java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 21:05:29,082 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 21:05:29,085 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 21:05:29,102 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 21:05:29,102 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 21:05:29,104 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 21:05:29,106 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 21:05:29,114 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 21:05:29,118 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 21:05:29,122 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 21:05:29,123 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 21:05:29,125 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 21:05:29,125 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 21:05:29,127 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 21:05:29,129 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 21:05:29,130 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 21:05:29,132 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 21:05:29,132 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 21:05:29,134 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 21:05:29,138 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 21:05:29,142 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 21:05:29,144 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 21:05:29,147 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 21:05:29,147 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 21:05:29,149 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 21:05:29,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 21:05:29,152 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 21:05:29,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 21:05:29,153 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 21:05:29,154 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 21:05:29,154 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 21:05:29,155 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 21:05:29,155 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 21:05:29,155 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 21:05:29,156 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 21:05:29,157 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 21:05:29,157 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 21:05:29,171 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 21:05:29,171 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 21:05:29,172 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 21:05:29,172 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 21:05:29,173 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 21:05:29,173 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 21:05:29,173 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 21:05:29,173 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 21:05:29,173 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 21:05:29,174 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 21:05:29,174 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 21:05:29,174 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 21:05:29,174 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 21:05:29,174 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 21:05:29,175 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 21:05:29,175 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 21:05:29,175 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 21:05:29,175 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 21:05:29,175 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 21:05:29,176 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 21:05:29,176 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 21:05:29,176 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 21:05:29,176 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 21:05:29,176 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 21:05:29,177 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 21:05:29,177 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 21:05:29,177 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 21:05:29,177 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 21:05:29,177 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-13 21:05:29,455 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 21:05:29,467 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 21:05:29,470 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 21:05:29,471 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 21:05:29,472 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 21:05:29,472 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-13 21:05:29,543 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf9853d42/7bb7cf1a29a04f6e943d4791e99a2277/FLAG1a83e1b5a [2019-10-13 21:05:30,014 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 21:05:30,015 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-13 21:05:30,020 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf9853d42/7bb7cf1a29a04f6e943d4791e99a2277/FLAG1a83e1b5a [2019-10-13 21:05:30,420 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf9853d42/7bb7cf1a29a04f6e943d4791e99a2277 [2019-10-13 21:05:30,430 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 21:05:30,432 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 21:05:30,433 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 21:05:30,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 21:05:30,436 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 21:05:30,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,440 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b2439b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30, skipping insertion in model container [2019-10-13 21:05:30,440 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,447 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 21:05:30,467 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 21:05:30,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 21:05:30,652 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 21:05:30,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 21:05:30,677 INFO L192 MainTranslator]: Completed translation [2019-10-13 21:05:30,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30 WrapperNode [2019-10-13 21:05:30,678 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 21:05:30,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 21:05:30,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 21:05:30,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 21:05:30,768 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,780 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,781 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (1/1) ... [2019-10-13 21:05:30,784 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 21:05:30,785 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 21:05:30,785 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 21:05:30,785 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 21:05:30,786 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (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 [2019-10-13 21:05:30,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 21:05:30,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 21:05:30,835 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 21:05:30,835 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 21:05:30,835 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 21:05:30,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 21:05:30,836 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 21:05:30,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 21:05:30,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 21:05:31,003 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 21:05:31,004 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-13 21:05:31,005 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 09:05:31 BoogieIcfgContainer [2019-10-13 21:05:31,005 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 21:05:31,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 21:05:31,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 21:05:31,009 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 21:05:31,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 09:05:30" (1/3) ... [2019-10-13 21:05:31,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79107589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 09:05:31, skipping insertion in model container [2019-10-13 21:05:31,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:05:30" (2/3) ... [2019-10-13 21:05:31,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79107589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 09:05:31, skipping insertion in model container [2019-10-13 21:05:31,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 09:05:31" (3/3) ... [2019-10-13 21:05:31,012 INFO L109 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2019-10-13 21:05:31,019 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 21:05:31,025 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 21:05:31,035 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 21:05:31,057 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 21:05:31,058 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 21:05:31,058 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 21:05:31,058 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 21:05:31,058 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 21:05:31,058 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 21:05:31,058 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 21:05:31,059 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 21:05:31,072 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-13 21:05:31,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-13 21:05:31,076 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:05:31,077 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:05:31,078 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:05:31,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:31,083 INFO L82 PathProgramCache]: Analyzing trace with hash -873786703, now seen corresponding path program 1 times [2019-10-13 21:05:31,089 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:05:31,090 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903432256] [2019-10-13 21:05:31,090 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,090 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,090 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:05:31,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:31,375 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2019-10-13 21:05:31,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 21:05:31,390 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903432256] [2019-10-13 21:05:31,391 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 21:05:31,391 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 21:05:31,391 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741284358] [2019-10-13 21:05:31,395 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:05:31,397 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:05:31,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:05:31,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 21:05:31,419 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-10-13 21:05:31,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:05:31,476 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2019-10-13 21:05:31,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:05:31,478 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-10-13 21:05:31,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:05:31,489 INFO L225 Difference]: With dead ends: 36 [2019-10-13 21:05:31,489 INFO L226 Difference]: Without dead ends: 16 [2019-10-13 21:05:31,493 INFO L600 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 [2019-10-13 21:05:31,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-13 21:05:31,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-10-13 21:05:31,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-13 21:05:31,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-13 21:05:31,531 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-10-13 21:05:31,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:05:31,531 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-13 21:05:31,531 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:05:31,532 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-13 21:05:31,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-13 21:05:31,534 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:05:31,534 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:05:31,535 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:05:31,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:31,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1621360120, now seen corresponding path program 1 times [2019-10-13 21:05:31,537 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:05:31,538 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396420900] [2019-10-13 21:05:31,538 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,539 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:05:31,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:31,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 21:05:31,628 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396420900] [2019-10-13 21:05:31,628 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 21:05:31,630 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 21:05:31,630 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453546872] [2019-10-13 21:05:31,632 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:05:31,632 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:05:31,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:05:31,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 21:05:31,633 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-10-13 21:05:31,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:05:31,650 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2019-10-13 21:05:31,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:05:31,650 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-13 21:05:31,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:05:31,652 INFO L225 Difference]: With dead ends: 23 [2019-10-13 21:05:31,652 INFO L226 Difference]: Without dead ends: 15 [2019-10-13 21:05:31,653 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 21:05:31,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-13 21:05:31,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-13 21:05:31,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-13 21:05:31,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-10-13 21:05:31,659 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-10-13 21:05:31,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:05:31,660 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-10-13 21:05:31,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:05:31,660 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-10-13 21:05:31,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-13 21:05:31,661 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:05:31,661 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:05:31,661 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:05:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:31,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1574756514, now seen corresponding path program 1 times [2019-10-13 21:05:31,663 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:05:31,664 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848070850] [2019-10-13 21:05:31,664 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,664 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:31,665 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:05:31,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:31,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 21:05:31,761 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848070850] [2019-10-13 21:05:31,761 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061164567] [2019-10-13 21:05:31,761 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:05:31,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:31,792 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 21:05:31,798 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:05:31,843 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 21:05:31,843 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:05:31,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 21:05:31,899 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2038244720] [2019-10-13 21:05:31,906 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 15 [2019-10-13 21:05:31,942 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:05:31,942 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:05:32,016 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-10-13 21:05:32,354 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-13 21:05:32,358 INFO L272 AbstractInterpreter]: Visited 14 different actions 110 times. Merged at 5 different actions 44 times. Widened at 3 different actions 17 times. Performed 231 root evaluator evaluations with a maximum evaluation depth of 12. Performed 231 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 14 fixpoints after 3 different actions. Largest state had 4 variables. [2019-10-13 21:05:32,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:32,363 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-13 21:05:32,372 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:05:32,372 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 9 [2019-10-13 21:05:32,372 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831294661] [2019-10-13 21:05:32,375 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 21:05:32,375 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:05:32,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 21:05:32,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:05:32,377 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 9 states. [2019-10-13 21:05:32,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:05:32,663 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2019-10-13 21:05:32,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 21:05:32,664 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 14 [2019-10-13 21:05:32,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:05:32,665 INFO L225 Difference]: With dead ends: 40 [2019-10-13 21:05:32,665 INFO L226 Difference]: Without dead ends: 31 [2019-10-13 21:05:32,667 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=177, Unknown=0, NotChecked=0, Total=272 [2019-10-13 21:05:32,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-13 21:05:32,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-13 21:05:32,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-13 21:05:32,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-10-13 21:05:32,682 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 14 [2019-10-13 21:05:32,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:05:32,682 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-10-13 21:05:32,683 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 21:05:32,683 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-10-13 21:05:32,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-13 21:05:32,686 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:05:32,686 INFO L380 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:05:32,889 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:05:32,890 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:05:32,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:32,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1465881457, now seen corresponding path program 2 times [2019-10-13 21:05:32,890 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:05:32,891 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745795561] [2019-10-13 21:05:32,891 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:32,891 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:32,891 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:05:32,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:32,991 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-10-13 21:05:32,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745795561] [2019-10-13 21:05:32,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794030240] [2019-10-13 21:05:32,992 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:05:33,038 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-13 21:05:33,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 21:05:33,042 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 21:05:33,046 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:05:33,081 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-13 21:05:33,081 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:05:33,128 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-13 21:05:33,128 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2031229874] [2019-10-13 21:05:33,129 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-13 21:05:33,129 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-13 21:05:33,129 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:05:33,129 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2019-10-13 21:05:33,130 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199278276] [2019-10-13 21:05:33,130 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 21:05:33,130 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:05:33,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 21:05:33,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:05:33,131 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 9 states. [2019-10-13 21:05:33,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:05:33,241 INFO L93 Difference]: Finished difference Result 69 states and 92 transitions. [2019-10-13 21:05:33,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 21:05:33,244 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2019-10-13 21:05:33,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:05:33,245 INFO L225 Difference]: With dead ends: 69 [2019-10-13 21:05:33,245 INFO L226 Difference]: Without dead ends: 47 [2019-10-13 21:05:33,246 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2019-10-13 21:05:33,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-13 21:05:33,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-13 21:05:33,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-13 21:05:33,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-10-13 21:05:33,255 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 30 [2019-10-13 21:05:33,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:05:33,255 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-10-13 21:05:33,255 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 21:05:33,255 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-10-13 21:05:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-13 21:05:33,257 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:05:33,257 INFO L380 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:05:33,461 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:05:33,461 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:05:33,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:05:33,462 INFO L82 PathProgramCache]: Analyzing trace with hash -649475471, now seen corresponding path program 3 times [2019-10-13 21:05:33,462 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:05:33,463 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883716450] [2019-10-13 21:05:33,463 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:33,464 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:05:33,464 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:05:33,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:05:33,713 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-13 21:05:33,714 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883716450] [2019-10-13 21:05:33,714 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8415300] [2019-10-13 21:05:33,714 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:05:33,781 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 21:05:33,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 21:05:33,782 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-13 21:05:33,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:05:33,987 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 21:05:33,988 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:05:34,381 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 10 proven. 320 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 21:05:34,381 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1007438933] [2019-10-13 21:05:34,381 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-13 21:05:34,382 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-13 21:05:34,382 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:05:34,382 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12] total 29 [2019-10-13 21:05:34,382 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685072233] [2019-10-13 21:05:34,384 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 21:05:34,384 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:05:34,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 21:05:34,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2019-10-13 21:05:34,387 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 29 states. [2019-10-13 21:05:35,784 WARN L191 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 14 [2019-10-13 21:05:36,669 WARN L191 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2019-10-13 21:05:36,894 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2019-10-13 21:05:37,694 WARN L191 SmtUtils]: Spent 751.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2019-10-13 21:05:41,905 WARN L191 SmtUtils]: Spent 4.15 s on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2019-10-13 21:05:56,602 WARN L191 SmtUtils]: Spent 651.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 10 [2019-10-13 21:06:02,010 WARN L191 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 14 [2019-10-13 21:06:15,431 WARN L191 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 21 DAG size of output: 14 [2019-10-13 21:06:15,785 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 14 [2019-10-13 21:06:20,454 WARN L191 SmtUtils]: Spent 4.42 s on a formula simplification that was a NOOP. DAG size: 21 [2019-10-13 21:06:21,157 WARN L191 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 14