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/loops/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-673a906-m [2019-10-03 02:35:16,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-03 02:35:16,572 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-03 02:35:16,585 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-03 02:35:16,595 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-03 02:35:16,596 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-03 02:35:16,597 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-03 02:35:16,598 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-03 02:35:16,599 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-03 02:35:16,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-03 02:35:16,602 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-03 02:35:16,604 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-03 02:35:16,606 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-03 02:35:16,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-03 02:35:16,608 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-03 02:35:16,609 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-03 02:35:16,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-03 02:35:16,620 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-03 02:35:16,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-03 02:35:16,622 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-03 02:35:16,622 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 [2019-10-03 02:35:16,638 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-03 02:35:16,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-03 02:35:16,639 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-10-03 02:35:16,639 INFO L138 SettingsManager]: * Log level for plugins=info [2019-10-03 02:35:16,640 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-03 02:35:16,640 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-03 02:35:16,641 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-10-03 02:35:16,641 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-10-03 02:35:16,641 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-03 02:35:16,641 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-10-03 02:35:16,642 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-03 02:35:16,642 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-03 02:35:16,642 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-03 02:35:16,643 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-03 02:35:16,644 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-03 02:35:16,644 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-03 02:35:16,644 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-10-03 02:35:16,644 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-03 02:35:16,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-03 02:35:16,645 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-03 02:35:16,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-03 02:35:16,645 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-10-03 02:35:16,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-03 02:35:16,646 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-03 02:35:16,646 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-10-03 02:35:16,679 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-03 02:35:16,697 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-03 02:35:16,700 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-03 02:35:16,701 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-03 02:35:16,702 INFO L275 PluginConnector]: CDTParser initialized [2019-10-03 02:35:16,703 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2019-10-03 02:35:16,776 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bad2e60e9/c0cfb041aa2d4d45b535d5149ec83b52/FLAG54ec522fd [2019-10-03 02:35:17,322 INFO L306 CDTParser]: Found 1 translation units. [2019-10-03 02:35:17,323 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2019-10-03 02:35:17,330 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bad2e60e9/c0cfb041aa2d4d45b535d5149ec83b52/FLAG54ec522fd [2019-10-03 02:35:17,625 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bad2e60e9/c0cfb041aa2d4d45b535d5149ec83b52 [2019-10-03 02:35:17,637 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-03 02:35:17,639 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-03 02:35:17,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-03 02:35:17,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-03 02:35:17,647 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-03 02:35:17,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:17,652 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16b6e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17, skipping insertion in model container [2019-10-03 02:35:17,652 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:17,661 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-03 02:35:17,685 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-03 02:35:17,937 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 02:35:17,942 INFO L188 MainTranslator]: Completed pre-run [2019-10-03 02:35:17,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 02:35:17,976 INFO L192 MainTranslator]: Completed translation [2019-10-03 02:35:17,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17 WrapperNode [2019-10-03 02:35:17,977 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-03 02:35:17,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-03 02:35:17,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-03 02:35:17,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-03 02:35:17,993 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:17,994 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,000 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,109 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,117 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,118 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (1/1) ... [2019-10-03 02:35:18,120 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-03 02:35:18,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-03 02:35:18,121 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-03 02:35:18,121 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-03 02:35:18,122 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (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 [2019-10-03 02:35:18,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-03 02:35:18,204 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-03 02:35:18,204 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-03 02:35:18,204 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-03 02:35:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-03 02:35:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-03 02:35:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-03 02:35:18,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-03 02:35:18,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-03 02:35:18,417 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-03 02:35:18,417 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-03 02:35:18,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 02:35:18 BoogieIcfgContainer [2019-10-03 02:35:18,419 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-03 02:35:18,420 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-03 02:35:18,421 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-03 02:35:18,424 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-03 02:35:18,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.10 02:35:17" (1/3) ... [2019-10-03 02:35:18,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bcc624b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.10 02:35:18, skipping insertion in model container [2019-10-03 02:35:18,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:35:17" (2/3) ... [2019-10-03 02:35:18,427 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bcc624b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.10 02:35:18, skipping insertion in model container [2019-10-03 02:35:18,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 02:35:18" (3/3) ... [2019-10-03 02:35:18,429 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2019-10-03 02:35:18,440 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-03 02:35:18,449 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-03 02:35:18,469 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-03 02:35:18,502 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-10-03 02:35:18,502 INFO L378 AbstractCegarLoop]: Hoare is false [2019-10-03 02:35:18,502 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-03 02:35:18,502 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-03 02:35:18,503 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-03 02:35:18,503 INFO L382 AbstractCegarLoop]: Difference is false [2019-10-03 02:35:18,503 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-03 02:35:18,503 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-03 02:35:18,523 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-03 02:35:18,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-03 02:35:18,537 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:18,539 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:18,542 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:18,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:18,550 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2019-10-03 02:35:18,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:18,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:18,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,605 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:18,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:18,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:18,665 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-03 02:35:18,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-03 02:35:18,665 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-10-03 02:35:18,670 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-03 02:35:18,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-03 02:35:18,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-03 02:35:18,691 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2019-10-03 02:35:18,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:18,710 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2019-10-03 02:35:18,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-03 02:35:18,711 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-10-03 02:35:18,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:18,722 INFO L225 Difference]: With dead ends: 19 [2019-10-03 02:35:18,722 INFO L226 Difference]: Without dead ends: 13 [2019-10-03 02:35:18,725 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-03 02:35:18,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-10-03 02:35:18,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-10-03 02:35:18,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-03 02:35:18,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-10-03 02:35:18,766 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-10-03 02:35:18,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:18,767 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-10-03 02:35:18,767 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-03 02:35:18,767 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-10-03 02:35:18,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-03 02:35:18,768 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:18,768 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:18,769 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:18,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:18,769 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2019-10-03 02:35:18,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:18,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:18,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,778 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:18,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:18,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:18,847 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-03 02:35:18,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-03 02:35:18,847 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-10-03 02:35:18,849 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-03 02:35:18,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-03 02:35:18,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-03 02:35:18,851 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2019-10-03 02:35:18,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:18,945 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2019-10-03 02:35:18,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-03 02:35:18,945 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-10-03 02:35:18,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:18,946 INFO L225 Difference]: With dead ends: 16 [2019-10-03 02:35:18,947 INFO L226 Difference]: Without dead ends: 16 [2019-10-03 02:35:18,954 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-03 02:35:18,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-03 02:35:18,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-10-03 02:35:18,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-03 02:35:18,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-10-03 02:35:18,965 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2019-10-03 02:35:18,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:18,966 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-10-03 02:35:18,966 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-03 02:35:18,966 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-10-03 02:35:18,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-03 02:35:18,967 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:18,967 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:18,970 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:18,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:18,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2019-10-03 02:35:18,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:18,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:18,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:18,976 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:18,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:19,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:19,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:19,026 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:35:19,027 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2019-10-03 02:35:19,029 INFO L207 CegarAbsIntRunner]: [0], [4], [10], [12], [15], [19], [25], [28], [30], [36], [37], [38], [40] [2019-10-03 02:35:19,069 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-03 02:35:19,069 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-03 02:35:19,176 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-03 02:35:19,179 INFO L272 AbstractInterpreter]: Visited 9 different actions 33 times. Merged at 3 different actions 18 times. Widened at 1 different actions 2 times. Performed 74 root evaluator evaluations with a maximum evaluation depth of 3. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-10-03 02:35:19,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:19,183 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-03 02:35:19,224 INFO L219 lantSequenceWeakener]: Could never weaken! [2019-10-03 02:35:19,224 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-10-03 02:35:19,235 INFO L420 sIntCurrentIteration]: We unified 12 AI predicates to 12 [2019-10-03 02:35:19,235 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-03 02:35:19,237 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-03 02:35:19,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2019-10-03 02:35:19,237 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-10-03 02:35:19,238 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-03 02:35:19,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-03 02:35:19,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-03 02:35:19,239 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2019-10-03 02:35:19,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:19,314 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2019-10-03 02:35:19,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-03 02:35:19,314 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-03 02:35:19,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:19,315 INFO L225 Difference]: With dead ends: 19 [2019-10-03 02:35:19,316 INFO L226 Difference]: Without dead ends: 19 [2019-10-03 02:35:19,316 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-03 02:35:19,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-03 02:35:19,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-10-03 02:35:19,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-03 02:35:19,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-03 02:35:19,321 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-03 02:35:19,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:19,322 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-03 02:35:19,322 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-03 02:35:19,322 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-03 02:35:19,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-03 02:35:19,323 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:19,323 INFO L411 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:19,324 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:19,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:19,324 INFO L82 PathProgramCache]: Analyzing trace with hash 57842105, now seen corresponding path program 1 times [2019-10-03 02:35:19,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:19,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:19,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,327 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:19,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:19,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:19,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:19,388 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:35:19,388 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2019-10-03 02:35:19,389 INFO L207 CegarAbsIntRunner]: [0], [4], [10], [12], [15], [17], [19], [25], [28], [30], [36], [37], [38], [40] [2019-10-03 02:35:19,391 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-03 02:35:19,391 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-03 02:35:19,464 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-03 02:35:19,465 INFO L272 AbstractInterpreter]: Visited 14 different actions 52 times. Merged at 4 different actions 24 times. Widened at 1 different actions 2 times. Performed 115 root evaluator evaluations with a maximum evaluation depth of 5. Performed 115 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 6 fixpoints after 2 different actions. Largest state had 3 variables. [2019-10-03 02:35:19,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:19,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-03 02:35:19,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:19,467 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) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-03 02:35:19,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:19,489 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-10-03 02:35:19,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:19,507 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-03 02:35:19,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:35:19,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:19,540 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:35:19,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:19,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:35:19,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2019-10-03 02:35:19,583 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:35:19,584 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-03 02:35:19,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-03 02:35:19,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-03 02:35:19,585 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2019-10-03 02:35:19,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:19,623 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2019-10-03 02:35:19,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-03 02:35:19,624 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-03 02:35:19,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:19,625 INFO L225 Difference]: With dead ends: 22 [2019-10-03 02:35:19,625 INFO L226 Difference]: Without dead ends: 22 [2019-10-03 02:35:19,625 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-03 02:35:19,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-03 02:35:19,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-10-03 02:35:19,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-03 02:35:19,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-03 02:35:19,630 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2019-10-03 02:35:19,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:19,630 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-03 02:35:19,630 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-03 02:35:19,631 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-03 02:35:19,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-03 02:35:19,631 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:19,631 INFO L411 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:19,632 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:19,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:19,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1350121109, now seen corresponding path program 2 times [2019-10-03 02:35:19,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:19,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:35:19,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,634 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:19,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:19,709 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:19,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:19,710 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:35:19,710 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:35:19,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:35:19,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:19,711 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 [2019-10-03 02:35:19,732 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-03 02:35:19,733 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-10-03 02:35:19,757 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-03 02:35:19,758 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-03 02:35:19,759 INFO L256 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-03 02:35:19,761 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:35:19,797 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-03 02:35:19,798 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:35:19,867 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-03 02:35:19,872 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:35:19,872 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2019-10-03 02:35:19,872 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:35:19,873 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-03 02:35:19,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-03 02:35:19,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-03 02:35:19,874 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2019-10-03 02:35:19,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:19,938 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2019-10-03 02:35:19,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-03 02:35:19,938 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-10-03 02:35:19,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:19,940 INFO L225 Difference]: With dead ends: 31 [2019-10-03 02:35:19,940 INFO L226 Difference]: Without dead ends: 31 [2019-10-03 02:35:19,941 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-03 02:35:19,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-03 02:35:19,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2019-10-03 02:35:19,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-03 02:35:19,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-03 02:35:19,946 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2019-10-03 02:35:19,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:19,947 INFO L475 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-03 02:35:19,947 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-03 02:35:19,947 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-03 02:35:19,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-03 02:35:19,948 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:19,948 INFO L411 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:19,949 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:19,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:19,949 INFO L82 PathProgramCache]: Analyzing trace with hash -2146400685, now seen corresponding path program 3 times [2019-10-03 02:35:19,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:19,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-03 02:35:19,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:19,952 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:19,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:35:20,081 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:20,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:20,082 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:35:20,082 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:35:20,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:35:20,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:35:20,082 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 [2019-10-03 02:35:20,107 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-03 02:35:20,107 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-10-03 02:35:20,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-03 02:35:20,121 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-03 02:35:20,121 INFO L256 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-03 02:35:20,123 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:35:20,175 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:20,175 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:35:20,235 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:35:20,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:35:20,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2019-10-03 02:35:20,240 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:35:20,241 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-03 02:35:20,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-03 02:35:20,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-03 02:35:20,242 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 10 states. [2019-10-03 02:35:20,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:35:20,313 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-10-03 02:35:20,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-03 02:35:20,314 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2019-10-03 02:35:20,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:35:20,317 INFO L225 Difference]: With dead ends: 35 [2019-10-03 02:35:20,317 INFO L226 Difference]: Without dead ends: 35 [2019-10-03 02:35:20,318 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-03 02:35:20,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-03 02:35:20,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-10-03 02:35:20,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-03 02:35:20,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2019-10-03 02:35:20,324 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 25 [2019-10-03 02:35:20,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:35:20,324 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2019-10-03 02:35:20,324 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-03 02:35:20,324 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2019-10-03 02:35:20,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-03 02:35:20,326 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:35:20,326 INFO L411 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:35:20,326 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:35:20,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:35:20,326 INFO L82 PathProgramCache]: Analyzing trace with hash 749989817, now seen corresponding path program 4 times [2019-10-03 02:35:20,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:35:20,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:20,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-03 02:35:20,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:35:20,328 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:35:20,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-03 02:35:20,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-03 02:35:20,376 INFO L478 BasicCegarLoop]: Counterexample might be feasible [2019-10-03 02:35:20,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.10 02:35:20 BoogieIcfgContainer [2019-10-03 02:35:20,400 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-03 02:35:20,403 INFO L168 Benchmark]: Toolchain (without parser) took 2762.47 ms. Allocated memory was 132.6 MB in the beginning and 224.4 MB in the end (delta: 91.8 MB). Free memory was 88.9 MB in the beginning and 158.9 MB in the end (delta: -70.0 MB). Peak memory consumption was 21.8 MB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,404 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 132.6 MB. Free memory was 106.8 MB in the beginning and 106.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,405 INFO L168 Benchmark]: CACSL2BoogieTranslator took 336.77 ms. Allocated memory is still 132.6 MB. Free memory was 88.7 MB in the beginning and 79.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,406 INFO L168 Benchmark]: Boogie Preprocessor took 142.09 ms. Allocated memory was 132.6 MB in the beginning and 200.8 MB in the end (delta: 68.2 MB). Free memory was 79.6 MB in the beginning and 178.3 MB in the end (delta: -98.8 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,407 INFO L168 Benchmark]: RCFGBuilder took 298.64 ms. Allocated memory is still 200.8 MB. Free memory was 178.3 MB in the beginning and 166.5 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,408 INFO L168 Benchmark]: TraceAbstraction took 1979.41 ms. Allocated memory was 200.8 MB in the beginning and 224.4 MB in the end (delta: 23.6 MB). Free memory was 166.5 MB in the beginning and 158.9 MB in the end (delta: 7.6 MB). Peak memory consumption was 31.2 MB. Max. memory is 7.1 GB. [2019-10-03 02:35:20,412 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 132.6 MB. Free memory was 106.8 MB in the beginning and 106.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 336.77 ms. Allocated memory is still 132.6 MB. Free memory was 88.7 MB in the beginning and 79.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 142.09 ms. Allocated memory was 132.6 MB in the beginning and 200.8 MB in the end (delta: 68.2 MB). Free memory was 79.6 MB in the beginning and 178.3 MB in the end (delta: -98.8 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 298.64 ms. Allocated memory is still 200.8 MB. Free memory was 178.3 MB in the beginning and 166.5 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1979.41 ms. Allocated memory was 200.8 MB in the beginning and 224.4 MB in the end (delta: 23.6 MB). Free memory was 166.5 MB in the beginning and 158.9 MB in the end (delta: 7.6 MB). Peak memory consumption was 31.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, sn=0; [L13] i=1 VAL [i=1, sn=0] [L13] COND TRUE i<=8 VAL [i=1, sn=0] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=1, sn=2] [L13] i++ VAL [i=2, sn=2] [L13] COND TRUE i<=8 VAL [i=2, sn=2] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=2, sn=4] [L13] i++ VAL [i=3, sn=4] [L13] COND TRUE i<=8 VAL [i=3, sn=4] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=3, sn=6] [L13] i++ VAL [i=4, sn=6] [L13] COND TRUE i<=8 VAL [i=4, sn=6] [L14] COND FALSE !(i<4) VAL [i=4, sn=6] [L13] i++ VAL [i=5, sn=6] [L13] COND TRUE i<=8 VAL [i=5, sn=6] [L14] COND FALSE !(i<4) VAL [i=5, sn=6] [L13] i++ VAL [i=6, sn=6] [L13] COND TRUE i<=8 VAL [i=6, sn=6] [L14] COND FALSE !(i<4) VAL [i=6, sn=6] [L13] i++ VAL [i=7, sn=6] [L13] COND TRUE i<=8 VAL [i=7, sn=6] [L14] COND FALSE !(i<4) VAL [i=7, sn=6] [L13] i++ VAL [i=8, sn=6] [L13] COND TRUE i<=8 VAL [i=8, sn=6] [L14] COND FALSE !(i<4) VAL [i=8, sn=6] [L13] i++ VAL [i=9, sn=6] [L13] COND FALSE !(i<=8) VAL [i=9, sn=6] [L17] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. UNSAFE Result, 1.9s OverallTime, 7 OverallIterations, 8 TraceHistogramMax, 0.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 72 SDtfs, 42 SDslu, 80 SDs, 0 SdLazy, 83 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 152 GetRequests, 122 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.9583333333333334 AbsIntWeakeningRatio, 0.4166666666666667 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 187 NumberOfCodeBlocks, 186 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 201 ConstructedInterpolants, 0 QuantifiedInterpolants, 7077 SizeOfPredicates, 4 NumberOfNonLiveVariables, 120 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 47/157 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...