java -Xmx8000000000 -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 ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:34:06,569 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:34:06,571 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:34:06,583 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:34:06,583 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:34:06,588 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:34:06,589 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:34:06,591 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:34:06,594 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:34:06,598 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:34:06,600 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:34:06,600 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:34:06,601 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:34:06,604 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:34:06,609 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:34:06,610 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:34:06,611 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:34:06,613 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:34:06,615 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:34:06,616 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:34:06,618 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:34:06,619 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:34:06,622 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:34:06,622 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:34:06,622 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:34:06,623 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:34:06,624 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:34:06,625 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:34:06,626 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:34:06,627 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:34:06,628 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:34:06,628 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:34:06,631 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:34:06,647 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:34:06,647 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:34:06,648 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:34:06,648 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:34:06,648 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:34:06,648 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:34:06,649 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:34:06,649 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:34:06,649 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:34:06,649 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:34:06,649 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:34:06,650 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:34:06,650 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:34:06,650 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:34:06,651 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:34:06,651 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:34:06,651 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:34:06,652 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:34:06,652 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:34:06,652 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:34:06,653 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:34:06,653 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:34:06,653 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:34:06,653 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:34:06,653 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:34:06,654 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:34:06,654 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:34:06,654 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:34:06,654 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:34:06,654 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:34:06,655 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:34:06,656 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:34:06,656 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:34:06,656 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:34:06,656 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:34:06,656 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:34:06,728 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:34:06,746 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:34:06,751 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:34:06,753 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:34:06,754 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:34:06,755 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple_true-unreach-call_true-termination.i [2018-10-24 12:34:06,826 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a90213b57/910ee332e3fe40ef9f054ffd7df29a11/FLAG4402151e2 [2018-10-24 12:34:07,250 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:34:07,251 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple_true-unreach-call_true-termination.i [2018-10-24 12:34:07,258 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a90213b57/910ee332e3fe40ef9f054ffd7df29a11/FLAG4402151e2 [2018-10-24 12:34:07,273 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a90213b57/910ee332e3fe40ef9f054ffd7df29a11 [2018-10-24 12:34:07,285 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:34:07,287 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:34:07,291 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:07,291 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:34:07,298 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:34:07,300 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,303 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a443da6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07, skipping insertion in model container [2018-10-24 12:34:07,304 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,315 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:34:07,345 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:34:07,586 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:07,590 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:34:07,616 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:07,635 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:34:07,636 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07 WrapperNode [2018-10-24 12:34:07,636 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:07,637 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:07,638 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:34:07,638 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:34:07,650 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,657 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,664 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:07,665 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:34:07,665 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:34:07,665 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:34:07,676 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,678 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,678 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,685 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,695 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,697 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (1/1) ... [2018-10-24 12:34:07,706 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:34:07,707 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:34:07,707 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:34:07,707 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:34:07,708 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (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 [2018-10-24 12:34:07,857 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:34:07,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:34:07,858 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:34:07,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:34:07,858 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:34:07,858 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:34:07,859 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:34:07,859 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:34:08,225 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:34:08,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:08 BoogieIcfgContainer [2018-10-24 12:34:08,226 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:34:08,227 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:34:08,227 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:34:08,231 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:34:08,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:34:07" (1/3) ... [2018-10-24 12:34:08,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4985c303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:08, skipping insertion in model container [2018-10-24 12:34:08,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:07" (2/3) ... [2018-10-24 12:34:08,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4985c303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:08, skipping insertion in model container [2018-10-24 12:34:08,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:08" (3/3) ... [2018-10-24 12:34:08,234 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple_true-unreach-call_true-termination.i [2018-10-24 12:34:08,247 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:34:08,257 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:34:08,277 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:34:08,320 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:34:08,320 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:34:08,321 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:34:08,321 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:34:08,321 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:34:08,321 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:34:08,321 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:34:08,322 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:34:08,363 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2018-10-24 12:34:08,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:34:08,370 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:08,371 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:08,374 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:08,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:08,379 INFO L82 PathProgramCache]: Analyzing trace with hash 62896836, now seen corresponding path program 1 times [2018-10-24 12:34:08,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:08,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:08,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:08,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:08,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:08,499 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:08,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:34:08,500 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:08,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:34:08,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:34:08,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:34:08,522 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 2 states. [2018-10-24 12:34:08,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:08,546 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2018-10-24 12:34:08,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:34:08,548 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2018-10-24 12:34:08,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:08,558 INFO L225 Difference]: With dead ends: 52 [2018-10-24 12:34:08,558 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:34:08,562 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 [2018-10-24 12:34:08,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:34:08,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-24 12:34:08,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:34:08,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2018-10-24 12:34:08,603 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2018-10-24 12:34:08,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:08,604 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2018-10-24 12:34:08,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:34:08,605 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2018-10-24 12:34:08,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:34:08,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:08,606 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:08,606 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:08,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:08,607 INFO L82 PathProgramCache]: Analyzing trace with hash -111227420, now seen corresponding path program 1 times [2018-10-24 12:34:08,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:08,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:08,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:08,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:08,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:08,932 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:08,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:34:08,932 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:08,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:34:08,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:34:08,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:34:08,935 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2018-10-24 12:34:09,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:09,078 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:34:09,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:34:09,079 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-24 12:34:09,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:09,081 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:34:09,081 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:34:09,082 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:34:09,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:34:09,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:34:09,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:34:09,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2018-10-24 12:34:09,092 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 20 [2018-10-24 12:34:09,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:09,093 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2018-10-24 12:34:09,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:34:09,093 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2018-10-24 12:34:09,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:34:09,094 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:09,094 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:09,095 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:09,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:09,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1352658359, now seen corresponding path program 1 times [2018-10-24 12:34:09,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:09,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:09,097 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:09,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:09,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:09,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:09,185 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:09,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:34:09,186 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:09,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:34:09,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:34:09,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:34:09,188 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 5 states. [2018-10-24 12:34:09,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:09,583 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2018-10-24 12:34:09,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:34:09,584 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2018-10-24 12:34:09,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:09,588 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:34:09,588 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:34:09,589 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:09,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:34:09,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2018-10-24 12:34:09,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:34:09,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-10-24 12:34:09,602 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 29 [2018-10-24 12:34:09,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:09,602 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-10-24 12:34:09,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:34:09,603 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-10-24 12:34:09,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:34:09,604 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:09,604 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:09,604 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:09,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:09,605 INFO L82 PathProgramCache]: Analyzing trace with hash -38707475, now seen corresponding path program 1 times [2018-10-24 12:34:09,605 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:09,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:09,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:09,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:09,607 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:09,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:09,753 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:09,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:09,753 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:09,754 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 33 with the following transitions: [2018-10-24 12:34:09,756 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [10], [13], [21], [25], [29], [31], [34], [36], [40], [44], [50], [52], [57], [63], [66], [68], [71], [73], [74], [75], [76], [78], [79] [2018-10-24 12:34:09,792 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:09,792 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:10,064 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:10,065 INFO L272 AbstractInterpreter]: Visited 26 different actions 80 times. Merged at 10 different actions 28 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 9 variables. [2018-10-24 12:34:10,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:10,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:10,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:10,080 INFO L194 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 [2018-10-24 12:34:10,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:10,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:10,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:10,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:10,396 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:10,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:10,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:10,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 13 [2018-10-24 12:34:10,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:10,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:34:10,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:34:10,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:10,579 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 11 states. [2018-10-24 12:34:11,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:11,365 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2018-10-24 12:34:11,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:34:11,366 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2018-10-24 12:34:11,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:11,368 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:34:11,368 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:34:11,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:11,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:34:11,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 45. [2018-10-24 12:34:11,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:34:11,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2018-10-24 12:34:11,380 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 32 [2018-10-24 12:34:11,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:11,380 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2018-10-24 12:34:11,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:34:11,380 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2018-10-24 12:34:11,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:34:11,383 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:11,383 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:11,384 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:11,384 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:11,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1515908604, now seen corresponding path program 2 times [2018-10-24 12:34:11,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:11,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:11,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:11,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:11,553 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:34:11,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:11,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:11,554 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:11,554 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:11,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:11,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:11,570 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:11,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:11,608 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:34:11,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:11,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:11,818 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:11,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:12,003 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:12,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:12,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2018-10-24 12:34:12,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:12,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:12,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:12,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:12,028 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 14 states. [2018-10-24 12:34:12,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:12,509 INFO L93 Difference]: Finished difference Result 92 states and 107 transitions. [2018-10-24 12:34:12,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:34:12,510 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:34:12,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:12,513 INFO L225 Difference]: With dead ends: 92 [2018-10-24 12:34:12,513 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:34:12,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:12,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:34:12,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 53. [2018-10-24 12:34:12,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:34:12,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2018-10-24 12:34:12,525 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 44 [2018-10-24 12:34:12,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:12,526 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2018-10-24 12:34:12,526 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:12,526 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2018-10-24 12:34:12,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:34:12,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:12,528 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:12,528 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:12,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:12,529 INFO L82 PathProgramCache]: Analyzing trace with hash 775099085, now seen corresponding path program 3 times [2018-10-24 12:34:12,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:12,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:12,530 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:12,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:12,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:12,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:12,805 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 30 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:12,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,805 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:12,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:12,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:12,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,806 INFO L194 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 [2018-10-24 12:34:12,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:12,822 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:12,850 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:12,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:12,855 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:12,974 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 30 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:12,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:13,083 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 30 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:13,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:13,107 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 14 [2018-10-24 12:34:13,107 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:13,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:13,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:13,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:34:13,109 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 14 states. [2018-10-24 12:34:13,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:13,451 INFO L93 Difference]: Finished difference Result 103 states and 120 transitions. [2018-10-24 12:34:13,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:34:13,452 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 56 [2018-10-24 12:34:13,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:13,454 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:34:13,454 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:34:13,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 102 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:34:13,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:34:13,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 56. [2018-10-24 12:34:13,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:34:13,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-10-24 12:34:13,464 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 56 [2018-10-24 12:34:13,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:13,465 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-10-24 12:34:13,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:13,465 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-10-24 12:34:13,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:34:13,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:13,466 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:13,467 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:13,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:13,467 INFO L82 PathProgramCache]: Analyzing trace with hash -916783191, now seen corresponding path program 4 times [2018-10-24 12:34:13,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:13,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:13,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:13,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:13,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:13,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:13,618 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 35 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:34:13,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:13,618 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:13,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:13,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:13,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:13,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:13,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:13,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:13,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:13,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:13,702 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 36 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:13,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 36 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:13,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:13,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 13 [2018-10-24 12:34:13,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:13,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:34:13,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:34:13,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:13,830 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 12 states. [2018-10-24 12:34:13,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:13,994 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2018-10-24 12:34:13,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:13,995 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 59 [2018-10-24 12:34:13,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:13,997 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:34:13,997 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:34:13,998 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 114 SyntacticMatches, 7 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:34:13,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:34:14,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2018-10-24 12:34:14,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:34:14,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2018-10-24 12:34:14,008 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 59 [2018-10-24 12:34:14,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:14,009 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2018-10-24 12:34:14,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:34:14,009 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2018-10-24 12:34:14,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:34:14,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:14,011 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:14,011 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:14,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:14,012 INFO L82 PathProgramCache]: Analyzing trace with hash 928258569, now seen corresponding path program 5 times [2018-10-24 12:34:14,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:14,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:14,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:14,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:14,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:14,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:14,216 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 75 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:14,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,217 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:14,217 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:14,217 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:14,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,217 INFO L194 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 [2018-10-24 12:34:14,225 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:14,226 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:14,268 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:34:14,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:14,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:14,577 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 75 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:14,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:14,754 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 75 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:14,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:14,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2018-10-24 12:34:14,777 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:14,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:34:14,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:34:14,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:14,779 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand 19 states. [2018-10-24 12:34:15,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:15,285 INFO L93 Difference]: Finished difference Result 135 states and 156 transitions. [2018-10-24 12:34:15,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:34:15,285 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 77 [2018-10-24 12:34:15,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:15,287 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:34:15,287 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:34:15,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 139 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=192, Invalid=458, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:15,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:34:15,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 71. [2018-10-24 12:34:15,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:34:15,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 77 transitions. [2018-10-24 12:34:15,299 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 77 transitions. Word has length 77 [2018-10-24 12:34:15,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:15,299 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 77 transitions. [2018-10-24 12:34:15,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:34:15,300 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 77 transitions. [2018-10-24 12:34:15,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-24 12:34:15,301 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:15,301 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:15,301 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:15,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:15,302 INFO L82 PathProgramCache]: Analyzing trace with hash -846983507, now seen corresponding path program 6 times [2018-10-24 12:34:15,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:15,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:15,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:15,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:15,303 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:15,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:15,602 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 75 proven. 45 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:15,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:15,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:15,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:15,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:15,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:15,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:15,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:15,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:15,671 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:15,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:15,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:16,063 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 75 proven. 45 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:16,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:16,180 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 75 proven. 45 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:16,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:16,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 20 [2018-10-24 12:34:16,202 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:16,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:34:16,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:34:16,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:16,203 INFO L87 Difference]: Start difference. First operand 71 states and 77 transitions. Second operand 20 states. [2018-10-24 12:34:16,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:16,694 INFO L93 Difference]: Finished difference Result 141 states and 165 transitions. [2018-10-24 12:34:16,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:34:16,695 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 80 [2018-10-24 12:34:16,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:16,696 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:34:16,696 INFO L226 Difference]: Without dead ends: 104 [2018-10-24 12:34:16,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 144 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:16,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-10-24 12:34:16,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 74. [2018-10-24 12:34:16,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:34:16,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2018-10-24 12:34:16,709 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 80 [2018-10-24 12:34:16,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:16,709 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2018-10-24 12:34:16,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:34:16,709 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2018-10-24 12:34:16,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:34:16,711 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:16,711 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:16,711 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:16,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:16,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1143613321, now seen corresponding path program 7 times [2018-10-24 12:34:16,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:16,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:16,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,713 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:16,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:17,053 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 72 proven. 78 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:34:17,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:17,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:17,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:17,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:17,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:17,054 INFO L194 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 [2018-10-24 12:34:17,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:17,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:17,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:17,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:17,295 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 73 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:17,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:17,568 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 73 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:17,589 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:17,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 15 [2018-10-24 12:34:17,590 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:17,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:17,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:17,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:34:17,591 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 14 states. [2018-10-24 12:34:17,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:17,755 INFO L93 Difference]: Finished difference Result 90 states and 97 transitions. [2018-10-24 12:34:17,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:17,756 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 83 [2018-10-24 12:34:17,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:17,758 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:34:17,758 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:34:17,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 160 SyntacticMatches, 11 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:17,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:34:17,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-24 12:34:17,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-24 12:34:17,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2018-10-24 12:34:17,770 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 83 [2018-10-24 12:34:17,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:17,771 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2018-10-24 12:34:17,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:17,771 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2018-10-24 12:34:17,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:34:17,773 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:17,773 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:17,773 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:17,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:17,773 INFO L82 PathProgramCache]: Analyzing trace with hash 643631593, now seen corresponding path program 8 times [2018-10-24 12:34:17,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:17,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:17,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:17,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:17,775 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:17,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 140 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:18,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:18,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:18,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:18,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:18,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:18,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:18,531 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:18,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:18,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:34:18,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:18,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:18,942 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 140 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:18,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:19,130 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 140 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:19,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:19,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2018-10-24 12:34:19,153 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:19,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:34:19,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:34:19,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:19,154 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand 25 states. [2018-10-24 12:34:19,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:19,674 INFO L93 Difference]: Finished difference Result 175 states and 203 transitions. [2018-10-24 12:34:19,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:34:19,675 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 101 [2018-10-24 12:34:19,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:19,676 INFO L225 Difference]: With dead ends: 175 [2018-10-24 12:34:19,676 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:34:19,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 181 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=320, Invalid=802, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:34:19,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:34:19,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 91. [2018-10-24 12:34:19,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-10-24 12:34:19,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-10-24 12:34:19,687 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 101 [2018-10-24 12:34:19,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:19,688 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-10-24 12:34:19,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:34:19,688 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-10-24 12:34:19,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:34:19,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:19,690 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:19,690 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:19,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:19,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1746775411, now seen corresponding path program 9 times [2018-10-24 12:34:19,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:19,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:19,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:19,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:19,692 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:19,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:19,906 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 140 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:19,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:19,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:19,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:19,907 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:19,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:19,907 INFO L194 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 [2018-10-24 12:34:19,916 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:19,916 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:19,951 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:19,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:19,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:20,332 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 140 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:20,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:20,516 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 140 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:20,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:20,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 26 [2018-10-24 12:34:20,539 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:20,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:34:20,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:34:20,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:20,540 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 26 states. [2018-10-24 12:34:21,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:21,024 INFO L93 Difference]: Finished difference Result 181 states and 212 transitions. [2018-10-24 12:34:21,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:34:21,024 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 104 [2018-10-24 12:34:21,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:21,026 INFO L225 Difference]: With dead ends: 181 [2018-10-24 12:34:21,026 INFO L226 Difference]: Without dead ends: 134 [2018-10-24 12:34:21,027 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 186 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:34:21,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-10-24 12:34:21,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 94. [2018-10-24 12:34:21,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-24 12:34:21,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2018-10-24 12:34:21,037 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 104 [2018-10-24 12:34:21,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:21,037 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2018-10-24 12:34:21,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:34:21,037 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2018-10-24 12:34:21,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-24 12:34:21,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:21,039 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:21,039 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:21,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:21,040 INFO L82 PathProgramCache]: Analyzing trace with hash 490903401, now seen corresponding path program 10 times [2018-10-24 12:34:21,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:21,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:21,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,041 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:21,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:21,333 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 121 proven. 145 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:34:21,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:21,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:21,334 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:21,334 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:21,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:21,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:21,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:21,344 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:21,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:21,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:21,480 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 122 proven. 126 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:21,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:21,605 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 122 proven. 126 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:21,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:21,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 17 [2018-10-24 12:34:21,627 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:21,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:34:21,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:34:21,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:21,629 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 16 states. [2018-10-24 12:34:21,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:21,808 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2018-10-24 12:34:21,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:21,810 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 107 [2018-10-24 12:34:21,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:21,811 INFO L225 Difference]: With dead ends: 110 [2018-10-24 12:34:21,811 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:34:21,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:21,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:34:21,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2018-10-24 12:34:21,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-24 12:34:21,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2018-10-24 12:34:21,825 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 107 [2018-10-24 12:34:21,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:21,825 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2018-10-24 12:34:21,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:34:21,826 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2018-10-24 12:34:21,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:34:21,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:21,827 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:21,828 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:21,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:21,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1091747383, now seen corresponding path program 11 times [2018-10-24 12:34:21,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:21,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:21,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:21,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:22,257 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 225 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:22,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:22,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:22,258 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:22,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:22,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:22,258 INFO L194 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 [2018-10-24 12:34:22,269 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:22,269 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:22,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:34:22,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:22,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 225 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:22,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:22,867 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 225 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:22,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:22,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2018-10-24 12:34:22,888 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:22,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:34:22,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:34:22,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=783, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:34:22,890 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 31 states. [2018-10-24 12:34:23,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:23,297 INFO L93 Difference]: Finished difference Result 215 states and 250 transitions. [2018-10-24 12:34:23,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:34:23,298 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 125 [2018-10-24 12:34:23,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:23,300 INFO L225 Difference]: With dead ends: 215 [2018-10-24 12:34:23,300 INFO L226 Difference]: Without dead ends: 156 [2018-10-24 12:34:23,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 223 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=480, Invalid=1242, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:34:23,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-10-24 12:34:23,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 111. [2018-10-24 12:34:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:34:23,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 119 transitions. [2018-10-24 12:34:23,311 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 119 transitions. Word has length 125 [2018-10-24 12:34:23,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:23,311 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 119 transitions. [2018-10-24 12:34:23,311 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:34:23,311 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 119 transitions. [2018-10-24 12:34:23,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-24 12:34:23,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:23,313 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:23,313 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:23,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:23,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1980489325, now seen corresponding path program 12 times [2018-10-24 12:34:23,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:23,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:23,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:23,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:23,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:23,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:23,618 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 225 proven. 135 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:23,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:23,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:23,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:23,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:23,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:23,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:23,629 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:23,629 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:23,670 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:23,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:23,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:23,993 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 225 proven. 135 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:23,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:24,172 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 225 proven. 135 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:24,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:24,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 32 [2018-10-24 12:34:24,194 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:24,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:34:24,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:34:24,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:34:24,195 INFO L87 Difference]: Start difference. First operand 111 states and 119 transitions. Second operand 32 states. [2018-10-24 12:34:24,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:24,920 INFO L93 Difference]: Finished difference Result 221 states and 259 transitions. [2018-10-24 12:34:24,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:34:24,921 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 128 [2018-10-24 12:34:24,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:24,923 INFO L225 Difference]: With dead ends: 221 [2018-10-24 12:34:24,923 INFO L226 Difference]: Without dead ends: 164 [2018-10-24 12:34:24,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 228 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:34:24,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-24 12:34:24,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 114. [2018-10-24 12:34:24,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-24 12:34:24,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2018-10-24 12:34:24,933 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 128 [2018-10-24 12:34:24,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:24,934 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2018-10-24 12:34:24,934 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:34:24,934 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2018-10-24 12:34:24,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:34:24,935 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:24,935 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:24,935 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:24,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:24,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1231179593, now seen corresponding path program 13 times [2018-10-24 12:34:24,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:24,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:24,937 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:24,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:24,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:24,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:25,222 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 182 proven. 232 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:34:25,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:25,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:25,222 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:25,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:25,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:25,223 INFO L194 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 [2018-10-24 12:34:25,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:25,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:25,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:25,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:25,348 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 183 proven. 207 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:25,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:25,504 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 183 proven. 207 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:25,524 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:25,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 19 [2018-10-24 12:34:25,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:25,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:34:25,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:34:25,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:25,526 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand 18 states. [2018-10-24 12:34:25,818 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2018-10-24 12:34:25,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:25,934 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-24 12:34:25,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:34:25,935 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-10-24 12:34:25,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:25,937 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:34:25,938 INFO L226 Difference]: Without dead ends: 128 [2018-10-24 12:34:25,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 252 SyntacticMatches, 19 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:25,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-24 12:34:25,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2018-10-24 12:34:25,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:34:25,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2018-10-24 12:34:25,947 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 131 [2018-10-24 12:34:25,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:25,947 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2018-10-24 12:34:25,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:34:25,948 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2018-10-24 12:34:25,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-24 12:34:25,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:25,949 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:25,949 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:25,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:25,949 INFO L82 PathProgramCache]: Analyzing trace with hash -2109554263, now seen corresponding path program 14 times [2018-10-24 12:34:25,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:25,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:25,950 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:25,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:25,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:25,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:26,523 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 330 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:26,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:26,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:26,524 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:26,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:26,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:26,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:26,534 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:26,534 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:26,592 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:34:26,592 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:26,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:27,117 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 330 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:27,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:27,521 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 330 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:27,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:27,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2018-10-24 12:34:27,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:27,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:34:27,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:34:27,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=1107, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:34:27,545 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 37 states. [2018-10-24 12:34:28,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:28,581 INFO L93 Difference]: Finished difference Result 255 states and 297 transitions. [2018-10-24 12:34:28,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:34:28,582 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 149 [2018-10-24 12:34:28,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:28,585 INFO L225 Difference]: With dead ends: 255 [2018-10-24 12:34:28,585 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:34:28,586 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 265 SyntacticMatches, 20 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=672, Invalid=1778, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:34:28,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:34:28,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 131. [2018-10-24 12:34:28,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-24 12:34:28,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 140 transitions. [2018-10-24 12:34:28,596 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 140 transitions. Word has length 149 [2018-10-24 12:34:28,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:28,596 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 140 transitions. [2018-10-24 12:34:28,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:34:28,596 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 140 transitions. [2018-10-24 12:34:28,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-24 12:34:28,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:28,598 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:28,598 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:28,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:28,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1564389965, now seen corresponding path program 15 times [2018-10-24 12:34:28,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:28,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:28,599 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:28,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:28,599 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:28,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:29,440 INFO L134 CoverageAnalysis]: Checked inductivity of 748 backedges. 330 proven. 198 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:29,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:29,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:29,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:29,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:29,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:29,441 INFO L194 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 [2018-10-24 12:34:29,449 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:29,450 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:29,497 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:29,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:29,501 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:30,137 INFO L134 CoverageAnalysis]: Checked inductivity of 748 backedges. 330 proven. 198 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:30,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 748 backedges. 330 proven. 198 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:30,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:30,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 38 [2018-10-24 12:34:30,459 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:30,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:34:30,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:34:30,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:34:30,461 INFO L87 Difference]: Start difference. First operand 131 states and 140 transitions. Second operand 38 states. [2018-10-24 12:34:30,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:30,999 INFO L93 Difference]: Finished difference Result 261 states and 306 transitions. [2018-10-24 12:34:30,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:34:30,999 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 152 [2018-10-24 12:34:31,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:31,002 INFO L225 Difference]: With dead ends: 261 [2018-10-24 12:34:31,002 INFO L226 Difference]: Without dead ends: 194 [2018-10-24 12:34:31,003 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 270 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:34:31,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-10-24 12:34:31,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 134. [2018-10-24 12:34:31,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-10-24 12:34:31,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 143 transitions. [2018-10-24 12:34:31,013 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 143 transitions. Word has length 152 [2018-10-24 12:34:31,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:31,013 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 143 transitions. [2018-10-24 12:34:31,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:34:31,014 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 143 transitions. [2018-10-24 12:34:31,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:34:31,015 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:31,015 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:31,015 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:31,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:31,015 INFO L82 PathProgramCache]: Analyzing trace with hash -909684951, now seen corresponding path program 16 times [2018-10-24 12:34:31,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:31,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:31,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:31,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:31,017 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:31,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:31,266 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 255 proven. 339 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:34:31,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:31,266 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:31,266 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:31,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:31,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:31,266 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:31,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:31,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:31,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:31,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:31,393 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 256 proven. 308 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:31,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 256 proven. 308 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:31,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:31,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 21 [2018-10-24 12:34:31,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:31,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:34:31,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:34:31,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:31,643 INFO L87 Difference]: Start difference. First operand 134 states and 143 transitions. Second operand 20 states. [2018-10-24 12:34:32,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:32,098 INFO L93 Difference]: Finished difference Result 150 states and 160 transitions. [2018-10-24 12:34:32,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:34:32,100 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 155 [2018-10-24 12:34:32,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:32,101 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:34:32,101 INFO L226 Difference]: Without dead ends: 148 [2018-10-24 12:34:32,101 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 298 SyntacticMatches, 23 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:32,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-24 12:34:32,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-10-24 12:34:32,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-24 12:34:32,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 158 transitions. [2018-10-24 12:34:32,110 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 158 transitions. Word has length 155 [2018-10-24 12:34:32,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:32,111 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 158 transitions. [2018-10-24 12:34:32,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:34:32,111 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 158 transitions. [2018-10-24 12:34:32,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-24 12:34:32,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:32,112 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:32,112 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:32,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:32,113 INFO L82 PathProgramCache]: Analyzing trace with hash -568620663, now seen corresponding path program 17 times [2018-10-24 12:34:32,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:32,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:32,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:32,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:32,114 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:32,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:32,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 455 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:32,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,746 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:32,746 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:32,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:32,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,746 INFO L194 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 [2018-10-24 12:34:32,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:32,754 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:32,820 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:34:32,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:32,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:33,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 455 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:33,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:33,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 455 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:33,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:33,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2018-10-24 12:34:33,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:33,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:34:33,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:34:33,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=1487, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:34:33,752 INFO L87 Difference]: Start difference. First operand 148 states and 158 transitions. Second operand 43 states. [2018-10-24 12:34:35,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:35,624 INFO L93 Difference]: Finished difference Result 295 states and 344 transitions. [2018-10-24 12:34:35,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:34:35,625 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 173 [2018-10-24 12:34:35,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:35,627 INFO L225 Difference]: With dead ends: 295 [2018-10-24 12:34:35,627 INFO L226 Difference]: Without dead ends: 216 [2018-10-24 12:34:35,628 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 307 SyntacticMatches, 24 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=896, Invalid=2410, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:34:35,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2018-10-24 12:34:35,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 151. [2018-10-24 12:34:35,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:34:35,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 161 transitions. [2018-10-24 12:34:35,639 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 161 transitions. Word has length 173 [2018-10-24 12:34:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:35,639 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 161 transitions. [2018-10-24 12:34:35,639 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:34:35,640 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 161 transitions. [2018-10-24 12:34:35,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:34:35,641 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:35,641 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:35,641 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:35,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:35,642 INFO L82 PathProgramCache]: Analyzing trace with hash 792251949, now seen corresponding path program 18 times [2018-10-24 12:34:35,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:35,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:35,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:35,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:35,643 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:35,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:36,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 455 proven. 273 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:36,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:36,089 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:36,089 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:36,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:36,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:36,089 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:36,099 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:36,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:36,158 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:36,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:36,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:36,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 455 proven. 273 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:36,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:36,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 455 proven. 273 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:36,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:36,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 44 [2018-10-24 12:34:36,879 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:36,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:34:36,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:34:36,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:34:36,881 INFO L87 Difference]: Start difference. First operand 151 states and 161 transitions. Second operand 44 states. [2018-10-24 12:34:37,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:37,883 INFO L93 Difference]: Finished difference Result 301 states and 353 transitions. [2018-10-24 12:34:37,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:34:37,884 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 176 [2018-10-24 12:34:37,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:37,886 INFO L225 Difference]: With dead ends: 301 [2018-10-24 12:34:37,886 INFO L226 Difference]: Without dead ends: 224 [2018-10-24 12:34:37,888 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 312 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:34:37,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-10-24 12:34:37,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 154. [2018-10-24 12:34:37,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:34:37,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 164 transitions. [2018-10-24 12:34:37,899 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 164 transitions. Word has length 176 [2018-10-24 12:34:37,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:37,899 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 164 transitions. [2018-10-24 12:34:37,899 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:34:37,899 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 164 transitions. [2018-10-24 12:34:37,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-24 12:34:37,900 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:37,900 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:37,901 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:37,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:37,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1943038199, now seen corresponding path program 19 times [2018-10-24 12:34:37,901 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:37,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:37,902 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:37,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:37,902 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:37,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 340 proven. 466 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:34:38,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:38,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:38,422 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:38,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:38,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:38,423 INFO L194 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 [2018-10-24 12:34:38,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:38,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:38,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:38,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:38,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 341 proven. 429 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:38,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:38,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 341 proven. 429 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:38,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:38,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 23 [2018-10-24 12:34:38,830 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:38,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:34:38,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:34:38,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:38,832 INFO L87 Difference]: Start difference. First operand 154 states and 164 transitions. Second operand 22 states. [2018-10-24 12:34:39,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:39,062 INFO L93 Difference]: Finished difference Result 170 states and 181 transitions. [2018-10-24 12:34:39,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:34:39,064 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 179 [2018-10-24 12:34:39,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:39,066 INFO L225 Difference]: With dead ends: 170 [2018-10-24 12:34:39,066 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:34:39,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 344 SyntacticMatches, 27 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:39,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:34:39,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2018-10-24 12:34:39,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-24 12:34:39,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 179 transitions. [2018-10-24 12:34:39,080 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 179 transitions. Word has length 179 [2018-10-24 12:34:39,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:39,080 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 179 transitions. [2018-10-24 12:34:39,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:34:39,081 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 179 transitions. [2018-10-24 12:34:39,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-24 12:34:39,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:39,084 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:39,084 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:39,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:39,085 INFO L82 PathProgramCache]: Analyzing trace with hash 213227881, now seen corresponding path program 20 times [2018-10-24 12:34:39,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:39,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:39,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:39,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:39,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:39,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:39,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 600 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:39,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:39,661 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:39,661 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:39,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:39,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:39,662 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:39,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:39,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:39,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:34:39,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:39,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:40,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 600 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:40,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:40,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 600 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:40,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:40,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 51 [2018-10-24 12:34:40,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:40,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:34:40,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:34:40,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=1923, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:34:40,928 INFO L87 Difference]: Start difference. First operand 168 states and 179 transitions. Second operand 49 states. [2018-10-24 12:34:41,856 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-24 12:34:42,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:42,902 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-10-24 12:34:42,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:34:42,909 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 197 [2018-10-24 12:34:42,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:42,911 INFO L225 Difference]: With dead ends: 335 [2018-10-24 12:34:42,911 INFO L226 Difference]: Without dead ends: 246 [2018-10-24 12:34:42,913 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 349 SyntacticMatches, 28 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1439 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1152, Invalid=3138, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:34:42,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2018-10-24 12:34:42,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 171. [2018-10-24 12:34:42,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-24 12:34:42,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 182 transitions. [2018-10-24 12:34:42,925 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 182 transitions. Word has length 197 [2018-10-24 12:34:42,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:42,926 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 182 transitions. [2018-10-24 12:34:42,926 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:34:42,926 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 182 transitions. [2018-10-24 12:34:42,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-24 12:34:42,931 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:42,932 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:42,932 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:42,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:42,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1707593203, now seen corresponding path program 21 times [2018-10-24 12:34:42,933 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:42,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,933 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:42,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,934 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:42,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:43,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 600 proven. 360 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:43,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,454 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:43,454 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:43,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:43,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,455 INFO L194 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 [2018-10-24 12:34:43,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:43,467 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:43,528 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:43,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:43,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:44,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 600 proven. 360 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:44,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:44,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 600 proven. 360 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:44,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:44,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 50 [2018-10-24 12:34:44,849 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:44,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:34:44,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:34:44,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:34:44,850 INFO L87 Difference]: Start difference. First operand 171 states and 182 transitions. Second operand 50 states. [2018-10-24 12:34:46,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:46,233 INFO L93 Difference]: Finished difference Result 341 states and 400 transitions. [2018-10-24 12:34:46,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:34:46,233 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 200 [2018-10-24 12:34:46,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:46,235 INFO L225 Difference]: With dead ends: 341 [2018-10-24 12:34:46,235 INFO L226 Difference]: Without dead ends: 254 [2018-10-24 12:34:46,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 354 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:34:46,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-24 12:34:46,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 174. [2018-10-24 12:34:46,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-24 12:34:46,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 185 transitions. [2018-10-24 12:34:46,250 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 185 transitions. Word has length 200 [2018-10-24 12:34:46,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:46,250 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 185 transitions. [2018-10-24 12:34:46,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:34:46,250 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 185 transitions. [2018-10-24 12:34:46,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-24 12:34:46,252 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:46,252 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:46,252 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:46,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:46,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1255745257, now seen corresponding path program 22 times [2018-10-24 12:34:46,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:46,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:46,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:46,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:46,253 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:46,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 437 proven. 613 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:34:46,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:46,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:46,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:46,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:46,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:46,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:46,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:46,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:46,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 438 proven. 570 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:46,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:47,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 438 proven. 570 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:47,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:47,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 25 [2018-10-24 12:34:47,044 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:47,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:34:47,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:34:47,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:47,046 INFO L87 Difference]: Start difference. First operand 174 states and 185 transitions. Second operand 24 states. [2018-10-24 12:34:47,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:47,445 INFO L93 Difference]: Finished difference Result 190 states and 202 transitions. [2018-10-24 12:34:47,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:34:47,446 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 203 [2018-10-24 12:34:47,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:47,450 INFO L225 Difference]: With dead ends: 190 [2018-10-24 12:34:47,450 INFO L226 Difference]: Without dead ends: 188 [2018-10-24 12:34:47,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 390 SyntacticMatches, 31 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:47,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-10-24 12:34:47,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2018-10-24 12:34:47,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-10-24 12:34:47,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 200 transitions. [2018-10-24 12:34:47,467 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 200 transitions. Word has length 203 [2018-10-24 12:34:47,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:47,468 INFO L481 AbstractCegarLoop]: Abstraction has 188 states and 200 transitions. [2018-10-24 12:34:47,468 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:34:47,468 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 200 transitions. [2018-10-24 12:34:47,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-24 12:34:47,469 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:47,469 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:47,470 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:47,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,470 INFO L82 PathProgramCache]: Analyzing trace with hash -187764407, now seen corresponding path program 23 times [2018-10-24 12:34:47,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:47,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:47,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,471 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:47,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:48,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 765 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:48,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:48,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:48,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:48,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,109 INFO L194 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 [2018-10-24 12:34:48,118 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:48,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:48,295 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:34:48,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:48,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 765 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:50,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:50,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 765 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:50,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:50,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 57 [2018-10-24 12:34:50,842 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:50,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:34:50,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:34:50,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=777, Invalid=2415, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:34:50,845 INFO L87 Difference]: Start difference. First operand 188 states and 200 transitions. Second operand 55 states. [2018-10-24 12:34:52,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:52,172 INFO L93 Difference]: Finished difference Result 375 states and 438 transitions. [2018-10-24 12:34:52,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:34:52,173 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 221 [2018-10-24 12:34:52,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:52,174 INFO L225 Difference]: With dead ends: 375 [2018-10-24 12:34:52,174 INFO L226 Difference]: Without dead ends: 276 [2018-10-24 12:34:52,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 391 SyntacticMatches, 32 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1835 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1440, Invalid=3962, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:34:52,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-24 12:34:52,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 191. [2018-10-24 12:34:52,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-24 12:34:52,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 203 transitions. [2018-10-24 12:34:52,192 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 203 transitions. Word has length 221 [2018-10-24 12:34:52,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:52,192 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 203 transitions. [2018-10-24 12:34:52,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:34:52,192 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 203 transitions. [2018-10-24 12:34:52,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-24 12:34:52,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:52,194 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:52,194 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:52,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:52,195 INFO L82 PathProgramCache]: Analyzing trace with hash -117776915, now seen corresponding path program 24 times [2018-10-24 12:34:52,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:52,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,196 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:52,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:52,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:52,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1768 backedges. 765 proven. 459 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:52,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:52,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:52,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:52,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:52,827 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:52,828 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:52,912 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:52,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:52,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:53,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1768 backedges. 765 proven. 459 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:53,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:54,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1768 backedges. 765 proven. 459 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:54,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:54,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 56 [2018-10-24 12:34:54,232 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:54,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:34:54,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:34:54,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:34:54,235 INFO L87 Difference]: Start difference. First operand 191 states and 203 transitions. Second operand 56 states. [2018-10-24 12:34:56,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:56,034 INFO L93 Difference]: Finished difference Result 381 states and 447 transitions. [2018-10-24 12:34:56,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:34:56,034 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 224 [2018-10-24 12:34:56,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:56,036 INFO L225 Difference]: With dead ends: 381 [2018-10-24 12:34:56,036 INFO L226 Difference]: Without dead ends: 284 [2018-10-24 12:34:56,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 396 SyntacticMatches, 35 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:34:56,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2018-10-24 12:34:56,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 194. [2018-10-24 12:34:56,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-10-24 12:34:56,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 206 transitions. [2018-10-24 12:34:56,051 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 206 transitions. Word has length 224 [2018-10-24 12:34:56,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:56,052 INFO L481 AbstractCegarLoop]: Abstraction has 194 states and 206 transitions. [2018-10-24 12:34:56,052 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-24 12:34:56,052 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 206 transitions. [2018-10-24 12:34:56,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-10-24 12:34:56,053 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:56,054 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:56,054 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:56,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:56,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1820458697, now seen corresponding path program 25 times [2018-10-24 12:34:56,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:56,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:56,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,055 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:56,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:57,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1822 backedges. 546 proven. 780 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:34:57,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,062 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:57,062 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:57,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:57,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,062 INFO L194 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 [2018-10-24 12:34:57,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:57,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:57,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:57,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:57,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1822 backedges. 547 proven. 731 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:57,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:57,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1822 backedges. 547 proven. 731 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:57,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:57,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 27 [2018-10-24 12:34:57,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:57,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:34:57,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:34:57,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:57,651 INFO L87 Difference]: Start difference. First operand 194 states and 206 transitions. Second operand 26 states. [2018-10-24 12:34:57,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:57,924 INFO L93 Difference]: Finished difference Result 210 states and 223 transitions. [2018-10-24 12:34:57,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:34:57,925 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 227 [2018-10-24 12:34:57,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:57,927 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:34:57,927 INFO L226 Difference]: Without dead ends: 208 [2018-10-24 12:34:57,928 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 436 SyntacticMatches, 35 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:34:57,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-24 12:34:57,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2018-10-24 12:34:57,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-24 12:34:57,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 221 transitions. [2018-10-24 12:34:57,941 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 221 transitions. Word has length 227 [2018-10-24 12:34:57,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:57,942 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 221 transitions. [2018-10-24 12:34:57,942 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:34:57,942 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 221 transitions. [2018-10-24 12:34:57,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-24 12:34:57,943 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:57,944 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:57,944 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:57,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:57,944 INFO L82 PathProgramCache]: Analyzing trace with hash 161845545, now seen corresponding path program 26 times [2018-10-24 12:34:57,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:57,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:57,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:57,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:57,945 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:57,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 950 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:58,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:58,809 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:58,809 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:58,809 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:58,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:58,810 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:58,817 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:58,817 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:58,915 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-24 12:34:58,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:58,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:59,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 950 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:59,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:00,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 950 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:00,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:00,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 63 [2018-10-24 12:35:00,195 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:00,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:35:00,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:35:00,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=943, Invalid=2963, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:35:00,197 INFO L87 Difference]: Start difference. First operand 208 states and 221 transitions. Second operand 61 states. [2018-10-24 12:35:01,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:01,247 INFO L93 Difference]: Finished difference Result 415 states and 485 transitions. [2018-10-24 12:35:01,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:35:01,248 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 245 [2018-10-24 12:35:01,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:01,250 INFO L225 Difference]: With dead ends: 415 [2018-10-24 12:35:01,250 INFO L226 Difference]: Without dead ends: 306 [2018-10-24 12:35:01,252 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 433 SyntacticMatches, 36 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2279 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1760, Invalid=4882, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:35:01,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2018-10-24 12:35:01,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 211. [2018-10-24 12:35:01,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2018-10-24 12:35:01,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 224 transitions. [2018-10-24 12:35:01,267 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 224 transitions. Word has length 245 [2018-10-24 12:35:01,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:01,267 INFO L481 AbstractCegarLoop]: Abstraction has 211 states and 224 transitions. [2018-10-24 12:35:01,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:35:01,268 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 224 transitions. [2018-10-24 12:35:01,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2018-10-24 12:35:01,269 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:01,269 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:01,270 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:01,270 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:01,270 INFO L82 PathProgramCache]: Analyzing trace with hash 851366349, now seen corresponding path program 27 times [2018-10-24 12:35:01,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:01,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,271 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:01,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,271 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:01,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:02,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2204 backedges. 950 proven. 570 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:02,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,435 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:02,435 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:02,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:02,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,436 INFO L194 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 [2018-10-24 12:35:02,449 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:02,449 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:02,530 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:02,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:02,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:03,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2204 backedges. 950 proven. 570 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:03,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2204 backedges. 950 proven. 570 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:04,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 62 [2018-10-24 12:35:04,119 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-24 12:35:04,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-24 12:35:04,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:35:04,120 INFO L87 Difference]: Start difference. First operand 211 states and 224 transitions. Second operand 62 states. [2018-10-24 12:35:05,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:05,269 INFO L93 Difference]: Finished difference Result 421 states and 494 transitions. [2018-10-24 12:35:05,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:35:05,269 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 248 [2018-10-24 12:35:05,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:05,270 INFO L225 Difference]: With dead ends: 421 [2018-10-24 12:35:05,270 INFO L226 Difference]: Without dead ends: 314 [2018-10-24 12:35:05,272 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 438 SyntacticMatches, 39 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:35:05,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-10-24 12:35:05,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 214. [2018-10-24 12:35:05,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-24 12:35:05,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 227 transitions. [2018-10-24 12:35:05,287 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 227 transitions. Word has length 248 [2018-10-24 12:35:05,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:05,287 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 227 transitions. [2018-10-24 12:35:05,288 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-24 12:35:05,288 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 227 transitions. [2018-10-24 12:35:05,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2018-10-24 12:35:05,289 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:05,290 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:05,290 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:05,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:05,290 INFO L82 PathProgramCache]: Analyzing trace with hash -462938455, now seen corresponding path program 28 times [2018-10-24 12:35:05,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:05,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:05,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,291 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:05,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:05,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2264 backedges. 667 proven. 967 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:35:05,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:05,918 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:05,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:05,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:05,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:05,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:06,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:06,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:06,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2264 backedges. 668 proven. 912 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:06,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:06,527 INFO L134 CoverageAnalysis]: Checked inductivity of 2264 backedges. 668 proven. 912 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:35:06,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:06,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 29 [2018-10-24 12:35:06,548 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:06,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:35:06,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:35:06,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:35:06,549 INFO L87 Difference]: Start difference. First operand 214 states and 227 transitions. Second operand 28 states. [2018-10-24 12:35:06,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:06,888 INFO L93 Difference]: Finished difference Result 230 states and 244 transitions. [2018-10-24 12:35:06,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:35:06,888 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 251 [2018-10-24 12:35:06,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:06,890 INFO L225 Difference]: With dead ends: 230 [2018-10-24 12:35:06,890 INFO L226 Difference]: Without dead ends: 228 [2018-10-24 12:35:06,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 550 GetRequests, 482 SyntacticMatches, 39 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:06,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2018-10-24 12:35:06,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2018-10-24 12:35:06,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2018-10-24 12:35:06,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 242 transitions. [2018-10-24 12:35:06,905 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 242 transitions. Word has length 251 [2018-10-24 12:35:06,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:06,906 INFO L481 AbstractCegarLoop]: Abstraction has 228 states and 242 transitions. [2018-10-24 12:35:06,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:35:06,906 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 242 transitions. [2018-10-24 12:35:06,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-10-24 12:35:06,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:06,908 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:06,908 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:06,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:06,909 INFO L82 PathProgramCache]: Analyzing trace with hash 720861449, now seen corresponding path program 29 times [2018-10-24 12:35:06,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:06,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:06,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:06,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:08,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1155 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:08,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:08,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:08,140 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:08,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:08,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:08,140 INFO L194 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 [2018-10-24 12:35:08,147 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:08,148 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:08,278 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 12:35:08,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:08,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:09,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1155 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:09,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:09,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1155 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:09,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:09,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 69 [2018-10-24 12:35:09,906 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:09,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:35:09,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:35:09,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=3567, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:35:09,908 INFO L87 Difference]: Start difference. First operand 228 states and 242 transitions. Second operand 67 states. [2018-10-24 12:35:11,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:11,426 INFO L93 Difference]: Finished difference Result 455 states and 532 transitions. [2018-10-24 12:35:11,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:35:11,427 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 269 [2018-10-24 12:35:11,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:11,428 INFO L225 Difference]: With dead ends: 455 [2018-10-24 12:35:11,429 INFO L226 Difference]: Without dead ends: 336 [2018-10-24 12:35:11,430 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 475 SyntacticMatches, 40 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2771 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2112, Invalid=5898, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:35:11,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-10-24 12:35:11,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 231. [2018-10-24 12:35:11,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-10-24 12:35:11,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 245 transitions. [2018-10-24 12:35:11,445 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 245 transitions. Word has length 269 [2018-10-24 12:35:11,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:11,445 INFO L481 AbstractCegarLoop]: Abstraction has 231 states and 245 transitions. [2018-10-24 12:35:11,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:35:11,446 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 245 transitions. [2018-10-24 12:35:11,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-10-24 12:35:11,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:11,447 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:11,447 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:11,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:11,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1690169939, now seen corresponding path program 30 times [2018-10-24 12:35:11,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:11,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:11,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,448 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:11,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:12,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 1155 proven. 693 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:12,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:12,362 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:12,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:12,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:12,376 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:12,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:12,475 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:12,475 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:12,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:13,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 1155 proven. 693 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:13,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:14,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 1155 proven. 693 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:14,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:14,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 68 [2018-10-24 12:35:14,671 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:14,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-24 12:35:14,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-24 12:35:14,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:35:14,673 INFO L87 Difference]: Start difference. First operand 231 states and 245 transitions. Second operand 68 states. [2018-10-24 12:35:16,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:16,208 INFO L93 Difference]: Finished difference Result 461 states and 541 transitions. [2018-10-24 12:35:16,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:35:16,208 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 272 [2018-10-24 12:35:16,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:16,210 INFO L225 Difference]: With dead ends: 461 [2018-10-24 12:35:16,210 INFO L226 Difference]: Without dead ends: 344 [2018-10-24 12:35:16,212 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 480 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2730 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:35:16,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-24 12:35:16,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 234. [2018-10-24 12:35:16,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-10-24 12:35:16,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 248 transitions. [2018-10-24 12:35:16,230 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 248 transitions. Word has length 272 [2018-10-24 12:35:16,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:16,230 INFO L481 AbstractCegarLoop]: Abstraction has 234 states and 248 transitions. [2018-10-24 12:35:16,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-24 12:35:16,230 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 248 transitions. [2018-10-24 12:35:16,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-24 12:35:16,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:16,232 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:16,232 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:16,232 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:16,233 INFO L82 PathProgramCache]: Analyzing trace with hash 306808457, now seen corresponding path program 31 times [2018-10-24 12:35:16,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:16,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,233 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:16,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,234 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:16,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:16,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2754 backedges. 800 proven. 1174 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:35:16,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,802 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:16,802 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:16,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:16,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,802 INFO L194 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 [2018-10-24 12:35:16,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:16,811 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:16,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:16,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:17,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2754 backedges. 801 proven. 1113 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:17,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:17,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2754 backedges. 801 proven. 1113 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:17,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:17,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 31 [2018-10-24 12:35:17,593 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:17,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:17,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:17,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:17,595 INFO L87 Difference]: Start difference. First operand 234 states and 248 transitions. Second operand 30 states. [2018-10-24 12:35:18,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:18,070 INFO L93 Difference]: Finished difference Result 250 states and 265 transitions. [2018-10-24 12:35:18,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:18,070 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 275 [2018-10-24 12:35:18,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:18,072 INFO L225 Difference]: With dead ends: 250 [2018-10-24 12:35:18,072 INFO L226 Difference]: Without dead ends: 248 [2018-10-24 12:35:18,073 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 528 SyntacticMatches, 43 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:18,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-10-24 12:35:18,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2018-10-24 12:35:18,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-10-24 12:35:18,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 263 transitions. [2018-10-24 12:35:18,088 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 263 transitions. Word has length 275 [2018-10-24 12:35:18,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:18,089 INFO L481 AbstractCegarLoop]: Abstraction has 248 states and 263 transitions. [2018-10-24 12:35:18,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:18,089 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 263 transitions. [2018-10-24 12:35:18,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2018-10-24 12:35:18,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:18,091 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:18,092 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:18,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:18,092 INFO L82 PathProgramCache]: Analyzing trace with hash -2063423255, now seen corresponding path program 32 times [2018-10-24 12:35:18,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:18,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:18,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:18,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:18,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1380 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:20,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,024 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:20,024 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:20,024 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:20,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,024 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:20,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:20,032 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:20,158 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:35:20,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:20,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:21,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1380 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:21,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:22,218 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1380 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:22,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:22,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 75 [2018-10-24 12:35:22,240 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:22,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:35:22,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:35:22,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1323, Invalid=4227, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:35:22,242 INFO L87 Difference]: Start difference. First operand 248 states and 263 transitions. Second operand 73 states. [2018-10-24 12:35:23,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:23,701 INFO L93 Difference]: Finished difference Result 495 states and 579 transitions. [2018-10-24 12:35:23,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:35:23,701 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 293 [2018-10-24 12:35:23,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:23,703 INFO L225 Difference]: With dead ends: 495 [2018-10-24 12:35:23,703 INFO L226 Difference]: Without dead ends: 366 [2018-10-24 12:35:23,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 657 GetRequests, 517 SyntacticMatches, 44 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3311 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2496, Invalid=7010, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:35:23,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-10-24 12:35:23,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 251. [2018-10-24 12:35:23,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2018-10-24 12:35:23,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 266 transitions. [2018-10-24 12:35:23,720 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 266 transitions. Word has length 293 [2018-10-24 12:35:23,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:23,720 INFO L481 AbstractCegarLoop]: Abstraction has 251 states and 266 transitions. [2018-10-24 12:35:23,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:35:23,720 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 266 transitions. [2018-10-24 12:35:23,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-24 12:35:23,722 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:23,722 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:23,722 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:23,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:23,723 INFO L82 PathProgramCache]: Analyzing trace with hash -759000691, now seen corresponding path program 33 times [2018-10-24 12:35:23,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:23,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,724 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:23,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,724 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:24,641 INFO L134 CoverageAnalysis]: Checked inductivity of 3220 backedges. 1380 proven. 828 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:24,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:24,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:24,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:24,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:24,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:24,642 INFO L194 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 [2018-10-24 12:35:24,649 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:24,650 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:24,745 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:24,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:24,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:26,681 INFO L134 CoverageAnalysis]: Checked inductivity of 3220 backedges. 1380 proven. 828 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:26,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:27,536 INFO L134 CoverageAnalysis]: Checked inductivity of 3220 backedges. 1380 proven. 828 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:27,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:27,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 74 [2018-10-24 12:35:27,558 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:27,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-10-24 12:35:27,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-10-24 12:35:27,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:35:27,560 INFO L87 Difference]: Start difference. First operand 251 states and 266 transitions. Second operand 74 states. [2018-10-24 12:35:28,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:28,964 INFO L93 Difference]: Finished difference Result 501 states and 588 transitions. [2018-10-24 12:35:28,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:35:28,964 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 296 [2018-10-24 12:35:28,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:28,967 INFO L225 Difference]: With dead ends: 501 [2018-10-24 12:35:28,967 INFO L226 Difference]: Without dead ends: 374 [2018-10-24 12:35:28,968 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 665 GetRequests, 522 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:35:28,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2018-10-24 12:35:28,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 254. [2018-10-24 12:35:28,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2018-10-24 12:35:28,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 269 transitions. [2018-10-24 12:35:28,985 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 269 transitions. Word has length 296 [2018-10-24 12:35:28,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:28,985 INFO L481 AbstractCegarLoop]: Abstraction has 254 states and 269 transitions. [2018-10-24 12:35:28,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-10-24 12:35:28,986 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 269 transitions. [2018-10-24 12:35:28,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2018-10-24 12:35:28,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:28,988 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:28,988 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:28,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:28,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1570490775, now seen corresponding path program 34 times [2018-10-24 12:35:28,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:28,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:28,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,990 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:29,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,491 INFO L134 CoverageAnalysis]: Checked inductivity of 3292 backedges. 945 proven. 1401 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-24 12:35:29,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:29,492 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:29,492 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:29,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:29,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:29,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:29,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:30,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3292 backedges. 946 proven. 1334 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:30,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:30,681 INFO L134 CoverageAnalysis]: Checked inductivity of 3292 backedges. 946 proven. 1334 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:30,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:30,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 33 [2018-10-24 12:35:30,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:30,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:35:30,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:35:30,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:30,704 INFO L87 Difference]: Start difference. First operand 254 states and 269 transitions. Second operand 32 states. [2018-10-24 12:35:31,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:31,183 INFO L93 Difference]: Finished difference Result 270 states and 286 transitions. [2018-10-24 12:35:31,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:35:31,183 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 299 [2018-10-24 12:35:31,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:31,185 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:35:31,185 INFO L226 Difference]: Without dead ends: 268 [2018-10-24 12:35:31,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 574 SyntacticMatches, 47 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:31,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2018-10-24 12:35:31,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 268. [2018-10-24 12:35:31,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2018-10-24 12:35:31,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 284 transitions. [2018-10-24 12:35:31,204 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 284 transitions. Word has length 299 [2018-10-24 12:35:31,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:31,204 INFO L481 AbstractCegarLoop]: Abstraction has 268 states and 284 transitions. [2018-10-24 12:35:31,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:35:31,204 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 284 transitions. [2018-10-24 12:35:31,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2018-10-24 12:35:31,207 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:31,207 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:31,207 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:31,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:31,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1887772873, now seen corresponding path program 35 times [2018-10-24 12:35:31,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:31,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:31,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:31,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:31,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:31,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:32,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1625 proven. 900 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:32,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:32,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:32,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:32,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,528 INFO L194 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 [2018-10-24 12:35:32,537 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:32,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:32,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-24 12:35:32,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:32,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1625 proven. 900 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:33,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:34,881 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1625 proven. 900 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:34,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:34,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 81 [2018-10-24 12:35:34,904 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:34,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-24 12:35:34,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-24 12:35:34,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1537, Invalid=4943, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:35:34,905 INFO L87 Difference]: Start difference. First operand 268 states and 284 transitions. Second operand 79 states. [2018-10-24 12:35:36,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:36,911 INFO L93 Difference]: Finished difference Result 535 states and 626 transitions. [2018-10-24 12:35:36,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:35:36,911 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 317 [2018-10-24 12:35:36,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:36,913 INFO L225 Difference]: With dead ends: 535 [2018-10-24 12:35:36,913 INFO L226 Difference]: Without dead ends: 396 [2018-10-24 12:35:36,914 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 559 SyntacticMatches, 48 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3899 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2912, Invalid=8218, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:35:36,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2018-10-24 12:35:36,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 271. [2018-10-24 12:35:36,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2018-10-24 12:35:36,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 287 transitions. [2018-10-24 12:35:36,929 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 287 transitions. Word has length 317 [2018-10-24 12:35:36,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:36,929 INFO L481 AbstractCegarLoop]: Abstraction has 271 states and 287 transitions. [2018-10-24 12:35:36,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-10-24 12:35:36,929 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 287 transitions. [2018-10-24 12:35:36,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2018-10-24 12:35:36,931 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:36,931 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:36,931 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:36,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:36,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1510056595, now seen corresponding path program 36 times [2018-10-24 12:35:36,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:36,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:36,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:36,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:36,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:36,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:37,984 INFO L134 CoverageAnalysis]: Checked inductivity of 3800 backedges. 1625 proven. 975 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:37,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:37,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:37,984 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:37,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:37,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:37,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:37,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:37,992 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:38,094 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:38,094 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:38,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:39,370 INFO L134 CoverageAnalysis]: Checked inductivity of 3800 backedges. 1625 proven. 975 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:39,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:40,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3800 backedges. 1625 proven. 975 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:40,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:40,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 80 [2018-10-24 12:35:40,295 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:40,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-10-24 12:35:40,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-10-24 12:35:40,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:35:40,297 INFO L87 Difference]: Start difference. First operand 271 states and 287 transitions. Second operand 80 states. [2018-10-24 12:35:42,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:42,333 INFO L93 Difference]: Finished difference Result 541 states and 635 transitions. [2018-10-24 12:35:42,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:35:42,333 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 320 [2018-10-24 12:35:42,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:42,335 INFO L225 Difference]: With dead ends: 541 [2018-10-24 12:35:42,335 INFO L226 Difference]: Without dead ends: 404 [2018-10-24 12:35:42,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 719 GetRequests, 564 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:35:42,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2018-10-24 12:35:42,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 274. [2018-10-24 12:35:42,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-24 12:35:42,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 290 transitions. [2018-10-24 12:35:42,356 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 290 transitions. Word has length 320 [2018-10-24 12:35:42,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:42,356 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 290 transitions. [2018-10-24 12:35:42,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-10-24 12:35:42,356 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 290 transitions. [2018-10-24 12:35:42,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2018-10-24 12:35:42,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:42,358 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:42,359 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:42,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:42,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1836461641, now seen corresponding path program 37 times [2018-10-24 12:35:42,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:42,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:42,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:43,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3878 backedges. 1102 proven. 1648 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-24 12:35:43,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:43,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:43,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:43,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:43,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:43,142 INFO L194 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 [2018-10-24 12:35:43,151 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:43,151 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:43,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:43,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:43,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3878 backedges. 1103 proven. 1575 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:43,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:44,226 INFO L134 CoverageAnalysis]: Checked inductivity of 3878 backedges. 1103 proven. 1575 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:44,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:44,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 35 [2018-10-24 12:35:44,248 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:44,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:35:44,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:35:44,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:44,249 INFO L87 Difference]: Start difference. First operand 274 states and 290 transitions. Second operand 34 states. [2018-10-24 12:35:44,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:44,627 INFO L93 Difference]: Finished difference Result 290 states and 307 transitions. [2018-10-24 12:35:44,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:35:44,628 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 323 [2018-10-24 12:35:44,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:44,630 INFO L225 Difference]: With dead ends: 290 [2018-10-24 12:35:44,630 INFO L226 Difference]: Without dead ends: 288 [2018-10-24 12:35:44,630 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 620 SyntacticMatches, 51 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 941 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:35:44,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2018-10-24 12:35:44,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 288. [2018-10-24 12:35:44,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2018-10-24 12:35:44,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 305 transitions. [2018-10-24 12:35:44,649 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 305 transitions. Word has length 323 [2018-10-24 12:35:44,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:44,649 INFO L481 AbstractCegarLoop]: Abstraction has 288 states and 305 transitions. [2018-10-24 12:35:44,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:35:44,650 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 305 transitions. [2018-10-24 12:35:44,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2018-10-24 12:35:44,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:44,652 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:44,653 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:44,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:44,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1388109993, now seen corresponding path program 38 times [2018-10-24 12:35:44,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:44,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:44,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,654 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:44,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:46,280 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1890 proven. 1053 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:46,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:46,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:46,281 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:46,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:46,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:46,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:46,289 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:46,289 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:46,441 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-24 12:35:46,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:46,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:47,908 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1890 proven. 1053 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:47,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:49,813 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1890 proven. 1053 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:49,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:49,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 87 [2018-10-24 12:35:49,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:49,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-24 12:35:49,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-24 12:35:49,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1767, Invalid=5715, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:35:49,836 INFO L87 Difference]: Start difference. First operand 288 states and 305 transitions. Second operand 85 states. [2018-10-24 12:35:51,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:51,450 INFO L93 Difference]: Finished difference Result 575 states and 673 transitions. [2018-10-24 12:35:51,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:35:51,451 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 341 [2018-10-24 12:35:51,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:51,453 INFO L225 Difference]: With dead ends: 575 [2018-10-24 12:35:51,453 INFO L226 Difference]: Without dead ends: 426 [2018-10-24 12:35:51,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 765 GetRequests, 601 SyntacticMatches, 52 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4535 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3360, Invalid=9522, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:35:51,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2018-10-24 12:35:51,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 291. [2018-10-24 12:35:51,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2018-10-24 12:35:51,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 308 transitions. [2018-10-24 12:35:51,477 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 308 transitions. Word has length 341 [2018-10-24 12:35:51,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:51,478 INFO L481 AbstractCegarLoop]: Abstraction has 291 states and 308 transitions. [2018-10-24 12:35:51,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-24 12:35:51,478 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 308 transitions. [2018-10-24 12:35:51,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-24 12:35:51,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:51,481 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:51,481 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:51,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:51,481 INFO L82 PathProgramCache]: Analyzing trace with hash -298618547, now seen corresponding path program 39 times [2018-10-24 12:35:51,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:51,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:51,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:51,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:51,482 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:51,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:52,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4428 backedges. 1890 proven. 1134 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:52,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:52,849 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:52,849 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:52,849 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:52,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:52,849 INFO L194 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 [2018-10-24 12:35:52,857 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:52,857 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:52,967 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:52,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:52,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:54,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4428 backedges. 1890 proven. 1134 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:54,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:56,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4428 backedges. 1890 proven. 1134 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:56,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:56,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 86 [2018-10-24 12:35:56,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:56,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-10-24 12:35:56,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-10-24 12:35:56,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:35:56,032 INFO L87 Difference]: Start difference. First operand 291 states and 308 transitions. Second operand 86 states. [2018-10-24 12:35:58,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:58,030 INFO L93 Difference]: Finished difference Result 581 states and 682 transitions. [2018-10-24 12:35:58,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:35:58,031 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 344 [2018-10-24 12:35:58,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:58,032 INFO L225 Difference]: With dead ends: 581 [2018-10-24 12:35:58,033 INFO L226 Difference]: Without dead ends: 434 [2018-10-24 12:35:58,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 606 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:35:58,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2018-10-24 12:35:58,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 294. [2018-10-24 12:35:58,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2018-10-24 12:35:58,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 311 transitions. [2018-10-24 12:35:58,055 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 311 transitions. Word has length 344 [2018-10-24 12:35:58,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:58,056 INFO L481 AbstractCegarLoop]: Abstraction has 294 states and 311 transitions. [2018-10-24 12:35:58,056 INFO L482 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-10-24 12:35:58,056 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 311 transitions. [2018-10-24 12:35:58,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2018-10-24 12:35:58,058 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:58,058 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:58,059 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:58,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:58,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1488809513, now seen corresponding path program 40 times [2018-10-24 12:35:58,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:58,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:58,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:58,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:58,060 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:58,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:58,818 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 1271 proven. 1915 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-24 12:35:58,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:58,819 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:58,819 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:58,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:58,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:58,828 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:58,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:58,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:59,072 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 1272 proven. 1836 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:59,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:59,824 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 1272 proven. 1836 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:59,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:59,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 37 [2018-10-24 12:35:59,845 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:59,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:35:59,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:35:59,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:35:59,847 INFO L87 Difference]: Start difference. First operand 294 states and 311 transitions. Second operand 36 states. [2018-10-24 12:36:00,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:00,326 INFO L93 Difference]: Finished difference Result 310 states and 328 transitions. [2018-10-24 12:36:00,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:36:00,327 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 347 [2018-10-24 12:36:00,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:00,329 INFO L225 Difference]: With dead ends: 310 [2018-10-24 12:36:00,329 INFO L226 Difference]: Without dead ends: 308 [2018-10-24 12:36:00,329 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 666 SyntacticMatches, 55 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:36:00,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-24 12:36:00,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 308. [2018-10-24 12:36:00,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2018-10-24 12:36:00,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 326 transitions. [2018-10-24 12:36:00,346 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 326 transitions. Word has length 347 [2018-10-24 12:36:00,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:00,346 INFO L481 AbstractCegarLoop]: Abstraction has 308 states and 326 transitions. [2018-10-24 12:36:00,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:36:00,347 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 326 transitions. [2018-10-24 12:36:00,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-24 12:36:00,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:00,349 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:00,349 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:00,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:00,350 INFO L82 PathProgramCache]: Analyzing trace with hash 2103961737, now seen corresponding path program 41 times [2018-10-24 12:36:00,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:00,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,351 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:00,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,351 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:00,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:02,272 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 2175 proven. 1218 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:02,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:02,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:02,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:02,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:02,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:02,272 INFO L194 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 [2018-10-24 12:36:02,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:02,281 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:02,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:36:02,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:02,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:04,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 2175 proven. 1218 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:04,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:05,480 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 2175 proven. 1218 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:05,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:05,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 93 [2018-10-24 12:36:05,502 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:05,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-10-24 12:36:05,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-10-24 12:36:05,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2013, Invalid=6543, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:36:05,503 INFO L87 Difference]: Start difference. First operand 308 states and 326 transitions. Second operand 91 states. [2018-10-24 12:36:07,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:07,560 INFO L93 Difference]: Finished difference Result 615 states and 720 transitions. [2018-10-24 12:36:07,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-24 12:36:07,561 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 365 [2018-10-24 12:36:07,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:07,563 INFO L225 Difference]: With dead ends: 615 [2018-10-24 12:36:07,563 INFO L226 Difference]: Without dead ends: 456 [2018-10-24 12:36:07,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 643 SyntacticMatches, 56 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5219 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3840, Invalid=10922, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:36:07,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2018-10-24 12:36:07,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 311. [2018-10-24 12:36:07,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 311 states. [2018-10-24 12:36:07,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 329 transitions. [2018-10-24 12:36:07,584 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 329 transitions. Word has length 365 [2018-10-24 12:36:07,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:07,585 INFO L481 AbstractCegarLoop]: Abstraction has 311 states and 329 transitions. [2018-10-24 12:36:07,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-10-24 12:36:07,585 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 329 transitions. [2018-10-24 12:36:07,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2018-10-24 12:36:07,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:07,588 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:07,588 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:07,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:07,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1897909549, now seen corresponding path program 42 times [2018-10-24 12:36:07,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:07,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:07,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:07,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:09,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5104 backedges. 2175 proven. 1305 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:09,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:09,086 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:09,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:09,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,087 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:09,094 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:09,094 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:09,203 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:09,203 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:09,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:10,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5104 backedges. 2175 proven. 1305 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:10,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:11,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5104 backedges. 2175 proven. 1305 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:12,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:12,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 92 [2018-10-24 12:36:12,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:12,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-10-24 12:36:12,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-10-24 12:36:12,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:36:12,005 INFO L87 Difference]: Start difference. First operand 311 states and 329 transitions. Second operand 92 states. [2018-10-24 12:36:14,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:14,071 INFO L93 Difference]: Finished difference Result 621 states and 729 transitions. [2018-10-24 12:36:14,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:36:14,071 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 368 [2018-10-24 12:36:14,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:14,074 INFO L225 Difference]: With dead ends: 621 [2018-10-24 12:36:14,074 INFO L226 Difference]: Without dead ends: 464 [2018-10-24 12:36:14,075 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 648 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:36:14,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2018-10-24 12:36:14,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 314. [2018-10-24 12:36:14,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2018-10-24 12:36:14,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 332 transitions. [2018-10-24 12:36:14,098 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 332 transitions. Word has length 368 [2018-10-24 12:36:14,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:14,098 INFO L481 AbstractCegarLoop]: Abstraction has 314 states and 332 transitions. [2018-10-24 12:36:14,098 INFO L482 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-10-24 12:36:14,098 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 332 transitions. [2018-10-24 12:36:14,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2018-10-24 12:36:14,100 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:14,101 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:14,101 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:14,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:14,101 INFO L82 PathProgramCache]: Analyzing trace with hash 905442825, now seen corresponding path program 43 times [2018-10-24 12:36:14,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:14,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:14,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:14,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:14,102 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:14,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 5194 backedges. 1452 proven. 2202 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-24 12:36:14,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:14,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:14,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:14,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:14,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:14,780 INFO L194 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 [2018-10-24 12:36:14,789 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:14,789 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:14,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:14,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5194 backedges. 1453 proven. 2117 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:15,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:15,967 INFO L134 CoverageAnalysis]: Checked inductivity of 5194 backedges. 1453 proven. 2117 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:36:15,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:15,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 39 [2018-10-24 12:36:15,991 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:15,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:36:15,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:36:15,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:36:15,992 INFO L87 Difference]: Start difference. First operand 314 states and 332 transitions. Second operand 38 states. [2018-10-24 12:36:16,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:16,401 INFO L93 Difference]: Finished difference Result 330 states and 349 transitions. [2018-10-24 12:36:16,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:36:16,402 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 371 [2018-10-24 12:36:16,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:16,405 INFO L225 Difference]: With dead ends: 330 [2018-10-24 12:36:16,405 INFO L226 Difference]: Without dead ends: 328 [2018-10-24 12:36:16,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 810 GetRequests, 712 SyntacticMatches, 59 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1205 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:36:16,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2018-10-24 12:36:16,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 328. [2018-10-24 12:36:16,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-24 12:36:16,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 347 transitions. [2018-10-24 12:36:16,426 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 347 transitions. Word has length 371 [2018-10-24 12:36:16,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:16,427 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 347 transitions. [2018-10-24 12:36:16,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:36:16,427 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 347 transitions. [2018-10-24 12:36:16,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2018-10-24 12:36:16,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:16,430 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:16,430 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:16,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:16,430 INFO L82 PathProgramCache]: Analyzing trace with hash 247740521, now seen corresponding path program 44 times [2018-10-24 12:36:16,431 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:16,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:16,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:16,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:18,247 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 2480 proven. 1395 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:18,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:18,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:18,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:18,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:18,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:18,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:18,277 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:18,277 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:18,453 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:36:18,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:18,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:20,146 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 2480 proven. 1395 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:20,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:21,515 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 2480 proven. 1395 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:21,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:21,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 99 [2018-10-24 12:36:21,537 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:21,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-10-24 12:36:21,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-10-24 12:36:21,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2275, Invalid=7427, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:36:21,539 INFO L87 Difference]: Start difference. First operand 328 states and 347 transitions. Second operand 97 states. [2018-10-24 12:36:28,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:28,376 INFO L93 Difference]: Finished difference Result 655 states and 767 transitions. [2018-10-24 12:36:28,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:36:28,376 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 389 [2018-10-24 12:36:28,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:28,379 INFO L225 Difference]: With dead ends: 655 [2018-10-24 12:36:28,379 INFO L226 Difference]: Without dead ends: 486 [2018-10-24 12:36:28,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 685 SyntacticMatches, 60 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5951 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=4352, Invalid=12418, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:36:28,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-10-24 12:36:28,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 331. [2018-10-24 12:36:28,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2018-10-24 12:36:28,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 350 transitions. [2018-10-24 12:36:28,399 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 350 transitions. Word has length 389 [2018-10-24 12:36:28,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:28,399 INFO L481 AbstractCegarLoop]: Abstraction has 331 states and 350 transitions. [2018-10-24 12:36:28,400 INFO L482 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-10-24 12:36:28,400 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 350 transitions. [2018-10-24 12:36:28,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2018-10-24 12:36:28,402 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:28,402 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:28,403 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:28,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:28,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1056870131, now seen corresponding path program 45 times [2018-10-24 12:36:28,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:28,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:28,404 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:28,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:28,404 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:28,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:29,993 INFO L134 CoverageAnalysis]: Checked inductivity of 5828 backedges. 2480 proven. 1488 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:29,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:29,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:29,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:29,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:29,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:29,994 INFO L194 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 [2018-10-24 12:36:30,001 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:30,001 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:30,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:30,121 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:30,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:31,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5828 backedges. 2480 proven. 1488 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:31,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:33,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5828 backedges. 2480 proven. 1488 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:33,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:33,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 98 [2018-10-24 12:36:33,534 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:33,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-10-24 12:36:33,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-10-24 12:36:33,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:36:33,536 INFO L87 Difference]: Start difference. First operand 331 states and 350 transitions. Second operand 98 states. [2018-10-24 12:36:35,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:35,712 INFO L93 Difference]: Finished difference Result 661 states and 776 transitions. [2018-10-24 12:36:35,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-24 12:36:35,712 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 392 [2018-10-24 12:36:35,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:35,715 INFO L225 Difference]: With dead ends: 661 [2018-10-24 12:36:35,715 INFO L226 Difference]: Without dead ends: 494 [2018-10-24 12:36:35,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 881 GetRequests, 690 SyntacticMatches, 63 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5890 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:36:35,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2018-10-24 12:36:35,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 334. [2018-10-24 12:36:35,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2018-10-24 12:36:35,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 353 transitions. [2018-10-24 12:36:35,739 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 353 transitions. Word has length 392 [2018-10-24 12:36:35,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:35,739 INFO L481 AbstractCegarLoop]: Abstraction has 334 states and 353 transitions. [2018-10-24 12:36:35,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-10-24 12:36:35,740 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 353 transitions. [2018-10-24 12:36:35,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-24 12:36:35,742 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:35,742 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:35,742 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:35,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:35,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1553742359, now seen corresponding path program 46 times [2018-10-24 12:36:35,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:35,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:35,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:35,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:35,744 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:35,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:36,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5924 backedges. 1645 proven. 2509 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-24 12:36:36,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:36,609 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:36,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:36,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:36,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:36,619 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:36,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:36,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:36,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5924 backedges. 1646 proven. 2418 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:36,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:38,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5924 backedges. 1646 proven. 2418 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:38,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:38,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 41 [2018-10-24 12:36:38,086 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:38,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:36:38,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:36:38,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:36:38,087 INFO L87 Difference]: Start difference. First operand 334 states and 353 transitions. Second operand 40 states. [2018-10-24 12:36:38,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:38,552 INFO L93 Difference]: Finished difference Result 350 states and 370 transitions. [2018-10-24 12:36:38,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:36:38,552 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 395 [2018-10-24 12:36:38,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:38,555 INFO L225 Difference]: With dead ends: 350 [2018-10-24 12:36:38,555 INFO L226 Difference]: Without dead ends: 348 [2018-10-24 12:36:38,556 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 758 SyntacticMatches, 63 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:36:38,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2018-10-24 12:36:38,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2018-10-24 12:36:38,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2018-10-24 12:36:38,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 368 transitions. [2018-10-24 12:36:38,577 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 368 transitions. Word has length 395 [2018-10-24 12:36:38,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:38,578 INFO L481 AbstractCegarLoop]: Abstraction has 348 states and 368 transitions. [2018-10-24 12:36:38,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:36:38,578 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 368 transitions. [2018-10-24 12:36:38,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2018-10-24 12:36:38,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:38,580 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:38,581 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:38,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:38,581 INFO L82 PathProgramCache]: Analyzing trace with hash -779104183, now seen corresponding path program 47 times [2018-10-24 12:36:38,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:38,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:38,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:38,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:38,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:38,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:40,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 2805 proven. 1584 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:40,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:40,304 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:40,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:40,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:40,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:40,304 INFO L194 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 [2018-10-24 12:36:40,313 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:40,313 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:40,498 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-24 12:36:40,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:40,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:42,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 2805 proven. 1584 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:42,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:44,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 2805 proven. 1584 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:44,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:44,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 105 [2018-10-24 12:36:44,305 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:44,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 103 states [2018-10-24 12:36:44,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2018-10-24 12:36:44,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2553, Invalid=8367, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:36:44,307 INFO L87 Difference]: Start difference. First operand 348 states and 368 transitions. Second operand 103 states. [2018-10-24 12:36:46,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:46,853 INFO L93 Difference]: Finished difference Result 695 states and 814 transitions. [2018-10-24 12:36:46,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:36:46,854 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 413 [2018-10-24 12:36:46,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:46,856 INFO L225 Difference]: With dead ends: 695 [2018-10-24 12:36:46,856 INFO L226 Difference]: Without dead ends: 516 [2018-10-24 12:36:46,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 927 GetRequests, 727 SyntacticMatches, 64 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6731 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4896, Invalid=14010, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:36:46,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2018-10-24 12:36:46,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 351. [2018-10-24 12:36:46,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-10-24 12:36:46,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 371 transitions. [2018-10-24 12:36:46,877 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 371 transitions. Word has length 413 [2018-10-24 12:36:46,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:46,877 INFO L481 AbstractCegarLoop]: Abstraction has 351 states and 371 transitions. [2018-10-24 12:36:46,878 INFO L482 AbstractCegarLoop]: Interpolant automaton has 103 states. [2018-10-24 12:36:46,878 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 371 transitions. [2018-10-24 12:36:46,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2018-10-24 12:36:46,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:46,880 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:46,880 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:46,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:46,881 INFO L82 PathProgramCache]: Analyzing trace with hash 479616237, now seen corresponding path program 48 times [2018-10-24 12:36:46,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:46,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:46,881 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:46,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:46,881 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:46,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:48,822 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 2805 proven. 1683 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:48,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:48,823 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:48,823 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:48,823 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:48,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:48,823 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:48,831 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:48,831 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:48,958 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:48,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:48,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:50,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 2805 proven. 1683 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:50,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:52,402 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 2805 proven. 1683 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:52,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:52,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 104 [2018-10-24 12:36:52,426 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:52,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-10-24 12:36:52,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-10-24 12:36:52,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:36:52,428 INFO L87 Difference]: Start difference. First operand 351 states and 371 transitions. Second operand 104 states. [2018-10-24 12:36:55,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:55,108 INFO L93 Difference]: Finished difference Result 701 states and 823 transitions. [2018-10-24 12:36:55,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:36:55,109 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 416 [2018-10-24 12:36:55,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:55,112 INFO L225 Difference]: With dead ends: 701 [2018-10-24 12:36:55,112 INFO L226 Difference]: Without dead ends: 524 [2018-10-24 12:36:55,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 935 GetRequests, 732 SyntacticMatches, 67 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6666 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:36:55,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2018-10-24 12:36:55,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 354. [2018-10-24 12:36:55,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 354 states. [2018-10-24 12:36:55,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 374 transitions. [2018-10-24 12:36:55,139 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 374 transitions. Word has length 416 [2018-10-24 12:36:55,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:55,140 INFO L481 AbstractCegarLoop]: Abstraction has 354 states and 374 transitions. [2018-10-24 12:36:55,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-10-24 12:36:55,140 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 374 transitions. [2018-10-24 12:36:55,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2018-10-24 12:36:55,142 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:55,143 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:55,143 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:55,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:55,143 INFO L82 PathProgramCache]: Analyzing trace with hash -339812919, now seen corresponding path program 49 times [2018-10-24 12:36:55,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:55,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:55,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:55,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:55,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:55,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:56,363 INFO L134 CoverageAnalysis]: Checked inductivity of 6702 backedges. 1850 proven. 2836 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:36:56,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:56,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:56,364 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:56,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:56,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:56,364 INFO L194 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 [2018-10-24 12:36:56,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:56,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:56,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:56,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:56,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6702 backedges. 1851 proven. 2739 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:56,688 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:57,708 INFO L134 CoverageAnalysis]: Checked inductivity of 6702 backedges. 1851 proven. 2739 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:57,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:57,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 43 [2018-10-24 12:36:57,729 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:57,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:36:57,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:36:57,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:36:57,731 INFO L87 Difference]: Start difference. First operand 354 states and 374 transitions. Second operand 42 states. [2018-10-24 12:36:58,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:58,422 INFO L93 Difference]: Finished difference Result 370 states and 391 transitions. [2018-10-24 12:36:58,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:36:58,422 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 419 [2018-10-24 12:36:58,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:58,425 INFO L225 Difference]: With dead ends: 370 [2018-10-24 12:36:58,425 INFO L226 Difference]: Without dead ends: 368 [2018-10-24 12:36:58,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 914 GetRequests, 804 SyntacticMatches, 67 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1501 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:36:58,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2018-10-24 12:36:58,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 368. [2018-10-24 12:36:58,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2018-10-24 12:36:58,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 389 transitions. [2018-10-24 12:36:58,444 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 389 transitions. Word has length 419 [2018-10-24 12:36:58,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:58,444 INFO L481 AbstractCegarLoop]: Abstraction has 368 states and 389 transitions. [2018-10-24 12:36:58,444 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:36:58,444 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 389 transitions. [2018-10-24 12:36:58,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2018-10-24 12:36:58,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:58,447 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:58,447 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:58,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:58,448 INFO L82 PathProgramCache]: Analyzing trace with hash 487108649, now seen corresponding path program 50 times [2018-10-24 12:36:58,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:58,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:58,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:58,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:58,449 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:58,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 7315 backedges. 3150 proven. 1785 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:00,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:00,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:00,212 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:00,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:00,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:00,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:00,221 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:00,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:00,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:37:00,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:00,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:02,588 INFO L134 CoverageAnalysis]: Checked inductivity of 7315 backedges. 3150 proven. 1785 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:02,588 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:04,563 INFO L134 CoverageAnalysis]: Checked inductivity of 7315 backedges. 3150 proven. 1785 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:04,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:04,585 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 111 [2018-10-24 12:37:04,585 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:04,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 109 states [2018-10-24 12:37:04,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2018-10-24 12:37:04,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2847, Invalid=9363, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:37:04,587 INFO L87 Difference]: Start difference. First operand 368 states and 389 transitions. Second operand 109 states. [2018-10-24 12:37:07,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:07,209 INFO L93 Difference]: Finished difference Result 735 states and 861 transitions. [2018-10-24 12:37:07,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-24 12:37:07,209 INFO L78 Accepts]: Start accepts. Automaton has 109 states. Word has length 437 [2018-10-24 12:37:07,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:07,212 INFO L225 Difference]: With dead ends: 735 [2018-10-24 12:37:07,212 INFO L226 Difference]: Without dead ends: 546 [2018-10-24 12:37:07,214 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 981 GetRequests, 769 SyntacticMatches, 68 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7559 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=5472, Invalid=15698, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:37:07,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2018-10-24 12:37:07,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 371. [2018-10-24 12:37:07,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 371 states. [2018-10-24 12:37:07,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 392 transitions. [2018-10-24 12:37:07,234 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 392 transitions. Word has length 437 [2018-10-24 12:37:07,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:07,234 INFO L481 AbstractCegarLoop]: Abstraction has 371 states and 392 transitions. [2018-10-24 12:37:07,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 109 states. [2018-10-24 12:37:07,234 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 392 transitions. [2018-10-24 12:37:07,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 441 [2018-10-24 12:37:07,237 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:07,237 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:07,237 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:07,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:07,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1327272141, now seen corresponding path program 51 times [2018-10-24 12:37:07,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:07,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:07,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:07,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:07,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:07,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:09,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7420 backedges. 3150 proven. 1890 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:09,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:09,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:09,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:09,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:09,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:09,488 INFO L194 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 [2018-10-24 12:37:09,496 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:09,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:09,630 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:09,630 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:09,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:12,052 INFO L134 CoverageAnalysis]: Checked inductivity of 7420 backedges. 3150 proven. 1890 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:12,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 7420 backedges. 3150 proven. 1890 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:14,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:14,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 110 [2018-10-24 12:37:14,053 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:14,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-10-24 12:37:14,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-10-24 12:37:14,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:37:14,055 INFO L87 Difference]: Start difference. First operand 371 states and 392 transitions. Second operand 110 states. [2018-10-24 12:37:16,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:16,901 INFO L93 Difference]: Finished difference Result 741 states and 870 transitions. [2018-10-24 12:37:16,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-10-24 12:37:16,901 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 440 [2018-10-24 12:37:16,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:16,903 INFO L225 Difference]: With dead ends: 741 [2018-10-24 12:37:16,903 INFO L226 Difference]: Without dead ends: 554 [2018-10-24 12:37:16,905 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 774 SyntacticMatches, 71 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:37:16,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-10-24 12:37:16,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 374. [2018-10-24 12:37:16,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-10-24 12:37:16,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 395 transitions. [2018-10-24 12:37:16,927 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 395 transitions. Word has length 440 [2018-10-24 12:37:16,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:16,927 INFO L481 AbstractCegarLoop]: Abstraction has 374 states and 395 transitions. [2018-10-24 12:37:16,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-10-24 12:37:16,927 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 395 transitions. [2018-10-24 12:37:16,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2018-10-24 12:37:16,930 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:16,930 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:16,930 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:16,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:16,931 INFO L82 PathProgramCache]: Analyzing trace with hash -431538775, now seen corresponding path program 52 times [2018-10-24 12:37:16,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:16,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:16,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:16,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:16,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:16,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:17,762 INFO L134 CoverageAnalysis]: Checked inductivity of 7528 backedges. 2067 proven. 3183 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-10-24 12:37:17,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:17,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:17,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:17,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:17,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:17,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:17,793 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:17,793 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:17,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:17,938 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:18,113 INFO L134 CoverageAnalysis]: Checked inductivity of 7528 backedges. 2068 proven. 3080 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:18,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:19,597 INFO L134 CoverageAnalysis]: Checked inductivity of 7528 backedges. 2068 proven. 3080 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:37:19,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:19,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 45 [2018-10-24 12:37:19,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:19,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:37:19,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:37:19,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:37:19,620 INFO L87 Difference]: Start difference. First operand 374 states and 395 transitions. Second operand 44 states. [2018-10-24 12:37:20,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:20,243 INFO L93 Difference]: Finished difference Result 390 states and 412 transitions. [2018-10-24 12:37:20,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:37:20,244 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 443 [2018-10-24 12:37:20,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:20,246 INFO L225 Difference]: With dead ends: 390 [2018-10-24 12:37:20,247 INFO L226 Difference]: Without dead ends: 388 [2018-10-24 12:37:20,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 850 SyntacticMatches, 71 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1661 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:37:20,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-10-24 12:37:20,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 388. [2018-10-24 12:37:20,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 388 states. [2018-10-24 12:37:20,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 410 transitions. [2018-10-24 12:37:20,267 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 410 transitions. Word has length 443 [2018-10-24 12:37:20,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:20,267 INFO L481 AbstractCegarLoop]: Abstraction has 388 states and 410 transitions. [2018-10-24 12:37:20,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:37:20,267 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 410 transitions. [2018-10-24 12:37:20,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2018-10-24 12:37:20,269 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:20,269 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:20,270 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:20,270 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:20,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1259546615, now seen corresponding path program 53 times [2018-10-24 12:37:20,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:20,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:20,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:20,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:20,271 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:20,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:22,259 INFO L134 CoverageAnalysis]: Checked inductivity of 8177 backedges. 3515 proven. 1998 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:22,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:22,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:22,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:22,260 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:22,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:22,260 INFO L194 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 [2018-10-24 12:37:22,268 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:22,268 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:22,486 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-24 12:37:22,487 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:22,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:25,186 INFO L134 CoverageAnalysis]: Checked inductivity of 8177 backedges. 3515 proven. 1998 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:25,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:27,086 INFO L134 CoverageAnalysis]: Checked inductivity of 8177 backedges. 3515 proven. 1998 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:27,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:27,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 117 [2018-10-24 12:37:27,111 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:27,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 115 states [2018-10-24 12:37:27,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2018-10-24 12:37:27,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3157, Invalid=10415, Unknown=0, NotChecked=0, Total=13572 [2018-10-24 12:37:27,112 INFO L87 Difference]: Start difference. First operand 388 states and 410 transitions. Second operand 115 states. [2018-10-24 12:37:30,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:30,444 INFO L93 Difference]: Finished difference Result 775 states and 908 transitions. [2018-10-24 12:37:30,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-24 12:37:30,444 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 461 [2018-10-24 12:37:30,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:30,447 INFO L225 Difference]: With dead ends: 775 [2018-10-24 12:37:30,447 INFO L226 Difference]: Without dead ends: 576 [2018-10-24 12:37:30,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1035 GetRequests, 811 SyntacticMatches, 72 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8435 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6080, Invalid=17482, Unknown=0, NotChecked=0, Total=23562 [2018-10-24 12:37:30,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2018-10-24 12:37:30,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 391. [2018-10-24 12:37:30,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-10-24 12:37:30,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 413 transitions. [2018-10-24 12:37:30,473 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 413 transitions. Word has length 461 [2018-10-24 12:37:30,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:30,473 INFO L481 AbstractCegarLoop]: Abstraction has 391 states and 413 transitions. [2018-10-24 12:37:30,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 115 states. [2018-10-24 12:37:30,474 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 413 transitions. [2018-10-24 12:37:30,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2018-10-24 12:37:30,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:30,476 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:30,476 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:30,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:30,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1873670995, now seen corresponding path program 54 times [2018-10-24 12:37:30,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:30,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:30,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:30,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:30,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:30,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:32,493 INFO L134 CoverageAnalysis]: Checked inductivity of 8288 backedges. 3515 proven. 2109 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:32,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:32,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:32,494 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:32,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:32,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:32,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:32,502 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:32,502 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:32,645 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:32,645 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:32,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:35,299 INFO L134 CoverageAnalysis]: Checked inductivity of 8288 backedges. 3515 proven. 2109 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:35,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:37,137 INFO L134 CoverageAnalysis]: Checked inductivity of 8288 backedges. 3515 proven. 2109 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:37,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:37,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 116 [2018-10-24 12:37:37,159 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:37,160 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-10-24 12:37:37,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-10-24 12:37:37,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:37:37,161 INFO L87 Difference]: Start difference. First operand 391 states and 413 transitions. Second operand 116 states. [2018-10-24 12:37:40,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:40,974 INFO L93 Difference]: Finished difference Result 781 states and 917 transitions. [2018-10-24 12:37:40,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-10-24 12:37:40,974 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 464 [2018-10-24 12:37:40,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:40,977 INFO L225 Difference]: With dead ends: 781 [2018-10-24 12:37:40,977 INFO L226 Difference]: Without dead ends: 584 [2018-10-24 12:37:40,979 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 816 SyntacticMatches, 75 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8362 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2018-10-24 12:37:40,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2018-10-24 12:37:41,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 394. [2018-10-24 12:37:41,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-24 12:37:41,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 416 transitions. [2018-10-24 12:37:41,003 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 416 transitions. Word has length 464 [2018-10-24 12:37:41,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:41,004 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 416 transitions. [2018-10-24 12:37:41,004 INFO L482 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-10-24 12:37:41,004 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 416 transitions. [2018-10-24 12:37:41,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2018-10-24 12:37:41,006 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:41,006 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:41,006 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:41,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:41,007 INFO L82 PathProgramCache]: Analyzing trace with hash -692394615, now seen corresponding path program 55 times [2018-10-24 12:37:41,007 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:41,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:41,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:41,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:41,008 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:41,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:42,116 INFO L134 CoverageAnalysis]: Checked inductivity of 8402 backedges. 2296 proven. 3550 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-10-24 12:37:42,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:42,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:42,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:42,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:42,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:42,117 INFO L194 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 [2018-10-24 12:37:42,124 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:42,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:42,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:42,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:42,490 INFO L134 CoverageAnalysis]: Checked inductivity of 8402 backedges. 2297 proven. 3441 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:42,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:43,721 INFO L134 CoverageAnalysis]: Checked inductivity of 8402 backedges. 2297 proven. 3441 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:43,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:43,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 47 [2018-10-24 12:37:43,742 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:43,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:37:43,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:37:43,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=873, Invalid=1289, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:37:43,744 INFO L87 Difference]: Start difference. First operand 394 states and 416 transitions. Second operand 46 states. [2018-10-24 12:37:44,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:44,980 INFO L93 Difference]: Finished difference Result 410 states and 433 transitions. [2018-10-24 12:37:44,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:37:44,981 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 467 [2018-10-24 12:37:44,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:44,983 INFO L225 Difference]: With dead ends: 410 [2018-10-24 12:37:44,983 INFO L226 Difference]: Without dead ends: 408 [2018-10-24 12:37:44,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 896 SyntacticMatches, 75 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=886, Invalid=1466, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:37:44,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-10-24 12:37:45,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2018-10-24 12:37:45,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2018-10-24 12:37:45,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 431 transitions. [2018-10-24 12:37:45,006 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 431 transitions. Word has length 467 [2018-10-24 12:37:45,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:45,006 INFO L481 AbstractCegarLoop]: Abstraction has 408 states and 431 transitions. [2018-10-24 12:37:45,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:37:45,006 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 431 transitions. [2018-10-24 12:37:45,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2018-10-24 12:37:45,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:45,008 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:45,009 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:45,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:45,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1451603991, now seen corresponding path program 56 times [2018-10-24 12:37:45,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:45,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:45,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:45,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:45,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:45,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 3900 proven. 2223 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:47,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:47,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:47,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:47,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:47,184 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:47,184 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:47,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-24 12:37:47,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:47,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 3900 proven. 2223 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:50,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 3900 proven. 2223 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:52,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:52,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 123 [2018-10-24 12:37:52,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:52,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 121 states [2018-10-24 12:37:52,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2018-10-24 12:37:52,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3483, Invalid=11523, Unknown=0, NotChecked=0, Total=15006 [2018-10-24 12:37:52,520 INFO L87 Difference]: Start difference. First operand 408 states and 431 transitions. Second operand 121 states. [2018-10-24 12:37:56,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:56,007 INFO L93 Difference]: Finished difference Result 815 states and 955 transitions. [2018-10-24 12:37:56,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-10-24 12:37:56,007 INFO L78 Accepts]: Start accepts. Automaton has 121 states. Word has length 485 [2018-10-24 12:37:56,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:56,010 INFO L225 Difference]: With dead ends: 815 [2018-10-24 12:37:56,010 INFO L226 Difference]: Without dead ends: 606 [2018-10-24 12:37:56,012 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1089 GetRequests, 853 SyntacticMatches, 76 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9359 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6720, Invalid=19362, Unknown=0, NotChecked=0, Total=26082 [2018-10-24 12:37:56,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2018-10-24 12:37:56,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 411. [2018-10-24 12:37:56,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 411 states. [2018-10-24 12:37:56,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 434 transitions. [2018-10-24 12:37:56,035 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 434 transitions. Word has length 485 [2018-10-24 12:37:56,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:56,035 INFO L481 AbstractCegarLoop]: Abstraction has 411 states and 434 transitions. [2018-10-24 12:37:56,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 121 states. [2018-10-24 12:37:56,036 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 434 transitions. [2018-10-24 12:37:56,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2018-10-24 12:37:56,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:56,038 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:56,038 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:56,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:56,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1685377165, now seen corresponding path program 57 times [2018-10-24 12:37:56,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:56,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:56,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:56,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-24 12:37:56,552 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:37:56,556 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:37:56,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:37:56 BoogieIcfgContainer [2018-10-24 12:37:56,557 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:37:56,557 INFO L168 Benchmark]: Toolchain (without parser) took 229271.61 ms. Allocated memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: 1.1 GB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -199.6 MB). Peak memory consumption was 913.0 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:56,558 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:56,559 INFO L168 Benchmark]: CACSL2BoogieTranslator took 346.18 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:56,559 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:56,560 INFO L168 Benchmark]: Boogie Preprocessor took 41.74 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:56,560 INFO L168 Benchmark]: RCFGBuilder took 518.97 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 736.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -792.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:56,561 INFO L168 Benchmark]: TraceAbstraction took 228329.70 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 376.4 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 582.5 MB). Peak memory consumption was 958.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:56,565 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 346.18 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 27.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 41.74 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 518.97 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 736.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -792.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 228329.70 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 376.4 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 582.5 MB). Peak memory consumption was 958.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 489 with TraceHistMax 40,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 32 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 30 locations, 1 error locations. TIMEOUT Result, 228.2s OverallTime, 60 OverallIterations, 40 TraceHistogramMax, 74.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4798 SDtfs, 9849 SDslu, 47934 SDs, 0 SdLazy, 38252 SolverSat, 5510 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 39.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 32427 GetRequests, 26432 SyntacticMatches, 2237 SemanticMatches, 3758 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136409 ImplicationChecksByTransitivity, 143.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=411occurred in iteration=59, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.9s AutomataMinimizationTime, 59 MinimizatonAttempts, 3905 StatesRemovedByMinimization, 41 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 6.1s SatisfiabilityAnalysisTime, 139.4s InterpolantComputationTime, 29161 NumberOfCodeBlocks, 29161 NumberOfCodeBlocksAsserted, 531 NumberOfCheckSat, 43538 ConstructedInterpolants, 0 QuantifiedInterpolants, 42473608 SizeOfPredicates, 150 NumberOfNonLiveVariables, 35027 ConjunctsInSsa, 2516 ConjunctsInUnsatCore, 171 InterpolantComputations, 3 PerfectInterpolantSequences, 368269/527315 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown