java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 10:10:06,011 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 10:10:06,013 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 10:10:06,028 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 10:10:06,029 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 10:10:06,030 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 10:10:06,031 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 10:10:06,033 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 10:10:06,035 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 10:10:06,035 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 10:10:06,036 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 10:10:06,037 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 10:10:06,037 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 10:10:06,038 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 10:10:06,040 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 10:10:06,040 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 10:10:06,041 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 10:10:06,043 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 10:10:06,045 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 10:10:06,047 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 10:10:06,048 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 10:10:06,049 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 10:10:06,052 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 10:10:06,052 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 10:10:06,052 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 10:10:06,053 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 10:10:06,054 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 10:10:06,055 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 10:10:06,056 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 10:10:06,057 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 10:10:06,057 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 10:10:06,058 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-23 10:10:06,058 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-23 10:10:06,059 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-23 10:10:06,060 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-23 10:10:06,060 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-23 10:10:06,061 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-23 10:10:06,090 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 10:10:06,090 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 10:10:06,092 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 10:10:06,092 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 10:10:06,093 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 10:10:06,093 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 10:10:06,093 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 10:10:06,094 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 10:10:06,094 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 10:10:06,094 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 10:10:06,094 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 10:10:06,094 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 10:10:06,095 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 10:10:06,095 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 10:10:06,095 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 10:10:06,097 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 10:10:06,097 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 10:10:06,097 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 10:10:06,098 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 10:10:06,098 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 10:10:06,098 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 10:10:06,098 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 10:10:06,098 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 10:10:06,099 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 10:10:06,100 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 10:10:06,100 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 10:10:06,101 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 10:10:06,101 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 10:10:06,101 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 10:10:06,101 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 10:10:06,102 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 10:10:06,102 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 10:10:06,102 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 10:10:06,102 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 10:10:06,178 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 10:10:06,192 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 10:10:06,197 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 10:10:06,198 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 10:10:06,199 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 10:10:06,200 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c [2018-10-23 10:10:06,261 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d978b2301/08f5b4f9863943348ad44b10a3f59fc0/FLAG632e89350 [2018-10-23 10:10:06,674 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 10:10:06,674 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c [2018-10-23 10:10:06,683 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d978b2301/08f5b4f9863943348ad44b10a3f59fc0/FLAG632e89350 [2018-10-23 10:10:06,698 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d978b2301/08f5b4f9863943348ad44b10a3f59fc0 [2018-10-23 10:10:06,709 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 10:10:06,711 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 10:10:06,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 10:10:06,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 10:10:06,715 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 10:10:06,716 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:10:06" (1/1) ... [2018-10-23 10:10:06,719 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20385d50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:06, skipping insertion in model container [2018-10-23 10:10:06,720 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:10:06" (1/1) ... [2018-10-23 10:10:06,731 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 10:10:06,759 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 10:10:06,964 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:10:06,969 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 10:10:06,986 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:10:07,002 INFO L193 MainTranslator]: Completed translation [2018-10-23 10:10:07,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07 WrapperNode [2018-10-23 10:10:07,003 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 10:10:07,004 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 10:10:07,004 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 10:10:07,004 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 10:10:07,015 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,021 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,028 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 10:10:07,028 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 10:10:07,028 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 10:10:07,029 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 10:10:07,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,051 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,053 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... [2018-10-23 10:10:07,054 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 10:10:07,055 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 10:10:07,055 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 10:10:07,055 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 10:10:07,056 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 10:10:07,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 10:10:07,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 10:10:07,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 10:10:07,136 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 10:10:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 10:10:07,136 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 10:10:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 10:10:07,136 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 10:10:07,461 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 10:10:07,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:10:07 BoogieIcfgContainer [2018-10-23 10:10:07,462 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 10:10:07,463 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 10:10:07,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 10:10:07,467 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 10:10:07,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:10:06" (1/3) ... [2018-10-23 10:10:07,468 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c03efb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:10:07, skipping insertion in model container [2018-10-23 10:10:07,468 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:10:07" (2/3) ... [2018-10-23 10:10:07,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c03efb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:10:07, skipping insertion in model container [2018-10-23 10:10:07,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:10:07" (3/3) ... [2018-10-23 10:10:07,471 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono1_true-unreach-call1.c [2018-10-23 10:10:07,481 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 10:10:07,488 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 10:10:07,502 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 10:10:07,533 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 10:10:07,533 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 10:10:07,533 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 10:10:07,534 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 10:10:07,534 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 10:10:07,534 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 10:10:07,534 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 10:10:07,534 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 10:10:07,552 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-23 10:10:07,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 10:10:07,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:07,560 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:07,562 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:07,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:07,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-23 10:10:07,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:07,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:07,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:07,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:07,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:07,676 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:10:07,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 10:10:07,676 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:10:07,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 10:10:07,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 10:10:07,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 10:10:07,698 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-23 10:10:07,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:07,721 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-23 10:10:07,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 10:10:07,724 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-23 10:10:07,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:07,734 INFO L225 Difference]: With dead ends: 30 [2018-10-23 10:10:07,734 INFO L226 Difference]: Without dead ends: 13 [2018-10-23 10:10:07,739 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 10:10:07,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-23 10:10:07,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-23 10:10:07,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-23 10:10:07,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-23 10:10:07,786 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-23 10:10:07,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:07,787 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-23 10:10:07,789 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 10:10:07,790 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-23 10:10:07,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-23 10:10:07,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:07,791 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:07,791 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:07,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:07,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-23 10:10:07,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:07,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:07,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:07,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:08,044 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-23 10:10:08,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:08,083 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:10:08,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 10:10:08,083 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:10:08,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 10:10:08,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 10:10:08,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 10:10:08,086 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-23 10:10:08,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:08,175 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-23 10:10:08,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 10:10:08,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-23 10:10:08,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:08,177 INFO L225 Difference]: With dead ends: 24 [2018-10-23 10:10:08,177 INFO L226 Difference]: Without dead ends: 16 [2018-10-23 10:10:08,178 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 10:10:08,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-23 10:10:08,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-23 10:10:08,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-23 10:10:08,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-23 10:10:08,193 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-23 10:10:08,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:08,194 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-23 10:10:08,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 10:10:08,194 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-23 10:10:08,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-23 10:10:08,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:08,195 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:08,195 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:08,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:08,196 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-23 10:10:08,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:08,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:08,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:08,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:08,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:08,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:08,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:08,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:08,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:08,318 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-23 10:10:08,320 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-23 10:10:08,365 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 10:10:08,366 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 10:10:08,497 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 10:10:08,707 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 10:10:08,708 INFO L272 AbstractInterpreter]: Visited 13 different actions 93 times. Merged at 4 different actions 42 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-23 10:10:08,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:08,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 10:10:08,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:08,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:08,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:08,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:08,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:08,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:08,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:08,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:09,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:09,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:09,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 9 [2018-10-23 10:10:09,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:09,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 10:10:09,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 10:10:09,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:10:09,159 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-23 10:10:09,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:09,319 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-23 10:10:09,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 10:10:09,321 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-23 10:10:09,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:09,322 INFO L225 Difference]: With dead ends: 27 [2018-10-23 10:10:09,322 INFO L226 Difference]: Without dead ends: 19 [2018-10-23 10:10:09,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:10:09,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-23 10:10:09,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-23 10:10:09,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-23 10:10:09,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-23 10:10:09,331 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-23 10:10:09,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:09,332 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-23 10:10:09,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 10:10:09,332 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-23 10:10:09,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 10:10:09,333 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:09,333 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:09,333 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:09,335 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:09,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-23 10:10:09,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:09,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:09,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:09,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:09,337 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:09,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:09,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:09,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:09,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:09,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:09,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:09,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:09,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:09,497 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:09,497 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:09,532 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:09,532 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:09,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:09,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:09,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:09,908 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:09,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:09,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 11 [2018-10-23 10:10:09,935 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:09,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 10:10:09,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 10:10:09,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-10-23 10:10:09,937 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-23 10:10:10,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:10,015 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-23 10:10:10,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 10:10:10,017 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-23 10:10:10,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:10,018 INFO L225 Difference]: With dead ends: 30 [2018-10-23 10:10:10,018 INFO L226 Difference]: Without dead ends: 22 [2018-10-23 10:10:10,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-10-23 10:10:10,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-23 10:10:10,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-23 10:10:10,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-23 10:10:10,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-23 10:10:10,024 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2018-10-23 10:10:10,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:10,024 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-23 10:10:10,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 10:10:10,025 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-23 10:10:10,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-23 10:10:10,026 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:10,026 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:10,026 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:10,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:10,027 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-23 10:10:10,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:10,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:10,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:10,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:10,028 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:10,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:10,135 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:10,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:10,136 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:10,136 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:10,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:10,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:10,158 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:10,158 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:10,170 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:10,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:10,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:10,194 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:10,769 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:10,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 13 [2018-10-23 10:10:10,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:10,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 10:10:10,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 10:10:10,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-23 10:10:10,792 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 6 states. [2018-10-23 10:10:10,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:10,862 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-23 10:10:10,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 10:10:10,863 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-23 10:10:10,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:10,865 INFO L225 Difference]: With dead ends: 33 [2018-10-23 10:10:10,865 INFO L226 Difference]: Without dead ends: 25 [2018-10-23 10:10:10,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-23 10:10:10,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-23 10:10:10,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-23 10:10:10,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-23 10:10:10,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-23 10:10:10,873 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2018-10-23 10:10:10,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:10,873 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-23 10:10:10,873 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 10:10:10,873 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-23 10:10:10,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 10:10:10,874 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:10,874 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:10,875 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:10,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:10,875 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-23 10:10:10,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:10,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:10,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:10,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:10,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:10,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:11,105 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:11,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:11,106 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:11,106 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:11,106 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:11,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:11,106 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:11,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:11,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:11,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:11,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:11,144 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:11,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:11,423 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:11,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:11,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 10] total 15 [2018-10-23 10:10:11,445 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:11,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 10:10:11,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 10:10:11,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-23 10:10:11,446 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2018-10-23 10:10:11,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:11,570 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2018-10-23 10:10:11,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 10:10:11,571 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-23 10:10:11,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:11,572 INFO L225 Difference]: With dead ends: 36 [2018-10-23 10:10:11,572 INFO L226 Difference]: Without dead ends: 28 [2018-10-23 10:10:11,572 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-23 10:10:11,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-23 10:10:11,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-23 10:10:11,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-23 10:10:11,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-23 10:10:11,578 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2018-10-23 10:10:11,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:11,578 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-23 10:10:11,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 10:10:11,583 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-23 10:10:11,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-23 10:10:11,584 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:11,584 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:11,584 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:11,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:11,586 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-23 10:10:11,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:11,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:11,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:11,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:11,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:11,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:11,863 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:11,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:11,864 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:11,864 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:11,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:11,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:11,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:11,872 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:11,872 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:11,903 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:11,904 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:11,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:11,919 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:11,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:12,228 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:12,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:12,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 17 [2018-10-23 10:10:12,258 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:12,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 10:10:12,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 10:10:12,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2018-10-23 10:10:12,259 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 8 states. [2018-10-23 10:10:12,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:12,378 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-10-23 10:10:12,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 10:10:12,378 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-23 10:10:12,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:12,379 INFO L225 Difference]: With dead ends: 39 [2018-10-23 10:10:12,379 INFO L226 Difference]: Without dead ends: 31 [2018-10-23 10:10:12,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2018-10-23 10:10:12,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-23 10:10:12,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-23 10:10:12,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-23 10:10:12,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-23 10:10:12,386 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2018-10-23 10:10:12,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:12,387 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-23 10:10:12,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 10:10:12,387 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-23 10:10:12,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-23 10:10:12,388 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:12,388 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:12,388 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:12,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:12,388 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-23 10:10:12,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:12,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:12,390 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:12,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:12,390 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:12,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:12,601 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:12,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:12,601 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:12,601 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:12,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:12,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:12,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:12,610 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:12,611 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:12,623 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:12,624 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:12,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:12,639 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:12,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:13,061 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:13,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:13,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 12] total 19 [2018-10-23 10:10:13,084 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:13,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 10:10:13,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 10:10:13,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2018-10-23 10:10:13,085 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 9 states. [2018-10-23 10:10:13,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:13,197 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-10-23 10:10:13,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 10:10:13,200 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-23 10:10:13,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:13,201 INFO L225 Difference]: With dead ends: 42 [2018-10-23 10:10:13,201 INFO L226 Difference]: Without dead ends: 34 [2018-10-23 10:10:13,202 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2018-10-23 10:10:13,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-23 10:10:13,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-23 10:10:13,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-23 10:10:13,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-10-23 10:10:13,207 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2018-10-23 10:10:13,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:13,207 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-10-23 10:10:13,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 10:10:13,208 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-10-23 10:10:13,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-23 10:10:13,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:13,209 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:13,209 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:13,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:13,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-23 10:10:13,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:13,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:13,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:13,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:13,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:13,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:13,411 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:13,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:13,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:13,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:13,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:13,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:13,413 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:13,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:13,425 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:13,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:13,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:13,468 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:13,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:13,864 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:13,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:13,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 21 [2018-10-23 10:10:13,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:13,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 10:10:13,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 10:10:13,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2018-10-23 10:10:13,886 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 10 states. [2018-10-23 10:10:14,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:14,034 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-10-23 10:10:14,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 10:10:14,037 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-23 10:10:14,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:14,039 INFO L225 Difference]: With dead ends: 45 [2018-10-23 10:10:14,039 INFO L226 Difference]: Without dead ends: 37 [2018-10-23 10:10:14,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2018-10-23 10:10:14,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-23 10:10:14,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-23 10:10:14,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-23 10:10:14,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-23 10:10:14,045 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2018-10-23 10:10:14,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:14,045 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-23 10:10:14,045 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 10:10:14,045 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-23 10:10:14,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-23 10:10:14,046 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:14,047 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:14,047 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:14,047 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:14,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-23 10:10:14,047 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:14,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:14,048 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:14,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:14,049 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:14,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:14,228 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:14,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:14,229 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:14,229 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:14,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:14,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:14,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:14,240 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:14,240 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:14,252 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:14,252 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:14,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:14,271 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:14,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:15,104 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:15,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:15,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 14] total 23 [2018-10-23 10:10:15,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:15,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 10:10:15,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 10:10:15,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2018-10-23 10:10:15,127 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 11 states. [2018-10-23 10:10:15,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:15,412 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2018-10-23 10:10:15,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 10:10:15,413 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-23 10:10:15,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:15,414 INFO L225 Difference]: With dead ends: 48 [2018-10-23 10:10:15,414 INFO L226 Difference]: Without dead ends: 40 [2018-10-23 10:10:15,416 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2018-10-23 10:10:15,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-23 10:10:15,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-23 10:10:15,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-23 10:10:15,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-23 10:10:15,421 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2018-10-23 10:10:15,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:15,421 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-23 10:10:15,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 10:10:15,422 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-23 10:10:15,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-23 10:10:15,423 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:15,423 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:15,423 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:15,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:15,423 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-23 10:10:15,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:15,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:15,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:15,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:15,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:15,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:15,641 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:15,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:15,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:15,642 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:15,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:15,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:15,642 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:15,649 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:15,650 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:15,673 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:15,673 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:15,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:15,693 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:15,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:16,322 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:16,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:16,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15] total 25 [2018-10-23 10:10:16,349 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:16,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 10:10:16,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 10:10:16,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2018-10-23 10:10:16,351 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 12 states. [2018-10-23 10:10:16,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:16,573 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2018-10-23 10:10:16,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 10:10:16,574 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-23 10:10:16,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:16,575 INFO L225 Difference]: With dead ends: 51 [2018-10-23 10:10:16,576 INFO L226 Difference]: Without dead ends: 43 [2018-10-23 10:10:16,577 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2018-10-23 10:10:16,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-23 10:10:16,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-23 10:10:16,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-23 10:10:16,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-23 10:10:16,582 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2018-10-23 10:10:16,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:16,583 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-23 10:10:16,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 10:10:16,583 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-23 10:10:16,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-23 10:10:16,584 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:16,584 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:16,584 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:16,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:16,585 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-23 10:10:16,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:16,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:16,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:16,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:16,601 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:16,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:16,873 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:16,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:16,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:16,874 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:16,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:16,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:16,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:16,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:16,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:16,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:16,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:16,968 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:16,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:17,564 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:17,585 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:17,585 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 16] total 27 [2018-10-23 10:10:17,585 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:17,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 10:10:17,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 10:10:17,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2018-10-23 10:10:17,587 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 13 states. [2018-10-23 10:10:17,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:17,978 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2018-10-23 10:10:17,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 10:10:17,979 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-23 10:10:17,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:17,980 INFO L225 Difference]: With dead ends: 54 [2018-10-23 10:10:17,981 INFO L226 Difference]: Without dead ends: 46 [2018-10-23 10:10:17,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2018-10-23 10:10:17,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-23 10:10:17,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-23 10:10:17,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-23 10:10:17,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-23 10:10:17,987 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2018-10-23 10:10:17,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:17,988 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-23 10:10:17,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 10:10:17,988 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-23 10:10:17,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-23 10:10:17,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:17,989 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:17,989 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:17,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:17,989 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-23 10:10:17,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:17,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:17,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:17,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:17,991 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:17,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:18,285 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:18,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:18,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:18,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:18,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:18,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:18,286 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:18,294 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:18,295 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:18,306 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:18,306 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:18,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:18,334 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:18,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:19,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:19,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 17] total 29 [2018-10-23 10:10:19,007 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:19,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 10:10:19,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 10:10:19,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=612, Unknown=0, NotChecked=0, Total=812 [2018-10-23 10:10:19,008 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 14 states. [2018-10-23 10:10:19,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:19,301 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2018-10-23 10:10:19,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 10:10:19,301 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-23 10:10:19,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:19,303 INFO L225 Difference]: With dead ends: 57 [2018-10-23 10:10:19,303 INFO L226 Difference]: Without dead ends: 49 [2018-10-23 10:10:19,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=200, Invalid=612, Unknown=0, NotChecked=0, Total=812 [2018-10-23 10:10:19,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-23 10:10:19,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-23 10:10:19,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-23 10:10:19,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-23 10:10:19,310 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-23 10:10:19,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:19,310 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-23 10:10:19,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 10:10:19,310 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-23 10:10:19,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-23 10:10:19,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:19,311 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:19,311 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:19,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:19,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-23 10:10:19,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:19,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:19,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:19,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:19,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:19,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:19,686 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:19,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:19,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:19,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:19,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:19,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:19,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:19,694 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:19,695 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:19,708 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:19,709 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:19,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:19,738 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:19,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:20,986 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:21,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:21,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 18] total 31 [2018-10-23 10:10:21,007 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:21,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 10:10:21,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 10:10:21,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=701, Unknown=0, NotChecked=0, Total=930 [2018-10-23 10:10:21,008 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 15 states. [2018-10-23 10:10:21,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:21,286 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-23 10:10:21,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 10:10:21,287 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-23 10:10:21,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:21,288 INFO L225 Difference]: With dead ends: 60 [2018-10-23 10:10:21,288 INFO L226 Difference]: Without dead ends: 52 [2018-10-23 10:10:21,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=229, Invalid=701, Unknown=0, NotChecked=0, Total=930 [2018-10-23 10:10:21,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-23 10:10:21,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-23 10:10:21,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-23 10:10:21,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-10-23 10:10:21,295 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2018-10-23 10:10:21,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:21,295 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-10-23 10:10:21,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 10:10:21,295 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-10-23 10:10:21,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-23 10:10:21,296 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:21,296 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:21,297 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:21,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:21,297 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-23 10:10:21,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:21,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:21,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:21,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:21,298 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:21,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:21,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:21,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:21,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:21,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:21,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:21,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:21,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:21,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:21,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:21,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:21,822 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:21,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:22,661 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:22,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:22,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 19] total 33 [2018-10-23 10:10:22,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:22,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 10:10:22,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 10:10:22,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=796, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 10:10:22,685 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 16 states. [2018-10-23 10:10:23,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:23,079 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2018-10-23 10:10:23,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 10:10:23,079 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-23 10:10:23,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:23,080 INFO L225 Difference]: With dead ends: 63 [2018-10-23 10:10:23,081 INFO L226 Difference]: Without dead ends: 55 [2018-10-23 10:10:23,082 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=260, Invalid=796, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 10:10:23,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-23 10:10:23,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-10-23 10:10:23,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-23 10:10:23,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-10-23 10:10:23,088 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2018-10-23 10:10:23,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:23,088 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-10-23 10:10:23,088 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 10:10:23,088 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-10-23 10:10:23,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-23 10:10:23,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:23,090 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:23,090 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:23,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:23,090 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-23 10:10:23,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:23,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:23,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:23,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:23,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:23,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:23,339 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:23,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:23,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:23,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:23,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:23,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:23,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:23,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:23,348 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:23,363 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:23,363 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:23,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:23,394 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:23,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:24,428 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:24,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:24,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 35 [2018-10-23 10:10:24,450 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:24,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 10:10:24,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 10:10:24,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=897, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 10:10:24,451 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 17 states. [2018-10-23 10:10:24,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:24,869 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2018-10-23 10:10:24,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 10:10:24,870 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-23 10:10:24,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:24,871 INFO L225 Difference]: With dead ends: 66 [2018-10-23 10:10:24,871 INFO L226 Difference]: Without dead ends: 58 [2018-10-23 10:10:24,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=293, Invalid=897, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 10:10:24,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-23 10:10:24,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-23 10:10:24,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-23 10:10:24,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-23 10:10:24,879 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 53 [2018-10-23 10:10:24,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:24,879 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-23 10:10:24,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 10:10:24,879 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-23 10:10:24,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-23 10:10:24,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:24,880 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:24,881 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:24,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:24,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-23 10:10:24,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:24,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:24,882 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:24,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:24,882 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:24,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:25,383 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:25,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:25,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:25,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:25,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:25,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:25,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:25,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:25,392 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:25,405 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:25,406 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:25,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:25,429 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:25,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:26,449 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:26,469 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:26,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 21] total 37 [2018-10-23 10:10:26,470 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:26,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 10:10:26,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 10:10:26,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=1004, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 10:10:26,471 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 18 states. [2018-10-23 10:10:27,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:27,188 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2018-10-23 10:10:27,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 10:10:27,189 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-23 10:10:27,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:27,190 INFO L225 Difference]: With dead ends: 69 [2018-10-23 10:10:27,190 INFO L226 Difference]: Without dead ends: 61 [2018-10-23 10:10:27,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 92 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=328, Invalid=1004, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 10:10:27,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-23 10:10:27,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-23 10:10:27,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-23 10:10:27,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-23 10:10:27,196 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 56 [2018-10-23 10:10:27,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:27,196 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-23 10:10:27,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 10:10:27,196 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-23 10:10:27,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-23 10:10:27,197 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:27,198 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:27,198 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:27,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:27,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-23 10:10:27,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:27,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:27,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:27,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:27,199 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:27,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:27,531 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:27,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:27,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:27,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:27,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:27,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:27,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:27,539 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:27,539 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:27,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:27,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:27,583 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:27,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:29,354 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:29,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:29,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 22] total 39 [2018-10-23 10:10:29,375 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:29,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 10:10:29,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 10:10:29,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1117, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 10:10:29,377 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 19 states. [2018-10-23 10:10:29,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:29,810 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2018-10-23 10:10:29,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 10:10:29,811 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-23 10:10:29,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:29,811 INFO L225 Difference]: With dead ends: 72 [2018-10-23 10:10:29,811 INFO L226 Difference]: Without dead ends: 64 [2018-10-23 10:10:29,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=365, Invalid=1117, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 10:10:29,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-23 10:10:29,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-10-23 10:10:29,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-23 10:10:29,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-23 10:10:29,818 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2018-10-23 10:10:29,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:29,818 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-23 10:10:29,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 10:10:29,818 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-23 10:10:29,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-23 10:10:29,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:29,819 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:29,819 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:29,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:29,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-23 10:10:29,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:29,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:29,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:29,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:29,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:30,546 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:30,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:30,547 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:30,547 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:30,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:30,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:30,547 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:30,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:30,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:30,569 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:30,569 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:30,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:30,591 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:30,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:32,309 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:32,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:32,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 23] total 41 [2018-10-23 10:10:32,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:32,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 10:10:32,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 10:10:32,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 10:10:32,332 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 20 states. [2018-10-23 10:10:33,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:33,014 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-10-23 10:10:33,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 10:10:33,015 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-23 10:10:33,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:33,016 INFO L225 Difference]: With dead ends: 75 [2018-10-23 10:10:33,016 INFO L226 Difference]: Without dead ends: 67 [2018-10-23 10:10:33,017 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 10:10:33,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-23 10:10:33,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-23 10:10:33,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-23 10:10:33,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-23 10:10:33,023 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2018-10-23 10:10:33,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:33,024 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-23 10:10:33,024 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 10:10:33,024 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-23 10:10:33,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-23 10:10:33,025 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:33,025 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:33,025 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:33,025 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:33,025 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-23 10:10:33,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:33,026 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:33,026 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:33,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:33,027 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:33,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:33,539 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:33,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:33,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:33,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:33,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:33,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:33,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:33,556 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:33,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:33,589 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:33,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:33,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:33,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:35,781 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:35,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:35,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 24] total 43 [2018-10-23 10:10:35,801 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:35,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 10:10:35,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 10:10:35,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1361, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 10:10:35,802 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 21 states. [2018-10-23 10:10:36,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:36,318 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2018-10-23 10:10:36,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 10:10:36,319 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-23 10:10:36,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:36,320 INFO L225 Difference]: With dead ends: 78 [2018-10-23 10:10:36,320 INFO L226 Difference]: Without dead ends: 70 [2018-10-23 10:10:36,322 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=445, Invalid=1361, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 10:10:36,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-23 10:10:36,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-23 10:10:36,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-23 10:10:36,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-10-23 10:10:36,327 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 65 [2018-10-23 10:10:36,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:36,327 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-10-23 10:10:36,327 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 10:10:36,327 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-10-23 10:10:36,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-23 10:10:36,328 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:36,328 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:36,328 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:36,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:36,329 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-23 10:10:36,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:36,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:36,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:36,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:36,330 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:36,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:36,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:36,654 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:36,654 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:36,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:36,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:36,654 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:36,662 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:36,662 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:36,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:36,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:36,698 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:36,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:38,795 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:38,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:38,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 25] total 45 [2018-10-23 10:10:38,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:38,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 10:10:38,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 10:10:38,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=488, Invalid=1492, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 10:10:38,835 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 22 states. [2018-10-23 10:10:39,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:39,674 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2018-10-23 10:10:39,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 10:10:39,674 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-23 10:10:39,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:39,675 INFO L225 Difference]: With dead ends: 81 [2018-10-23 10:10:39,675 INFO L226 Difference]: Without dead ends: 73 [2018-10-23 10:10:39,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=488, Invalid=1492, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 10:10:39,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-23 10:10:39,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-10-23 10:10:39,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-10-23 10:10:39,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-10-23 10:10:39,681 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2018-10-23 10:10:39,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:39,682 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-10-23 10:10:39,682 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 10:10:39,682 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-10-23 10:10:39,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-23 10:10:39,683 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:39,683 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:39,683 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:39,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:39,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-23 10:10:39,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:39,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:39,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:39,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:39,685 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:39,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:40,248 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:40,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:40,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:40,248 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:40,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:40,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:40,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:40,256 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:40,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:40,275 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:40,275 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:40,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:40,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:42,285 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:42,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:42,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 26] total 47 [2018-10-23 10:10:42,306 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:42,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 10:10:42,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 10:10:42,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=1629, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 10:10:42,308 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 23 states. [2018-10-23 10:10:42,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:42,953 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2018-10-23 10:10:42,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 10:10:42,954 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-23 10:10:42,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:42,955 INFO L225 Difference]: With dead ends: 84 [2018-10-23 10:10:42,956 INFO L226 Difference]: Without dead ends: 76 [2018-10-23 10:10:42,957 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 117 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=533, Invalid=1629, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 10:10:42,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-23 10:10:42,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-10-23 10:10:42,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-23 10:10:42,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-23 10:10:42,961 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 71 [2018-10-23 10:10:42,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:42,961 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-23 10:10:42,962 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 10:10:42,962 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-23 10:10:42,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-23 10:10:42,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:42,963 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:42,963 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:42,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:42,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1925556347, now seen corresponding path program 21 times [2018-10-23 10:10:42,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:42,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:42,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:42,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:42,964 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:42,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:43,417 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:43,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:43,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:43,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:43,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:43,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:43,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:43,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:43,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:43,475 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:43,475 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:43,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:43,560 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:43,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:45,961 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:45,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:45,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 27] total 49 [2018-10-23 10:10:45,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:45,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-23 10:10:45,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-23 10:10:45,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1772, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 10:10:45,984 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 24 states. [2018-10-23 10:10:46,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:46,654 INFO L93 Difference]: Finished difference Result 87 states and 91 transitions. [2018-10-23 10:10:46,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 10:10:46,655 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-23 10:10:46,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:46,656 INFO L225 Difference]: With dead ends: 87 [2018-10-23 10:10:46,656 INFO L226 Difference]: Without dead ends: 79 [2018-10-23 10:10:46,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 122 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=580, Invalid=1772, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 10:10:46,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-23 10:10:46,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-23 10:10:46,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-23 10:10:46,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-23 10:10:46,661 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-23 10:10:46,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:46,661 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-23 10:10:46,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-23 10:10:46,661 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-23 10:10:46,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-23 10:10:46,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:46,662 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:46,662 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:46,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:46,663 INFO L82 PathProgramCache]: Analyzing trace with hash -499371138, now seen corresponding path program 22 times [2018-10-23 10:10:46,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:46,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:46,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:46,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:46,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:46,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:48,893 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:48,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:48,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:48,893 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:48,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:48,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:48,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:48,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:48,902 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:48,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:48,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:48,941 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:48,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:51,024 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:51,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:51,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 28] total 51 [2018-10-23 10:10:51,046 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:51,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 10:10:51,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 10:10:51,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=1921, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 10:10:51,047 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 25 states. [2018-10-23 10:10:51,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:51,810 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2018-10-23 10:10:51,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-23 10:10:51,811 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-23 10:10:51,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:51,812 INFO L225 Difference]: With dead ends: 90 [2018-10-23 10:10:51,812 INFO L226 Difference]: Without dead ends: 82 [2018-10-23 10:10:51,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 127 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=629, Invalid=1921, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 10:10:51,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-23 10:10:51,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-10-23 10:10:51,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-23 10:10:51,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-23 10:10:51,817 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2018-10-23 10:10:51,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:51,817 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-23 10:10:51,817 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 10:10:51,818 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-23 10:10:51,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-23 10:10:51,818 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:51,818 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:51,819 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:51,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:51,819 INFO L82 PathProgramCache]: Analyzing trace with hash -164158053, now seen corresponding path program 23 times [2018-10-23 10:10:51,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:51,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:51,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:51,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:51,820 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:51,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:52,915 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:52,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:52,915 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:52,915 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:52,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:52,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:52,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:52,924 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:52,924 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:52,945 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:52,945 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:52,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:52,982 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:52,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:55,153 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:55,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:55,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 29] total 53 [2018-10-23 10:10:55,173 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:55,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-23 10:10:55,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-23 10:10:55,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=680, Invalid=2076, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 10:10:55,175 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 26 states. [2018-10-23 10:10:56,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:56,132 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2018-10-23 10:10:56,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-23 10:10:56,132 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-10-23 10:10:56,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:56,133 INFO L225 Difference]: With dead ends: 93 [2018-10-23 10:10:56,133 INFO L226 Difference]: Without dead ends: 85 [2018-10-23 10:10:56,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=680, Invalid=2076, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 10:10:56,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-23 10:10:56,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-10-23 10:10:56,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-10-23 10:10:56,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-10-23 10:10:56,139 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 80 [2018-10-23 10:10:56,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:56,140 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-10-23 10:10:56,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-23 10:10:56,140 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-10-23 10:10:56,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-23 10:10:56,141 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:56,142 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:56,142 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:56,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:56,142 INFO L82 PathProgramCache]: Analyzing trace with hash 369893982, now seen corresponding path program 24 times [2018-10-23 10:10:56,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:56,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:56,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:56,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:56,143 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:56,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:56,943 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:56,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:56,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:56,944 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:56,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:56,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:56,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:56,957 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:56,957 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:56,981 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:56,981 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:56,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:57,010 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:57,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:59,457 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:59,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:59,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 30] total 55 [2018-10-23 10:10:59,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:59,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-23 10:10:59,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-23 10:10:59,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=733, Invalid=2237, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:10:59,480 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 27 states. [2018-10-23 10:11:00,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:00,298 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2018-10-23 10:11:00,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-23 10:11:00,303 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-23 10:11:00,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:00,304 INFO L225 Difference]: With dead ends: 96 [2018-10-23 10:11:00,304 INFO L226 Difference]: Without dead ends: 88 [2018-10-23 10:11:00,305 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=733, Invalid=2237, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:11:00,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-23 10:11:00,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-23 10:11:00,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-23 10:11:00,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-10-23 10:11:00,308 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 83 [2018-10-23 10:11:00,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:00,308 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-10-23 10:11:00,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-23 10:11:00,309 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-10-23 10:11:00,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-23 10:11:00,309 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:00,310 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:00,310 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:00,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:00,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1755204283, now seen corresponding path program 25 times [2018-10-23 10:11:00,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:00,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:00,311 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:00,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:00,311 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:00,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:01,307 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:01,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:01,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:01,308 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:01,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:01,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:01,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:01,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:01,315 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:01,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:01,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:01,391 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:01,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:04,200 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:04,220 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:04,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 31] total 57 [2018-10-23 10:11:04,220 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:04,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-23 10:11:04,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-23 10:11:04,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=788, Invalid=2404, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 10:11:04,222 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 28 states. [2018-10-23 10:11:05,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:05,115 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2018-10-23 10:11:05,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-23 10:11:05,115 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-10-23 10:11:05,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:05,117 INFO L225 Difference]: With dead ends: 99 [2018-10-23 10:11:05,117 INFO L226 Difference]: Without dead ends: 91 [2018-10-23 10:11:05,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=788, Invalid=2404, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 10:11:05,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-23 10:11:05,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-10-23 10:11:05,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-10-23 10:11:05,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-10-23 10:11:05,123 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2018-10-23 10:11:05,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:05,123 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-10-23 10:11:05,123 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-23 10:11:05,123 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-10-23 10:11:05,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-23 10:11:05,124 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:05,124 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:05,124 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:05,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:05,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1193634110, now seen corresponding path program 26 times [2018-10-23 10:11:05,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:05,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:05,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:05,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:05,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:05,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:06,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:06,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:06,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:06,351 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:06,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:06,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:06,352 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:06,360 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:06,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:06,385 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:06,385 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:06,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:06,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:06,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:09,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:09,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:09,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 32] total 59 [2018-10-23 10:11:09,191 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:09,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-23 10:11:09,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-23 10:11:09,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=845, Invalid=2577, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 10:11:09,192 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 29 states. [2018-10-23 10:11:10,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:10,178 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2018-10-23 10:11:10,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-23 10:11:10,179 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-10-23 10:11:10,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:10,180 INFO L225 Difference]: With dead ends: 102 [2018-10-23 10:11:10,180 INFO L226 Difference]: Without dead ends: 94 [2018-10-23 10:11:10,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 147 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=845, Invalid=2577, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 10:11:10,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-23 10:11:10,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-10-23 10:11:10,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-23 10:11:10,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-23 10:11:10,186 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 89 [2018-10-23 10:11:10,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:10,186 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-23 10:11:10,186 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-23 10:11:10,186 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-23 10:11:10,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-23 10:11:10,187 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:10,187 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:10,187 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:10,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:10,187 INFO L82 PathProgramCache]: Analyzing trace with hash 354228187, now seen corresponding path program 27 times [2018-10-23 10:11:10,187 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:10,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:10,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:10,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:10,188 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:10,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:11,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:11,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:11,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:11,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:11,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:11,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:11,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:11,393 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:11,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:11,417 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:11,417 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:11,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:11,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:11,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:14,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:15,007 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:15,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 33] total 61 [2018-10-23 10:11:15,007 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:15,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-23 10:11:15,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-23 10:11:15,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=904, Invalid=2756, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 10:11:15,008 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 30 states. [2018-10-23 10:11:16,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:16,058 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-10-23 10:11:16,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-23 10:11:16,058 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-10-23 10:11:16,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:16,060 INFO L225 Difference]: With dead ends: 105 [2018-10-23 10:11:16,060 INFO L226 Difference]: Without dead ends: 97 [2018-10-23 10:11:16,061 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 152 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=904, Invalid=2756, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 10:11:16,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-23 10:11:16,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-23 10:11:16,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-23 10:11:16,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-23 10:11:16,065 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 92 [2018-10-23 10:11:16,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:16,066 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-23 10:11:16,066 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-23 10:11:16,066 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-23 10:11:16,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-23 10:11:16,067 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:16,067 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:16,067 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:16,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:16,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1088026594, now seen corresponding path program 28 times [2018-10-23 10:11:16,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:16,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:16,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:16,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:16,068 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:16,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:16,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:16,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:16,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:16,768 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:16,768 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:16,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:16,769 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:16,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:16,775 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:16,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:16,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:16,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:16,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:20,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:20,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:20,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 34] total 63 [2018-10-23 10:11:20,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:20,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-23 10:11:20,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-23 10:11:20,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=965, Invalid=2941, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 10:11:20,606 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 31 states. [2018-10-23 10:11:21,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:21,880 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2018-10-23 10:11:21,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-23 10:11:21,881 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-10-23 10:11:21,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:21,882 INFO L225 Difference]: With dead ends: 108 [2018-10-23 10:11:21,882 INFO L226 Difference]: Without dead ends: 100 [2018-10-23 10:11:21,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 157 SyntacticMatches, 3 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=965, Invalid=2941, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 10:11:21,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-23 10:11:21,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-10-23 10:11:21,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-23 10:11:21,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-23 10:11:21,887 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 95 [2018-10-23 10:11:21,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:21,888 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-23 10:11:21,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-23 10:11:21,888 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-23 10:11:21,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-23 10:11:21,888 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:21,889 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:21,889 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:21,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:21,889 INFO L82 PathProgramCache]: Analyzing trace with hash -447378181, now seen corresponding path program 29 times [2018-10-23 10:11:21,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:21,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:21,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:21,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:21,890 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:21,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:22,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:22,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:22,515 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:22,515 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:22,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:22,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:22,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:22,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:22,523 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:22,547 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:22,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:22,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:22,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:22,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:26,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:26,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:26,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 35] total 65 [2018-10-23 10:11:26,316 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:26,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-23 10:11:26,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-23 10:11:26,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1028, Invalid=3132, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 10:11:26,318 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 32 states. [2018-10-23 10:11:27,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:27,679 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2018-10-23 10:11:27,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-23 10:11:27,680 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-10-23 10:11:27,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:27,681 INFO L225 Difference]: With dead ends: 111 [2018-10-23 10:11:27,681 INFO L226 Difference]: Without dead ends: 103 [2018-10-23 10:11:27,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1028, Invalid=3132, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 10:11:27,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-23 10:11:27,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-10-23 10:11:27,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-10-23 10:11:27,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-10-23 10:11:27,687 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 98 [2018-10-23 10:11:27,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:27,688 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-10-23 10:11:27,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-23 10:11:27,688 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-10-23 10:11:27,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-23 10:11:27,688 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:27,689 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:27,689 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:27,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:27,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1725169922, now seen corresponding path program 30 times [2018-10-23 10:11:27,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:27,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:27,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:27,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:27,690 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:27,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:28,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:28,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:28,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:28,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:28,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:28,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:28,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:28,325 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:28,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:28,353 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:28,353 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:28,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:28,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:28,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:32,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:32,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:32,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 36] total 67 [2018-10-23 10:11:32,427 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:32,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-23 10:11:32,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-23 10:11:32,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1093, Invalid=3329, Unknown=0, NotChecked=0, Total=4422 [2018-10-23 10:11:32,428 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 33 states. [2018-10-23 10:11:33,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:33,715 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2018-10-23 10:11:33,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-23 10:11:33,716 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-10-23 10:11:33,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:33,717 INFO L225 Difference]: With dead ends: 114 [2018-10-23 10:11:33,717 INFO L226 Difference]: Without dead ends: 106 [2018-10-23 10:11:33,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1093, Invalid=3329, Unknown=0, NotChecked=0, Total=4422 [2018-10-23 10:11:33,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-23 10:11:33,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-23 10:11:33,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-23 10:11:33,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-10-23 10:11:33,723 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 101 [2018-10-23 10:11:33,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:33,723 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-10-23 10:11:33,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-23 10:11:33,723 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-10-23 10:11:33,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-23 10:11:33,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:33,724 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:33,724 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:33,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:33,724 INFO L82 PathProgramCache]: Analyzing trace with hash -2123781605, now seen corresponding path program 31 times [2018-10-23 10:11:33,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:33,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:33,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:33,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:33,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:33,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:34,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:34,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:34,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:34,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:34,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:34,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:34,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:34,396 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:34,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:34,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:34,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:34,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:39,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:39,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:39,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 37] total 69 [2018-10-23 10:11:39,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:39,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-23 10:11:39,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-23 10:11:39,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1160, Invalid=3532, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 10:11:39,651 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 34 states. [2018-10-23 10:11:40,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:40,969 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2018-10-23 10:11:40,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-23 10:11:40,970 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-10-23 10:11:40,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:40,971 INFO L225 Difference]: With dead ends: 117 [2018-10-23 10:11:40,971 INFO L226 Difference]: Without dead ends: 109 [2018-10-23 10:11:40,973 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 172 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1160, Invalid=3532, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 10:11:40,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-23 10:11:40,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-23 10:11:40,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-23 10:11:40,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-23 10:11:40,978 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-23 10:11:40,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:40,978 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-23 10:11:40,978 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-23 10:11:40,978 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-23 10:11:40,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-23 10:11:40,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:40,979 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:40,979 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:40,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:40,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1579856418, now seen corresponding path program 32 times [2018-10-23 10:11:40,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:40,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:40,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:40,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:40,981 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:40,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:41,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:41,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:41,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:41,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:41,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:41,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:41,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:41,730 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:41,731 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:41,761 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:41,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:41,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:41,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:41,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:46,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:46,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:46,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 38] total 71 [2018-10-23 10:11:46,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:46,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-23 10:11:46,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-23 10:11:46,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=3741, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 10:11:46,612 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 35 states. [2018-10-23 10:11:48,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:48,226 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-10-23 10:11:48,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-23 10:11:48,226 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-10-23 10:11:48,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:48,228 INFO L225 Difference]: With dead ends: 120 [2018-10-23 10:11:48,228 INFO L226 Difference]: Without dead ends: 112 [2018-10-23 10:11:48,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 177 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1229, Invalid=3741, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 10:11:48,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-23 10:11:48,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-10-23 10:11:48,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-23 10:11:48,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-23 10:11:48,233 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2018-10-23 10:11:48,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:48,234 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-23 10:11:48,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-23 10:11:48,234 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-23 10:11:48,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-23 10:11:48,234 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:48,235 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:48,235 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:48,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:48,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1878748987, now seen corresponding path program 33 times [2018-10-23 10:11:48,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:48,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:48,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:48,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:48,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:48,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:48,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:48,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:48,980 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:48,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:48,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:48,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:48,988 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:48,988 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:49,017 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:49,017 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:49,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:49,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:53,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:53,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:53,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 39] total 73 [2018-10-23 10:11:53,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:53,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-23 10:11:53,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-23 10:11:53,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=3956, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 10:11:53,405 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 36 states. [2018-10-23 10:11:54,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:54,933 INFO L93 Difference]: Finished difference Result 123 states and 127 transitions. [2018-10-23 10:11:54,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-23 10:11:54,933 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-10-23 10:11:54,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:54,934 INFO L225 Difference]: With dead ends: 123 [2018-10-23 10:11:54,934 INFO L226 Difference]: Without dead ends: 115 [2018-10-23 10:11:54,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 182 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1300, Invalid=3956, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 10:11:54,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-23 10:11:54,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-23 10:11:54,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-23 10:11:54,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-23 10:11:54,940 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 110 [2018-10-23 10:11:54,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:54,941 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-23 10:11:54,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-23 10:11:54,941 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-23 10:11:54,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-23 10:11:54,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:54,942 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:54,942 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:54,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:54,942 INFO L82 PathProgramCache]: Analyzing trace with hash 926938302, now seen corresponding path program 34 times [2018-10-23 10:11:54,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:54,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:54,943 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:54,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:54,943 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:54,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:55,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:55,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:55,952 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:55,952 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:55,952 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:55,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:55,952 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:55,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:55,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:55,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:55,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:56,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:56,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:03,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1748 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:03,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:03,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 40] total 75 [2018-10-23 10:12:03,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:03,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-23 10:12:03,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-23 10:12:03,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1373, Invalid=4176, Unknown=1, NotChecked=0, Total=5550 [2018-10-23 10:12:03,367 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 37 states. [2018-10-23 10:12:04,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:04,941 INFO L93 Difference]: Finished difference Result 126 states and 130 transitions. [2018-10-23 10:12:04,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-23 10:12:04,942 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-10-23 10:12:04,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:04,943 INFO L225 Difference]: With dead ends: 126 [2018-10-23 10:12:04,943 INFO L226 Difference]: Without dead ends: 118 [2018-10-23 10:12:04,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 187 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1373, Invalid=4176, Unknown=1, NotChecked=0, Total=5550 [2018-10-23 10:12:04,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-23 10:12:04,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-10-23 10:12:04,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-23 10:12:04,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-23 10:12:04,948 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2018-10-23 10:12:04,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:04,949 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-23 10:12:04,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-23 10:12:04,949 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-23 10:12:04,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-23 10:12:04,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:04,950 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:04,950 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:04,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:04,950 INFO L82 PathProgramCache]: Analyzing trace with hash 908909659, now seen corresponding path program 35 times [2018-10-23 10:12:04,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:04,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:04,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:04,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:04,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:04,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:06,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:06,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:06,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:06,367 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:06,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:06,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:06,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:06,374 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:12:06,374 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:12:06,406 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:12:06,406 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:06,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:06,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:06,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:11,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:11,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:11,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 41] total 77 [2018-10-23 10:12:11,972 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:11,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-23 10:12:11,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-23 10:12:11,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1448, Invalid=4404, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 10:12:11,973 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 38 states. [2018-10-23 10:12:13,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:13,730 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2018-10-23 10:12:13,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-23 10:12:13,730 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-10-23 10:12:13,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:13,731 INFO L225 Difference]: With dead ends: 129 [2018-10-23 10:12:13,731 INFO L226 Difference]: Without dead ends: 121 [2018-10-23 10:12:13,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 192 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1448, Invalid=4404, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 10:12:13,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-23 10:12:13,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-10-23 10:12:13,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-10-23 10:12:13,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-10-23 10:12:13,735 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 116 [2018-10-23 10:12:13,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:13,735 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-10-23 10:12:13,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-23 10:12:13,736 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-10-23 10:12:13,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-23 10:12:13,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:13,736 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:13,737 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:13,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:13,737 INFO L82 PathProgramCache]: Analyzing trace with hash 688518046, now seen corresponding path program 36 times [2018-10-23 10:12:13,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:13,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:13,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:13,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:13,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:13,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:14,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:14,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:14,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:14,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:14,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:14,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:14,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:14,657 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:12:14,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:12:14,686 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:12:14,686 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:14,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:14,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:14,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:19,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:19,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:19,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 42] total 79 [2018-10-23 10:12:19,802 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:19,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-23 10:12:19,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-23 10:12:19,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1525, Invalid=4637, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 10:12:19,804 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 39 states. [2018-10-23 10:12:22,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:22,018 INFO L93 Difference]: Finished difference Result 132 states and 136 transitions. [2018-10-23 10:12:22,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-23 10:12:22,019 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-23 10:12:22,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:22,020 INFO L225 Difference]: With dead ends: 132 [2018-10-23 10:12:22,020 INFO L226 Difference]: Without dead ends: 124 [2018-10-23 10:12:22,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 197 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1525, Invalid=4637, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 10:12:22,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-23 10:12:22,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-23 10:12:22,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-23 10:12:22,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-10-23 10:12:22,026 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 119 [2018-10-23 10:12:22,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:22,027 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-10-23 10:12:22,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-23 10:12:22,027 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-10-23 10:12:22,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-23 10:12:22,028 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:22,028 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:22,028 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:22,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:22,028 INFO L82 PathProgramCache]: Analyzing trace with hash 2006970747, now seen corresponding path program 37 times [2018-10-23 10:12:22,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:22,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:22,029 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:22,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:22,029 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:22,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:23,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:23,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:23,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:23,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:23,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:23,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:23,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:23,085 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:12:23,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:23,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:23,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:23,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:29,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:29,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:29,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 43] total 81 [2018-10-23 10:12:29,115 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:29,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-23 10:12:29,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-23 10:12:29,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1604, Invalid=4876, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 10:12:29,116 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 40 states. [2018-10-23 10:12:31,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:31,094 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-10-23 10:12:31,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-23 10:12:31,094 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-23 10:12:31,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:31,095 INFO L225 Difference]: With dead ends: 135 [2018-10-23 10:12:31,095 INFO L226 Difference]: Without dead ends: 127 [2018-10-23 10:12:31,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 202 SyntacticMatches, 3 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1604, Invalid=4876, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 10:12:31,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-23 10:12:31,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-23 10:12:31,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-23 10:12:31,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-23 10:12:31,100 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 122 [2018-10-23 10:12:31,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:31,101 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-23 10:12:31,101 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-23 10:12:31,101 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-23 10:12:31,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-23 10:12:31,102 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:31,102 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:31,102 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:31,102 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:31,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1739502978, now seen corresponding path program 38 times [2018-10-23 10:12:31,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:31,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:31,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:31,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:31,103 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:31,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:32,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:32,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:32,138 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:32,138 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:32,138 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:32,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:32,138 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:32,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:12:32,146 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:12:32,181 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:12:32,181 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:32,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:32,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:32,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:38,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:38,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 44] total 83 [2018-10-23 10:12:38,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:38,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-23 10:12:38,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-23 10:12:38,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1685, Invalid=5121, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 10:12:38,823 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 41 states. [2018-10-23 10:12:41,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:41,073 INFO L93 Difference]: Finished difference Result 138 states and 142 transitions. [2018-10-23 10:12:41,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-23 10:12:41,074 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-10-23 10:12:41,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:41,075 INFO L225 Difference]: With dead ends: 138 [2018-10-23 10:12:41,076 INFO L226 Difference]: Without dead ends: 130 [2018-10-23 10:12:41,077 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1685, Invalid=5121, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 10:12:41,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-23 10:12:41,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-10-23 10:12:41,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-23 10:12:41,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-23 10:12:41,081 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2018-10-23 10:12:41,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:41,082 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-23 10:12:41,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-23 10:12:41,082 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-23 10:12:41,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-23 10:12:41,083 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:41,083 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:41,083 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:41,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:41,083 INFO L82 PathProgramCache]: Analyzing trace with hash 376876699, now seen corresponding path program 39 times [2018-10-23 10:12:41,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:41,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:41,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:41,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:41,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:41,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:42,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:42,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:42,319 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:42,319 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:42,319 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:42,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:42,319 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:42,327 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:12:42,327 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:12:42,359 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:12:42,359 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:42,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:42,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:42,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:50,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:50,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:50,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 45] total 85 [2018-10-23 10:12:50,136 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:50,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-23 10:12:50,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-23 10:12:50,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1768, Invalid=5371, Unknown=1, NotChecked=0, Total=7140 [2018-10-23 10:12:50,138 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 42 states. [2018-10-23 10:12:52,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:52,313 INFO L93 Difference]: Finished difference Result 141 states and 145 transitions. [2018-10-23 10:12:52,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-23 10:12:52,314 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-10-23 10:12:52,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:52,315 INFO L225 Difference]: With dead ends: 141 [2018-10-23 10:12:52,315 INFO L226 Difference]: Without dead ends: 133 [2018-10-23 10:12:52,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1768, Invalid=5371, Unknown=1, NotChecked=0, Total=7140 [2018-10-23 10:12:52,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-23 10:12:52,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-23 10:12:52,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-23 10:12:52,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-23 10:12:52,322 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 128 [2018-10-23 10:12:52,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:52,323 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-23 10:12:52,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-23 10:12:52,323 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-23 10:12:52,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-23 10:12:52,323 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:52,324 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:52,324 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:52,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:52,324 INFO L82 PathProgramCache]: Analyzing trace with hash -676071074, now seen corresponding path program 40 times [2018-10-23 10:12:52,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:52,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:52,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:52,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:52,325 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:52,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:53,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:53,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:53,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:53,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:53,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:53,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:53,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:53,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:53,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:12:53,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:53,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:53,443 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:53,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:00,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:00,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:00,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 46] total 87 [2018-10-23 10:13:00,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:00,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-23 10:13:00,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-23 10:13:00,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1853, Invalid=5629, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 10:13:00,508 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 43 states. [2018-10-23 10:13:02,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:02,709 INFO L93 Difference]: Finished difference Result 144 states and 148 transitions. [2018-10-23 10:13:02,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-23 10:13:02,709 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-23 10:13:02,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:02,711 INFO L225 Difference]: With dead ends: 144 [2018-10-23 10:13:02,711 INFO L226 Difference]: Without dead ends: 136 [2018-10-23 10:13:02,712 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1853, Invalid=5629, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 10:13:02,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-23 10:13:02,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-10-23 10:13:02,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-23 10:13:02,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-23 10:13:02,717 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 131 [2018-10-23 10:13:02,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:02,717 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-23 10:13:02,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-23 10:13:02,717 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-23 10:13:02,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-23 10:13:02,718 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:02,718 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:02,719 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:02,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:02,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1397953467, now seen corresponding path program 41 times [2018-10-23 10:13:02,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:02,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:02,720 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:02,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:02,720 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:02,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:04,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:04,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:04,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:04,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:04,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:04,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:04,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:04,086 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:13:04,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:13:04,139 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:13:04,139 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:04,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:04,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:11,750 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:11,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:11,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 47] total 89 [2018-10-23 10:13:11,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:11,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-23 10:13:11,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-23 10:13:11,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1940, Invalid=5892, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 10:13:11,771 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 44 states. [2018-10-23 10:13:13,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:13,981 INFO L93 Difference]: Finished difference Result 147 states and 151 transitions. [2018-10-23 10:13:13,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-23 10:13:13,981 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-23 10:13:13,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:13,983 INFO L225 Difference]: With dead ends: 147 [2018-10-23 10:13:13,983 INFO L226 Difference]: Without dead ends: 139 [2018-10-23 10:13:13,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1940, Invalid=5892, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 10:13:13,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-23 10:13:13,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-23 10:13:13,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-23 10:13:13,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-23 10:13:13,989 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-23 10:13:13,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:13,989 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-23 10:13:13,990 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-23 10:13:13,990 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-23 10:13:13,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-23 10:13:13,990 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:13,991 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:13,991 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:13,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:13,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1263534142, now seen corresponding path program 42 times [2018-10-23 10:13:13,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:13,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:13,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:13,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:13,992 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:15,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:15,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:15,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:15,407 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:15,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:15,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:15,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:15,417 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:13:15,417 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:13:15,452 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:13:15,452 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:15,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:15,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:15,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:22,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:22,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:22,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 48] total 91 [2018-10-23 10:13:22,175 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:22,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-23 10:13:22,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-23 10:13:22,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2029, Invalid=6161, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 10:13:22,177 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 45 states. [2018-10-23 10:13:24,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:24,565 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-10-23 10:13:24,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-23 10:13:24,566 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-10-23 10:13:24,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:24,567 INFO L225 Difference]: With dead ends: 150 [2018-10-23 10:13:24,567 INFO L226 Difference]: Without dead ends: 142 [2018-10-23 10:13:24,568 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 227 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=2029, Invalid=6161, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 10:13:24,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-23 10:13:24,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-23 10:13:24,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-23 10:13:24,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-10-23 10:13:24,572 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2018-10-23 10:13:24,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:24,572 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-10-23 10:13:24,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-23 10:13:24,573 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-10-23 10:13:24,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-23 10:13:24,573 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:24,574 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:24,574 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:24,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:24,574 INFO L82 PathProgramCache]: Analyzing trace with hash -313057061, now seen corresponding path program 43 times [2018-10-23 10:13:24,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:24,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:24,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:24,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:24,575 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:24,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:25,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:25,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:25,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:25,837 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:25,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:25,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:25,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:25,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:25,848 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:13:25,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:25,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:25,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:25,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:34,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:34,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 49] total 93 [2018-10-23 10:13:34,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:34,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-23 10:13:34,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-23 10:13:34,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2120, Invalid=6436, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 10:13:34,006 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 46 states. [2018-10-23 10:13:36,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:36,484 INFO L93 Difference]: Finished difference Result 153 states and 157 transitions. [2018-10-23 10:13:36,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-23 10:13:36,484 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-10-23 10:13:36,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:36,486 INFO L225 Difference]: With dead ends: 153 [2018-10-23 10:13:36,486 INFO L226 Difference]: Without dead ends: 145 [2018-10-23 10:13:36,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 232 SyntacticMatches, 3 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=2120, Invalid=6436, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 10:13:36,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-23 10:13:36,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-10-23 10:13:36,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-10-23 10:13:36,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-10-23 10:13:36,492 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 140 [2018-10-23 10:13:36,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:36,492 INFO L481 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-10-23 10:13:36,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-23 10:13:36,492 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-10-23 10:13:36,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-23 10:13:36,493 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:36,493 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:36,493 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:36,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:36,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1220763422, now seen corresponding path program 44 times [2018-10-23 10:13:36,494 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:36,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:36,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:36,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:36,495 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:37,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:37,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:37,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:37,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:37,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:37,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:37,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:37,771 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:13:37,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:13:37,822 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:13:37,822 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:37,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:37,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:37,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2923 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:47,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:47,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 50] total 95 [2018-10-23 10:13:47,324 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:47,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-23 10:13:47,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-23 10:13:47,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2213, Invalid=6716, Unknown=1, NotChecked=0, Total=8930 [2018-10-23 10:13:47,325 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 47 states. [2018-10-23 10:13:50,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:50,349 INFO L93 Difference]: Finished difference Result 156 states and 160 transitions. [2018-10-23 10:13:50,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-23 10:13:50,349 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-10-23 10:13:50,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:50,351 INFO L225 Difference]: With dead ends: 156 [2018-10-23 10:13:50,351 INFO L226 Difference]: Without dead ends: 148 [2018-10-23 10:13:50,352 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 237 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=2213, Invalid=6716, Unknown=1, NotChecked=0, Total=8930 [2018-10-23 10:13:50,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-23 10:13:50,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-10-23 10:13:50,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-23 10:13:50,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-23 10:13:50,357 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 143 [2018-10-23 10:13:50,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:50,357 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-23 10:13:50,357 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-23 10:13:50,357 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-23 10:13:50,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-23 10:13:50,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:50,358 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:50,358 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:50,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:50,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1109710331, now seen corresponding path program 45 times [2018-10-23 10:13:50,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:50,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:50,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:50,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:50,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:50,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:51,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:51,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:51,830 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:51,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:51,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:51,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:51,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:51,840 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:13:51,840 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:13:51,878 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:13:51,879 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:51,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:51,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:59,927 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:59,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:59,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 51] total 97 [2018-10-23 10:13:59,947 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:59,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-23 10:13:59,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-23 10:13:59,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2308, Invalid=7004, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 10:13:59,948 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 48 states. [2018-10-23 10:14:02,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:14:02,573 INFO L93 Difference]: Finished difference Result 159 states and 163 transitions. [2018-10-23 10:14:02,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-23 10:14:02,573 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-10-23 10:14:02,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:14:02,574 INFO L225 Difference]: With dead ends: 159 [2018-10-23 10:14:02,574 INFO L226 Difference]: Without dead ends: 151 [2018-10-23 10:14:02,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 242 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=2308, Invalid=7004, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 10:14:02,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-23 10:14:02,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-23 10:14:02,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-23 10:14:02,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-23 10:14:02,581 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 146 [2018-10-23 10:14:02,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:14:02,581 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-23 10:14:02,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-23 10:14:02,581 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-23 10:14:02,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-23 10:14:02,582 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:14:02,582 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:14:02,583 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:14:02,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:14:02,583 INFO L82 PathProgramCache]: Analyzing trace with hash -148105730, now seen corresponding path program 46 times [2018-10-23 10:14:02,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:14:02,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:14:02,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:14:02,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:14:02,584 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:14:02,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:14:03,890 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:14:03,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:14:03,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:14:03,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:14:03,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:14:03,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:14:03,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:14:03,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:14:03,899 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:14:03,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:14:03,938 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:14:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:14:03,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:14:12,328 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:14:12,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:14:12,348 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 52] total 99 [2018-10-23 10:14:12,348 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:14:12,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-23 10:14:12,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-23 10:14:12,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2405, Invalid=7297, Unknown=0, NotChecked=0, Total=9702 [2018-10-23 10:14:12,349 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 49 states. [2018-10-23 10:14:15,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:14:15,069 INFO L93 Difference]: Finished difference Result 162 states and 166 transitions. [2018-10-23 10:14:15,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-23 10:14:15,070 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-10-23 10:14:15,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:14:15,071 INFO L225 Difference]: With dead ends: 162 [2018-10-23 10:14:15,071 INFO L226 Difference]: Without dead ends: 154 [2018-10-23 10:14:15,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 247 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=2405, Invalid=7297, Unknown=0, NotChecked=0, Total=9702 [2018-10-23 10:14:15,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-23 10:14:15,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-10-23 10:14:15,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-23 10:14:15,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-23 10:14:15,078 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 149 [2018-10-23 10:14:15,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:14:15,078 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-23 10:14:15,078 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-23 10:14:15,078 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-23 10:14:15,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-23 10:14:15,079 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:14:15,079 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:14:15,079 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:14:15,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:14:15,080 INFO L82 PathProgramCache]: Analyzing trace with hash 1843278619, now seen corresponding path program 47 times [2018-10-23 10:14:15,080 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:14:15,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:14:15,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:14:15,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:14:15,081 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:14:15,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-23 10:14:17,670 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-23 10:14:17,674 WARN L205 ceAbstractionStarter]: Timeout [2018-10-23 10:14:17,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:14:17 BoogieIcfgContainer [2018-10-23 10:14:17,674 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 10:14:17,675 INFO L168 Benchmark]: Toolchain (without parser) took 250965.44 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 861.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -775.2 MB). Peak memory consumption was 86.2 MB. Max. memory is 7.1 GB. [2018-10-23 10:14:17,676 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:14:17,676 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 10:14:17,677 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.89 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:14:17,677 INFO L168 Benchmark]: Boogie Preprocessor took 26.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:14:17,677 INFO L168 Benchmark]: RCFGBuilder took 407.52 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 761.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -803.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-23 10:14:17,678 INFO L168 Benchmark]: TraceAbstraction took 250211.16 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 99.6 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 17.3 MB). Peak memory consumption was 116.9 MB. Max. memory is 7.1 GB. [2018-10-23 10:14:17,681 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 291.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 23.89 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 407.52 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 761.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -803.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 250211.16 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 99.6 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 17.3 MB). Peak memory consumption was 116.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 2]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 2). Cancelled while BasicCegarLoop was analyzing trace of length 153 with TraceHistMax 48,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 49 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 250.1s OverallTime, 49 OverallIterations, 48 TraceHistogramMax, 51.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1665 SDtfs, 47 SDslu, 43617 SDs, 0 SdLazy, 74825 SolverSat, 47 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 42.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8723 GetRequests, 6191 SyntacticMatches, 139 SemanticMatches, 2393 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 187.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=154occurred in iteration=48, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 48 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 1.4s SatisfiabilityAnalysisTime, 191.4s InterpolantComputationTime, 7519 NumberOfCodeBlocks, 7519 NumberOfCodeBlocksAsserted, 124 NumberOfCheckSat, 11128 ConstructedInterpolants, 0 QuantifiedInterpolants, 9998194 SizeOfPredicates, 0 NumberOfNonLiveVariables, 6463 ConjunctsInSsa, 2576 ConjunctsInUnsatCore, 140 InterpolantComputations, 2 PerfectInterpolantSequences, 0/152421 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown