java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:17:00,588 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:17:00,594 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:17:00,611 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:17:00,611 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:17:00,612 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:17:00,614 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:17:00,616 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:17:00,617 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:17:00,618 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:17:00,619 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:17:00,619 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:17:00,620 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:17:00,621 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:17:00,623 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:17:00,625 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:17:00,626 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:17:00,630 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:17:00,636 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:17:00,642 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:17:00,643 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:17:00,646 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:17:00,652 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:17:00,653 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:17:00,653 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:17:00,654 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:17:00,656 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:17:00,657 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:17:00,657 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:17:00,662 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:17:00,662 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:17:00,664 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 22:17:00,665 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 22:17:00,665 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 22:17:00,666 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 22:17:00,667 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 22:17:00,667 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:17:00,696 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:17:00,696 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:17:00,697 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:17:00,697 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:17:00,697 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:17:00,698 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:17:00,698 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:17:00,698 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:17:00,698 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:17:00,698 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:17:00,701 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:17:00,702 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:17:00,702 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:17:00,703 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:17:00,703 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:17:00,703 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:17:00,703 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:17:00,704 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:17:00,705 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:17:00,705 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:17:00,706 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:17:00,706 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:17:00,706 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:17:00,706 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:17:00,706 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:17:00,707 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:17:00,707 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:17:00,707 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:17:00,708 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:17:00,708 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:17:00,708 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:17:00,708 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:17:00,708 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:17:00,709 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:17:00,709 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:17:00,777 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:17:00,796 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:17:00,800 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:17:00,802 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:17:00,802 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:17:00,803 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_false-unreach-call1.c [2018-11-07 22:17:00,877 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2257b6313/3a95a43b09cf4975a3c0a0dc81122556/FLAG576481453 [2018-11-07 22:17:01,353 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:17:01,354 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_false-unreach-call1.c [2018-11-07 22:17:01,362 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2257b6313/3a95a43b09cf4975a3c0a0dc81122556/FLAG576481453 [2018-11-07 22:17:01,384 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2257b6313/3a95a43b09cf4975a3c0a0dc81122556 [2018-11-07 22:17:01,398 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:17:01,400 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:17:01,401 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:17:01,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:17:01,407 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:17:01,408 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,413 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a760589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01, skipping insertion in model container [2018-11-07 22:17:01,414 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,425 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:17:01,451 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:17:01,653 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:17:01,658 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:17:01,676 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:17:01,694 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:17:01,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01 WrapperNode [2018-11-07 22:17:01,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:17:01,696 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:17:01,696 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:17:01,696 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:17:01,708 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,715 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,720 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:17:01,721 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:17:01,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:17:01,721 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:17:01,731 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,732 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,740 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... [2018-11-07 22:17:01,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:17:01,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:17:01,742 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:17:01,742 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:17:01,743 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:01,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:17:01,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:17:01,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:17:01,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:17:01,879 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:17:01,879 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:17:01,881 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:17:01,881 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:17:02,138 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:17:02,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:17:02 BoogieIcfgContainer [2018-11-07 22:17:02,139 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:17:02,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:17:02,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:17:02,143 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:17:02,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:17:01" (1/3) ... [2018-11-07 22:17:02,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@351a2652 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:17:02, skipping insertion in model container [2018-11-07 22:17:02,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:01" (2/3) ... [2018-11-07 22:17:02,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@351a2652 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:17:02, skipping insertion in model container [2018-11-07 22:17:02,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:17:02" (3/3) ... [2018-11-07 22:17:02,147 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono1_false-unreach-call1.c [2018-11-07 22:17:02,158 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:17:02,166 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:17:02,185 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:17:02,220 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:17:02,220 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:17:02,220 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:17:02,220 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:17:02,220 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:17:02,221 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:17:02,222 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:17:02,222 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:17:02,242 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-07 22:17:02,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:17:02,249 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:02,251 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:02,254 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:02,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:02,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-11-07 22:17:02,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:02,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:02,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,316 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:02,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:02,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:02,373 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:17:02,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:17:02,374 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:02,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:17:02,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:17:02,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:17:02,394 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-11-07 22:17:02,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:02,417 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-11-07 22:17:02,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:17:02,419 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:17:02,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:02,427 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:17:02,427 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 22:17:02,431 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:17:02,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 22:17:02,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 22:17:02,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 22:17:02,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-07 22:17:02,473 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-07 22:17:02,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:02,473 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-07 22:17:02,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:17:02,474 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-07 22:17:02,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:17:02,475 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:02,475 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:02,475 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:02,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:02,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-11-07 22:17:02,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:02,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:02,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:02,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:02,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:02,653 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:17:02,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:17:02,653 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:02,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:17:02,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:17:02,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:17:02,658 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-11-07 22:17:02,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:02,787 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-11-07 22:17:02,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:17:02,788 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:17:02,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:02,790 INFO L225 Difference]: With dead ends: 24 [2018-11-07 22:17:02,790 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:17:02,791 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:17:02,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:17:02,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 22:17:02,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 22:17:02,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-11-07 22:17:02,804 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-11-07 22:17:02,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:02,805 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-11-07 22:17:02,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:17:02,807 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-11-07 22:17:02,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:17:02,808 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:02,809 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:02,809 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:02,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:02,816 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-11-07 22:17:02,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:02,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:02,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:02,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:02,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:03,029 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:03,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:03,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:03,031 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 22:17:03,033 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:17:03,070 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:17:03,071 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:17:03,177 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:17:03,310 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:17:03,311 INFO L272 AbstractInterpreter]: Visited 13 different actions 69 times. Merged at 4 different actions 30 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 22:17:03,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:03,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:17:03,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:03,329 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:03,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:03,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:03,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:03,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:03,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:03,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:03,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:03,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:03,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 9 [2018-11-07 22:17:03,754 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:03,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:17:03,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:17:03,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:17:03,756 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-11-07 22:17:03,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:03,819 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 22:17:03,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:17:03,820 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 22:17:03,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:03,821 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:17:03,821 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 22:17:03,822 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:17:03,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 22:17:03,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-07 22:17:03,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 22:17:03,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-07 22:17:03,827 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-11-07 22:17:03,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:03,827 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-07 22:17:03,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:17:03,828 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-07 22:17:03,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 22:17:03,829 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:03,829 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:03,829 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:03,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:03,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-11-07 22:17:03,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:03,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:03,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:03,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:03,832 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:03,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:04,061 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:04,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:04,062 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:04,062 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:04,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:04,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:04,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:04,077 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:04,077 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:04,114 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:17:04,114 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:04,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:04,137 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:17:04,137 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:04,315 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:17:04,336 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 22:17:04,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 6] imperfect sequences [5] total 10 [2018-11-07 22:17:04,337 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:04,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:17:04,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:17:04,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:17:04,341 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-11-07 22:17:04,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:04,390 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-11-07 22:17:04,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:17:04,391 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 22:17:04,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:04,392 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:17:04,392 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:17:04,393 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:17:04,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:17:04,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:17:04,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:17:04,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 22:17:04,399 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-11-07 22:17:04,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:04,399 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 22:17:04,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:17:04,400 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 22:17:04,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 22:17:04,400 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:04,401 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:04,401 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:04,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:04,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-11-07 22:17:04,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:04,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,403 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:04,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,403 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:04,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:04,667 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:04,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:04,668 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:04,668 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-11-07 22:17:04,668 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:17:04,670 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:17:04,670 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:17:04,675 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:17:04,803 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:17:04,804 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 4 times. Found 9 fixpoints after 2 different actions. Largest state had 2 variables. [2018-11-07 22:17:04,842 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:04,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:17:04,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:04,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:04,853 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:04,853 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:04,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:04,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:04,955 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:04,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:05,117 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:05,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:05,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-11-07 22:17:05,141 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:05,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:17:05,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:17:05,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:17:05,143 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-11-07 22:17:05,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:05,516 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 22:17:05,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:17:05,517 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 22:17:05,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:05,518 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:17:05,518 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 22:17:05,519 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:17:05,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 22:17:05,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-07 22:17:05,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:17:05,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-07 22:17:05,525 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-11-07 22:17:05,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:05,526 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-07 22:17:05,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:17:05,526 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-07 22:17:05,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:17:05,526 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:05,527 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:05,527 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:05,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:05,527 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-11-07 22:17:05,528 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:05,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:05,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:05,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:05,529 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:05,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:05,697 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:05,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:05,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:05,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:05,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:05,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:05,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:05,709 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:05,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:05,718 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:17:05,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:05,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:05,812 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:17:05,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:06,109 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:17:06,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:06,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 8] total 15 [2018-11-07 22:17:06,131 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:06,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:17:06,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:17:06,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:17:06,132 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-11-07 22:17:06,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:06,262 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2018-11-07 22:17:06,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:17:06,262 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-11-07 22:17:06,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:06,264 INFO L225 Difference]: With dead ends: 41 [2018-11-07 22:17:06,264 INFO L226 Difference]: Without dead ends: 31 [2018-11-07 22:17:06,265 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:17:06,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-11-07 22:17:06,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-11-07 22:17:06,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-11-07 22:17:06,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-11-07 22:17:06,271 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 23 [2018-11-07 22:17:06,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:06,271 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-11-07 22:17:06,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:17:06,272 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-11-07 22:17:06,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 22:17:06,273 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:06,273 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:06,273 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:06,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:06,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-11-07 22:17:06,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:06,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:06,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,275 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:06,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:06,490 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:06,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:06,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:06,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:06,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:06,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:06,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:06,501 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:06,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:06,524 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:06,524 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:06,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:06,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:06,839 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:06,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:06,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-11-07 22:17:06,870 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:06,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:17:06,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:17:06,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:17:06,872 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 9 states. [2018-11-07 22:17:07,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:07,025 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2018-11-07 22:17:07,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:17:07,026 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 22:17:07,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:07,027 INFO L225 Difference]: With dead ends: 48 [2018-11-07 22:17:07,028 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:17:07,030 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:17:07,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:17:07,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 22:17:07,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 22:17:07,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2018-11-07 22:17:07,036 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2018-11-07 22:17:07,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:07,036 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2018-11-07 22:17:07,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:17:07,037 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2018-11-07 22:17:07,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 22:17:07,038 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:07,038 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:07,038 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:07,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:07,039 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-11-07 22:17:07,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:07,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:07,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:07,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:07,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:07,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:07,419 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:07,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:07,420 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:07,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:07,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:07,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:07,430 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:07,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:07,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:07,508 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:07,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:07,852 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:07,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:07,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-11-07 22:17:07,873 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:07,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:17:07,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:17:07,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:17:07,876 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 10 states. [2018-11-07 22:17:08,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:08,021 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2018-11-07 22:17:08,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:17:08,024 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 22:17:08,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:08,024 INFO L225 Difference]: With dead ends: 51 [2018-11-07 22:17:08,025 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 22:17:08,025 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:17:08,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 22:17:08,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-11-07 22:17:08,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 22:17:08,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2018-11-07 22:17:08,031 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2018-11-07 22:17:08,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:08,031 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2018-11-07 22:17:08,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:17:08,032 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2018-11-07 22:17:08,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:17:08,033 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:08,033 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:08,033 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:08,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:08,034 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-11-07 22:17:08,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:08,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:08,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:08,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:08,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:08,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:08,311 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:08,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:08,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:08,312 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:08,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:08,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:08,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:08,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:08,322 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:08,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:17:08,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:08,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:08,942 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:17:08,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:09,183 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:17:09,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:09,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 9] total 21 [2018-11-07 22:17:09,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:09,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:17:09,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:17:09,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=315, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:17:09,207 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 14 states. [2018-11-07 22:17:17,692 WARN L179 SmtUtils]: Spent 3.89 s on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:17:17,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:17,817 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2018-11-07 22:17:17,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:17:17,817 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-11-07 22:17:17,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:17,819 INFO L225 Difference]: With dead ends: 60 [2018-11-07 22:17:17,819 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:17:17,820 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=127, Invalid=378, Unknown=1, NotChecked=0, Total=506 [2018-11-07 22:17:17,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:17:17,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-11-07 22:17:17,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 22:17:17,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2018-11-07 22:17:17,828 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 35 [2018-11-07 22:17:17,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:17,828 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2018-11-07 22:17:17,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:17:17,829 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2018-11-07 22:17:17,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 22:17:17,830 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:17,830 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:17,830 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:17,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:17,831 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-11-07 22:17:17,831 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:17,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:17,832 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:17,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:17,832 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:17,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:18,072 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:18,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:18,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:18,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:18,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:18,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:18,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:18,094 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:18,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:18,126 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:18,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:18,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:18,202 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:18,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:18,681 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:18,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:18,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-11-07 22:17:18,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:18,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:17:18,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:17:18,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:17:18,704 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 13 states. [2018-11-07 22:17:18,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:18,946 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2018-11-07 22:17:18,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:17:18,947 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 22:17:18,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:18,948 INFO L225 Difference]: With dead ends: 63 [2018-11-07 22:17:18,948 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:17:18,949 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:17:18,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:17:18,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-11-07 22:17:18,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-07 22:17:18,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2018-11-07 22:17:18,956 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2018-11-07 22:17:18,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:18,956 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2018-11-07 22:17:18,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:17:18,956 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2018-11-07 22:17:18,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:17:18,957 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:18,958 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:18,958 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:18,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:18,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-11-07 22:17:18,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:18,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:18,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:18,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:18,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:18,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:19,373 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:19,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:19,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:19,374 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:19,374 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:19,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:19,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:19,385 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:19,386 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:19,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:19,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:17:19,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:20,452 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:17:20,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:20,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-11-07 22:17:20,473 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:20,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:17:20,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:17:20,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:17:20,475 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 14 states. [2018-11-07 22:17:20,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:20,694 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2018-11-07 22:17:20,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:17:20,695 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 22:17:20,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:20,696 INFO L225 Difference]: With dead ends: 66 [2018-11-07 22:17:20,696 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 22:17:20,697 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:17:20,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 22:17:20,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-11-07 22:17:20,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-07 22:17:20,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-11-07 22:17:20,703 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-11-07 22:17:20,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:20,703 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-11-07 22:17:20,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:17:20,704 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-11-07 22:17:20,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 22:17:20,704 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:20,704 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:20,705 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:20,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:20,705 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-11-07 22:17:20,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:20,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:20,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:20,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:20,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:20,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:21,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:21,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:21,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:21,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:21,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:21,254 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:21,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:21,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:21,287 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:17:21,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:21,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:21,562 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:17:21,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:21,947 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:17:21,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:21,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 10] total 27 [2018-11-07 22:17:21,969 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:21,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:17:21,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:17:21,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:17:21,970 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 19 states. [2018-11-07 22:17:23,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:23,193 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2018-11-07 22:17:23,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:17:23,193 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-11-07 22:17:23,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:23,194 INFO L225 Difference]: With dead ends: 75 [2018-11-07 22:17:23,194 INFO L226 Difference]: Without dead ends: 58 [2018-11-07 22:17:23,195 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=209, Invalid=661, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:17:23,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-07 22:17:23,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2018-11-07 22:17:23,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-07 22:17:23,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2018-11-07 22:17:23,202 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 47 [2018-11-07 22:17:23,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:23,202 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2018-11-07 22:17:23,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:17:23,202 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2018-11-07 22:17:23,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 22:17:23,203 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:23,203 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:23,204 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:23,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:23,204 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-11-07 22:17:23,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:23,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:23,205 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:23,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:23,205 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:23,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:23,504 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:23,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:23,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:23,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:23,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:23,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:23,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:23,523 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:23,523 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:23,566 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:23,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:23,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:23,868 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:17:23,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:24,579 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:17:24,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:24,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-11-07 22:17:24,599 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:24,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:17:24,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:17:24,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:17:24,601 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 17 states. [2018-11-07 22:17:24,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:24,892 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2018-11-07 22:17:24,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:17:24,896 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 22:17:24,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:24,897 INFO L225 Difference]: With dead ends: 81 [2018-11-07 22:17:24,897 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 22:17:24,898 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:17:24,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 22:17:24,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-07 22:17:24,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-07 22:17:24,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2018-11-07 22:17:24,905 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 53 [2018-11-07 22:17:24,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:24,906 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2018-11-07 22:17:24,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:17:24,906 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2018-11-07 22:17:24,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 22:17:24,907 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:24,907 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:24,908 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:24,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:24,908 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 10 times [2018-11-07 22:17:24,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:24,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:24,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:24,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:24,909 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:24,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:25,386 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:25,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:25,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:25,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:25,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:25,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:25,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:25,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:25,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:25,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:25,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:25,599 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:17:25,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:26,739 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:17:26,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:26,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15, 16] total 33 [2018-11-07 22:17:26,759 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:26,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:17:26,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:17:26,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:17:26,760 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 19 states. [2018-11-07 22:17:27,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:27,133 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2018-11-07 22:17:27,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:17:27,134 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 22:17:27,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:27,135 INFO L225 Difference]: With dead ends: 87 [2018-11-07 22:17:27,135 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 22:17:27,136 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:17:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 22:17:27,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-11-07 22:17:27,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 22:17:27,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2018-11-07 22:17:27,144 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 59 [2018-11-07 22:17:27,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:27,144 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2018-11-07 22:17:27,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:17:27,145 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2018-11-07 22:17:27,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 22:17:27,146 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:27,147 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:27,147 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:27,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:27,147 INFO L82 PathProgramCache]: Analyzing trace with hash 369721150, now seen corresponding path program 11 times [2018-11-07 22:17:27,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:27,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:27,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:27,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:27,148 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:27,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:27,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:27,677 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:27,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:27,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:27,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:27,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:27,686 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:27,686 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:27,753 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 22:17:27,754 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:27,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:28,083 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 22:17:28,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:28,947 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 22:17:28,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:28,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 11] total 35 [2018-11-07 22:17:28,969 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:28,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:17:28,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:17:28,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=899, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:17:28,971 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand 26 states. [2018-11-07 22:17:30,389 WARN L179 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:17:37,126 WARN L179 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:17:44,223 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:17:46,352 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967289) 4294967296) 10000000) (<= 10000000 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< (mod (+ c_main_~x~0 4294967287) 4294967296) 10000000)) is different from false [2018-11-07 22:17:48,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:48,541 INFO L93 Difference]: Finished difference Result 105 states and 116 transitions. [2018-11-07 22:17:48,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:17:48,541 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 65 [2018-11-07 22:17:48,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:48,544 INFO L225 Difference]: With dead ends: 105 [2018-11-07 22:17:48,544 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 22:17:48,545 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=419, Invalid=1223, Unknown=2, NotChecked=78, Total=1722 [2018-11-07 22:17:48,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 22:17:48,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 76. [2018-11-07 22:17:48,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-07 22:17:48,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2018-11-07 22:17:48,554 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 65 [2018-11-07 22:17:48,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:48,554 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2018-11-07 22:17:48,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:17:48,554 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2018-11-07 22:17:48,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 22:17:48,556 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:48,556 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:48,556 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:48,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:48,556 INFO L82 PathProgramCache]: Analyzing trace with hash 10718589, now seen corresponding path program 12 times [2018-11-07 22:17:48,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:48,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:48,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:48,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:48,558 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:48,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:49,020 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:49,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:49,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:49,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:49,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:49,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:49,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:49,031 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:49,031 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:49,061 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:49,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:49,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:49,228 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 100 proven. 570 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:49,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:51,320 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 100 proven. 570 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:17:51,340 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:51,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 23] total 45 [2018-11-07 22:17:51,341 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:51,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:17:51,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:17:51,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:17:51,342 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 24 states. [2018-11-07 22:17:52,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:52,176 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2018-11-07 22:17:52,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:17:52,176 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 22:17:52,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:52,178 INFO L225 Difference]: With dead ends: 102 [2018-11-07 22:17:52,178 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:17:52,179 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:17:52,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:17:52,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 22:17:52,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 22:17:52,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2018-11-07 22:17:52,186 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2018-11-07 22:17:52,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:52,187 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2018-11-07 22:17:52,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:17:52,187 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2018-11-07 22:17:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 22:17:52,188 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:52,188 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:52,189 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:52,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:52,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1880758400, now seen corresponding path program 13 times [2018-11-07 22:17:52,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:52,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:52,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:52,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:52,190 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:52,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:52,886 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:52,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:52,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:52,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:52,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:52,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:52,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:52,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:52,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:53,041 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 252 proven. 459 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:17:53,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 252 proven. 459 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:17:55,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:55,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 21] total 44 [2018-11-07 22:17:55,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:55,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:17:55,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:17:55,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=1369, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:17:55,156 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand 25 states. [2018-11-07 22:17:55,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:55,795 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2018-11-07 22:17:55,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:17:55,795 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 22:17:55,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:55,796 INFO L225 Difference]: With dead ends: 105 [2018-11-07 22:17:55,797 INFO L226 Difference]: Without dead ends: 82 [2018-11-07 22:17:55,798 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=523, Invalid=1369, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:17:55,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-07 22:17:55,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-11-07 22:17:55,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-11-07 22:17:55,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2018-11-07 22:17:55,806 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2018-11-07 22:17:55,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:55,806 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2018-11-07 22:17:55,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:17:55,806 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2018-11-07 22:17:55,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 22:17:55,807 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:55,807 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:55,808 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:55,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:55,808 INFO L82 PathProgramCache]: Analyzing trace with hash -2078995811, now seen corresponding path program 14 times [2018-11-07 22:17:55,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:55,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:55,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:55,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:55,809 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:55,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:56,259 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:56,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:56,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:56,260 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:56,260 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:56,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:56,260 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:56,268 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:56,268 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:56,310 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:17:56,310 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:56,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:57,031 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 40 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2018-11-07 22:17:57,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:57,703 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 40 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2018-11-07 22:17:57,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:57,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 8, 11] total 41 [2018-11-07 22:17:57,724 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:57,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:17:57,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:17:57,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=1272, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:17:57,726 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 32 states. [2018-11-07 22:18:00,741 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:18:06,674 WARN L179 SmtUtils]: Spent 3.28 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:18:21,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:21,959 INFO L93 Difference]: Finished difference Result 117 states and 126 transitions. [2018-11-07 22:18:21,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:18:21,959 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 80 [2018-11-07 22:18:21,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:21,960 INFO L225 Difference]: With dead ends: 117 [2018-11-07 22:18:21,960 INFO L226 Difference]: Without dead ends: 94 [2018-11-07 22:18:21,961 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 149 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=530, Invalid=1628, Unknown=4, NotChecked=0, Total=2162 [2018-11-07 22:18:21,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-11-07 22:18:21,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2018-11-07 22:18:21,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 22:18:21,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-11-07 22:18:21,967 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 80 [2018-11-07 22:18:21,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:21,967 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-11-07 22:18:21,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:18:21,967 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-11-07 22:18:21,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 22:18:21,975 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:21,975 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:21,975 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:21,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:21,976 INFO L82 PathProgramCache]: Analyzing trace with hash 59221243, now seen corresponding path program 15 times [2018-11-07 22:18:21,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:21,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:21,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:21,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:21,977 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:21,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:23,175 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 50 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:23,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:23,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:23,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:23,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:23,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:23,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:18:23,185 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:23,185 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:23,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:23,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:23,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:23,256 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 340 proven. 570 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:18:23,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:25,506 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 340 proven. 570 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:18:25,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:25,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22, 23] total 49 [2018-11-07 22:18:25,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:25,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:18:25,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:18:25,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=667, Invalid=1685, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:18:25,531 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 28 states. [2018-11-07 22:18:26,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:26,270 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2018-11-07 22:18:26,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:18:26,271 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-11-07 22:18:26,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:26,272 INFO L225 Difference]: With dead ends: 118 [2018-11-07 22:18:26,272 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 22:18:26,274 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 150 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=667, Invalid=1685, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:18:26,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 22:18:26,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-11-07 22:18:26,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-11-07 22:18:26,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2018-11-07 22:18:26,281 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 86 [2018-11-07 22:18:26,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:26,281 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2018-11-07 22:18:26,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:18:26,281 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2018-11-07 22:18:26,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-11-07 22:18:26,282 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:26,282 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:26,283 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:26,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:26,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1341754853, now seen corresponding path program 16 times [2018-11-07 22:18:26,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:26,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:26,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:26,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:26,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:26,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:27,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 54 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:27,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:27,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:27,167 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:27,167 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:27,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:27,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:18:27,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:27,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:27,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:27,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 374 proven. 693 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:18:27,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:30,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 374 proven. 693 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:18:30,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:30,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 24, 25] total 53 [2018-11-07 22:18:30,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:30,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:18:30,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:18:30,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=775, Invalid=1981, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:18:30,078 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand 30 states. [2018-11-07 22:18:31,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:31,010 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2018-11-07 22:18:31,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:18:31,011 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-11-07 22:18:31,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:31,012 INFO L225 Difference]: With dead ends: 124 [2018-11-07 22:18:31,012 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:18:31,014 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 160 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=775, Invalid=1981, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:18:31,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:18:31,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-11-07 22:18:31,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:18:31,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2018-11-07 22:18:31,021 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 92 [2018-11-07 22:18:31,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:31,022 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2018-11-07 22:18:31,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:18:31,022 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2018-11-07 22:18:31,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-11-07 22:18:31,022 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:31,023 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:31,023 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:31,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:31,023 INFO L82 PathProgramCache]: Analyzing trace with hash -2143361221, now seen corresponding path program 17 times [2018-11-07 22:18:31,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:31,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:31,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:31,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:31,024 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:31,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:31,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 58 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:31,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:31,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:31,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:31,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:31,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:31,661 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:18:31,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:31,670 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:31,715 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 22:18:31,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:31,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:32,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 57 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-11-07 22:18:32,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:32,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 57 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-11-07 22:18:32,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:32,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 9, 12] total 49 [2018-11-07 22:18:32,567 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:32,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:18:32,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:18:32,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=1814, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:18:32,569 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand 39 states. [2018-11-07 22:18:40,879 WARN L179 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:18:49,769 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967289) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967283) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967293) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967287) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967285) 4294967296) 10000000)) is different from false [2018-11-07 22:18:51,973 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967289) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967293) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967287) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967285) 4294967296) 10000000)) is different from false [2018-11-07 22:18:57,638 WARN L179 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:19:05,180 WARN L179 SmtUtils]: Spent 579.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:19:27,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:27,090 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2018-11-07 22:19:27,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 22:19:27,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 98 [2018-11-07 22:19:27,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:27,091 INFO L225 Difference]: With dead ends: 137 [2018-11-07 22:19:27,091 INFO L226 Difference]: Without dead ends: 112 [2018-11-07 22:19:27,092 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 184 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 43.4s TimeCoverageRelationStatistics Valid=733, Invalid=2236, Unknown=9, NotChecked=214, Total=3192 [2018-11-07 22:19:27,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-11-07 22:19:27,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-11-07 22:19:27,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-11-07 22:19:27,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 111 transitions. [2018-11-07 22:19:27,099 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 111 transitions. Word has length 98 [2018-11-07 22:19:27,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:27,099 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 111 transitions. [2018-11-07 22:19:27,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:19:27,099 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 111 transitions. [2018-11-07 22:19:27,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-11-07 22:19:27,100 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:27,100 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:27,100 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:27,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:27,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1159676448, now seen corresponding path program 18 times [2018-11-07 22:19:27,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:27,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:27,101 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:27,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:27,102 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:27,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:27,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 155 proven. 1395 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:27,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:27,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:27,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:27,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:27,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:27,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:27,815 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:27,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:27,843 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:27,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:27,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:27,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 520 proven. 975 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:19:27,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:31,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 520 proven. 975 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:19:31,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:31,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 28, 29] total 61 [2018-11-07 22:19:31,276 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:31,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:19:31,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:19:31,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1015, Invalid=2645, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:19:31,277 INFO L87 Difference]: Start difference. First operand 108 states and 111 transitions. Second operand 34 states. [2018-11-07 22:19:32,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:32,427 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2018-11-07 22:19:32,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:19:32,430 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 107 [2018-11-07 22:19:32,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:32,432 INFO L225 Difference]: With dead ends: 142 [2018-11-07 22:19:32,432 INFO L226 Difference]: Without dead ends: 114 [2018-11-07 22:19:32,433 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1015, Invalid=2645, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:19:32,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-11-07 22:19:32,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-11-07 22:19:32,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-11-07 22:19:32,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 117 transitions. [2018-11-07 22:19:32,443 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 117 transitions. Word has length 107 [2018-11-07 22:19:32,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:32,443 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 117 transitions. [2018-11-07 22:19:32,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:19:32,443 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 117 transitions. [2018-11-07 22:19:32,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-11-07 22:19:32,444 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:32,444 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 27, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:32,445 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:32,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:32,445 INFO L82 PathProgramCache]: Analyzing trace with hash -628496128, now seen corresponding path program 19 times [2018-11-07 22:19:32,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:32,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:32,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:32,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:32,446 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:32,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:33,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 165 proven. 1584 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:33,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:33,218 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:33,218 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:33,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:33,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:33,218 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:33,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:33,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:19:33,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:33,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:33,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 560 proven. 1134 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:19:33,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:37,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 560 proven. 1134 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:19:37,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:37,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30, 31] total 65 [2018-11-07 22:19:37,563 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:37,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:19:37,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:19:37,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1147, Invalid=3013, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:19:37,567 INFO L87 Difference]: Start difference. First operand 114 states and 117 transitions. Second operand 36 states. [2018-11-07 22:19:39,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:39,005 INFO L93 Difference]: Finished difference Result 148 states and 156 transitions. [2018-11-07 22:19:39,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:19:39,005 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 113 [2018-11-07 22:19:39,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:39,007 INFO L225 Difference]: With dead ends: 148 [2018-11-07 22:19:39,007 INFO L226 Difference]: Without dead ends: 120 [2018-11-07 22:19:39,010 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 196 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1147, Invalid=3013, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:19:39,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-07 22:19:39,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2018-11-07 22:19:39,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 22:19:39,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2018-11-07 22:19:39,019 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 113 [2018-11-07 22:19:39,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:39,020 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2018-11-07 22:19:39,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:19:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2018-11-07 22:19:39,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 22:19:39,021 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:39,021 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 29, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:39,021 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:39,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:39,021 INFO L82 PathProgramCache]: Analyzing trace with hash -866916384, now seen corresponding path program 20 times [2018-11-07 22:19:39,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:39,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:39,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:39,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:39,022 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:39,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:40,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 175 proven. 1785 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:40,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:40,106 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:40,106 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:40,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:40,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:40,107 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:40,115 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:19:40,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:40,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:19:40,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:40,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:40,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 77 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-11-07 22:19:40,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:41,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 77 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-11-07 22:19:41,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:41,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 10, 13] total 57 [2018-11-07 22:19:41,437 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:41,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 22:19:41,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 22:19:41,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=2477, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:19:41,439 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 46 states. [2018-11-07 22:19:56,516 WARN L179 SmtUtils]: Spent 4.62 s on a formula simplification. DAG size of input: 36 DAG size of output: 16 [2018-11-07 22:20:14,899 WARN L179 SmtUtils]: Spent 2.31 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:20:26,098 WARN L179 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:20:28,156 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967289) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967283) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967281) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967287) 4294967296) 10000000) (< (mod (+ c_main_~x~0 4294967285) 4294967296) 10000000)) is different from false [2018-11-07 22:20:35,423 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:20:43,190 WARN L179 SmtUtils]: Spent 2.68 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:21:13,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:21:13,660 INFO L93 Difference]: Finished difference Result 162 states and 174 transitions. [2018-11-07 22:21:13,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:21:13,660 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 119 [2018-11-07 22:21:13,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:21:13,661 INFO L225 Difference]: With dead ends: 162 [2018-11-07 22:21:13,661 INFO L226 Difference]: Without dead ends: 134 [2018-11-07 22:21:13,663 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 225 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 82.6s TimeCoverageRelationStatistics Valid=1064, Invalid=3217, Unknown=13, NotChecked=128, Total=4422 [2018-11-07 22:21:13,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-11-07 22:21:13,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 129. [2018-11-07 22:21:13,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-07 22:21:13,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 133 transitions. [2018-11-07 22:21:13,672 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 133 transitions. Word has length 119 [2018-11-07 22:21:13,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:21:13,672 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 133 transitions. [2018-11-07 22:21:13,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 22:21:13,673 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 133 transitions. [2018-11-07 22:21:13,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-11-07 22:21:13,673 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:21:13,674 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 31, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:21:13,674 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:21:13,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:21:13,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1688030821, now seen corresponding path program 21 times [2018-11-07 22:21:13,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:21:13,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:13,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:21:13,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:13,675 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:21:13,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:15,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 296 proven. 1998 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:21:15,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:15,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:21:15,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:21:15,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:21:15,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:15,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:21:15,705 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:21:15,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:21:15,734 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:21:15,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:21:15,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:15,806 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 736 proven. 1488 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-07 22:21:15,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:20,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 736 proven. 1488 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-07 22:21:20,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:20,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 34, 35] total 73 [2018-11-07 22:21:20,029 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:20,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:21:20,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:21:20,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=3821, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:21:20,031 INFO L87 Difference]: Start difference. First operand 129 states and 133 transitions. Second operand 40 states. [2018-11-07 22:21:21,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:21:21,620 INFO L93 Difference]: Finished difference Result 166 states and 176 transitions. [2018-11-07 22:21:21,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:21:21,620 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 128 [2018-11-07 22:21:21,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:21:21,621 INFO L225 Difference]: With dead ends: 166 [2018-11-07 22:21:21,622 INFO L226 Difference]: Without dead ends: 135 [2018-11-07 22:21:21,623 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 222 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1435, Invalid=3821, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:21:21,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-07 22:21:21,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2018-11-07 22:21:21,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-11-07 22:21:21,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 139 transitions. [2018-11-07 22:21:21,633 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 139 transitions. Word has length 128 [2018-11-07 22:21:21,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:21:21,633 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 139 transitions. [2018-11-07 22:21:21,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:21:21,633 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 139 transitions. [2018-11-07 22:21:21,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-11-07 22:21:21,634 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:21:21,634 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 33, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:21:21,635 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:21:21,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:21:21,635 INFO L82 PathProgramCache]: Analyzing trace with hash -666954053, now seen corresponding path program 22 times [2018-11-07 22:21:21,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:21:21,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:21,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:21:21,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:21,636 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:21:21,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:22,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 312 proven. 2223 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:21:22,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:22,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:21:22,588 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:21:22,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:21:22,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:22,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:21:22,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:21:22,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:21:22,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:22,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:22,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 782 proven. 1683 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-07 22:21:22,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 782 proven. 1683 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-07 22:21:27,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:27,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 36, 37] total 77 [2018-11-07 22:21:27,309 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:27,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:21:27,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:21:27,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1591, Invalid=4261, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 22:21:27,310 INFO L87 Difference]: Start difference. First operand 135 states and 139 transitions. Second operand 42 states. [2018-11-07 22:21:29,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:21:29,116 INFO L93 Difference]: Finished difference Result 172 states and 182 transitions. [2018-11-07 22:21:29,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:21:29,117 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 134 [2018-11-07 22:21:29,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:21:29,118 INFO L225 Difference]: With dead ends: 172 [2018-11-07 22:21:29,118 INFO L226 Difference]: Without dead ends: 141 [2018-11-07 22:21:29,120 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 232 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1591, Invalid=4261, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 22:21:29,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-11-07 22:21:29,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2018-11-07 22:21:29,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 22:21:29,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 145 transitions. [2018-11-07 22:21:29,129 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 145 transitions. Word has length 134 [2018-11-07 22:21:29,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:21:29,129 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 145 transitions. [2018-11-07 22:21:29,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:21:29,129 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 145 transitions. [2018-11-07 22:21:29,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-11-07 22:21:29,130 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:21:29,130 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 35, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:21:29,130 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:21:29,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:21:29,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1917002715, now seen corresponding path program 23 times [2018-11-07 22:21:29,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:21:29,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:29,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:21:29,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:29,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:21:29,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 328 proven. 2460 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:21:30,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:30,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:21:30,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:21:30,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:21:30,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:30,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:21:30,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:21:30,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown