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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 13:00:23,733 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 13:00:23,735 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 13:00:23,747 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 13:00:23,778 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-05 13:00:23,792 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 13:00:23,792 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 13:00:23,793 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-05 13:00:23,793 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-05 13:00:23,794 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-05 13:00:23,794 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-05 13:00:23,794 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-05 13:00:23,794 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-05 13:00:23,794 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-05 13:00:23,795 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-05 13:00:23,795 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 13:00:23,795 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 13:00:23,796 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 13:00:23,796 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 13:00:23,796 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 13:00:23,796 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 13:00:23,796 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 13:00:23,797 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 13:00:23,797 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 13:00:23,797 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 13:00:23,797 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 13:00:23,798 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-05 13:00:23,798 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 13:00:23,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 13:00:23,798 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 13:00:23,798 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 13:00:23,799 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-05 13:00:23,799 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 13:00:23,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 13:00:23,799 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-05 13:00:23,827 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 13:00:23,838 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 13:00:23,842 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 13:00:23,843 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 13:00:23,843 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 13:00:23,844 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-09-05 13:00:23,900 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9206a8884/cf82990fef634d9e9ccb9f7a17e83cf5/FLAG11bb824cf [2019-09-05 13:00:24,315 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 13:00:24,316 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-09-05 13:00:24,321 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9206a8884/cf82990fef634d9e9ccb9f7a17e83cf5/FLAG11bb824cf [2019-09-05 13:00:24,722 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9206a8884/cf82990fef634d9e9ccb9f7a17e83cf5 [2019-09-05 13:00:24,732 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 13:00:24,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 13:00:24,735 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:24,735 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 13:00:24,738 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 13:00:24,739 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:24,742 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12f71350 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24, skipping insertion in model container [2019-09-05 13:00:24,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:24,749 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 13:00:24,765 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 13:00:24,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:24,971 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 13:00:24,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:24,995 INFO L192 MainTranslator]: Completed translation [2019-09-05 13:00:24,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24 WrapperNode [2019-09-05 13:00:24,995 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:24,996 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 13:00:24,996 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 13:00:24,996 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 13:00:25,090 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,092 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,098 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,098 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,107 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,112 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,112 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (1/1) ... [2019-09-05 13:00:25,113 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 13:00:25,114 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 13:00:25,114 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 13:00:25,114 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 13:00:25,115 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (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 [2019-09-05 13:00:25,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 13:00:25,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 13:00:25,172 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 13:00:25,172 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 13:00:25,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 13:00:25,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 13:00:25,173 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 13:00:25,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 13:00:25,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 13:00:25,327 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 13:00:25,328 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 13:00:25,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:25 BoogieIcfgContainer [2019-09-05 13:00:25,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 13:00:25,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 13:00:25,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 13:00:25,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 13:00:25,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 01:00:24" (1/3) ... [2019-09-05 13:00:25,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50aa04c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:25, skipping insertion in model container [2019-09-05 13:00:25,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:24" (2/3) ... [2019-09-05 13:00:25,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50aa04c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:25, skipping insertion in model container [2019-09-05 13:00:25,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:25" (3/3) ... [2019-09-05 13:00:25,336 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2019-09-05 13:00:25,345 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 13:00:25,351 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 13:00:25,366 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 13:00:25,390 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 13:00:25,390 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-05 13:00:25,390 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 13:00:25,390 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 13:00:25,390 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 13:00:25,391 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 13:00:25,391 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 13:00:25,391 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 13:00:25,405 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-05 13:00:25,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 13:00:25,414 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:25,415 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:25,417 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:25,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:25,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-05 13:00:25,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:25,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:25,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:25,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:25,460 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:25,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:25,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:25,636 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:00:25,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 13:00:25,637 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:00:25,649 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 13:00:25,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 13:00:25,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 13:00:25,686 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-09-05 13:00:25,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:25,749 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-05 13:00:25,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 13:00:25,751 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 13:00:25,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:25,763 INFO L225 Difference]: With dead ends: 18 [2019-09-05 13:00:25,763 INFO L226 Difference]: Without dead ends: 12 [2019-09-05 13:00:25,767 INFO L628 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 [2019-09-05 13:00:25,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-05 13:00:25,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-05 13:00:25,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-05 13:00:25,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-05 13:00:25,806 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-05 13:00:25,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:25,807 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-05 13:00:25,810 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 13:00:25,810 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-05 13:00:25,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-05 13:00:25,811 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:25,813 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:25,813 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:25,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:25,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-05 13:00:25,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:25,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:25,818 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:25,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:25,818 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:25,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:25,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:25,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:25,915 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:25,916 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-05 13:00:25,918 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-05 13:00:25,950 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:00:25,950 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:00:26,044 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-05 13:00:26,311 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:00:26,314 INFO L272 AbstractInterpreter]: Visited 11 different actions 47 times. Merged at 2 different actions 12 times. Widened at 1 different actions 4 times. Performed 89 root evaluator evaluations with a maximum evaluation depth of 12. Performed 89 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-05 13:00:26,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:26,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:00:26,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:26,320 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:26,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:26,341 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:26,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:26,366 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-05 13:00:26,372 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:26,417 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,418 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:26,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 13:00:26,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:26,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-09-05 13:00:26,458 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:26,459 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 13:00:26,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 13:00:26,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-09-05 13:00:26,461 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2019-09-05 13:00:26,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:26,480 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-05 13:00:26,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-05 13:00:26,481 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-09-05 13:00:26,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:26,482 INFO L225 Difference]: With dead ends: 13 [2019-09-05 13:00:26,483 INFO L226 Difference]: Without dead ends: 13 [2019-09-05 13:00:26,484 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-09-05 13:00:26,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-05 13:00:26,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-05 13:00:26,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-05 13:00:26,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-05 13:00:26,487 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-05 13:00:26,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:26,488 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-05 13:00:26,488 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 13:00:26,488 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-05 13:00:26,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-05 13:00:26,489 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:26,489 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:26,490 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:26,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:26,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-05 13:00:26,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:26,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:26,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:26,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:26,503 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:26,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:26,635 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:26,636 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:26,636 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:26,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:26,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:26,638 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:26,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:26,658 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:00:26,678 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 13:00:26,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:26,679 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-05 13:00:26,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:26,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,707 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:26,762 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:26,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2019-09-05 13:00:26,766 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:26,767 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-05 13:00:26,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-05 13:00:26,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-09-05 13:00:26,768 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-05 13:00:26,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:26,791 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-05 13:00:26,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-05 13:00:26,792 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2019-09-05 13:00:26,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:26,793 INFO L225 Difference]: With dead ends: 14 [2019-09-05 13:00:26,793 INFO L226 Difference]: Without dead ends: 14 [2019-09-05 13:00:26,793 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-09-05 13:00:26,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-05 13:00:26,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-05 13:00:26,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 13:00:26,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-05 13:00:26,796 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-05 13:00:26,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:26,797 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-05 13:00:26,797 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-05 13:00:26,797 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-05 13:00:26,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 13:00:26,798 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:26,798 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:26,798 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:26,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:26,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-05 13:00:26,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:26,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:26,800 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:26,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:26,800 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:26,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:26,902 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:26,904 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:26,904 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:26,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:26,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:26,905 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:26,921 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:00:26,921 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:00:26,933 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:00:26,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:26,934 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-05 13:00:26,935 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:26,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:26,957 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:27,031 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:27,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2019-09-05 13:00:27,035 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:27,036 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 13:00:27,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 13:00:27,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-09-05 13:00:27,036 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2019-09-05 13:00:27,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:27,084 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-05 13:00:27,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:00:27,085 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-09-05 13:00:27,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:27,086 INFO L225 Difference]: With dead ends: 15 [2019-09-05 13:00:27,086 INFO L226 Difference]: Without dead ends: 15 [2019-09-05 13:00:27,087 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-09-05 13:00:27,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-05 13:00:27,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-05 13:00:27,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-05 13:00:27,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-05 13:00:27,090 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-05 13:00:27,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:27,091 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-05 13:00:27,091 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 13:00:27,091 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-05 13:00:27,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-05 13:00:27,092 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:27,092 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:27,093 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:27,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:27,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-05 13:00:27,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:27,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,095 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:27,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,096 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:27,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:27,236 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:27,236 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:27,236 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:27,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:27,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:27,237 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:27,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:27,258 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:00:27,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:27,275 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 13:00:27,276 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:27,300 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,300 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:27,385 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:27,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2019-09-05 13:00:27,389 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:27,389 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-05 13:00:27,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-05 13:00:27,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-09-05 13:00:27,390 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2019-09-05 13:00:27,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:27,437 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-05 13:00:27,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 13:00:27,437 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-09-05 13:00:27,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:27,438 INFO L225 Difference]: With dead ends: 16 [2019-09-05 13:00:27,438 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 13:00:27,439 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-09-05 13:00:27,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 13:00:27,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 13:00:27,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 13:00:27,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-05 13:00:27,442 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-05 13:00:27,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:27,442 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-05 13:00:27,443 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-05 13:00:27,443 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-05 13:00:27,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-05 13:00:27,443 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:27,444 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:27,444 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:27,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:27,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-05 13:00:27,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:27,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:27,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,446 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:27,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:27,562 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:27,562 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:27,562 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:27,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:27,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:27,563 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:27,576 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:27,577 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:00:27,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-05 13:00:27,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:27,598 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 13:00:27,599 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:27,628 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,629 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:27,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:27,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:27,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-05 13:00:27,749 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:27,749 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-05 13:00:27,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-05 13:00:27,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2019-09-05 13:00:27,750 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 9 states. [2019-09-05 13:00:27,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:27,805 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-05 13:00:27,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 13:00:27,807 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-09-05 13:00:27,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:27,808 INFO L225 Difference]: With dead ends: 17 [2019-09-05 13:00:27,808 INFO L226 Difference]: Without dead ends: 17 [2019-09-05 13:00:27,809 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2019-09-05 13:00:27,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-05 13:00:27,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-05 13:00:27,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-05 13:00:27,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-05 13:00:27,814 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-05 13:00:27,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:27,814 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-05 13:00:27,814 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-05 13:00:27,814 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-05 13:00:27,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 13:00:27,815 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:27,815 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:27,816 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:27,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:27,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-05 13:00:27,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:27,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,818 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:27,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:27,818 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:41,107 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 18 [2019-09-05 13:00:41,144 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:41,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:41,145 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:41,145 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:41,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:41,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:41,145 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:41,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:00:41,159 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:41,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:00:41,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:41,183 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 20 conjunts are in the unsatisfiable core [2019-09-05 13:00:41,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:01:07,907 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:01:07,909 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:01:07,912 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:01:07,913 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:01:07,916 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:01:14,788 WARN L188 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 62 DAG size of output: 38 [2019-09-05 13:01:16,789 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:01:16,790 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:02:06,491 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 16 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:02:06,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:02:06,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2019-09-05 13:02:06,494 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:02:06,495 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-05 13:02:06,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-05 13:02:06,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=445, Unknown=33, NotChecked=0, Total=600 [2019-09-05 13:02:06,496 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 19 states. [2019-09-05 13:02:07,311 WARN L188 SmtUtils]: Spent 478.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2019-09-05 13:02:07,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:02:07,821 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2019-09-05 13:02:07,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-05 13:02:07,821 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 16 [2019-09-05 13:02:07,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:02:07,823 INFO L225 Difference]: With dead ends: 25 [2019-09-05 13:02:07,823 INFO L226 Difference]: Without dead ends: 19 [2019-09-05 13:02:07,824 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 99.0s TimeCoverageRelationStatistics Valid=133, Invalid=536, Unknown=33, NotChecked=0, Total=702 [2019-09-05 13:02:07,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-05 13:02:07,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-09-05 13:02:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-05 13:02:07,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-09-05 13:02:07,828 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-09-05 13:02:07,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:02:07,828 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-09-05 13:02:07,828 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-05 13:02:07,828 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-09-05 13:02:07,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-05 13:02:07,829 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:02:07,829 INFO L399 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:02:07,829 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:02:07,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:02:07,830 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 7 times [2019-09-05 13:02:07,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:02:07,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:02:07,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:02:07,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:02:07,831 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:02:07,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:02:07,950 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 13:02:07,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:02:07,951 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:02:07,951 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:02:07,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:02:07,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:02:07,952 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:02:07,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:02:07,964 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:02:07,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:02:07,979 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 13:02:07,981 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:02:08,011 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 13:02:08,011 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:02:08,160 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 13:02:08,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:02:08,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2019-09-05 13:02:08,169 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:02:08,169 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 13:02:08,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 13:02:08,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2019-09-05 13:02:08,170 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2019-09-05 13:02:08,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:02:08,216 INFO L93 Difference]: Finished difference Result 12 states and 11 transitions. [2019-09-05 13:02:08,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-05 13:02:08,217 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-09-05 13:02:08,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:02:08,217 INFO L225 Difference]: With dead ends: 12 [2019-09-05 13:02:08,217 INFO L226 Difference]: Without dead ends: 0 [2019-09-05 13:02:08,218 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2019-09-05 13:02:08,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-05 13:02:08,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-05 13:02:08,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-05 13:02:08,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-05 13:02:08,219 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2019-09-05 13:02:08,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:02:08,219 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-05 13:02:08,219 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 13:02:08,219 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-05 13:02:08,219 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-05 13:02:08,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.09 01:02:08 BoogieIcfgContainer [2019-09-05 13:02:08,224 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-05 13:02:08,226 INFO L168 Benchmark]: Toolchain (without parser) took 103492.24 ms. Allocated memory was 139.5 MB in the beginning and 260.6 MB in the end (delta: 121.1 MB). Free memory was 87.4 MB in the beginning and 195.1 MB in the end (delta: -107.7 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,227 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 105.6 MB in the beginning and 105.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,228 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.86 ms. Allocated memory is still 139.5 MB. Free memory was 87.0 MB in the beginning and 78.0 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,230 INFO L168 Benchmark]: Boogie Preprocessor took 117.71 ms. Allocated memory was 139.5 MB in the beginning and 198.7 MB in the end (delta: 59.2 MB). Free memory was 78.0 MB in the beginning and 176.2 MB in the end (delta: -98.3 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,231 INFO L168 Benchmark]: RCFGBuilder took 215.25 ms. Allocated memory is still 198.7 MB. Free memory was 176.2 MB in the beginning and 165.1 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,232 INFO L168 Benchmark]: TraceAbstraction took 102894.64 ms. Allocated memory was 198.7 MB in the beginning and 260.6 MB in the end (delta: 61.9 MB). Free memory was 165.1 MB in the beginning and 195.1 MB in the end (delta: -30.0 MB). Peak memory consumption was 31.9 MB. Max. memory is 7.1 GB. [2019-09-05 13:02:08,236 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 105.6 MB in the beginning and 105.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 260.86 ms. Allocated memory is still 139.5 MB. Free memory was 87.0 MB in the beginning and 78.0 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.71 ms. Allocated memory was 139.5 MB in the beginning and 198.7 MB in the end (delta: 59.2 MB). Free memory was 78.0 MB in the beginning and 176.2 MB in the end (delta: -98.3 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 215.25 ms. Allocated memory is still 198.7 MB. Free memory was 176.2 MB in the beginning and 165.1 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 102894.64 ms. Allocated memory was 198.7 MB in the beginning and 260.6 MB in the end (delta: 61.9 MB). Free memory was 165.1 MB in the beginning and 195.1 MB in the end (delta: -30.0 MB). Peak memory consumption was 31.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. SAFE Result, 102.8s OverallTime, 8 OverallIterations, 8 TraceHistogramMax, 1.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 80 SDtfs, 3 SDslu, 287 SDs, 0 SdLazy, 291 SolverSat, 22 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 246 GetRequests, 152 SyntacticMatches, 8 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 100.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 100.0s InterpolantComputationTime, 208 NumberOfCodeBlocks, 208 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 285 ConstructedInterpolants, 2 QuantifiedInterpolants, 29274 SizeOfPredicates, 7 NumberOfNonLiveVariables, 313 ConjunctsInSsa, 80 ConjunctsInUnsatCore, 22 InterpolantComputations, 1 PerfectInterpolantSequences, 45/276 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...