java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:40:17,089 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:40:17,091 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:40:17,104 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:40:17,104 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:40:17,105 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:40:17,107 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:40:17,110 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:40:17,111 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:40:17,114 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:40:17,115 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:40:17,116 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:40:17,117 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:40:17,119 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:40:17,125 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:40:17,126 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:40:17,127 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:40:17,132 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:40:17,133 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:40:17,136 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:40:17,139 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:40:17,140 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:40:17,143 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:40:17,143 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:40:17,143 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:40:17,144 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:40:17,146 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:40:17,146 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:40:17,147 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:40:17,148 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:40:17,148 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:40:17,149 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 16:40:17,149 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:40:17,149 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:40:17,150 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:40:17,151 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:40:17,151 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-11-07 16:40:17,166 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:40:17,166 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:40:17,167 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:40:17,167 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:40:17,167 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:40:17,167 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:40:17,168 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:40:17,169 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:40:17,169 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:40:17,169 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:40:17,170 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:40:17,170 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:40:17,170 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:40:17,170 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:40:17,170 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:40:17,171 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:40:17,171 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:40:17,171 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:40:17,171 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:40:17,171 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:40:17,172 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:40:17,172 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:40:17,172 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:40:17,172 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:40:17,172 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:40:17,172 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:40:17,173 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:40:17,173 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:40:17,173 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:40:17,216 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:40:17,236 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:40:17,240 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:40:17,241 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:40:17,242 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:40:17,243 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-11-07 16:40:17,310 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/383369d63/a0b62734502845839edc2ac24d9a4128/FLAG538b1dc33 [2018-11-07 16:40:17,760 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:40:17,761 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-11-07 16:40:17,767 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/383369d63/a0b62734502845839edc2ac24d9a4128/FLAG538b1dc33 [2018-11-07 16:40:17,788 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/383369d63/a0b62734502845839edc2ac24d9a4128 [2018-11-07 16:40:17,800 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:40:17,802 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:40:17,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:40:17,803 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:40:17,807 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:40:17,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:40:17" (1/1) ... [2018-11-07 16:40:17,811 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7101a57c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:17, skipping insertion in model container [2018-11-07 16:40:17,811 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:40:17" (1/1) ... [2018-11-07 16:40:17,821 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:40:17,841 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:40:18,025 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:40:18,029 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:40:18,047 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:40:18,064 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:40:18,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18 WrapperNode [2018-11-07 16:40:18,065 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:40:18,066 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:40:18,066 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:40:18,066 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:40:18,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,080 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,086 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:40:18,086 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:40:18,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:40:18,087 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:40:18,096 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,096 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,096 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,097 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,099 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,107 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,108 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... [2018-11-07 16:40:18,109 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:40:18,109 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:40:18,110 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:40:18,110 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:40:18,111 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:40:18,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:40:18,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:40:18,235 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-11-07 16:40:18,235 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-11-07 16:40:18,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:40:18,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:40:18,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:40:18,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:40:18,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:40:18,236 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:40:18,447 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:40:18,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:40:18 BoogieIcfgContainer [2018-11-07 16:40:18,448 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:40:18,449 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:40:18,449 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:40:18,461 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:40:18,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:40:17" (1/3) ... [2018-11-07 16:40:18,462 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15e3b046 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:40:18, skipping insertion in model container [2018-11-07 16:40:18,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:40:18" (2/3) ... [2018-11-07 16:40:18,463 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15e3b046 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:40:18, skipping insertion in model container [2018-11-07 16:40:18,463 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:40:18" (3/3) ... [2018-11-07 16:40:18,465 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-11-07 16:40:18,479 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:40:18,491 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:40:18,514 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:40:18,571 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:40:18,571 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:40:18,577 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:40:18,577 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:40:18,577 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:40:18,577 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:40:18,578 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:40:18,578 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:40:18,606 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-11-07 16:40:18,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 16:40:18,614 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:18,617 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:18,621 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:18,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:18,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-11-07 16:40:18,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:18,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:18,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:18,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:18,680 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:18,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:18,732 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:18,734 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:40:18,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:40:18,735 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:40:18,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:40:18,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:40:18,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:40:18,754 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-11-07 16:40:18,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:18,776 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 16:40:18,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:40:18,777 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 16:40:18,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:18,786 INFO L225 Difference]: With dead ends: 34 [2018-11-07 16:40:18,786 INFO L226 Difference]: Without dead ends: 17 [2018-11-07 16:40:18,790 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:40:18,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-11-07 16:40:18,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-11-07 16:40:18,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 16:40:18,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-11-07 16:40:18,827 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-11-07 16:40:18,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:18,827 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-11-07 16:40:18,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:40:18,828 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-11-07 16:40:18,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 16:40:18,829 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:18,829 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:18,829 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:18,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:18,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-11-07 16:40:18,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:18,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:18,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:18,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:18,832 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:18,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:19,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:19,010 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:40:19,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 16:40:19,010 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:40:19,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:40:19,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:40:19,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:40:19,013 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-11-07 16:40:19,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:19,076 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-11-07 16:40:19,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:40:19,077 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 16:40:19,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:19,079 INFO L225 Difference]: With dead ends: 26 [2018-11-07 16:40:19,079 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 16:40:19,080 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:40:19,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 16:40:19,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-11-07 16:40:19,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 16:40:19,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-11-07 16:40:19,091 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-11-07 16:40:19,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:19,091 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-11-07 16:40:19,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:40:19,091 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-11-07 16:40:19,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-07 16:40:19,092 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:19,093 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:19,093 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:19,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:19,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-11-07 16:40:19,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:19,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:19,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:19,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:19,095 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:19,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:19,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:19,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:19,429 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:19,430 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-07 16:40:19,432 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-11-07 16:40:19,467 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:40:19,467 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:40:19,558 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:40:19,728 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:40:19,730 INFO L272 AbstractInterpreter]: Visited 17 different actions 25 times. Merged at 4 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 16:40:19,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:19,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:40:19,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:19,785 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:19,805 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:19,806 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:40:19,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:19,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:19,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:20,285 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 16:40:20,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:20,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:20,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 16:40:20,547 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:20,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:40:20,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:40:20,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:40:20,548 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-11-07 16:40:20,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:20,674 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 16:40:20,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:40:20,675 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-11-07 16:40:20,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:20,677 INFO L225 Difference]: With dead ends: 30 [2018-11-07 16:40:20,677 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 16:40:20,678 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-11-07 16:40:20,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 16:40:20,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-11-07 16:40:20,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 16:40:20,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-11-07 16:40:20,685 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-11-07 16:40:20,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:20,686 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-11-07 16:40:20,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:40:20,686 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-11-07 16:40:20,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-07 16:40:20,688 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:20,688 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:20,689 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:20,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:20,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-11-07 16:40:20,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:20,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:20,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:20,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:20,691 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:20,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:20,977 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:40:20,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:20,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:20,978 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:20,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:20,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:20,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:20,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:20,995 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:21,040 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:40:21,040 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:21,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:21,156 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:40:21,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:21,864 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 16:40:21,885 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:21,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2018-11-07 16:40:21,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:21,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 16:40:21,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 16:40:21,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-11-07 16:40:21,886 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-11-07 16:40:22,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:22,062 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 16:40:22,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:40:22,069 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-11-07 16:40:22,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:22,070 INFO L225 Difference]: With dead ends: 34 [2018-11-07 16:40:22,070 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 16:40:22,071 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-11-07 16:40:22,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 16:40:22,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-11-07 16:40:22,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 16:40:22,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-11-07 16:40:22,084 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-11-07 16:40:22,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:22,084 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-11-07 16:40:22,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 16:40:22,085 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-11-07 16:40:22,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 16:40:22,086 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:22,086 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:22,086 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:22,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:22,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-11-07 16:40:22,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:22,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:22,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:22,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:22,090 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:22,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:22,373 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 16:40:22,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:22,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:22,374 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:22,374 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:22,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:22,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:22,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:40:22,383 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:40:22,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:40:22,397 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:22,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:22,462 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 16:40:22,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:40:22,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:22,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 20 [2018-11-07 16:40:22,950 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:22,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:40:22,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:40:22,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:40:22,952 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-11-07 16:40:23,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:23,159 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-11-07 16:40:23,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:40:23,164 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 16:40:23,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:23,165 INFO L225 Difference]: With dead ends: 38 [2018-11-07 16:40:23,166 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 16:40:23,166 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-11-07 16:40:23,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 16:40:23,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-11-07 16:40:23,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-11-07 16:40:23,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-11-07 16:40:23,173 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-11-07 16:40:23,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:23,173 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-11-07 16:40:23,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:40:23,174 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-11-07 16:40:23,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 16:40:23,175 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:23,176 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:23,176 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:23,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:23,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-11-07 16:40:23,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:23,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:23,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:23,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:23,178 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:23,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-07 16:40:23,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:23,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:23,450 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:23,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:23,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:23,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:23,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:23,460 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:40:23,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:23,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:23,536 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-07 16:40:23,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:24,157 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:40:24,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:24,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15] total 25 [2018-11-07 16:40:24,178 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:24,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 16:40:24,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 16:40:24,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:40:24,179 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-11-07 16:40:24,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:24,481 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-11-07 16:40:24,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 16:40:24,482 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-11-07 16:40:24,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:24,484 INFO L225 Difference]: With dead ends: 42 [2018-11-07 16:40:24,484 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 16:40:24,486 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-11-07 16:40:24,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 16:40:24,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-11-07 16:40:24,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 16:40:24,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-11-07 16:40:24,493 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-11-07 16:40:24,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:24,494 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-11-07 16:40:24,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 16:40:24,494 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-11-07 16:40:24,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 16:40:24,495 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:24,496 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:24,496 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:24,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:24,496 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-11-07 16:40:24,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:24,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:24,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:24,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:24,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:24,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:24,765 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-07 16:40:24,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:24,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:24,766 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:24,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:24,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:24,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:24,775 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:24,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:24,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 16:40:24,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:24,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:24,972 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-07 16:40:24,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:25,931 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:40:25,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:25,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18] total 30 [2018-11-07 16:40:25,951 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:25,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 16:40:25,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 16:40:25,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:40:25,953 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-11-07 16:40:26,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:26,354 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-11-07 16:40:26,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:40:26,355 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-11-07 16:40:26,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:26,356 INFO L225 Difference]: With dead ends: 46 [2018-11-07 16:40:26,356 INFO L226 Difference]: Without dead ends: 41 [2018-11-07 16:40:26,357 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 16:40:26,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-11-07 16:40:26,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-11-07 16:40:26,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 16:40:26,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-11-07 16:40:26,365 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-11-07 16:40:26,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:26,365 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-11-07 16:40:26,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 16:40:26,366 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-11-07 16:40:26,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 16:40:26,367 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:26,368 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:26,368 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:26,368 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:26,368 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-11-07 16:40:26,368 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:26,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:26,369 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:26,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:26,370 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:26,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:26,819 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:40:26,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:26,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:26,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:26,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:26,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:26,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:26,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:40:26,850 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:40:26,879 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:40:26,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:26,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:26,966 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:40:26,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:27,964 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 16:40:28,078 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 16:40:29,823 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 16:40:30,450 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:40:30,469 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:30,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21] total 35 [2018-11-07 16:40:30,470 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:30,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:40:30,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:40:30,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 16:40:30,472 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-11-07 16:40:30,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:30,938 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-11-07 16:40:30,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:40:30,940 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-11-07 16:40:30,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:30,942 INFO L225 Difference]: With dead ends: 50 [2018-11-07 16:40:30,942 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 16:40:30,944 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 16:40:30,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 16:40:30,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-11-07 16:40:30,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 16:40:30,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-11-07 16:40:30,951 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-11-07 16:40:30,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:30,951 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-11-07 16:40:30,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:40:30,952 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-11-07 16:40:30,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-07 16:40:30,953 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:30,953 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:30,953 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:30,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:30,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-11-07 16:40:30,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:30,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:30,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:30,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:30,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:30,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:31,266 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-11-07 16:40:31,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:31,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:31,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:31,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:31,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:31,268 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:31,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:31,276 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:40:31,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:31,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-11-07 16:40:31,379 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:32,441 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:40:32,463 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:32,463 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24] total 40 [2018-11-07 16:40:32,464 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:32,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:40:32,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:40:32,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1363, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:40:32,465 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-11-07 16:40:32,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:32,998 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-11-07 16:40:32,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:40:32,999 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-11-07 16:40:33,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:33,001 INFO L225 Difference]: With dead ends: 54 [2018-11-07 16:40:33,001 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 16:40:33,003 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 90 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=330, Invalid=1832, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 16:40:33,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 16:40:33,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-11-07 16:40:33,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 16:40:33,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-11-07 16:40:33,010 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-11-07 16:40:33,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:33,010 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-11-07 16:40:33,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:40:33,011 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-11-07 16:40:33,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-07 16:40:33,012 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:33,012 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:33,012 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:33,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:33,013 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-11-07 16:40:33,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:33,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:33,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:33,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:33,014 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:33,394 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 16:40:33,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:33,394 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:33,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:33,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:33,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:33,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:33,406 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:33,406 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:33,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 16:40:33,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:33,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:33,771 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 16:40:33,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:35,160 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 16:40:35,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:35,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27] total 45 [2018-11-07 16:40:35,180 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:35,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 16:40:35,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 16:40:35,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1740, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 16:40:35,182 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-11-07 16:40:35,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:35,905 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-11-07 16:40:35,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 16:40:35,906 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-11-07 16:40:35,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:35,907 INFO L225 Difference]: With dead ends: 58 [2018-11-07 16:40:35,907 INFO L226 Difference]: Without dead ends: 53 [2018-11-07 16:40:35,909 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 100 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=408, Invalid=2348, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 16:40:35,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-11-07 16:40:35,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-11-07 16:40:35,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-07 16:40:35,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-11-07 16:40:35,916 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-11-07 16:40:35,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:35,916 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-11-07 16:40:35,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 16:40:35,917 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-11-07 16:40:35,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 16:40:35,918 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:35,918 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:35,918 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:35,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:35,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-11-07 16:40:35,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:35,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:35,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:35,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:35,920 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:35,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:36,961 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 16:40:36,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:36,961 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:36,961 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:36,961 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:36,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:36,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:36,971 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:40:36,971 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:40:36,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:40:36,995 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:36,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:37,070 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 16:40:37,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:38,773 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:40:38,794 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:38,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30] total 50 [2018-11-07 16:40:38,794 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:38,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:40:38,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:40:38,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 16:40:38,797 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-11-07 16:40:39,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:39,832 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-11-07 16:40:39,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:40:39,834 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-11-07 16:40:39,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:39,836 INFO L225 Difference]: With dead ends: 62 [2018-11-07 16:40:39,836 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 16:40:39,839 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 110 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 16:40:39,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 16:40:39,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-11-07 16:40:39,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-07 16:40:39,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-11-07 16:40:39,846 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-11-07 16:40:39,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:39,847 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-11-07 16:40:39,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:40:39,847 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-11-07 16:40:39,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-07 16:40:39,849 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:39,849 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:39,849 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:39,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:39,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-11-07 16:40:39,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:39,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:39,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:39,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:39,851 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:39,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-11-07 16:40:40,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:40,535 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:40,535 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:40,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:40,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:40,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:40,546 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:40,547 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:40:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:40,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:40,807 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-11-07 16:40:40,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:43,005 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:40:43,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:43,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33] total 55 [2018-11-07 16:40:43,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:43,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 16:40:43,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 16:40:43,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2632, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 16:40:43,028 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-11-07 16:40:43,919 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 16:40:44,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:44,401 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-11-07 16:40:44,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 16:40:44,401 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-11-07 16:40:44,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:44,403 INFO L225 Difference]: With dead ends: 66 [2018-11-07 16:40:44,403 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 16:40:44,405 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 120 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=588, Invalid=3572, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 16:40:44,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 16:40:44,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-11-07 16:40:44,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 16:40:44,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-11-07 16:40:44,412 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-11-07 16:40:44,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:44,413 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-11-07 16:40:44,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 16:40:44,413 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-11-07 16:40:44,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-11-07 16:40:44,414 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:44,415 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:44,415 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:44,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:44,415 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-11-07 16:40:44,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:44,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:44,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:44,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:44,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:44,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:45,339 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-11-07 16:40:45,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:45,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:45,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:45,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:45,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:45,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:45,349 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:45,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:41:48,845 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 16:41:48,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:41:49,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:49,770 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-11-07 16:41:49,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:53,229 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-07 16:41:53,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:53,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36] total 60 [2018-11-07 16:41:53,250 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:53,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 16:41:53,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 16:41:53,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 16:41:53,252 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-11-07 16:41:55,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:41:55,042 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-11-07 16:41:55,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:41:55,042 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-11-07 16:41:55,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:41:55,044 INFO L225 Difference]: With dead ends: 70 [2018-11-07 16:41:55,044 INFO L226 Difference]: Without dead ends: 65 [2018-11-07 16:41:55,046 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 130 SyntacticMatches, 24 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 16:41:55,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-11-07 16:41:55,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-11-07 16:41:55,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 16:41:55,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-11-07 16:41:55,053 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-11-07 16:41:55,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:41:55,053 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-11-07 16:41:55,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 16:41:55,053 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-11-07 16:41:55,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-11-07 16:41:55,055 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:41:55,055 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:41:55,056 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:41:55,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:41:55,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-11-07 16:41:55,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:41:55,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:55,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:41:55,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:55,057 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:41:55,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:56,820 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 16:41:56,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:56,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:56,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:56,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:56,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:56,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:41:56,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:41:56,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:41:56,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:41:56,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:41:56,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:56,946 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 16:41:56,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:59,307 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:41:59,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:59,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39] total 65 [2018-11-07 16:41:59,328 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:59,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 16:41:59,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 16:41:59,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 16:41:59,330 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-11-07 16:42:00,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:00,379 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-11-07 16:42:00,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 16:42:00,379 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-11-07 16:42:00,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:00,381 INFO L225 Difference]: With dead ends: 74 [2018-11-07 16:42:00,381 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 16:42:00,383 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 140 SyntacticMatches, 26 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 16:42:00,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 16:42:00,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-11-07 16:42:00,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 16:42:00,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-11-07 16:42:00,390 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-11-07 16:42:00,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:00,391 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-11-07 16:42:00,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 16:42:00,391 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-11-07 16:42:00,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-11-07 16:42:00,393 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:00,393 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:00,393 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:00,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:00,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-11-07 16:42:00,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:00,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:00,394 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:42:00,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:00,395 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:00,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:01,463 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-11-07 16:42:01,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:01,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:01,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:01,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:01,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:01,464 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:42:01,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:42:01,472 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:42:01,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:01,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:42:01,625 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-11-07 16:42:01,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:42:04,322 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-07 16:42:04,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:42:04,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42] total 70 [2018-11-07 16:42:04,342 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:42:04,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 16:42:04,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 16:42:04,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 16:42:04,345 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-11-07 16:42:05,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:05,610 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-11-07 16:42:05,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 16:42:05,612 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-11-07 16:42:05,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:05,613 INFO L225 Difference]: With dead ends: 78 [2018-11-07 16:42:05,613 INFO L226 Difference]: Without dead ends: 73 [2018-11-07 16:42:05,616 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 150 SyntacticMatches, 28 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=918, Invalid=5888, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 16:42:05,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-07 16:42:05,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-11-07 16:42:05,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 16:42:05,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-11-07 16:42:05,623 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-11-07 16:42:05,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:05,624 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-11-07 16:42:05,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 16:42:05,624 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-11-07 16:42:05,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 16:42:05,626 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:05,626 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:05,626 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:05,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:05,626 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-11-07 16:42:05,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:05,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:05,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:42:05,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:05,627 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:05,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:06,610 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 16:42:06,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:06,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:06,611 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:06,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:06,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:06,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:42:06,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:42:06,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:42:08,217 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 16:42:08,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:42:08,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:42:08,312 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 16:42:08,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:42:11,570 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 16:42:11,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:42:11,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45] total 75 [2018-11-07 16:42:11,590 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:42:11,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 16:42:11,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 16:42:11,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=4968, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 16:42:11,593 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-11-07 16:42:12,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:12,932 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-11-07 16:42:12,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 16:42:12,932 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-11-07 16:42:12,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:12,934 INFO L225 Difference]: With dead ends: 82 [2018-11-07 16:42:12,934 INFO L226 Difference]: Without dead ends: 77 [2018-11-07 16:42:12,936 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 30 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1044, Invalid=6788, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 16:42:12,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-07 16:42:12,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-11-07 16:42:12,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-07 16:42:12,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-11-07 16:42:12,942 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-11-07 16:42:12,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:12,943 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-11-07 16:42:12,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 16:42:12,943 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-11-07 16:42:12,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-11-07 16:42:12,944 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:12,944 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:12,945 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:12,945 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:12,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-11-07 16:42:12,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:12,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:12,946 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:42:12,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:12,946 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:12,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:14,002 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 16:42:14,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:14,002 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:14,003 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:14,003 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:14,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:14,003 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:42:14,011 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:42:14,011 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:42:14,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:42:14,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:42:14,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:42:14,217 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 16:42:14,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:42:18,012 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-07 16:42:18,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:42:18,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48] total 80 [2018-11-07 16:42:18,034 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:42:18,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 16:42:18,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 16:42:18,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=653, Invalid=5667, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:42:18,036 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-11-07 16:42:18,779 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 16:42:20,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:20,311 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-11-07 16:42:20,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 16:42:20,311 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-11-07 16:42:20,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:20,313 INFO L225 Difference]: With dead ends: 86 [2018-11-07 16:42:20,313 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 16:42:20,315 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 170 SyntacticMatches, 32 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1178, Invalid=7752, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 16:42:20,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 16:42:20,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-11-07 16:42:20,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 16:42:20,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-11-07 16:42:20,321 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-11-07 16:42:20,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:20,321 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-11-07 16:42:20,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 16:42:20,321 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-11-07 16:42:20,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-07 16:42:20,322 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:20,322 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:20,323 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:20,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:20,323 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-11-07 16:42:20,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:20,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:20,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:42:20,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:20,324 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:20,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:21,164 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-11-07 16:42:21,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:21,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:21,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:21,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:21,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:21,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:42:21,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:42:21,174 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:42:21,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:21,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:42:21,432 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-11-07 16:42:21,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:42:25,673 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:42:25,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:42:25,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51] total 85 [2018-11-07 16:42:25,692 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:42:25,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 16:42:25,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 16:42:25,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=6412, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 16:42:25,694 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-11-07 16:42:27,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:27,588 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-11-07 16:42:27,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 16:42:27,588 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-11-07 16:42:27,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:27,590 INFO L225 Difference]: With dead ends: 90 [2018-11-07 16:42:27,590 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 16:42:27,592 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 180 SyntacticMatches, 34 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1320, Invalid=8780, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 16:42:27,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 16:42:27,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-11-07 16:42:27,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 16:42:27,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-11-07 16:42:27,598 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-11-07 16:42:27,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:27,599 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-11-07 16:42:27,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 16:42:27,599 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-11-07 16:42:27,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-07 16:42:27,600 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:27,600 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:27,600 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:27,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:27,601 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-11-07 16:42:27,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:27,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:27,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:42:27,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:27,602 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:27,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:29,284 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-11-07 16:42:29,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:29,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:29,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:29,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:29,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:29,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:42:29,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:42:29,293 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown