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-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:05:49,173 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:05:49,176 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:05:49,195 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:05:49,196 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:05:49,198 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:05:49,200 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:05:49,211 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:05:49,212 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:05:49,213 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:05:49,215 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:05:49,216 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:05:49,216 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:05:49,217 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:05:49,218 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:05:49,219 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:05:49,220 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:05:49,221 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:05:49,223 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:05:49,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:05:49,226 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:05:49,227 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:05:49,228 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:05:49,229 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:05:49,231 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 01:05:49,232 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 01:05:49,232 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 01:05:49,233 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 01:05:49,233 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 01:05:49,234 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 01:05:49,235 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:05:49,235 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:05:49,236 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:05:49,237 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:05:49,238 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:05:49,238 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:05:49,239 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:05:49,239 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:05:49,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:05:49,241 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:05:49,241 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:05:49,242 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 [2019-10-15 01:05:49,256 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:05:49,257 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:05:49,263 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:05:49,263 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:05:49,263 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:05:49,264 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:05:49,264 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:05:49,264 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:05:49,264 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:05:49,265 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:05:49,265 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:05:49,265 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:05:49,265 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:05:49,265 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:05:49,266 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:05:49,266 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:05:49,266 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:05:49,267 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:05:49,268 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:05:49,268 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:05:49,268 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:05:49,268 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:05:49,268 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:05:49,269 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:05:49,269 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:05:49,270 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:05:49,270 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:05:49,270 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:05:49,270 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 [2019-10-15 01:05:49,604 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:05:49,628 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:05:49,633 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:05:49,635 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:05:49,635 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:05:49,636 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2019-10-15 01:05:49,715 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3140550c8/27e2fc22ba2b43878e8e5b30113a9fac/FLAG825671c37 [2019-10-15 01:05:50,162 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:05:50,163 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2019-10-15 01:05:50,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3140550c8/27e2fc22ba2b43878e8e5b30113a9fac/FLAG825671c37 [2019-10-15 01:05:50,585 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3140550c8/27e2fc22ba2b43878e8e5b30113a9fac [2019-10-15 01:05:50,597 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:05:50,598 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:05:50,601 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:05:50,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:05:50,604 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:05:50,605 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,608 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f0e942a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50, skipping insertion in model container [2019-10-15 01:05:50,609 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,617 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:05:50,636 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:05:50,840 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:05:50,847 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:05:50,863 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:05:50,875 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:05:50,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50 WrapperNode [2019-10-15 01:05:50,876 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:05:50,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:05:50,876 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:05:50,876 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:05:50,964 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,964 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,969 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,969 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,972 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (1/1) ... [2019-10-15 01:05:50,980 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:05:50,980 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:05:50,980 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:05:50,980 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:05:50,982 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (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 [2019-10-15 01:05:51,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:05:51,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:05:51,032 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:05:51,032 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:05:51,032 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:05:51,032 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:05:51,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:05:51,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:05:51,033 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:05:51,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:05:51,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:05:51,249 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:05:51,249 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:05:51,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:05:51 BoogieIcfgContainer [2019-10-15 01:05:51,251 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:05:51,252 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:05:51,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:05:51,256 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:05:51,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:05:50" (1/3) ... [2019-10-15 01:05:51,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bcba62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:05:51, skipping insertion in model container [2019-10-15 01:05:51,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:05:50" (2/3) ... [2019-10-15 01:05:51,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bcba62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:05:51, skipping insertion in model container [2019-10-15 01:05:51,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:05:51" (3/3) ... [2019-10-15 01:05:51,263 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-1.i [2019-10-15 01:05:51,276 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:05:51,282 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:05:51,292 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:05:51,316 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:05:51,316 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:05:51,317 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:05:51,317 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:05:51,317 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:05:51,317 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:05:51,317 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:05:51,317 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:05:51,333 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-15 01:05:51,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:05:51,337 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:51,338 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:51,340 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:51,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:51,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1266359381, now seen corresponding path program 1 times [2019-10-15 01:05:51,352 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:51,352 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280656870] [2019-10-15 01:05:51,352 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,352 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,353 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:51,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:51,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:51,515 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280656870] [2019-10-15 01:05:51,517 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:05:51,517 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:05:51,518 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271774177] [2019-10-15 01:05:51,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:05:51,528 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:51,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:05:51,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:05:51,554 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-10-15 01:05:51,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:51,639 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-10-15 01:05:51,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:05:51,641 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-10-15 01:05:51,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:51,648 INFO L225 Difference]: With dead ends: 45 [2019-10-15 01:05:51,648 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:05:51,651 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:05:51,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:05:51,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-10-15 01:05:51,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:05:51,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-15 01:05:51,683 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-10-15 01:05:51,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:51,683 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-15 01:05:51,684 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:05:51,684 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-15 01:05:51,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:05:51,685 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:51,685 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:51,685 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:51,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:51,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1008321469, now seen corresponding path program 1 times [2019-10-15 01:05:51,686 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:51,687 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429664812] [2019-10-15 01:05:51,687 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,687 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,687 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:51,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:51,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:51,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429664812] [2019-10-15 01:05:51,738 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:05:51,738 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:05:51,738 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185286242] [2019-10-15 01:05:51,741 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:05:51,741 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:51,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:05:51,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:05:51,742 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2019-10-15 01:05:51,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:51,788 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-10-15 01:05:51,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:05:51,789 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-15 01:05:51,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:51,790 INFO L225 Difference]: With dead ends: 28 [2019-10-15 01:05:51,790 INFO L226 Difference]: Without dead ends: 19 [2019-10-15 01:05:51,791 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:05:51,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-15 01:05:51,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-10-15 01:05:51,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:05:51,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-15 01:05:51,798 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2019-10-15 01:05:51,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:51,798 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-15 01:05:51,798 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:05:51,799 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-15 01:05:51,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:05:51,799 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:51,800 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:51,800 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:51,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:51,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1823795457, now seen corresponding path program 1 times [2019-10-15 01:05:51,801 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:51,801 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569185370] [2019-10-15 01:05:51,801 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,802 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:51,802 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:51,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:51,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:51,942 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569185370] [2019-10-15 01:05:51,943 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780601086] [2019-10-15 01:05:51,943 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 [2019-10-15 01:05:51,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:51,997 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:05:52,003 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:52,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:52,109 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:52,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:52,178 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [634649936] [2019-10-15 01:05:52,184 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 18 [2019-10-15 01:05:52,223 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:05:52,223 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:05:52,375 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-15 01:05:52,382 INFO L272 AbstractInterpreter]: Visited 17 different actions 90 times. Merged at 6 different actions 42 times. Widened at 3 different actions 11 times. Performed 221 root evaluator evaluations with a maximum evaluation depth of 4. Performed 221 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 9 fixpoints after 3 different actions. Largest state had 10 variables. [2019-10-15 01:05:52,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:52,389 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:05:52,390 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:52,390 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2019-10-15 01:05:52,391 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568010359] [2019-10-15 01:05:52,392 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-15 01:05:52,392 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:52,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-15 01:05:52,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-10-15 01:05:52,395 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 14 states. [2019-10-15 01:05:52,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:52,755 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-10-15 01:05:52,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-15 01:05:52,756 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 17 [2019-10-15 01:05:52,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:52,757 INFO L225 Difference]: With dead ends: 44 [2019-10-15 01:05:52,757 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:05:52,758 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=151, Invalid=401, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:05:52,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:05:52,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2019-10-15 01:05:52,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:05:52,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-10-15 01:05:52,766 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 17 [2019-10-15 01:05:52,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:52,766 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-10-15 01:05:52,767 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-15 01:05:52,767 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-10-15 01:05:52,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:05:52,768 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:52,768 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:52,973 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:52,974 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:52,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:52,974 INFO L82 PathProgramCache]: Analyzing trace with hash 2039947835, now seen corresponding path program 2 times [2019-10-15 01:05:52,975 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:52,975 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794602128] [2019-10-15 01:05:52,976 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:52,976 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:52,976 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:52,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:53,107 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:53,107 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794602128] [2019-10-15 01:05:53,108 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274600814] [2019-10-15 01:05:53,108 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) [2019-10-15 01:05:53,136 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:05:53,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:05:53,137 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:05:53,139 INFO L279 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:53,175 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:05:53,175 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:53,230 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:05:53,232 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [297882570] [2019-10-15 01:05:53,233 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-15 01:05:53,233 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-15 01:05:53,233 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:53,233 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 16 [2019-10-15 01:05:53,234 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811792054] [2019-10-15 01:05:53,234 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-15 01:05:53,234 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:53,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-15 01:05:53,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2019-10-15 01:05:53,240 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 16 states. [2019-10-15 01:05:53,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:53,600 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2019-10-15 01:05:53,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 01:05:53,601 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2019-10-15 01:05:53,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:53,604 INFO L225 Difference]: With dead ends: 77 [2019-10-15 01:05:53,604 INFO L226 Difference]: Without dead ends: 72 [2019-10-15 01:05:53,605 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:05:53,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-15 01:05:53,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 57. [2019-10-15 01:05:53,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-15 01:05:53,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2019-10-15 01:05:53,623 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 23 [2019-10-15 01:05:53,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:53,623 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2019-10-15 01:05:53,623 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-15 01:05:53,623 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2019-10-15 01:05:53,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-15 01:05:53,625 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:53,626 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:53,829 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:53,830 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:53,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:53,831 INFO L82 PathProgramCache]: Analyzing trace with hash -765399125, now seen corresponding path program 3 times [2019-10-15 01:05:53,831 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:53,832 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882572498] [2019-10-15 01:05:53,832 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:53,833 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:53,833 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:53,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:54,515 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:54,515 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882572498] [2019-10-15 01:05:54,515 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534475101] [2019-10-15 01:05:54,515 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 [2019-10-15 01:05:54,579 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:05:54,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:05:54,580 INFO L256 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:05:54,583 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:54,789 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 127 proven. 16 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2019-10-15 01:05:54,790 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:55,000 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 127 proven. 16 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2019-10-15 01:05:55,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1396639015] [2019-10-15 01:05:55,001 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-15 01:05:55,001 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-15 01:05:55,001 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:55,002 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 8, 8] total 44 [2019-10-15 01:05:55,002 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470884693] [2019-10-15 01:05:55,003 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-15 01:05:55,003 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:55,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-15 01:05:55,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1707, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 01:05:55,005 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 44 states. [2019-10-15 01:05:56,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:56,305 INFO L93 Difference]: Finished difference Result 145 states and 176 transitions. [2019-10-15 01:05:56,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 01:05:56,306 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 56 [2019-10-15 01:05:56,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:56,307 INFO L225 Difference]: With dead ends: 145 [2019-10-15 01:05:56,308 INFO L226 Difference]: Without dead ends: 105 [2019-10-15 01:05:56,310 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 762 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=607, Invalid=3683, Unknown=0, NotChecked=0, Total=4290 [2019-10-15 01:05:56,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-10-15 01:05:56,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2019-10-15 01:05:56,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-10-15 01:05:56,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2019-10-15 01:05:56,328 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 56 [2019-10-15 01:05:56,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:56,329 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2019-10-15 01:05:56,329 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-15 01:05:56,329 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2019-10-15 01:05:56,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-10-15 01:05:56,333 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:56,333 INFO L380 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:56,536 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:56,537 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:56,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:56,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1467049301, now seen corresponding path program 4 times [2019-10-15 01:05:56,538 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:56,538 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944219583] [2019-10-15 01:05:56,538 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:56,539 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:56,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:56,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:56,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-15 01:05:56,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944219583] [2019-10-15 01:05:56,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443258858] [2019-10-15 01:05:56,745 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:56,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:56,809 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:05:56,814 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:56,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-15 01:05:56,898 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:57,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-15 01:05:57,014 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [202456894] [2019-10-15 01:05:57,014 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-15 01:05:57,014 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-15 01:05:57,014 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:57,015 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2019-10-15 01:05:57,015 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944237196] [2019-10-15 01:05:57,016 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:05:57,016 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:57,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:05:57,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:05:57,017 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand 19 states. [2019-10-15 01:05:57,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:57,166 INFO L93 Difference]: Finished difference Result 248 states and 263 transitions. [2019-10-15 01:05:57,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-15 01:05:57,167 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 104 [2019-10-15 01:05:57,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:57,169 INFO L225 Difference]: With dead ends: 248 [2019-10-15 01:05:57,170 INFO L226 Difference]: Without dead ends: 243 [2019-10-15 01:05:57,170 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=341, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:05:57,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2019-10-15 01:05:57,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2019-10-15 01:05:57,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2019-10-15 01:05:57,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 253 transitions. [2019-10-15 01:05:57,208 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 253 transitions. Word has length 104 [2019-10-15 01:05:57,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:57,208 INFO L462 AbstractCegarLoop]: Abstraction has 243 states and 253 transitions. [2019-10-15 01:05:57,209 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:05:57,209 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 253 transitions. [2019-10-15 01:05:57,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2019-10-15 01:05:57,213 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:57,214 INFO L380 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:57,418 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:57,418 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:57,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:57,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1649132245, now seen corresponding path program 5 times [2019-10-15 01:05:57,419 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:57,420 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833082734] [2019-10-15 01:05:57,420 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:57,421 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:57,421 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:57,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:06:02,472 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:06:02,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833082734] [2019-10-15 01:06:02,472 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:06:02,473 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2019-10-15 01:06:02,473 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007148699] [2019-10-15 01:06:02,474 INFO L442 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-10-15 01:06:02,474 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:06:02,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-10-15 01:06:02,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5257, Invalid=5663, Unknown=0, NotChecked=0, Total=10920 [2019-10-15 01:06:02,479 INFO L87 Difference]: Start difference. First operand 243 states and 253 transitions. Second operand 105 states. [2019-10-15 01:06:04,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:06:04,124 INFO L93 Difference]: Finished difference Result 9783 states and 10243 transitions. [2019-10-15 01:06:04,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-10-15 01:06:04,125 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 242 [2019-10-15 01:06:04,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:06:04,130 INFO L225 Difference]: With dead ends: 9783 [2019-10-15 01:06:04,130 INFO L226 Difference]: Without dead ends: 0 [2019-10-15 01:06:04,159 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5261, Invalid=5869, Unknown=0, NotChecked=0, Total=11130 [2019-10-15 01:06:04,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-10-15 01:06:04,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-10-15 01:06:04,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-10-15 01:06:04,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-10-15 01:06:04,161 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 242 [2019-10-15 01:06:04,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:06:04,162 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-15 01:06:04,162 INFO L463 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-10-15 01:06:04,162 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-10-15 01:06:04,162 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-10-15 01:06:04,169 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-10-15 01:06:06,492 WARN L191 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 684 DAG size of output: 640