Difference]: Without dead ends: 22 [2018-10-21 12:38:11,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:38:11,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-21 12:38:11,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-21 12:38:11,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-21 12:38:11,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-21 12:38:11,773 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2018-10-21 12:38:11,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:11,773 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-21 12:38:11,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:38:11,773 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-21 12:38:11,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-21 12:38:11,774 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:11,774 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:11,774 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:11,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:11,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1748455324, now seen corresponding path program 2 times [2018-10-21 12:38:11,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:11,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:11,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:11,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:11,777 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:11,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:11,915 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:11,916 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:11,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:11,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:11,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:11,916 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:11,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:11,934 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:11,961 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:11,961 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:11,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:11,978 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:11,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:12,051 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:12,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,071 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:12,087 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:12,087 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:12,106 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:12,106 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:12,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:12,115 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:12,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:12,180 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:12,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:12,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-21 12:38:12,182 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:12,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-21 12:38:12,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-21 12:38:12,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:38:12,184 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2018-10-21 12:38:12,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:12,321 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-21 12:38:12,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-21 12:38:12,321 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-21 12:38:12,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:12,322 INFO L225 Difference]: With dead ends: 33 [2018-10-21 12:38:12,323 INFO L226 Difference]: Without dead ends: 25 [2018-10-21 12:38:12,323 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:38:12,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-21 12:38:12,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-21 12:38:12,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-21 12:38:12,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-21 12:38:12,329 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2018-10-21 12:38:12,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:12,329 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-21 12:38:12,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-21 12:38:12,330 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-21 12:38:12,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-21 12:38:12,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:12,331 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:12,331 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:12,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:12,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1045128831, now seen corresponding path program 3 times [2018-10-21 12:38:12,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:12,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:12,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:12,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:12,333 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:12,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:12,403 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:12,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,404 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:12,404 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:12,404 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:12,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,405 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:12,422 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:12,422 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:12,432 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-21 12:38:12,432 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:12,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:12,568 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-21 12:38:12,568 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:12,608 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-21 12:38:12,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,628 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:12,644 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:12,644 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:12,661 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-21 12:38:12,662 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:12,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:12,669 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-21 12:38:12,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:12,702 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-21 12:38:12,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:12,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4, 4, 4] total 10 [2018-10-21 12:38:12,708 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:12,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:38:12,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:38:12,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:38:12,709 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2018-10-21 12:38:12,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:12,790 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2018-10-21 12:38:12,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:38:12,793 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2018-10-21 12:38:12,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:12,794 INFO L225 Difference]: With dead ends: 42 [2018-10-21 12:38:12,794 INFO L226 Difference]: Without dead ends: 34 [2018-10-21 12:38:12,795 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:38:12,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-21 12:38:12,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-21 12:38:12,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-21 12:38:12,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-21 12:38:12,801 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-21 12:38:12,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:12,802 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-21 12:38:12,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:38:12,802 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-21 12:38:12,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-21 12:38:12,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:12,803 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:12,803 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:12,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:12,804 INFO L82 PathProgramCache]: Analyzing trace with hash 634861023, now seen corresponding path program 4 times [2018-10-21 12:38:12,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:12,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:12,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:12,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:12,805 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:12,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:12,890 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:12,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,891 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:12,891 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:12,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:12,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:12,892 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:12,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:12,905 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:12,916 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:12,916 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:12,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:12,933 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:12,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:13,324 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:13,344 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:13,360 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:13,361 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:13,379 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:13,379 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:13,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:13,390 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:13,410 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:13,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-21 12:38:13,411 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:13,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-21 12:38:13,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-21 12:38:13,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-21 12:38:13,413 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 7 states. [2018-10-21 12:38:13,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:13,464 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-21 12:38:13,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:38:13,465 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2018-10-21 12:38:13,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:13,466 INFO L225 Difference]: With dead ends: 46 [2018-10-21 12:38:13,466 INFO L226 Difference]: Without dead ends: 33 [2018-10-21 12:38:13,467 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-21 12:38:13,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-21 12:38:13,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-21 12:38:13,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-21 12:38:13,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-21 12:38:13,473 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-21 12:38:13,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:13,474 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-21 12:38:13,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-21 12:38:13,474 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-21 12:38:13,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-21 12:38:13,475 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:13,475 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:13,475 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:13,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:13,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1611776614, now seen corresponding path program 5 times [2018-10-21 12:38:13,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:13,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:13,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:13,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:13,477 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:13,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:13,690 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:13,691 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:13,691 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:13,693 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:13,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:13,693 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:13,701 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:13,701 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:13,723 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-21 12:38:13,724 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:13,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:13,916 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:13,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:13,936 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:13,953 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:13,953 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:13,991 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-21 12:38:13,991 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:13,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:14,001 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:14,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:14,038 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:14,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:14,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-21 12:38:14,041 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:14,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:38:14,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:38:14,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-21 12:38:14,042 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 8 states. [2018-10-21 12:38:14,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:14,153 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-21 12:38:14,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:38:14,154 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2018-10-21 12:38:14,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:14,155 INFO L225 Difference]: With dead ends: 49 [2018-10-21 12:38:14,155 INFO L226 Difference]: Without dead ends: 36 [2018-10-21 12:38:14,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-21 12:38:14,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-21 12:38:14,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-21 12:38:14,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-21 12:38:14,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-21 12:38:14,161 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-21 12:38:14,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:14,162 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-21 12:38:14,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:38:14,162 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-21 12:38:14,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-21 12:38:14,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:14,163 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:14,163 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:14,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:14,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1576720383, now seen corresponding path program 6 times [2018-10-21 12:38:14,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:14,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:14,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:14,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:14,165 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:14,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:14,246 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-21 12:38:14,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:14,247 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:14,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:14,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:14,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:14,247 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:14,255 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:14,255 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:14,309 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-21 12:38:14,309 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:14,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:14,551 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:14,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:14,855 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:14,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:14,875 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:14,908 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:14,908 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:14,954 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-21 12:38:14,955 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:14,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:14,965 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:14,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:14,990 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:38:14,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:14,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10, 10, 10] total 25 [2018-10-21 12:38:14,992 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:14,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-21 12:38:14,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-21 12:38:14,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-21 12:38:14,993 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 17 states. [2018-10-21 12:38:15,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:15,231 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2018-10-21 12:38:15,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-21 12:38:15,232 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-21 12:38:15,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:15,235 INFO L225 Difference]: With dead ends: 71 [2018-10-21 12:38:15,235 INFO L226 Difference]: Without dead ends: 58 [2018-10-21 12:38:15,235 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-21 12:38:15,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-21 12:38:15,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-21 12:38:15,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-21 12:38:15,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2018-10-21 12:38:15,244 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 35 [2018-10-21 12:38:15,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:15,244 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2018-10-21 12:38:15,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-21 12:38:15,245 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2018-10-21 12:38:15,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-21 12:38:15,246 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:15,246 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:15,246 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:15,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:15,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1775771482, now seen corresponding path program 7 times [2018-10-21 12:38:15,247 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:15,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:15,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:15,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:15,248 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:15,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:15,457 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:15,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:15,457 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:15,457 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:15,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:15,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:15,458 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:15,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:15,467 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:15,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:15,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:15,497 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:15,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:15,653 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:15,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:15,674 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:15,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:15,689 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:15,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:15,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:15,739 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:15,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:15,804 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:15,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:15,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-21 12:38:15,810 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:15,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-21 12:38:15,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-21 12:38:15,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:38:15,812 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand 10 states. [2018-10-21 12:38:15,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:15,913 INFO L93 Difference]: Finished difference Result 91 states and 108 transitions. [2018-10-21 12:38:15,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-21 12:38:15,921 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 56 [2018-10-21 12:38:15,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:15,922 INFO L225 Difference]: With dead ends: 91 [2018-10-21 12:38:15,922 INFO L226 Difference]: Without dead ends: 60 [2018-10-21 12:38:15,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:38:15,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-21 12:38:15,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-21 12:38:15,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-21 12:38:15,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2018-10-21 12:38:15,932 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 56 [2018-10-21 12:38:15,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:15,933 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2018-10-21 12:38:15,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-21 12:38:15,933 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2018-10-21 12:38:15,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-21 12:38:15,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:15,936 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:15,936 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:15,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:15,936 INFO L82 PathProgramCache]: Analyzing trace with hash -112911681, now seen corresponding path program 8 times [2018-10-21 12:38:15,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:15,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:15,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:15,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:15,937 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:16,084 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:16,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:16,085 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:16,085 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:16,085 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:16,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:16,085 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:16,097 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:16,097 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:16,120 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:16,121 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:16,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:16,129 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:16,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:16,282 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:16,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:16,302 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:16,320 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:16,321 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:16,352 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:16,352 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:16,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:16,365 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:16,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:16,392 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (17)] Exception during sending of exit command (exit): Broken pipe [2018-10-21 12:38:16,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:16,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-21 12:38:16,394 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:16,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-21 12:38:16,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-21 12:38:16,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-21 12:38:16,395 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand 11 states. [2018-10-21 12:38:16,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:16,457 INFO L93 Difference]: Finished difference Result 94 states and 111 transitions. [2018-10-21 12:38:16,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-21 12:38:16,457 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 59 [2018-10-21 12:38:16,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:16,458 INFO L225 Difference]: With dead ends: 94 [2018-10-21 12:38:16,459 INFO L226 Difference]: Without dead ends: 63 [2018-10-21 12:38:16,459 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-21 12:38:16,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-21 12:38:16,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-21 12:38:16,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-21 12:38:16,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2018-10-21 12:38:16,473 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 59 [2018-10-21 12:38:16,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:16,473 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2018-10-21 12:38:16,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-21 12:38:16,473 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2018-10-21 12:38:16,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-21 12:38:16,477 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:16,477 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:16,478 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:16,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:16,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1801443014, now seen corresponding path program 9 times [2018-10-21 12:38:16,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:16,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:16,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:16,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:16,481 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:16,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:17,001 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 230 proven. 135 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-21 12:38:17,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:17,001 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:17,001 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:17,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:17,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:17,002 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:17,012 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:17,012 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:17,043 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-21 12:38:17,043 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:17,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:17,519 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-21 12:38:17,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:17,908 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-21 12:38:17,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:17,928 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:17,948 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:17,948 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:18,035 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-21 12:38:18,035 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:18,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:18,047 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-21 12:38:18,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:18,102 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-21 12:38:18,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:18,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11, 11, 11] total 30 [2018-10-21 12:38:18,106 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:18,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-21 12:38:18,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-21 12:38:18,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-21 12:38:18,108 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand 21 states. [2018-10-21 12:38:18,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:18,285 INFO L93 Difference]: Finished difference Result 101 states and 121 transitions. [2018-10-21 12:38:18,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-21 12:38:18,286 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 62 [2018-10-21 12:38:18,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:18,288 INFO L225 Difference]: With dead ends: 101 [2018-10-21 12:38:18,288 INFO L226 Difference]: Without dead ends: 70 [2018-10-21 12:38:18,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-21 12:38:18,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-21 12:38:18,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-21 12:38:18,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-21 12:38:18,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2018-10-21 12:38:18,298 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 62 [2018-10-21 12:38:18,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:18,298 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2018-10-21 12:38:18,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-21 12:38:18,299 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2018-10-21 12:38:18,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-21 12:38:18,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:18,300 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:18,300 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:18,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:18,300 INFO L82 PathProgramCache]: Analyzing trace with hash 348314524, now seen corresponding path program 10 times [2018-10-21 12:38:18,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:18,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:18,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:18,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:18,302 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:18,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:18,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:18,447 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:18,447 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:18,447 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:18,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:18,448 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:18,458 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:18,458 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:18,478 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:18,478 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:18,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:18,492 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:18,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:18,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:18,829 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:18,847 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:18,847 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:18,890 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:18,890 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:18,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:18,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:18,965 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:18,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:18,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-21 12:38:18,972 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:18,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-21 12:38:18,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-21 12:38:18,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-21 12:38:18,973 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand 13 states. [2018-10-21 12:38:19,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:19,062 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2018-10-21 12:38:19,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-21 12:38:19,064 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2018-10-21 12:38:19,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:19,065 INFO L225 Difference]: With dead ends: 106 [2018-10-21 12:38:19,065 INFO L226 Difference]: Without dead ends: 72 [2018-10-21 12:38:19,066 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-21 12:38:19,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-21 12:38:19,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-21 12:38:19,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-21 12:38:19,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2018-10-21 12:38:19,076 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 68 [2018-10-21 12:38:19,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:19,076 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2018-10-21 12:38:19,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-21 12:38:19,076 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2018-10-21 12:38:19,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-21 12:38:19,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:19,078 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:19,078 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:19,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:19,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1933633409, now seen corresponding path program 11 times [2018-10-21 12:38:19,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:19,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:19,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:19,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:19,079 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:19,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:19,367 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:19,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:19,367 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:19,368 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:19,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:19,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:19,368 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:19,376 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:19,377 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:19,444 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-21 12:38:19,445 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:19,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:19,459 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:19,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:19,747 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:19,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:19,767 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:19,782 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:19,782 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:19,912 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-21 12:38:19,913 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:19,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:19,925 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:19,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:19,940 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:19,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:19,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-21 12:38:19,942 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:19,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-21 12:38:19,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-21 12:38:19,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-21 12:38:19,943 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand 14 states. [2018-10-21 12:38:20,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:20,018 INFO L93 Difference]: Finished difference Result 109 states and 128 transitions. [2018-10-21 12:38:20,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-21 12:38:20,019 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2018-10-21 12:38:20,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:20,020 INFO L225 Difference]: With dead ends: 109 [2018-10-21 12:38:20,020 INFO L226 Difference]: Without dead ends: 75 [2018-10-21 12:38:20,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-21 12:38:20,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-21 12:38:20,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-10-21 12:38:20,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-21 12:38:20,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2018-10-21 12:38:20,028 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 71 [2018-10-21 12:38:20,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:20,029 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2018-10-21 12:38:20,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-21 12:38:20,029 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2018-10-21 12:38:20,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-21 12:38:20,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:20,030 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:20,030 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:20,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:20,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1586817668, now seen corresponding path program 12 times [2018-10-21 12:38:20,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:20,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:20,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:20,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:20,031 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:20,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:20,216 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:20,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:20,217 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:20,217 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:20,217 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:20,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:20,217 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:20,226 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:20,226 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:20,257 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-21 12:38:20,257 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:20,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:20,270 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:20,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:20,539 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:20,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:20,561 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:20,577 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:20,577 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:20,719 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-21 12:38:20,719 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:20,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:20,732 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:20,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:20,785 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:20,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:20,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-21 12:38:20,788 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:20,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-21 12:38:20,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-21 12:38:20,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-21 12:38:20,790 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand 15 states. [2018-10-21 12:38:20,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:20,980 INFO L93 Difference]: Finished difference Result 112 states and 131 transitions. [2018-10-21 12:38:20,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-21 12:38:20,982 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 74 [2018-10-21 12:38:20,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:20,983 INFO L225 Difference]: With dead ends: 112 [2018-10-21 12:38:20,983 INFO L226 Difference]: Without dead ends: 78 [2018-10-21 12:38:20,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-21 12:38:20,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-21 12:38:20,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-21 12:38:20,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-21 12:38:20,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 87 transitions. [2018-10-21 12:38:20,990 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 87 transitions. Word has length 74 [2018-10-21 12:38:20,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:20,991 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 87 transitions. [2018-10-21 12:38:20,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-21 12:38:20,991 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 87 transitions. [2018-10-21 12:38:20,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-21 12:38:20,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:20,992 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:20,992 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:20,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:20,992 INFO L82 PathProgramCache]: Analyzing trace with hash -538451551, now seen corresponding path program 13 times [2018-10-21 12:38:20,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:20,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:20,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:20,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:20,994 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:21,186 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:21,186 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:21,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:21,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:21,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:21,187 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:21,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:21,196 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:21,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:21,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:21,226 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:21,597 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:21,617 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:21,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:21,633 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:21,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:21,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:21,683 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:21,699 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:21,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-21 12:38:21,701 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:21,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-21 12:38:21,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-21 12:38:21,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-21 12:38:21,702 INFO L87 Difference]: Start difference. First operand 78 states and 87 transitions. Second operand 16 states. [2018-10-21 12:38:21,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:21,775 INFO L93 Difference]: Finished difference Result 115 states and 134 transitions. [2018-10-21 12:38:21,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-21 12:38:21,777 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 77 [2018-10-21 12:38:21,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:21,778 INFO L225 Difference]: With dead ends: 115 [2018-10-21 12:38:21,778 INFO L226 Difference]: Without dead ends: 81 [2018-10-21 12:38:21,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-21 12:38:21,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-21 12:38:21,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-10-21 12:38:21,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-21 12:38:21,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2018-10-21 12:38:21,785 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 77 [2018-10-21 12:38:21,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:21,786 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2018-10-21 12:38:21,786 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-21 12:38:21,786 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2018-10-21 12:38:21,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-21 12:38:21,787 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:21,787 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:21,787 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:21,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:21,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1665636516, now seen corresponding path program 14 times [2018-10-21 12:38:21,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:21,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:21,789 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:21,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:21,789 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:21,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:21,982 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:21,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:21,982 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:21,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:21,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:21,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:21,983 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:21,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:21,994 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:22,010 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:22,011 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:22,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:22,022 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:22,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:22,331 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:22,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:22,351 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:22,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:22,369 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:22,415 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:22,415 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:22,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:22,427 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:22,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:22,443 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:22,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:22,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-21 12:38:22,444 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:22,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-21 12:38:22,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-21 12:38:22,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-21 12:38:22,445 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand 17 states. [2018-10-21 12:38:22,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:22,533 INFO L93 Difference]: Finished difference Result 118 states and 137 transitions. [2018-10-21 12:38:22,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-21 12:38:22,535 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 80 [2018-10-21 12:38:22,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:22,538 INFO L225 Difference]: With dead ends: 118 [2018-10-21 12:38:22,538 INFO L226 Difference]: Without dead ends: 84 [2018-10-21 12:38:22,539 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-21 12:38:22,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-21 12:38:22,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-21 12:38:22,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-21 12:38:22,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-10-21 12:38:22,550 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 80 [2018-10-21 12:38:22,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:22,550 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-10-21 12:38:22,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-21 12:38:22,550 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-10-21 12:38:22,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-21 12:38:22,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:22,558 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:22,559 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:22,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:22,559 INFO L82 PathProgramCache]: Analyzing trace with hash 716358593, now seen corresponding path program 15 times [2018-10-21 12:38:22,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:22,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:22,566 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:22,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:22,566 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:22,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:22,993 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 416 proven. 360 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-21 12:38:22,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:22,993 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:22,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:22,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:22,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:22,994 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:23,002 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:23,002 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:23,026 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-21 12:38:23,026 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:23,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:23,455 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-21 12:38:23,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:23,925 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-21 12:38:23,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:23,945 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:23,961 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:23,961 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:24,054 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-21 12:38:24,054 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:24,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:24,066 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-21 12:38:24,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:24,116 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-21 12:38:24,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:24,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 12, 12, 12] total 38 [2018-10-21 12:38:24,117 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:24,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-21 12:38:24,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-21 12:38:24,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-21 12:38:24,119 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 28 states. [2018-10-21 12:38:24,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:24,495 INFO L93 Difference]: Finished difference Result 125 states and 147 transitions. [2018-10-21 12:38:24,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-21 12:38:24,496 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 83 [2018-10-21 12:38:24,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:24,497 INFO L225 Difference]: With dead ends: 125 [2018-10-21 12:38:24,498 INFO L226 Difference]: Without dead ends: 91 [2018-10-21 12:38:24,499 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-21 12:38:24,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-21 12:38:24,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-21 12:38:24,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-21 12:38:24,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2018-10-21 12:38:24,510 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 83 [2018-10-21 12:38:24,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:24,510 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2018-10-21 12:38:24,510 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-21 12:38:24,510 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2018-10-21 12:38:24,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-21 12:38:24,512 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:24,512 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:24,513 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:24,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:24,513 INFO L82 PathProgramCache]: Analyzing trace with hash 223548959, now seen corresponding path program 16 times [2018-10-21 12:38:24,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:24,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:24,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:24,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:24,516 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:24,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:24,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:24,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:24,716 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:24,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:24,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:24,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:24,716 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:24,726 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:24,726 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:24,749 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:24,749 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:24,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:24,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:24,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:25,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:25,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:25,558 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:25,574 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:25,574 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:25,624 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:25,625 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:25,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:25,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:25,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:25,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:25,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:25,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-21 12:38:25,678 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:25,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-21 12:38:25,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-21 12:38:25,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-21 12:38:25,680 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand 19 states. [2018-10-21 12:38:25,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:25,764 INFO L93 Difference]: Finished difference Result 130 states and 151 transitions. [2018-10-21 12:38:25,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-21 12:38:25,765 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 89 [2018-10-21 12:38:25,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:25,767 INFO L225 Difference]: With dead ends: 130 [2018-10-21 12:38:25,768 INFO L226 Difference]: Without dead ends: 93 [2018-10-21 12:38:25,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-21 12:38:25,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-21 12:38:25,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-10-21 12:38:25,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-21 12:38:25,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2018-10-21 12:38:25,775 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 89 [2018-10-21 12:38:25,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:25,776 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2018-10-21 12:38:25,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-21 12:38:25,776 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2018-10-21 12:38:25,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-21 12:38:25,777 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:25,777 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:25,777 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:25,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:25,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1580850010, now seen corresponding path program 17 times [2018-10-21 12:38:25,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:25,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:25,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:25,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:25,778 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:25,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:26,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:26,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:26,560 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:26,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:26,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:26,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:26,561 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:26,570 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:26,570 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:26,608 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-21 12:38:26,608 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:26,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:26,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:26,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:26,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:27,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:27,011 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:27,026 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:27,026 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:27,213 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-21 12:38:27,214 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:27,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:27,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:27,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:27,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (35)] Exception during sending of exit command (exit): Broken pipe [2018-10-21 12:38:27,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:27,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-21 12:38:27,257 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:27,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-21 12:38:27,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-21 12:38:27,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-21 12:38:27,258 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand 20 states. [2018-10-21 12:38:27,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:27,473 INFO L93 Difference]: Finished difference Result 133 states and 154 transitions. [2018-10-21 12:38:27,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-21 12:38:27,474 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 92 [2018-10-21 12:38:27,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:27,475 INFO L225 Difference]: With dead ends: 133 [2018-10-21 12:38:27,475 INFO L226 Difference]: Without dead ends: 96 [2018-10-21 12:38:27,476 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-21 12:38:27,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-21 12:38:27,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2018-10-21 12:38:27,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-21 12:38:27,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-10-21 12:38:27,482 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 92 [2018-10-21 12:38:27,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:27,483 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-10-21 12:38:27,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-21 12:38:27,484 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-10-21 12:38:27,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-21 12:38:27,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:27,485 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 18, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:27,485 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:27,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:27,485 INFO L82 PathProgramCache]: Analyzing trace with hash -180631489, now seen corresponding path program 18 times [2018-10-21 12:38:27,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:27,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:27,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:27,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:27,486 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:27,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:28,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:28,029 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:28,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:28,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:28,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:28,030 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:28,039 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:28,039 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:28,085 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-21 12:38:28,086 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:28,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:28,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:28,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:28,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:28,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:28,965 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:28,982 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:28,982 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:29,198 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-21 12:38:29,198 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:29,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:29,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:29,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:29,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:29,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:29,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-10-21 12:38:29,232 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:29,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-21 12:38:29,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-21 12:38:29,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-21 12:38:29,236 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 21 states. [2018-10-21 12:38:29,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:29,346 INFO L93 Difference]: Finished difference Result 136 states and 157 transitions. [2018-10-21 12:38:29,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-21 12:38:29,347 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 95 [2018-10-21 12:38:29,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:29,348 INFO L225 Difference]: With dead ends: 136 [2018-10-21 12:38:29,349 INFO L226 Difference]: Without dead ends: 99 [2018-10-21 12:38:29,349 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-21 12:38:29,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-21 12:38:29,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-21 12:38:29,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-21 12:38:29,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 109 transitions. [2018-10-21 12:38:29,356 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 109 transitions. Word has length 95 [2018-10-21 12:38:29,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:29,356 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 109 transitions. [2018-10-21 12:38:29,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-21 12:38:29,356 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 109 transitions. [2018-10-21 12:38:29,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-21 12:38:29,357 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:29,357 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 19, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:29,357 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:29,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:29,358 INFO L82 PathProgramCache]: Analyzing trace with hash -565545670, now seen corresponding path program 19 times [2018-10-21 12:38:29,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:29,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:29,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:29,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:29,359 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:29,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:29,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:29,650 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:29,650 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:29,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:29,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:29,650 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:29,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:29,660 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:29,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:29,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:29,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:30,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:30,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:30,160 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:30,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:30,176 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:30,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:30,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:30,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:30,236 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:30,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:30,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:30,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-21 12:38:30,272 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:30,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-21 12:38:30,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-21 12:38:30,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-21 12:38:30,274 INFO L87 Difference]: Start difference. First operand 99 states and 109 transitions. Second operand 22 states. [2018-10-21 12:38:30,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:30,357 INFO L93 Difference]: Finished difference Result 139 states and 160 transitions. [2018-10-21 12:38:30,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-21 12:38:30,361 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 98 [2018-10-21 12:38:30,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:30,362 INFO L225 Difference]: With dead ends: 139 [2018-10-21 12:38:30,362 INFO L226 Difference]: Without dead ends: 102 [2018-10-21 12:38:30,365 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-21 12:38:30,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-21 12:38:30,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-10-21 12:38:30,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-21 12:38:30,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 112 transitions. [2018-10-21 12:38:30,372 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 112 transitions. Word has length 98 [2018-10-21 12:38:30,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:30,373 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 112 transitions. [2018-10-21 12:38:30,373 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-21 12:38:30,373 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 112 transitions. [2018-10-21 12:38:30,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-21 12:38:30,374 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:30,377 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:30,378 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:30,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:30,378 INFO L82 PathProgramCache]: Analyzing trace with hash 18768479, now seen corresponding path program 20 times [2018-10-21 12:38:30,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:30,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:30,381 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:30,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:30,382 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:30,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:30,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:30,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:30,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:30,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:30,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:30,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:30,669 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:30,689 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:30,689 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:30,711 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:30,711 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:30,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:30,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:31,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:31,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:31,293 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:31,308 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:31,308 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:31,362 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:31,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:31,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:31,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:31,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:31,405 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:31,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-21 12:38:31,405 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:31,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-21 12:38:31,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-21 12:38:31,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-21 12:38:31,407 INFO L87 Difference]: Start difference. First operand 102 states and 112 transitions. Second operand 23 states. [2018-10-21 12:38:31,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:31,515 INFO L93 Difference]: Finished difference Result 142 states and 163 transitions. [2018-10-21 12:38:31,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-21 12:38:31,516 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 101 [2018-10-21 12:38:31,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:31,517 INFO L225 Difference]: With dead ends: 142 [2018-10-21 12:38:31,517 INFO L226 Difference]: Without dead ends: 105 [2018-10-21 12:38:31,518 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 383 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-21 12:38:31,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-21 12:38:31,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-21 12:38:31,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-21 12:38:31,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 115 transitions. [2018-10-21 12:38:31,526 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 115 transitions. Word has length 101 [2018-10-21 12:38:31,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:31,527 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 115 transitions. [2018-10-21 12:38:31,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-21 12:38:31,527 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 115 transitions. [2018-10-21 12:38:31,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-21 12:38:31,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:31,531 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 21, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:31,531 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:31,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:31,532 INFO L82 PathProgramCache]: Analyzing trace with hash -180869350, now seen corresponding path program 21 times [2018-10-21 12:38:31,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:31,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:31,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:31,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:31,533 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:31,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:31,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 638 proven. 693 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-21 12:38:31,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:31,855 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:31,855 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:31,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:31,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:31,855 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:31,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:31,866 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:31,895 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-21 12:38:31,896 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:31,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:32,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-21 12:38:32,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:32,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-21 12:38:32,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:32,664 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:32,694 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:32,694 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:32,810 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-21 12:38:32,810 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:32,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:32,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-21 12:38:32,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:32,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-21 12:38:32,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:32,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13, 13, 13] total 46 [2018-10-21 12:38:32,837 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:32,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-21 12:38:32,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-21 12:38:32,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-21 12:38:32,839 INFO L87 Difference]: Start difference. First operand 105 states and 115 transitions. Second operand 35 states. [2018-10-21 12:38:33,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:33,115 INFO L93 Difference]: Finished difference Result 149 states and 173 transitions. [2018-10-21 12:38:33,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-21 12:38:33,117 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 104 [2018-10-21 12:38:33,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:33,118 INFO L225 Difference]: With dead ends: 149 [2018-10-21 12:38:33,118 INFO L226 Difference]: Without dead ends: 112 [2018-10-21 12:38:33,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-21 12:38:33,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-21 12:38:33,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-21 12:38:33,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-21 12:38:33,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 122 transitions. [2018-10-21 12:38:33,126 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 122 transitions. Word has length 104 [2018-10-21 12:38:33,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:33,127 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 122 transitions. [2018-10-21 12:38:33,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-21 12:38:33,129 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 122 transitions. [2018-10-21 12:38:33,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-21 12:38:33,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:33,131 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 22, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:33,131 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:33,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:33,132 INFO L82 PathProgramCache]: Analyzing trace with hash 102799356, now seen corresponding path program 22 times [2018-10-21 12:38:33,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:33,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:33,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:33,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:33,136 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:33,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:33,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:33,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:33,457 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:33,457 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:33,457 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:33,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:33,458 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:33,467 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:33,468 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:33,493 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:33,493 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:33,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:33,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:33,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:34,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:34,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:34,178 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:34,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:34,194 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:34,246 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:34,246 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:34,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:34,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:34,267 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:34,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:34,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:34,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-10-21 12:38:34,299 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:34,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-21 12:38:34,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-21 12:38:34,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-21 12:38:34,301 INFO L87 Difference]: Start difference. First operand 111 states and 122 transitions. Second operand 25 states. [2018-10-21 12:38:34,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:34,406 INFO L93 Difference]: Finished difference Result 154 states and 177 transitions. [2018-10-21 12:38:34,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-21 12:38:34,408 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 110 [2018-10-21 12:38:34,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:34,410 INFO L225 Difference]: With dead ends: 154 [2018-10-21 12:38:34,410 INFO L226 Difference]: Without dead ends: 114 [2018-10-21 12:38:34,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 417 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-21 12:38:34,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-21 12:38:34,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-10-21 12:38:34,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-21 12:38:34,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 125 transitions. [2018-10-21 12:38:34,420 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 125 transitions. Word has length 110 [2018-10-21 12:38:34,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:34,421 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 125 transitions. [2018-10-21 12:38:34,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-21 12:38:34,422 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 125 transitions. [2018-10-21 12:38:34,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-21 12:38:34,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:34,422 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 23, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:34,423 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:34,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:34,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1248392609, now seen corresponding path program 23 times [2018-10-21 12:38:34,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:34,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:34,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:34,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:34,429 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:34,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:34,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:34,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:34,916 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:34,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:34,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:34,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:34,917 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:34,928 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:34,929 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:34,986 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2018-10-21 12:38:34,986 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:34,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:35,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:35,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:35,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:35,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:35,739 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:35,740 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:35,990 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2018-10-21 12:38:35,991 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:35,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:36,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:36,014 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:36,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:36,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:36,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-10-21 12:38:36,036 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:36,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-21 12:38:36,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-21 12:38:36,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-21 12:38:36,038 INFO L87 Difference]: Start difference. First operand 114 states and 125 transitions. Second operand 26 states. [2018-10-21 12:38:36,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:36,148 INFO L93 Difference]: Finished difference Result 157 states and 180 transitions. [2018-10-21 12:38:36,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-21 12:38:36,149 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 113 [2018-10-21 12:38:36,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:36,151 INFO L225 Difference]: With dead ends: 157 [2018-10-21 12:38:36,151 INFO L226 Difference]: Without dead ends: 117 [2018-10-21 12:38:36,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-21 12:38:36,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-21 12:38:36,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-21 12:38:36,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-21 12:38:36,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 128 transitions. [2018-10-21 12:38:36,158 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 128 transitions. Word has length 113 [2018-10-21 12:38:36,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:36,158 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 128 transitions. [2018-10-21 12:38:36,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-21 12:38:36,159 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 128 transitions. [2018-10-21 12:38:36,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-21 12:38:36,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:36,159 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 24, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:36,160 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:36,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:36,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1806858716, now seen corresponding path program 24 times [2018-10-21 12:38:36,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:36,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:36,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:36,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:36,161 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:36,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:36,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 800 proven. 900 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-21 12:38:36,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:36,583 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:36,583 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:36,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:36,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:36,583 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:36,594 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:36,594 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:36,697 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-21 12:38:36,697 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:36,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 852 proven. 805 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-21 12:38:38,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:39,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 852 proven. 805 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-21 12:38:39,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:39,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:39,880 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:39,880 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:40,169 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-21 12:38:40,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:40,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:40,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 884 proven. 737 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-21 12:38:40,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:40,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 884 proven. 737 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-21 12:38:40,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:40,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26, 25, 25] total 75 [2018-10-21 12:38:40,207 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:40,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-21 12:38:40,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-21 12:38:40,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-21 12:38:40,212 INFO L87 Difference]: Start difference. First operand 117 states and 128 transitions. Second operand 51 states. [2018-10-21 12:38:40,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:40,634 INFO L93 Difference]: Finished difference Result 200 states and 250 transitions. [2018-10-21 12:38:40,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-21 12:38:40,635 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 116 [2018-10-21 12:38:40,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:40,637 INFO L225 Difference]: With dead ends: 200 [2018-10-21 12:38:40,637 INFO L226 Difference]: Without dead ends: 160 [2018-10-21 12:38:40,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-21 12:38:40,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-21 12:38:40,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-21 12:38:40,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-21 12:38:40,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 183 transitions. [2018-10-21 12:38:40,647 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 183 transitions. Word has length 116 [2018-10-21 12:38:40,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:40,647 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 183 transitions. [2018-10-21 12:38:40,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-21 12:38:40,648 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 183 transitions. [2018-10-21 12:38:40,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-21 12:38:40,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:40,652 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:40,652 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:40,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:40,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1028485830, now seen corresponding path program 25 times [2018-10-21 12:38:40,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:40,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:40,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:40,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:40,657 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:40,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:41,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:41,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:41,141 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:41,141 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:41,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:41,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:41,142 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:41,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:41,152 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:41,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:41,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:41,212 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:41,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:42,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:42,273 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:42,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:42,289 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:42,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:42,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:42,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:42,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:42,582 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (51)] Exception during sending of exit command (exit): Broken pipe [2018-10-21 12:38:42,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:42,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 52 [2018-10-21 12:38:42,584 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:42,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-21 12:38:42,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-21 12:38:42,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:42,586 INFO L87 Difference]: Start difference. First operand 159 states and 183 transitions. Second operand 28 states. [2018-10-21 12:38:42,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:42,718 INFO L93 Difference]: Finished difference Result 241 states and 290 transitions. [2018-10-21 12:38:42,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-21 12:38:42,720 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 158 [2018-10-21 12:38:42,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:42,722 INFO L225 Difference]: With dead ends: 241 [2018-10-21 12:38:42,722 INFO L226 Difference]: Without dead ends: 162 [2018-10-21 12:38:42,724 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 604 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:42,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-21 12:38:42,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-10-21 12:38:42,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-21 12:38:42,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 186 transitions. [2018-10-21 12:38:42,732 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 186 transitions. Word has length 158 [2018-10-21 12:38:42,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:42,733 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 186 transitions. [2018-10-21 12:38:42,733 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-21 12:38:42,733 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 186 transitions. [2018-10-21 12:38:42,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-21 12:38:42,734 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:42,734 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 26, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:42,734 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:42,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:42,734 INFO L82 PathProgramCache]: Analyzing trace with hash 127741151, now seen corresponding path program 26 times [2018-10-21 12:38:42,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:42,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:42,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:42,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:42,735 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:42,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:43,515 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:43,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:43,515 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:43,516 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:43,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:43,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:43,516 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-21 12:38:43,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:43,527 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:43,574 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:43,574 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:43,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:43,596 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:43,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:44,513 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:44,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:44,533 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:44,549 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:38:44,549 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:44,633 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:38:44,633 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:44,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:44,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:44,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:44,818 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:44,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:44,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 52 [2018-10-21 12:38:44,820 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:44,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-21 12:38:44,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-21 12:38:44,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:44,822 INFO L87 Difference]: Start difference. First operand 162 states and 186 transitions. Second operand 29 states. [2018-10-21 12:38:44,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:44,946 INFO L93 Difference]: Finished difference Result 244 states and 293 transitions. [2018-10-21 12:38:44,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-21 12:38:44,948 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 161 [2018-10-21 12:38:44,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:44,949 INFO L225 Difference]: With dead ends: 244 [2018-10-21 12:38:44,950 INFO L226 Difference]: Without dead ends: 165 [2018-10-21 12:38:44,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 671 GetRequests, 613 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:44,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-21 12:38:44,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-21 12:38:44,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-21 12:38:44,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 189 transitions. [2018-10-21 12:38:44,958 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 189 transitions. Word has length 161 [2018-10-21 12:38:44,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:44,959 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 189 transitions. [2018-10-21 12:38:44,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-21 12:38:44,959 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 189 transitions. [2018-10-21 12:38:44,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-21 12:38:44,960 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:44,960 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 27, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:44,960 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:44,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:44,960 INFO L82 PathProgramCache]: Analyzing trace with hash -351981798, now seen corresponding path program 27 times [2018-10-21 12:38:44,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:44,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:44,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:44,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:44,961 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:44,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:45,573 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1988 proven. 1134 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-21 12:38:45,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:45,574 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:45,574 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:45,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:45,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:45,575 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:45,586 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:45,586 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:45,644 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-21 12:38:45,645 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:45,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-21 12:38:46,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:47,652 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-21 12:38:47,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:47,671 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:47,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:38:47,688 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:38:48,069 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-21 12:38:48,069 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:48,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:48,093 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-21 12:38:48,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:48,121 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-21 12:38:48,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:48,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27, 27, 27, 27] total 80 [2018-10-21 12:38:48,123 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:48,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-21 12:38:48,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-21 12:38:48,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-21 12:38:48,124 INFO L87 Difference]: Start difference. First operand 165 states and 189 transitions. Second operand 55 states. [2018-10-21 12:38:48,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:48,724 INFO L93 Difference]: Finished difference Result 251 states and 303 transitions. [2018-10-21 12:38:48,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-21 12:38:48,725 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 164 [2018-10-21 12:38:48,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:48,726 INFO L225 Difference]: With dead ends: 251 [2018-10-21 12:38:48,726 INFO L226 Difference]: Without dead ends: 172 [2018-10-21 12:38:48,727 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-21 12:38:48,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-21 12:38:48,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-21 12:38:48,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-21 12:38:48,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 196 transitions. [2018-10-21 12:38:48,736 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 196 transitions. Word has length 164 [2018-10-21 12:38:48,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:48,737 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 196 transitions. [2018-10-21 12:38:48,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-21 12:38:48,737 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 196 transitions. [2018-10-21 12:38:48,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-21 12:38:48,742 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:48,742 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 28, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:48,742 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:48,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:48,743 INFO L82 PathProgramCache]: Analyzing trace with hash 820030844, now seen corresponding path program 28 times [2018-10-21 12:38:48,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:48,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:48,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:48,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:48,744 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:48,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:49,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:49,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:49,227 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:49,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:49,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:49,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:49,228 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:49,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:49,239 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:49,282 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:49,282 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:49,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:49,306 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:49,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:50,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:50,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:50,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:50,127 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:38:50,127 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:38:50,239 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:38:50,239 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:50,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:50,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:50,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:50,554 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:50,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:50,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 52 [2018-10-21 12:38:50,556 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:50,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-21 12:38:50,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-21 12:38:50,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:50,558 INFO L87 Difference]: Start difference. First operand 171 states and 196 transitions. Second operand 31 states. [2018-10-21 12:38:51,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:51,533 INFO L93 Difference]: Finished difference Result 256 states and 307 transitions. [2018-10-21 12:38:51,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-21 12:38:51,535 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 170 [2018-10-21 12:38:51,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:51,537 INFO L225 Difference]: With dead ends: 256 [2018-10-21 12:38:51,537 INFO L226 Difference]: Without dead ends: 174 [2018-10-21 12:38:51,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 643 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:51,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-21 12:38:51,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-10-21 12:38:51,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-21 12:38:51,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 199 transitions. [2018-10-21 12:38:51,546 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 199 transitions. Word has length 170 [2018-10-21 12:38:51,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:51,547 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 199 transitions. [2018-10-21 12:38:51,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-21 12:38:51,547 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 199 transitions. [2018-10-21 12:38:51,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-21 12:38:51,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:51,548 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 29, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:51,548 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:51,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:51,549 INFO L82 PathProgramCache]: Analyzing trace with hash -2109211231, now seen corresponding path program 29 times [2018-10-21 12:38:51,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:51,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:51,549 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:51,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:51,550 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:51,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:52,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:52,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:52,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:52,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:52,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:52,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:52,224 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:52,238 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:52,238 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:52,328 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 55 check-sat command(s) [2018-10-21 12:38:52,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:52,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:52,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:52,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:53,142 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:53,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:53,162 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:53,178 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:38:53,178 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:38:53,779 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 55 check-sat command(s) [2018-10-21 12:38:53,779 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:53,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:53,813 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:53,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:54,052 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:54,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:54,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 52 [2018-10-21 12:38:54,054 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:54,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-21 12:38:54,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-21 12:38:54,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:54,055 INFO L87 Difference]: Start difference. First operand 174 states and 199 transitions. Second operand 32 states. [2018-10-21 12:38:54,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:54,196 INFO L93 Difference]: Finished difference Result 259 states and 310 transitions. [2018-10-21 12:38:54,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-21 12:38:54,197 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 173 [2018-10-21 12:38:54,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:54,199 INFO L225 Difference]: With dead ends: 259 [2018-10-21 12:38:54,199 INFO L226 Difference]: Without dead ends: 177 [2018-10-21 12:38:54,200 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 652 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:54,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-21 12:38:54,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-21 12:38:54,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-21 12:38:54,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 202 transitions. [2018-10-21 12:38:54,208 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 202 transitions. Word has length 173 [2018-10-21 12:38:54,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:54,208 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 202 transitions. [2018-10-21 12:38:54,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-21 12:38:54,209 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 202 transitions. [2018-10-21 12:38:54,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-21 12:38:54,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:54,210 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 30, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:54,210 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:54,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:54,210 INFO L82 PathProgramCache]: Analyzing trace with hash -2014347428, now seen corresponding path program 30 times [2018-10-21 12:38:54,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:54,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:54,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:54,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:54,211 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:54,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:54,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:54,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:54,684 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:54,684 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:54,684 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:54,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:54,684 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:54,696 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:54,697 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:54,792 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-21 12:38:54,793 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:54,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:54,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:54,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:55,766 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:55,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:55,786 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:55,803 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:38:55,803 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:38:56,577 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-21 12:38:56,577 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:38:56,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:56,613 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:56,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:57,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:57,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:38:57,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 52 [2018-10-21 12:38:57,030 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:38:57,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-21 12:38:57,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-21 12:38:57,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:57,033 INFO L87 Difference]: Start difference. First operand 177 states and 202 transitions. Second operand 33 states. [2018-10-21 12:38:57,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:38:57,214 INFO L93 Difference]: Finished difference Result 262 states and 313 transitions. [2018-10-21 12:38:57,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-21 12:38:57,215 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 176 [2018-10-21 12:38:57,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:38:57,217 INFO L225 Difference]: With dead ends: 262 [2018-10-21 12:38:57,218 INFO L226 Difference]: Without dead ends: 180 [2018-10-21 12:38:57,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 735 GetRequests, 661 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:38:57,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-21 12:38:57,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2018-10-21 12:38:57,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-21 12:38:57,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-10-21 12:38:57,231 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 176 [2018-10-21 12:38:57,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:38:57,232 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-10-21 12:38:57,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-21 12:38:57,232 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-10-21 12:38:57,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-21 12:38:57,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:38:57,233 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 31, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:38:57,233 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:38:57,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:38:57,234 INFO L82 PathProgramCache]: Analyzing trace with hash -2015273023, now seen corresponding path program 31 times [2018-10-21 12:38:57,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:38:57,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:57,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:38:57,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:38:57,240 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:38:57,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:58,052 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:58,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:58,052 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:38:58,052 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:38:58,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:38:58,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:58,053 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:38:58,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:58,061 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:58,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:58,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:58,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:58,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:38:59,245 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:59,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:38:59,265 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:38:59,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:38:59,282 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:38:59,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:38:59,378 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:38:59,410 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:38:59,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:00,351 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:00,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:00,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 52 [2018-10-21 12:39:00,353 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:00,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-21 12:39:00,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-21 12:39:00,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:00,354 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 34 states. [2018-10-21 12:39:00,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:00,530 INFO L93 Difference]: Finished difference Result 265 states and 316 transitions. [2018-10-21 12:39:00,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-21 12:39:00,532 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 179 [2018-10-21 12:39:00,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:00,534 INFO L225 Difference]: With dead ends: 265 [2018-10-21 12:39:00,534 INFO L226 Difference]: Without dead ends: 183 [2018-10-21 12:39:00,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 670 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:00,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-21 12:39:00,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2018-10-21 12:39:00,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-21 12:39:00,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 208 transitions. [2018-10-21 12:39:00,544 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 208 transitions. Word has length 179 [2018-10-21 12:39:00,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:00,544 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 208 transitions. [2018-10-21 12:39:00,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-21 12:39:00,544 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 208 transitions. [2018-10-21 12:39:00,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-21 12:39:00,545 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:00,545 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 32, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:00,545 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:00,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:00,546 INFO L82 PathProgramCache]: Analyzing trace with hash 475097404, now seen corresponding path program 32 times [2018-10-21 12:39:00,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:00,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:00,546 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:00,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:00,547 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:00,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:01,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:01,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:01,110 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:01,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:01,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:01,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:01,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:01,123 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:01,123 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:01,165 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:01,165 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:01,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:01,191 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:01,191 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:02,004 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:02,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:02,024 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:02,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:02,041 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:02,136 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:02,137 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:02,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:02,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:02,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:02,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:02,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:02,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 52 [2018-10-21 12:39:02,624 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:02,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-21 12:39:02,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-21 12:39:02,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:02,626 INFO L87 Difference]: Start difference. First operand 183 states and 208 transitions. Second operand 35 states. [2018-10-21 12:39:03,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:03,189 INFO L93 Difference]: Finished difference Result 268 states and 319 transitions. [2018-10-21 12:39:03,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-21 12:39:03,190 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 182 [2018-10-21 12:39:03,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:03,191 INFO L225 Difference]: With dead ends: 268 [2018-10-21 12:39:03,191 INFO L226 Difference]: Without dead ends: 186 [2018-10-21 12:39:03,192 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 761 GetRequests, 679 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:03,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-21 12:39:03,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2018-10-21 12:39:03,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-21 12:39:03,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 211 transitions. [2018-10-21 12:39:03,202 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 211 transitions. Word has length 182 [2018-10-21 12:39:03,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:03,203 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 211 transitions. [2018-10-21 12:39:03,203 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-21 12:39:03,203 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 211 transitions. [2018-10-21 12:39:03,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-21 12:39:03,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:03,209 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 33, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:03,209 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:03,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:03,210 INFO L82 PathProgramCache]: Analyzing trace with hash -164582943, now seen corresponding path program 33 times [2018-10-21 12:39:03,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:03,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:03,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:03,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:03,214 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:03,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:04,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2516 proven. 1683 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-21 12:39:04,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:04,031 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:04,031 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:04,031 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:04,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:04,032 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:04,042 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:04,042 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:04,102 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-21 12:39:04,102 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:04,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:04,996 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-21 12:39:04,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:06,273 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-21 12:39:06,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:06,293 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:06,309 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:06,309 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:06,700 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-21 12:39:06,700 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:06,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:06,734 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-21 12:39:06,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-21 12:39:06,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:06,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 28, 28, 28, 28] total 86 [2018-10-21 12:39:06,878 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:06,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-21 12:39:06,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-21 12:39:06,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-21 12:39:06,880 INFO L87 Difference]: Start difference. First operand 186 states and 211 transitions. Second operand 62 states. [2018-10-21 12:39:07,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:07,345 INFO L93 Difference]: Finished difference Result 275 states and 329 transitions. [2018-10-21 12:39:07,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-21 12:39:07,347 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 185 [2018-10-21 12:39:07,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:07,349 INFO L225 Difference]: With dead ends: 275 [2018-10-21 12:39:07,349 INFO L226 Difference]: Without dead ends: 193 [2018-10-21 12:39:07,350 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 686 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-21 12:39:07,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-21 12:39:07,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-21 12:39:07,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-21 12:39:07,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 218 transitions. [2018-10-21 12:39:07,359 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 218 transitions. Word has length 185 [2018-10-21 12:39:07,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:07,359 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 218 transitions. [2018-10-21 12:39:07,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-21 12:39:07,359 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 218 transitions. [2018-10-21 12:39:07,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-21 12:39:07,363 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:07,364 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 34, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:07,364 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:07,364 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:07,364 INFO L82 PathProgramCache]: Analyzing trace with hash -1265979329, now seen corresponding path program 34 times [2018-10-21 12:39:07,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:07,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,368 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:07,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,368 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:09,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:09,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:09,261 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:09,262 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:09,262 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:09,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:09,262 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:09,273 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:09,273 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:09,330 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:09,330 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:09,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:09,368 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:09,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:10,273 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:10,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:10,293 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:10,309 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:10,309 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:10,406 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:10,407 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:10,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:10,439 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:10,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:10,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:10,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:10,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 52 [2018-10-21 12:39:10,860 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:10,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-21 12:39:10,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-21 12:39:10,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:10,862 INFO L87 Difference]: Start difference. First operand 192 states and 218 transitions. Second operand 37 states. [2018-10-21 12:39:11,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:11,012 INFO L93 Difference]: Finished difference Result 280 states and 333 transitions. [2018-10-21 12:39:11,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-21 12:39:11,015 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 191 [2018-10-21 12:39:11,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:11,016 INFO L225 Difference]: With dead ends: 280 [2018-10-21 12:39:11,016 INFO L226 Difference]: Without dead ends: 195 [2018-10-21 12:39:11,017 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 709 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:11,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-21 12:39:11,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2018-10-21 12:39:11,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-21 12:39:11,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 221 transitions. [2018-10-21 12:39:11,026 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 221 transitions. Word has length 191 [2018-10-21 12:39:11,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:11,026 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 221 transitions. [2018-10-21 12:39:11,026 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-21 12:39:11,027 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 221 transitions. [2018-10-21 12:39:11,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-21 12:39:11,028 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:11,031 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 35, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:11,031 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:11,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:11,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1428773178, now seen corresponding path program 35 times [2018-10-21 12:39:11,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:11,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:11,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:11,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:11,032 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:11,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:11,722 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:11,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:11,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:11,723 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:11,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:11,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:11,723 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:11,734 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:11,734 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:11,837 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2018-10-21 12:39:11,837 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:11,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:11,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:11,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:12,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:12,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:12,752 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:12,768 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:12,768 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:13,478 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2018-10-21 12:39:13,479 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:13,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:13,516 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:13,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:14,229 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:14,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:14,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 52 [2018-10-21 12:39:14,231 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:14,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-21 12:39:14,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-21 12:39:14,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:14,233 INFO L87 Difference]: Start difference. First operand 195 states and 221 transitions. Second operand 38 states. [2018-10-21 12:39:14,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:14,348 INFO L93 Difference]: Finished difference Result 283 states and 336 transitions. [2018-10-21 12:39:14,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-21 12:39:14,356 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 194 [2018-10-21 12:39:14,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:14,357 INFO L225 Difference]: With dead ends: 283 [2018-10-21 12:39:14,357 INFO L226 Difference]: Without dead ends: 198 [2018-10-21 12:39:14,358 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 718 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-10-21 12:39:14,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2018-10-21 12:39:14,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-21 12:39:14,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 224 transitions. [2018-10-21 12:39:14,371 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 224 transitions. Word has length 194 [2018-10-21 12:39:14,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:14,371 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 224 transitions. [2018-10-21 12:39:14,371 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-21 12:39:14,371 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 224 transitions. [2018-10-21 12:39:14,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-21 12:39:14,372 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:14,372 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 36, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:14,380 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:14,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:14,380 INFO L82 PathProgramCache]: Analyzing trace with hash -727987617, now seen corresponding path program 36 times [2018-10-21 12:39:14,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:14,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:14,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,381 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:14,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:15,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:15,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:15,268 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:15,268 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:15,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:15,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:15,269 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:15,281 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:39:15,281 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:39:15,387 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-21 12:39:15,387 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:15,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:15,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:15,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:16,592 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:16,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:16,612 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:16,634 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:39:16,634 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:39:17,410 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-21 12:39:17,410 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:17,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:17,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:17,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:17,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:17,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 52 [2018-10-21 12:39:17,912 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:17,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-21 12:39:17,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-21 12:39:17,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:17,913 INFO L87 Difference]: Start difference. First operand 198 states and 224 transitions. Second operand 39 states. [2018-10-21 12:39:18,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:18,050 INFO L93 Difference]: Finished difference Result 286 states and 339 transitions. [2018-10-21 12:39:18,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-21 12:39:18,052 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 197 [2018-10-21 12:39:18,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:18,053 INFO L225 Difference]: With dead ends: 286 [2018-10-21 12:39:18,053 INFO L226 Difference]: Without dead ends: 201 [2018-10-21 12:39:18,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 825 GetRequests, 727 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:18,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-10-21 12:39:18,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2018-10-21 12:39:18,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-21 12:39:18,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 227 transitions. [2018-10-21 12:39:18,066 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 227 transitions. Word has length 197 [2018-10-21 12:39:18,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:18,067 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 227 transitions. [2018-10-21 12:39:18,069 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-21 12:39:18,070 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 227 transitions. [2018-10-21 12:39:18,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-21 12:39:18,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:18,071 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 37, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:18,071 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:18,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:18,071 INFO L82 PathProgramCache]: Analyzing trace with hash -78083302, now seen corresponding path program 37 times [2018-10-21 12:39:18,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:18,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:18,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:18,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:18,078 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:18,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:19,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:19,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:19,642 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:19,642 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:19,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:19,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:19,642 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:19,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:19,654 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:19,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:19,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:19,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:19,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:20,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:20,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:20,651 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:20,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:20,667 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:20,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:20,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:20,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:20,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:21,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:21,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:21,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 52 [2018-10-21 12:39:21,325 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:21,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-21 12:39:21,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-21 12:39:21,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:21,326 INFO L87 Difference]: Start difference. First operand 201 states and 227 transitions. Second operand 40 states. [2018-10-21 12:39:21,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:21,556 INFO L93 Difference]: Finished difference Result 289 states and 342 transitions. [2018-10-21 12:39:21,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-21 12:39:21,558 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 200 [2018-10-21 12:39:21,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:21,562 INFO L225 Difference]: With dead ends: 289 [2018-10-21 12:39:21,562 INFO L226 Difference]: Without dead ends: 204 [2018-10-21 12:39:21,563 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 736 SyntacticMatches, 52 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:21,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-21 12:39:21,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2018-10-21 12:39:21,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-21 12:39:21,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 230 transitions. [2018-10-21 12:39:21,576 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 230 transitions. Word has length 200 [2018-10-21 12:39:21,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:21,576 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 230 transitions. [2018-10-21 12:39:21,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-21 12:39:21,576 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 230 transitions. [2018-10-21 12:39:21,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-21 12:39:21,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:21,584 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 38, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:21,584 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:21,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:21,585 INFO L82 PathProgramCache]: Analyzing trace with hash -491205505, now seen corresponding path program 38 times [2018-10-21 12:39:21,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:21,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:21,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:21,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:21,589 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:21,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:23,115 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:23,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:23,115 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:23,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:23,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:23,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:23,115 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:23,129 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:23,129 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:23,179 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:23,179 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:23,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:23,226 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:23,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:24,391 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:24,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:24,411 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:24,428 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:24,428 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:24,532 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:24,532 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:24,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:24,566 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:24,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:25,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:25,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:25,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 52 [2018-10-21 12:39:25,096 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:25,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-21 12:39:25,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-21 12:39:25,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:25,098 INFO L87 Difference]: Start difference. First operand 204 states and 230 transitions. Second operand 41 states. [2018-10-21 12:39:25,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:25,339 INFO L93 Difference]: Finished difference Result 292 states and 345 transitions. [2018-10-21 12:39:25,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-21 12:39:25,341 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 203 [2018-10-21 12:39:25,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:25,343 INFO L225 Difference]: With dead ends: 292 [2018-10-21 12:39:25,344 INFO L226 Difference]: Without dead ends: 207 [2018-10-21 12:39:25,344 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 851 GetRequests, 745 SyntacticMatches, 56 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1372 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:25,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-21 12:39:25,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-21 12:39:25,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-21 12:39:25,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 233 transitions. [2018-10-21 12:39:25,353 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 233 transitions. Word has length 203 [2018-10-21 12:39:25,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:25,353 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 233 transitions. [2018-10-21 12:39:25,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-21 12:39:25,354 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 233 transitions. [2018-10-21 12:39:25,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-21 12:39:25,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:25,355 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 39, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:25,355 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:25,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:25,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1561515258, now seen corresponding path program 39 times [2018-10-21 12:39:25,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:25,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:25,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:25,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:25,357 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:25,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:26,155 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3080 proven. 2340 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-21 12:39:26,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:26,156 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:26,156 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:26,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:26,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:26,156 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:26,164 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:26,164 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:26,237 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-21 12:39:26,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:26,240 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:27,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-21 12:39:27,325 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:28,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-21 12:39:28,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:28,798 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:28,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:28,815 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:29,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-21 12:39:29,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:29,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:29,282 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-21 12:39:29,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-21 12:39:29,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:29,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 29, 29, 29, 29] total 92 [2018-10-21 12:39:29,625 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:29,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-21 12:39:29,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-21 12:39:29,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-21 12:39:29,626 INFO L87 Difference]: Start difference. First operand 207 states and 233 transitions. Second operand 69 states. [2018-10-21 12:39:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:30,062 INFO L93 Difference]: Finished difference Result 299 states and 355 transitions. [2018-10-21 12:39:30,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-21 12:39:30,064 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 206 [2018-10-21 12:39:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:30,065 INFO L225 Difference]: With dead ends: 299 [2018-10-21 12:39:30,065 INFO L226 Difference]: Without dead ends: 214 [2018-10-21 12:39:30,066 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 766 SyntacticMatches, 8 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-21 12:39:30,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-21 12:39:30,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-21 12:39:30,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-21 12:39:30,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 240 transitions. [2018-10-21 12:39:30,074 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 240 transitions. Word has length 206 [2018-10-21 12:39:30,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:30,075 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 240 transitions. [2018-10-21 12:39:30,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-21 12:39:30,075 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 240 transitions. [2018-10-21 12:39:30,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-21 12:39:30,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:30,076 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 40, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:30,076 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:30,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:30,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1803489756, now seen corresponding path program 40 times [2018-10-21 12:39:30,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:30,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:30,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:30,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:30,078 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:30,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:31,412 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:31,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:31,413 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:31,413 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:31,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:31,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:31,413 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:31,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:31,428 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:31,479 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:31,480 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:31,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:31,514 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:31,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:32,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:32,451 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:32,467 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:32,467 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:32,576 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:32,577 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:32,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:32,610 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:32,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:33,207 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:33,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:33,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 52 [2018-10-21 12:39:33,209 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:33,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-21 12:39:33,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-21 12:39:33,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:33,210 INFO L87 Difference]: Start difference. First operand 213 states and 240 transitions. Second operand 43 states. [2018-10-21 12:39:33,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:33,362 INFO L93 Difference]: Finished difference Result 304 states and 359 transitions. [2018-10-21 12:39:33,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-21 12:39:33,365 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 212 [2018-10-21 12:39:33,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:33,366 INFO L225 Difference]: With dead ends: 304 [2018-10-21 12:39:33,366 INFO L226 Difference]: Without dead ends: 216 [2018-10-21 12:39:33,367 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 889 GetRequests, 775 SyntacticMatches, 64 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:33,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2018-10-21 12:39:33,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2018-10-21 12:39:33,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-21 12:39:33,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 243 transitions. [2018-10-21 12:39:33,376 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 243 transitions. Word has length 212 [2018-10-21 12:39:33,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:33,377 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 243 transitions. [2018-10-21 12:39:33,377 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-21 12:39:33,377 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 243 transitions. [2018-10-21 12:39:33,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-21 12:39:33,378 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:33,378 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 41, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:33,379 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:33,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:33,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1590205503, now seen corresponding path program 41 times [2018-10-21 12:39:33,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:33,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:33,380 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:33,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:33,380 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:33,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:34,294 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:34,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:34,295 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:34,295 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:34,295 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:34,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:34,295 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:34,309 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:34,309 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:34,442 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-21 12:39:34,442 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:34,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:34,474 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:34,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:35,503 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:35,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:35,523 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:35,541 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:35,541 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:36,387 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-21 12:39:36,387 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:36,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:36,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:36,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:37,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:37,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 52 [2018-10-21 12:39:37,062 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:37,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-21 12:39:37,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-21 12:39:37,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:37,063 INFO L87 Difference]: Start difference. First operand 216 states and 243 transitions. Second operand 44 states. [2018-10-21 12:39:37,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:37,206 INFO L93 Difference]: Finished difference Result 307 states and 362 transitions. [2018-10-21 12:39:37,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-21 12:39:37,208 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 215 [2018-10-21 12:39:37,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:37,210 INFO L225 Difference]: With dead ends: 307 [2018-10-21 12:39:37,211 INFO L226 Difference]: Without dead ends: 219 [2018-10-21 12:39:37,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 784 SyntacticMatches, 68 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:37,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-21 12:39:37,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-21 12:39:37,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-21 12:39:37,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 246 transitions. [2018-10-21 12:39:37,220 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 246 transitions. Word has length 215 [2018-10-21 12:39:37,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:37,220 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 246 transitions. [2018-10-21 12:39:37,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-21 12:39:37,221 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 246 transitions. [2018-10-21 12:39:37,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-21 12:39:37,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:37,222 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 42, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:37,222 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:37,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:37,222 INFO L82 PathProgramCache]: Analyzing trace with hash 364481468, now seen corresponding path program 42 times [2018-10-21 12:39:37,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:37,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:37,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:37,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:37,223 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:37,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:38,038 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:38,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:38,038 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:38,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:38,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:38,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:38,039 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:38,055 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:39:38,055 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:39:38,175 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-21 12:39:38,175 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:38,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:38,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:39,259 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:39,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:39,280 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:39,297 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:39:39,297 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:39:40,213 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-21 12:39:40,213 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:40,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:40,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:40,955 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:40,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:40,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 52 [2018-10-21 12:39:40,957 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:40,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-21 12:39:40,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-21 12:39:40,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:40,958 INFO L87 Difference]: Start difference. First operand 219 states and 246 transitions. Second operand 45 states. [2018-10-21 12:39:41,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:41,109 INFO L93 Difference]: Finished difference Result 310 states and 365 transitions. [2018-10-21 12:39:41,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-21 12:39:41,111 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 218 [2018-10-21 12:39:41,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:41,114 INFO L225 Difference]: With dead ends: 310 [2018-10-21 12:39:41,114 INFO L226 Difference]: Without dead ends: 222 [2018-10-21 12:39:41,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 915 GetRequests, 793 SyntacticMatches, 72 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1764 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:41,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-21 12:39:41,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2018-10-21 12:39:41,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-21 12:39:41,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 249 transitions. [2018-10-21 12:39:41,124 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 249 transitions. Word has length 218 [2018-10-21 12:39:41,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:41,124 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 249 transitions. [2018-10-21 12:39:41,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-21 12:39:41,124 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 249 transitions. [2018-10-21 12:39:41,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-21 12:39:41,127 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:41,128 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 43, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:41,128 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:41,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:41,128 INFO L82 PathProgramCache]: Analyzing trace with hash 1277435361, now seen corresponding path program 43 times [2018-10-21 12:39:41,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:41,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:41,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:41,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:41,132 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:41,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:42,300 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:42,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:42,301 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:42,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:42,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:42,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:42,301 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:42,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:42,314 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:42,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:42,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:42,408 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:42,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:43,340 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:43,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:43,360 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:43,381 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:43,381 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:43,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:43,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:43,526 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:43,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:44,256 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:44,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:44,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 52 [2018-10-21 12:39:44,258 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:44,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-21 12:39:44,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-21 12:39:44,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:44,260 INFO L87 Difference]: Start difference. First operand 222 states and 249 transitions. Second operand 46 states. [2018-10-21 12:39:44,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:44,405 INFO L93 Difference]: Finished difference Result 313 states and 368 transitions. [2018-10-21 12:39:44,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-21 12:39:44,407 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 221 [2018-10-21 12:39:44,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:44,409 INFO L225 Difference]: With dead ends: 313 [2018-10-21 12:39:44,409 INFO L226 Difference]: Without dead ends: 225 [2018-10-21 12:39:44,410 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 928 GetRequests, 802 SyntacticMatches, 76 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1862 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:44,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-10-21 12:39:44,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 225. [2018-10-21 12:39:44,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-10-21 12:39:44,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-10-21 12:39:44,420 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 221 [2018-10-21 12:39:44,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:44,421 INFO L481 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-10-21 12:39:44,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-21 12:39:44,421 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-10-21 12:39:44,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-21 12:39:44,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:44,422 INFO L375 BasicCegarLoop]: trace histogram [72, 71, 44, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:44,422 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:44,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:44,423 INFO L82 PathProgramCache]: Analyzing trace with hash -941023844, now seen corresponding path program 44 times [2018-10-21 12:39:44,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:44,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:44,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:44,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:44,432 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:44,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:45,609 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:45,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:45,609 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:45,610 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:45,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:45,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:45,610 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:45,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:45,621 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:45,673 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:45,674 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:45,677 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:45,712 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:45,712 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:46,670 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:46,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:46,690 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:46,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:46,706 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:46,819 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:46,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:46,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:46,869 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:46,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:47,597 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:47,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:47,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 52 [2018-10-21 12:39:47,599 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:47,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-21 12:39:47,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-21 12:39:47,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:47,600 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 47 states. [2018-10-21 12:39:47,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:47,779 INFO L93 Difference]: Finished difference Result 316 states and 371 transitions. [2018-10-21 12:39:47,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-21 12:39:47,781 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 224 [2018-10-21 12:39:47,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:47,783 INFO L225 Difference]: With dead ends: 316 [2018-10-21 12:39:47,783 INFO L226 Difference]: Without dead ends: 228 [2018-10-21 12:39:47,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 941 GetRequests, 811 SyntacticMatches, 80 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1960 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:47,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2018-10-21 12:39:47,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2018-10-21 12:39:47,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2018-10-21 12:39:47,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 255 transitions. [2018-10-21 12:39:47,795 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 255 transitions. Word has length 224 [2018-10-21 12:39:47,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:47,799 INFO L481 AbstractCegarLoop]: Abstraction has 228 states and 255 transitions. [2018-10-21 12:39:47,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-21 12:39:47,799 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 255 transitions. [2018-10-21 12:39:47,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-10-21 12:39:47,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:47,803 INFO L375 BasicCegarLoop]: trace histogram [73, 72, 45, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:47,804 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:47,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:47,804 INFO L82 PathProgramCache]: Analyzing trace with hash -102449151, now seen corresponding path program 45 times [2018-10-21 12:39:47,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:47,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:47,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:47,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:47,807 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:47,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:48,817 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3680 proven. 3105 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-21 12:39:48,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:48,817 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:48,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:48,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:48,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:48,817 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:48,833 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:48,833 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:48,907 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-21 12:39:48,908 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:48,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:50,485 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-21 12:39:50,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:52,061 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-21 12:39:52,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:52,081 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:52,096 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:52,096 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:52,546 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-21 12:39:52,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:52,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:52,586 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-21 12:39:52,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:52,924 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-21 12:39:52,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:52,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 30, 30, 30] total 98 [2018-10-21 12:39:52,926 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:52,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-21 12:39:52,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-21 12:39:52,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-21 12:39:52,928 INFO L87 Difference]: Start difference. First operand 228 states and 255 transitions. Second operand 76 states. [2018-10-21 12:39:53,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:53,535 INFO L93 Difference]: Finished difference Result 323 states and 381 transitions. [2018-10-21 12:39:53,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-21 12:39:53,537 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 227 [2018-10-21 12:39:53,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:53,539 INFO L225 Difference]: With dead ends: 323 [2018-10-21 12:39:53,540 INFO L226 Difference]: Without dead ends: 235 [2018-10-21 12:39:53,540 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 846 SyntacticMatches, 12 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-21 12:39:53,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-10-21 12:39:53,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 234. [2018-10-21 12:39:53,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-10-21 12:39:53,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 262 transitions. [2018-10-21 12:39:53,552 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 262 transitions. Word has length 227 [2018-10-21 12:39:53,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:53,553 INFO L481 AbstractCegarLoop]: Abstraction has 234 states and 262 transitions. [2018-10-21 12:39:53,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-21 12:39:53,553 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 262 transitions. [2018-10-21 12:39:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-10-21 12:39:53,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:53,555 INFO L375 BasicCegarLoop]: trace histogram [75, 74, 46, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:53,555 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:53,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:53,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1788966879, now seen corresponding path program 46 times [2018-10-21 12:39:53,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:53,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:53,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:53,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:53,556 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:53,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:54,478 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:54,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:54,478 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:54,479 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:54,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:54,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:54,479 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:54,490 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:54,490 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:54,544 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:54,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:54,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:54,586 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:54,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:55,845 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:55,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:55,864 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:55,884 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:55,884 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:55,999 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:56,000 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:56,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:56,045 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:56,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:56,866 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:56,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:56,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 52 [2018-10-21 12:39:56,868 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:56,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-21 12:39:56,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-21 12:39:56,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:56,869 INFO L87 Difference]: Start difference. First operand 234 states and 262 transitions. Second operand 49 states. [2018-10-21 12:39:57,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:57,050 INFO L93 Difference]: Finished difference Result 328 states and 385 transitions. [2018-10-21 12:39:57,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-21 12:39:57,052 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 233 [2018-10-21 12:39:57,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:57,054 INFO L225 Difference]: With dead ends: 328 [2018-10-21 12:39:57,054 INFO L226 Difference]: Without dead ends: 237 [2018-10-21 12:39:57,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 841 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:39:57,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-21 12:39:57,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-21 12:39:57,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-21 12:39:57,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 265 transitions. [2018-10-21 12:39:57,064 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 265 transitions. Word has length 233 [2018-10-21 12:39:57,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:57,064 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 265 transitions. [2018-10-21 12:39:57,064 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-21 12:39:57,064 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 265 transitions. [2018-10-21 12:39:57,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-21 12:39:57,065 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:57,066 INFO L375 BasicCegarLoop]: trace histogram [76, 75, 47, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:57,066 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:57,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:57,066 INFO L82 PathProgramCache]: Analyzing trace with hash 496351002, now seen corresponding path program 47 times [2018-10-21 12:39:57,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:57,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:57,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:57,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:57,067 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:57,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:58,006 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:58,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:58,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:58,007 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:58,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:58,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:58,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:58,017 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:58,017 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:58,146 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 76 check-sat command(s) [2018-10-21 12:39:58,147 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:58,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:58,190 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:58,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:59,146 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:39:59,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:59,167 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:59,185 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:39:59,185 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:40:00,160 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 76 check-sat command(s) [2018-10-21 12:40:00,160 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:00,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:00,206 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:00,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:01,088 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:01,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:01,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 52 [2018-10-21 12:40:01,090 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:01,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-21 12:40:01,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-21 12:40:01,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:01,092 INFO L87 Difference]: Start difference. First operand 237 states and 265 transitions. Second operand 50 states. [2018-10-21 12:40:01,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:01,279 INFO L93 Difference]: Finished difference Result 331 states and 388 transitions. [2018-10-21 12:40:01,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-21 12:40:01,282 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 236 [2018-10-21 12:40:01,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:01,284 INFO L225 Difference]: With dead ends: 331 [2018-10-21 12:40:01,284 INFO L226 Difference]: Without dead ends: 240 [2018-10-21 12:40:01,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 850 SyntacticMatches, 92 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2254 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:01,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-21 12:40:01,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 240. [2018-10-21 12:40:01,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-21 12:40:01,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 268 transitions. [2018-10-21 12:40:01,299 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 268 transitions. Word has length 236 [2018-10-21 12:40:01,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:01,299 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 268 transitions. [2018-10-21 12:40:01,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-21 12:40:01,299 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 268 transitions. [2018-10-21 12:40:01,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2018-10-21 12:40:01,301 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:01,301 INFO L375 BasicCegarLoop]: trace histogram [77, 76, 48, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:01,301 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:01,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:01,301 INFO L82 PathProgramCache]: Analyzing trace with hash 853535231, now seen corresponding path program 48 times [2018-10-21 12:40:01,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:01,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:01,310 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:01,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:01,310 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:01,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:02,414 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:02,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:02,414 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:02,414 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:02,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:02,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:02,414 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:02,423 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:40:02,423 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:40:02,686 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 76 check-sat command(s) [2018-10-21 12:40:02,686 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:02,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:02,730 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:02,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:03,671 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:03,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:03,691 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:03,707 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:40:03,707 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:40:04,813 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 76 check-sat command(s) [2018-10-21 12:40:04,814 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:04,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:04,855 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:04,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:06,065 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:06,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:06,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 52 [2018-10-21 12:40:06,067 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:06,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-21 12:40:06,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-21 12:40:06,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:06,068 INFO L87 Difference]: Start difference. First operand 240 states and 268 transitions. Second operand 51 states. [2018-10-21 12:40:07,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:07,226 INFO L93 Difference]: Finished difference Result 334 states and 391 transitions. [2018-10-21 12:40:07,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-21 12:40:07,228 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 239 [2018-10-21 12:40:07,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:07,229 INFO L225 Difference]: With dead ends: 334 [2018-10-21 12:40:07,230 INFO L226 Difference]: Without dead ends: 243 [2018-10-21 12:40:07,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1005 GetRequests, 859 SyntacticMatches, 96 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:07,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2018-10-21 12:40:07,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2018-10-21 12:40:07,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2018-10-21 12:40:07,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 271 transitions. [2018-10-21 12:40:07,247 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 271 transitions. Word has length 239 [2018-10-21 12:40:07,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:07,247 INFO L481 AbstractCegarLoop]: Abstraction has 243 states and 271 transitions. [2018-10-21 12:40:07,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-21 12:40:07,248 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 271 transitions. [2018-10-21 12:40:07,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-10-21 12:40:07,256 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:07,256 INFO L375 BasicCegarLoop]: trace histogram [78, 77, 49, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:07,256 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:07,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:07,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1200058118, now seen corresponding path program 49 times [2018-10-21 12:40:07,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:07,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:07,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:07,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:07,258 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:07,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:08,409 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:08,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:08,409 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:08,410 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:08,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:08,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:08,410 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:08,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:40:08,423 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:40:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:08,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:08,522 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:08,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:09,440 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:09,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:09,459 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:09,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:40:09,478 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:40:09,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:09,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:09,641 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:09,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:10,864 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-21 12:40:10,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:10,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 52 [2018-10-21 12:40:10,866 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:10,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-21 12:40:10,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-21 12:40:10,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:10,867 INFO L87 Difference]: Start difference. First operand 243 states and 271 transitions. Second operand 52 states. [2018-10-21 12:40:11,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:11,055 INFO L93 Difference]: Finished difference Result 337 states and 394 transitions. [2018-10-21 12:40:11,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-21 12:40:11,057 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 242 [2018-10-21 12:40:11,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:11,059 INFO L225 Difference]: With dead ends: 337 [2018-10-21 12:40:11,059 INFO L226 Difference]: Without dead ends: 246 [2018-10-21 12:40:11,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 868 SyntacticMatches, 100 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:11,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2018-10-21 12:40:11,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 246. [2018-10-21 12:40:11,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-21 12:40:11,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 274 transitions. [2018-10-21 12:40:11,068 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 274 transitions. Word has length 242 [2018-10-21 12:40:11,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:11,069 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 274 transitions. [2018-10-21 12:40:11,069 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-21 12:40:11,069 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 274 transitions. [2018-10-21 12:40:11,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-21 12:40:11,070 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:11,070 INFO L375 BasicCegarLoop]: trace histogram [79, 78, 50, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:11,071 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:11,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:11,071 INFO L82 PathProgramCache]: Analyzing trace with hash 2009613343, now seen corresponding path program 50 times [2018-10-21 12:40:11,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:11,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:11,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:40:11,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:11,081 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:11,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 4416 proven. 1365 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-21 12:40:11,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:11,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:11,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:11,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:11,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:11,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:11,680 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:40:11,680 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:40:11,737 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:40:11,738 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:11,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:13,119 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:13,120 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:15,111 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:15,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:15,131 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:15,150 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:40:15,150 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:40:15,272 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:40:15,273 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:15,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:15,333 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:15,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:16,572 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:16,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:16,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 81, 81, 81, 81] total 102 [2018-10-21 12:40:16,574 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:16,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-21 12:40:16,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-21 12:40:16,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-21 12:40:16,577 INFO L87 Difference]: Start difference. First operand 246 states and 274 transitions. Second operand 83 states. [2018-10-21 12:40:17,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:17,223 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-10-21 12:40:17,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-21 12:40:17,225 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 245 [2018-10-21 12:40:17,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:17,227 INFO L225 Difference]: With dead ends: 261 [2018-10-21 12:40:17,227 INFO L226 Difference]: Without dead ends: 256 [2018-10-21 12:40:17,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1011 GetRequests, 791 SyntacticMatches, 120 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19604 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-21 12:40:17,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2018-10-21 12:40:17,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 255. [2018-10-21 12:40:17,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-10-21 12:40:17,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 286 transitions. [2018-10-21 12:40:17,236 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 286 transitions. Word has length 245 [2018-10-21 12:40:17,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:17,236 INFO L481 AbstractCegarLoop]: Abstraction has 255 states and 286 transitions. [2018-10-21 12:40:17,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-21 12:40:17,237 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 286 transitions. [2018-10-21 12:40:17,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-21 12:40:17,238 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:17,238 INFO L375 BasicCegarLoop]: trace histogram [82, 81, 50, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:17,239 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:17,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:17,239 INFO L82 PathProgramCache]: Analyzing trace with hash 970419580, now seen corresponding path program 51 times [2018-10-21 12:40:17,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:17,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:17,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:17,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:17,240 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:17,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4848 proven. 1650 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-21 12:40:17,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:17,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:17,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:17,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:17,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:17,958 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:17,969 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:40:17,969 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:40:18,055 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-21 12:40:18,055 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:18,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:18,094 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:18,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:18,927 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:18,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:18,949 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:18,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:40:18,966 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:40:19,520 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-21 12:40:19,521 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:19,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:19,561 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:19,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:19,908 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:19,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:19,910 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 34, 34, 34, 34] total 52 [2018-10-21 12:40:19,910 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:19,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-21 12:40:19,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-21 12:40:19,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:19,912 INFO L87 Difference]: Start difference. First operand 255 states and 286 transitions. Second operand 36 states. [2018-10-21 12:40:20,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:20,105 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-21 12:40:20,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-21 12:40:20,107 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 254 [2018-10-21 12:40:20,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:20,109 INFO L225 Difference]: With dead ends: 270 [2018-10-21 12:40:20,109 INFO L226 Difference]: Without dead ends: 265 [2018-10-21 12:40:20,110 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 968 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:20,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-21 12:40:20,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 264. [2018-10-21 12:40:20,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2018-10-21 12:40:20,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 298 transitions. [2018-10-21 12:40:20,119 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 298 transitions. Word has length 254 [2018-10-21 12:40:20,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:20,120 INFO L481 AbstractCegarLoop]: Abstraction has 264 states and 298 transitions. [2018-10-21 12:40:20,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-21 12:40:20,120 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 298 transitions. [2018-10-21 12:40:20,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2018-10-21 12:40:20,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:20,121 INFO L375 BasicCegarLoop]: trace histogram [85, 84, 50, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:20,122 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:20,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:20,122 INFO L82 PathProgramCache]: Analyzing trace with hash -629900097, now seen corresponding path program 52 times [2018-10-21 12:40:20,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:20,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:20,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:20,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:20,123 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:20,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:21,066 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 5280 proven. 1962 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-21 12:40:21,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:21,067 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:21,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:21,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:21,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:21,067 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:21,076 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:40:21,077 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:40:21,137 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:40:21,137 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:21,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:22,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:24,055 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:24,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:24,075 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:24,091 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:40:24,092 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:40:24,225 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:40:24,225 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:24,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:24,312 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:24,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:40:26,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:26,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 87, 87, 87, 87] total 102 [2018-10-21 12:40:26,041 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:26,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-10-21 12:40:26,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-10-21 12:40:26,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-21 12:40:26,043 INFO L87 Difference]: Start difference. First operand 264 states and 298 transitions. Second operand 89 states. [2018-10-21 12:40:26,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:26,786 INFO L93 Difference]: Finished difference Result 279 states and 319 transitions. [2018-10-21 12:40:26,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-10-21 12:40:26,789 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 263 [2018-10-21 12:40:26,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:26,792 INFO L225 Difference]: With dead ends: 279 [2018-10-21 12:40:26,792 INFO L226 Difference]: Without dead ends: 274 [2018-10-21 12:40:26,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1089 GetRequests, 845 SyntacticMatches, 144 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22544 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-21 12:40:26,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2018-10-21 12:40:26,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 273. [2018-10-21 12:40:26,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-10-21 12:40:26,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 310 transitions. [2018-10-21 12:40:26,806 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 310 transitions. Word has length 263 [2018-10-21 12:40:26,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:26,806 INFO L481 AbstractCegarLoop]: Abstraction has 273 states and 310 transitions. [2018-10-21 12:40:26,806 INFO L482 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-10-21 12:40:26,806 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 310 transitions. [2018-10-21 12:40:26,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-10-21 12:40:26,808 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:26,808 INFO L375 BasicCegarLoop]: trace histogram [88, 87, 50, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:26,808 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:26,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:26,809 INFO L82 PathProgramCache]: Analyzing trace with hash -682563364, now seen corresponding path program 53 times [2018-10-21 12:40:26,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:26,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:26,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:26,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:26,810 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:26,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:27,684 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5712 proven. 2301 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-21 12:40:27,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:27,685 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:27,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:27,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:27,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:27,685 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:27,694 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:40:27,694 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:40:27,852 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 88 check-sat command(s) [2018-10-21 12:40:27,852 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:27,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:28,229 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5662 proven. 3626 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-21 12:40:28,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:29,187 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5662 proven. 3626 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-21 12:40:29,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:29,208 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:29,224 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:40:29,224 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:40:30,560 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 88 check-sat command(s) [2018-10-21 12:40:30,560 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:30,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5650 proven. 2072 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:30,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:31,659 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5650 proven. 2072 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-21 12:40:31,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:31,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 52, 52, 40, 40] total 52 [2018-10-21 12:40:31,661 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:31,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-21 12:40:31,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-21 12:40:31,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:31,662 INFO L87 Difference]: Start difference. First operand 273 states and 310 transitions. Second operand 52 states. [2018-10-21 12:40:32,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:32,037 INFO L93 Difference]: Finished difference Result 317 states and 379 transitions. [2018-10-21 12:40:32,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-21 12:40:32,040 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 272 [2018-10-21 12:40:32,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:32,042 INFO L225 Difference]: With dead ends: 317 [2018-10-21 12:40:32,042 INFO L226 Difference]: Without dead ends: 312 [2018-10-21 12:40:32,043 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1128 GetRequests, 990 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1928 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:32,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-21 12:40:32,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2018-10-21 12:40:32,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-10-21 12:40:32,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 362 transitions. [2018-10-21 12:40:32,052 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 362 transitions. Word has length 272 [2018-10-21 12:40:32,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:32,053 INFO L481 AbstractCegarLoop]: Abstraction has 312 states and 362 transitions. [2018-10-21 12:40:32,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-21 12:40:32,053 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 362 transitions. [2018-10-21 12:40:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-10-21 12:40:32,054 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:32,055 INFO L375 BasicCegarLoop]: trace histogram [101, 100, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:32,055 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:32,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:32,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1819528257, now seen corresponding path program 54 times [2018-10-21 12:40:32,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:32,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:32,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:32,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:32,056 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:32,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:33,948 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:33,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:33,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:40:33,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:40:33,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:40:33,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:33,949 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:40:33,961 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:40:33,962 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:40:34,177 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 101 check-sat command(s) [2018-10-21 12:40:34,177 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:34,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:34,500 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:34,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:35,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:35,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:40:35,093 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:40:35,113 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:40:35,113 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:40:37,064 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 101 check-sat command(s) [2018-10-21 12:40:37,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:40:37,075 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:40:37,431 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:37,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:40:37,735 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:37,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:40:37,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55, 55, 55] total 57 [2018-10-21 12:40:37,737 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:40:37,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-21 12:40:37,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-21 12:40:37,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-10-21 12:40:37,739 INFO L87 Difference]: Start difference. First operand 312 states and 362 transitions. Second operand 55 states. [2018-10-21 12:40:39,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:39,817 INFO L93 Difference]: Finished difference Result 4294 states and 5669 transitions. [2018-10-21 12:40:39,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-21 12:40:39,820 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 311 [2018-10-21 12:40:39,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:39,839 INFO L225 Difference]: With dead ends: 4294 [2018-10-21 12:40:39,839 INFO L226 Difference]: Without dead ends: 4289 [2018-10-21 12:40:39,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1298 GetRequests, 1232 SyntacticMatches, 10 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=119, Invalid=3187, Unknown=0, NotChecked=0, Total=3306 [2018-10-21 12:40:39,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4289 states. [2018-10-21 12:40:39,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4289 to 315. [2018-10-21 12:40:39,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-10-21 12:40:39,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 366 transitions. [2018-10-21 12:40:39,933 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 366 transitions. Word has length 311 [2018-10-21 12:40:39,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:39,936 INFO L481 AbstractCegarLoop]: Abstraction has 315 states and 366 transitions. [2018-10-21 12:40:39,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-21 12:40:39,936 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 366 transitions. [2018-10-21 12:40:39,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-21 12:40:39,941 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:40:39,941 INFO L375 BasicCegarLoop]: trace histogram [102, 101, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:40:39,941 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:40:39,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:40:39,942 INFO L82 PathProgramCache]: Analyzing trace with hash 908591292, now seen corresponding path program 55 times [2018-10-21 12:40:39,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:40:39,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:39,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:40:39,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:40:39,945 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:40:39,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:40:41,764 INFO L134 CoverageAnalysis]: Checked inductivity of 15352 backedges. 11527 proven. 0 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-21 12:40:41,764 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:40:41,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2018-10-21 12:40:41,765 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:40:41,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-21 12:40:41,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-21 12:40:41,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:41,766 INFO L87 Difference]: Start difference. First operand 315 states and 366 transitions. Second operand 52 states. [2018-10-21 12:40:42,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:40:42,113 INFO L93 Difference]: Finished difference Result 464 states and 564 transitions. [2018-10-21 12:40:42,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-21 12:40:42,115 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 314 [2018-10-21 12:40:42,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:40:42,116 INFO L225 Difference]: With dead ends: 464 [2018-10-21 12:40:42,116 INFO L226 Difference]: Without dead ends: 0 [2018-10-21 12:40:42,118 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-21 12:40:42,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-21 12:40:42,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-21 12:40:42,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-21 12:40:42,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-21 12:40:42,118 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 314 [2018-10-21 12:40:42,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:40:42,119 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-21 12:40:42,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-21 12:40:42,119 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-21 12:40:42,119 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-21 12:40:42,124 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-21 12:40:43,015 WARN L179 SmtUtils]: Spent 872.00 ms on a formula simplification. DAG size of input: 1848 DAG size of output: 407 [2018-10-21 12:40:45,595 WARN L179 SmtUtils]: Spent 2.53 s on a formula simplification. DAG size of input: 407 DAG size of output: 357 [2018-10-21 12:40:45,608 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-21 12:40:45,608 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:40:45,608 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:40:45,608 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-21 12:40:45,608 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-21 12:40:45,608 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-21 12:40:45,609 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 23) the Hoare annotation is: true [2018-10-21 12:40:45,609 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 23) no Hoare annotation was computed. [2018-10-21 12:40:45,609 INFO L425 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-10-21 12:40:45,609 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2018-10-21 12:40:45,609 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 23) no Hoare annotation was computed. [2018-10-21 12:40:45,609 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 20) no Hoare annotation was computed. [2018-10-21 12:40:45,611 INFO L421 ceAbstractionStarter]: At program point L14-2(lines 13 20) the Hoare annotation is: (or (and (and (<= main_~x~0 99) (<= 99 main_~y~0) (<= main_~y~0 99)) (<= 99 main_~x~0)) (and (and (<= main_~y~0 92) (<= 92 main_~y~0) (<= main_~x~0 92)) (<= 92 main_~x~0)) (and (<= 65 main_~x~0) (and (<= main_~y~0 65) (<= 65 main_~y~0) (<= main_~x~0 65))) (and (and (<= main_~y~0 100) (< 99 main_~y~0)) (<= 100 main_~x~0)) (and (<= 64 main_~x~0) (and (<= main_~x~0 64) (<= 64 main_~y~0) (<= main_~y~0 64))) (and (<= 76 main_~x~0) (and (<= main_~y~0 76) (<= main_~x~0 76) (<= 76 main_~y~0))) (and (<= 87 main_~x~0) (and (<= main_~x~0 87) (<= main_~y~0 87) (<= 87 main_~y~0))) (and (and (<= main_~y~0 78) (<= 78 main_~y~0) (<= main_~x~0 78)) (<= 78 main_~x~0)) (and (<= 72 main_~x~0) (and (<= main_~y~0 72) (<= main_~x~0 72) (<= 72 main_~y~0))) (and (and (<= main_~y~0 69) (<= 69 main_~y~0) (<= main_~x~0 69)) (<= 69 main_~x~0)) (and (<= 60 main_~x~0) (and (<= main_~x~0 60) (<= main_~y~0 60) (<= 60 main_~y~0))) (and (<= 67 main_~x~0) (and (<= main_~y~0 67) (<= main_~x~0 67) (<= 67 main_~y~0))) (and (and (<= main_~y~0 55) (<= 55 main_~y~0) (<= main_~x~0 55)) (<= 55 main_~x~0)) (and (and (<= 73 main_~y~0) (<= main_~x~0 73) (<= main_~y~0 73)) (<= 73 main_~x~0)) (and (<= 66 main_~x~0) (and (<= main_~y~0 66) (<= 66 main_~y~0) (<= main_~x~0 66))) (and (and (<= main_~x~0 70) (<= main_~y~0 70) (<= 70 main_~y~0)) (<= 70 main_~x~0)) (and (and (<= main_~x~0 95) (<= main_~y~0 95) (<= 95 main_~y~0)) (<= 95 main_~x~0)) (and (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= main_~x~0 90)) (<= 90 main_~x~0)) (and (and (<= main_~y~0 59) (<= main_~x~0 59) (<= 59 main_~y~0)) (<= 59 main_~x~0)) (and (<= 85 main_~x~0) (and (<= 85 main_~y~0) (<= main_~x~0 85) (<= main_~y~0 85))) (and (<= 63 main_~x~0) (and (<= main_~y~0 63) (<= main_~x~0 63) (<= 63 main_~y~0))) (and (and (<= main_~y~0 77) (<= main_~x~0 77) (<= 77 main_~y~0)) (<= 77 main_~x~0)) (and (<= 53 main_~x~0) (and (<= main_~y~0 53) (<= main_~x~0 53) (<= 53 main_~y~0))) (and (and (<= main_~x~0 79) (<= main_~y~0 79) (<= 79 main_~y~0)) (<= 79 main_~x~0)) (and (<= 68 main_~x~0) (and (<= 68 main_~y~0) (<= main_~y~0 68) (<= main_~x~0 68))) (and (<= 54 main_~x~0) (and (<= main_~x~0 54) (<= 54 main_~y~0) (<= main_~y~0 54))) (and (<= 51 main_~x~0) (and (<= 51 main_~y~0) (<= main_~x~0 51) (<= main_~y~0 51))) (and (and (<= 56 main_~y~0) (<= main_~x~0 56) (<= main_~y~0 56)) (<= 56 main_~x~0)) (and (<= 61 main_~x~0) (and (<= main_~y~0 61) (<= 61 main_~y~0) (<= main_~x~0 61))) (and (<= 88 main_~x~0) (and (<= main_~x~0 88) (<= main_~y~0 88) (<= 88 main_~y~0))) (and (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and (<= 80 main_~x~0) (and (<= main_~x~0 80) (<= 80 main_~y~0) (<= main_~y~0 80))) (and (<= 94 main_~x~0) (and (<= main_~x~0 94) (<= main_~y~0 94) (<= 94 main_~y~0))) (and (<= 89 main_~x~0) (and (<= 89 main_~y~0) (<= main_~y~0 89) (<= main_~x~0 89))) (and (and (<= 86 main_~y~0) (<= main_~x~0 86) (<= main_~y~0 86)) (<= 86 main_~x~0)) (and (<= 58 main_~x~0) (and (<= main_~x~0 58) (<= main_~y~0 58) (<= 58 main_~y~0))) (and (and (<= main_~x~0 91) (<= 91 main_~y~0) (<= main_~y~0 91)) (<= 91 main_~x~0)) (and (and (<= 52 main_~y~0) (<= main_~y~0 52) (<= main_~x~0 52)) (<= 52 main_~x~0)) (and (<= 93 main_~x~0) (and (<= main_~x~0 93) (<= 93 main_~y~0) (<= main_~y~0 93))) (and (<= 74 main_~x~0) (and (<= 74 main_~y~0) (<= main_~y~0 74) (<= main_~x~0 74))) (and (and (<= main_~y~0 71) (<= main_~x~0 71) (<= 71 main_~y~0)) (<= 71 main_~x~0)) (and (<= 57 main_~x~0) (and (<= 57 main_~y~0) (<= main_~x~0 57) (<= main_~y~0 57))) (and (<= 97 main_~x~0) (and (<= 97 main_~y~0) (<= main_~x~0 97) (<= main_~y~0 97))) (and (and (<= main_~x~0 81) (<= 81 main_~y~0) (<= main_~y~0 81)) (<= 81 main_~x~0)) (and (<= 84 main_~x~0) (and (<= main_~y~0 84) (<= 84 main_~y~0) (<= main_~x~0 84))) (and (and (<= 96 main_~y~0) (<= main_~x~0 96) (<= main_~y~0 96)) (<= 96 main_~x~0)) (and (<= 83 main_~x~0) (and (<= main_~y~0 83) (<= 83 main_~y~0) (<= main_~x~0 83))) (and (<= 62 main_~x~0) (and (<= main_~y~0 62) (<= main_~x~0 62) (<= 62 main_~y~0))) (and (and (<= main_~x~0 98) (<= main_~y~0 98) (<= 98 main_~y~0)) (<= 98 main_~x~0)) (and (and (<= 75 main_~y~0) (<= main_~x~0 75) (<= main_~y~0 75)) (<= 75 main_~x~0)) (and (and (<= 82 main_~y~0) (<= main_~y~0 82) (<= main_~x~0 82)) (<= 82 main_~x~0))) [2018-10-21 12:40:45,611 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 20) the Hoare annotation is: (and (<= main_~y~0 100) (< 99 main_~y~0)) [2018-10-21 12:40:45,612 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-21 12:40:45,614 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-21 12:40:45,614 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:40:45,614 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-21 12:40:45,614 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-21 12:40:45,614 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:40:45,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:40:45 BoogieIcfgContainer [2018-10-21 12:40:45,647 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:40:45,647 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:40:45,647 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:40:45,647 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:40:45,648 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:38:09" (3/4) ... [2018-10-21 12:40:45,659 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-21 12:40:45,666 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-21 12:40:45,667 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-21 12:40:45,667 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-21 12:40:45,673 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2018-10-21 12:40:45,673 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-10-21 12:40:45,673 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-21 12:40:45,713 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:40:45,714 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:40:45,715 INFO L168 Benchmark]: Toolchain (without parser) took 156631.03 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 414.2 MB). Free memory was 954.5 MB in the beginning and 1.2 GB in the end (delta: -210.1 MB). Peak memory consumption was 204.1 MB. Max. memory is 11.5 GB. [2018-10-21 12:40:45,717 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:40:45,717 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.26 ms. Allocated memory is still 1.0 GB. Free memory was 954.5 MB in the beginning and 943.8 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:40:45,718 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.92 ms. Allocated memory is still 1.0 GB. Free memory is still 943.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:40:45,718 INFO L168 Benchmark]: Boogie Preprocessor took 24.79 ms. Allocated memory is still 1.0 GB. Free memory is still 943.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:40:45,718 INFO L168 Benchmark]: RCFGBuilder took 541.36 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 155.7 MB). Free memory was 943.8 MB in the beginning and 1.1 GB in the end (delta: -188.5 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. [2018-10-21 12:40:45,725 INFO L168 Benchmark]: TraceAbstraction took 155681.61 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 258.5 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -32.4 MB). Peak memory consumption was 610.3 MB. Max. memory is 11.5 GB. [2018-10-21 12:40:45,726 INFO L168 Benchmark]: Witness Printer took 67.53 ms. Allocated memory is still 1.4 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:40:45,731 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 288.26 ms. Allocated memory is still 1.0 GB. Free memory was 954.5 MB in the beginning and 943.8 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 21.92 ms. Allocated memory is still 1.0 GB. Free memory is still 943.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 24.79 ms. Allocated memory is still 1.0 GB. Free memory is still 943.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 541.36 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 155.7 MB). Free memory was 943.8 MB in the beginning and 1.1 GB in the end (delta: -188.5 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 155681.61 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 258.5 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -32.4 MB). Peak memory consumption was 610.3 MB. Max. memory is 11.5 GB. * Witness Printer took 67.53 ms. Allocated memory is still 1.4 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - 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: 13]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((x <= 99 && 99 <= y) && y <= 99) && 99 <= x) || (((y <= 92 && 92 <= y) && x <= 92) && 92 <= x)) || (65 <= x && (y <= 65 && 65 <= y) && x <= 65)) || ((y <= 100 && 99 < y) && 100 <= x)) || (64 <= x && (x <= 64 && 64 <= y) && y <= 64)) || (76 <= x && (y <= 76 && x <= 76) && 76 <= y)) || (87 <= x && (x <= 87 && y <= 87) && 87 <= y)) || (((y <= 78 && 78 <= y) && x <= 78) && 78 <= x)) || (72 <= x && (y <= 72 && x <= 72) && 72 <= y)) || (((y <= 69 && 69 <= y) && x <= 69) && 69 <= x)) || (60 <= x && (x <= 60 && y <= 60) && 60 <= y)) || (67 <= x && (y <= 67 && x <= 67) && 67 <= y)) || (((y <= 55 && 55 <= y) && x <= 55) && 55 <= x)) || (((73 <= y && x <= 73) && y <= 73) && 73 <= x)) || (66 <= x && (y <= 66 && 66 <= y) && x <= 66)) || (((x <= 70 && y <= 70) && 70 <= y) && 70 <= x)) || (((x <= 95 && y <= 95) && 95 <= y) && 95 <= x)) || (((90 <= y && y <= 90) && x <= 90) && 90 <= x)) || (((y <= 59 && x <= 59) && 59 <= y) && 59 <= x)) || (85 <= x && (85 <= y && x <= 85) && y <= 85)) || (63 <= x && (y <= 63 && x <= 63) && 63 <= y)) || (((y <= 77 && x <= 77) && 77 <= y) && 77 <= x)) || (53 <= x && (y <= 53 && x <= 53) && 53 <= y)) || (((x <= 79 && y <= 79) && 79 <= y) && 79 <= x)) || (68 <= x && (68 <= y && y <= 68) && x <= 68)) || (54 <= x && (x <= 54 && 54 <= y) && y <= 54)) || (51 <= x && (51 <= y && x <= 51) && y <= 51)) || (((56 <= y && x <= 56) && y <= 56) && 56 <= x)) || (61 <= x && (y <= 61 && 61 <= y) && x <= 61)) || (88 <= x && (x <= 88 && y <= 88) && 88 <= y)) || ((y <= 50 && x <= 50) && 50 <= y)) || (80 <= x && (x <= 80 && 80 <= y) && y <= 80)) || (94 <= x && (x <= 94 && y <= 94) && 94 <= y)) || (89 <= x && (89 <= y && y <= 89) && x <= 89)) || (((86 <= y && x <= 86) && y <= 86) && 86 <= x)) || (58 <= x && (x <= 58 && y <= 58) && 58 <= y)) || (((x <= 91 && 91 <= y) && y <= 91) && 91 <= x)) || (((52 <= y && y <= 52) && x <= 52) && 52 <= x)) || (93 <= x && (x <= 93 && 93 <= y) && y <= 93)) || (74 <= x && (74 <= y && y <= 74) && x <= 74)) || (((y <= 71 && x <= 71) && 71 <= y) && 71 <= x)) || (57 <= x && (57 <= y && x <= 57) && y <= 57)) || (97 <= x && (97 <= y && x <= 97) && y <= 97)) || (((x <= 81 && 81 <= y) && y <= 81) && 81 <= x)) || (84 <= x && (y <= 84 && 84 <= y) && x <= 84)) || (((96 <= y && x <= 96) && y <= 96) && 96 <= x)) || (83 <= x && (y <= 83 && 83 <= y) && x <= 83)) || (62 <= x && (y <= 62 && x <= 62) && 62 <= y)) || (((x <= 98 && y <= 98) && 98 <= y) && 98 <= x)) || (((75 <= y && x <= 75) && y <= 75) && 75 <= x)) || (((82 <= y && y <= 82) && x <= 82) && 82 <= x) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 155.5s OverallTime, 58 OverallIterations, 102 TraceHistogramMax, 16.2s AutomataDifference, 0.0s DeadEndRemovalTime, 3.4s HoareAnnotationTime, HoareTripleCheckerStatistics: 887 SDtfs, 707 SDslu, 16816 SDs, 0 SdLazy, 8342 SolverSat, 1401 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 11.3s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 33760 GetRequests, 29736 SyntacticMatches, 1526 SemanticMatches, 2498 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72565 ImplicationChecksByTransitivity, 101.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=315occurred in iteration=57, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 1.0 AbsIntWeakeningRatio, 0.3076923076923077 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 58 MinimizatonAttempts, 3990 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 64 PreInvPairs, 166 NumberOfFragments, 720 HoareAnnotationTreeSize, 64 FomulaSimplifications, 18367 FormulaSimplificationTreeSizeReduction, 0.8s HoareSimplificationTime, 7 FomulaSimplificationsInter, 200 FormulaSimplificationTreeSizeReductionInter, 2.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.5s SsaConstructionTime, 19.2s SatisfiabilityAnalysisTime, 110.4s InterpolantComputationTime, 24514 NumberOfCodeBlocks, 23530 NumberOfCodeBlocksAsserted, 2454 NumberOfCheckSat, 40350 ConstructedInterpolants, 0 QuantifiedInterpolants, 18639222 SizeOfPredicates, 56 NumberOfNonLiveVariables, 29946 ConjunctsInSsa, 3249 ConjunctsInUnsatCore, 274 InterpolantComputations, 3 PerfectInterpolantSequences, 700096/1151304 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...