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_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 20:51:25,766 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:51:25,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:51:25,779 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-03 20:51:25,789 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 20:51:25,790 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 20:51:25,790 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 20:51:25,792 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 20:51:25,792 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 20:51:25,793 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 20:51:25,795 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 20:51:25,797 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 20:51:25,798 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 20:51:25,799 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 20:51:25,800 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 20:51:25,801 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 20:51:25,803 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 20:51:25,806 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 20:51:25,807 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 20:51:25,807 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 20:51:25,808 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 20:51:25,809 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 20:51:25,809 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 20:51:25,810 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 20:51:25,810 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 20:51:25,811 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 20:51:25,811 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 20:51:25,812 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 20:51:25,813 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 [2019-09-03 20:51:25,827 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:51:25,828 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:51:25,828 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 20:51:25,828 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 20:51:25,829 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 20:51:25,829 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 20:51:25,829 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 20:51:25,829 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 20:51:25,830 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 20:51:25,830 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 20:51:25,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:51:25,831 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:51:25,832 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:51:25,832 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:51:25,832 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:51:25,832 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:51:25,832 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 20:51:25,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:51:25,833 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:51:25,833 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:51:25,833 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:51:25,833 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 20:51:25,834 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:51:25,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:51:25,834 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 20:51:25,861 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:51:25,874 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:51:25,877 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:51:25,878 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:51:25,879 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:51:25,879 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2019-09-03 20:51:25,941 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38cad791e/cfb35cf93150476bae9841ae0b023322/FLAGb0fb0079d [2019-09-03 20:51:26,371 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:51:26,371 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2019-09-03 20:51:26,377 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38cad791e/cfb35cf93150476bae9841ae0b023322/FLAGb0fb0079d [2019-09-03 20:51:26,774 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38cad791e/cfb35cf93150476bae9841ae0b023322 [2019-09-03 20:51:26,783 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:51:26,784 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:51:26,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:51:26,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:51:26,789 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:51:26,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:51:26" (1/1) ... [2019-09-03 20:51:26,792 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bb3b894 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:26, skipping insertion in model container [2019-09-03 20:51:26,793 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:51:26" (1/1) ... [2019-09-03 20:51:26,800 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:51:26,817 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:51:27,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:51:27,080 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:51:27,098 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:51:27,116 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:51:27,116 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27 WrapperNode [2019-09-03 20:51:27,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:51:27,117 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:51:27,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:51:27,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:51:27,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,270 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,275 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,276 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (1/1) ... [2019-09-03 20:51:27,278 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:51:27,278 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:51:27,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:51:27,278 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:51:27,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (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 [2019-09-03 20:51:27,345 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:51:27,346 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:51:27,346 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:51:27,347 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:51:27,347 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:51:27,347 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:51:27,347 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:51:27,347 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:51:27,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:51:27,530 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:51:27,530 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 20:51:27,532 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:51:27 BoogieIcfgContainer [2019-09-03 20:51:27,532 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:51:27,533 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:51:27,533 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:51:27,537 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:51:27,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:51:26" (1/3) ... [2019-09-03 20:51:27,538 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15c50bdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:51:27, skipping insertion in model container [2019-09-03 20:51:27,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:27" (2/3) ... [2019-09-03 20:51:27,538 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15c50bdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:51:27, skipping insertion in model container [2019-09-03 20:51:27,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:51:27" (3/3) ... [2019-09-03 20:51:27,540 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2019-09-03 20:51:27,548 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:51:27,553 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:51:27,569 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:51:27,595 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:51:27,596 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 20:51:27,596 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:51:27,596 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:51:27,596 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:51:27,596 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:51:27,597 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:51:27,597 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:51:27,611 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-03 20:51:27,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 20:51:27,621 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:27,622 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:27,626 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:27,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:27,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-03 20:51:27,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:27,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:27,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:27,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:27,678 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:27,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:27,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:27,832 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:51:27,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-03 20:51:27,833 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:51:27,836 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 20:51:27,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 20:51:27,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:51:27,850 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-09-03 20:51:27,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:27,884 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-03 20:51:27,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 20:51:27,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-03 20:51:27,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:27,896 INFO L225 Difference]: With dead ends: 18 [2019-09-03 20:51:27,896 INFO L226 Difference]: Without dead ends: 12 [2019-09-03 20:51:27,898 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:51:27,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-03 20:51:27,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-03 20:51:27,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-03 20:51:27,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-03 20:51:27,935 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-03 20:51:27,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:27,936 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-03 20:51:27,936 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 20:51:27,936 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-03 20:51:27,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 20:51:27,937 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:27,937 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:27,937 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:27,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:27,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-03 20:51:27,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:27,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:27,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:27,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:27,940 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:27,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,057 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:28,058 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-03 20:51:28,060 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-03 20:51:28,094 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 20:51:28,094 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 20:51:28,153 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-03 20:51:28,210 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 20:51:28,213 INFO L272 AbstractInterpreter]: Visited 11 different actions 41 times. Merged at 2 different actions 10 times. Widened at 1 different actions 3 times. Performed 74 root evaluator evaluations with a maximum evaluation depth of 5. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-03 20:51:28,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:28,217 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 20:51:28,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,218 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 [2019-09-03 20:51:28,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:28,235 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:51:28,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:28,252 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 20:51:28,258 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:28,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,295 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:28,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:28,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 10 [2019-09-03 20:51:28,444 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:28,445 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:51:28,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:51:28,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-09-03 20:51:28,446 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2019-09-03 20:51:28,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:28,476 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-03 20:51:28,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-03 20:51:28,478 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-09-03 20:51:28,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:28,479 INFO L225 Difference]: With dead ends: 13 [2019-09-03 20:51:28,479 INFO L226 Difference]: Without dead ends: 13 [2019-09-03 20:51:28,482 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-09-03 20:51:28,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-03 20:51:28,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-03 20:51:28,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-03 20:51:28,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-03 20:51:28,486 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-03 20:51:28,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:28,487 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-03 20:51:28,487 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:51:28,488 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-03 20:51:28,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-03 20:51:28,488 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:28,488 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:28,489 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:28,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:28,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-03 20:51:28,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:28,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:28,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:28,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:28,492 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:28,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:28,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,576 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:28,576 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:28,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:28,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,576 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 [2019-09-03 20:51:28,590 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:51:28,591 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:51:28,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-03 20:51:28,603 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:28,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 20:51:28,606 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:28,626 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,627 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:28,756 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:28,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 12 [2019-09-03 20:51:28,761 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:28,761 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 20:51:28,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 20:51:28,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-09-03 20:51:28,762 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-03 20:51:28,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:28,790 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-03 20:51:28,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:51:28,790 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2019-09-03 20:51:28,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:28,791 INFO L225 Difference]: With dead ends: 14 [2019-09-03 20:51:28,791 INFO L226 Difference]: Without dead ends: 14 [2019-09-03 20:51:28,792 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-09-03 20:51:28,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-03 20:51:28,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-03 20:51:28,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 20:51:28,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-03 20:51:28,795 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-03 20:51:28,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:28,796 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-03 20:51:28,796 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 20:51:28,796 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-03 20:51:28,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 20:51:28,797 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:28,797 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:28,797 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:28,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:28,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-03 20:51:28,798 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:28,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:28,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:51:28,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:28,800 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:28,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:28,915 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,928 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:28,928 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:28,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:28,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:28,929 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 [2019-09-03 20:51:28,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:51:28,945 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:51:28,956 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:51:28,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:28,957 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 20:51:28,959 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:28,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:28,983 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:29,131 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:29,134 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:29,134 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 14 [2019-09-03 20:51:29,135 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:29,135 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-03 20:51:29,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-03 20:51:29,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2019-09-03 20:51:29,136 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2019-09-03 20:51:29,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:29,177 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-03 20:51:29,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:51:29,178 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-09-03 20:51:29,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:29,178 INFO L225 Difference]: With dead ends: 15 [2019-09-03 20:51:29,179 INFO L226 Difference]: Without dead ends: 15 [2019-09-03 20:51:29,179 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2019-09-03 20:51:29,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-03 20:51:29,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-03 20:51:29,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 20:51:29,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-03 20:51:29,182 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-03 20:51:29,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:29,183 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-03 20:51:29,183 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-03 20:51:29,183 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-03 20:51:29,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 20:51:29,184 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:29,184 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:29,184 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:29,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:29,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-03 20:51:29,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:29,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:29,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:51:29,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:29,186 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:29,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:29,286 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:29,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:29,286 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:29,286 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:29,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:29,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:29,287 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 [2019-09-03 20:51:29,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:29,298 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:51:29,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:29,313 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-03 20:51:29,315 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:29,342 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:29,343 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:29,515 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:29,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:29,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 10] total 16 [2019-09-03 20:51:29,523 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:29,523 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-03 20:51:29,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-03 20:51:29,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:51:29,525 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2019-09-03 20:51:29,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:29,574 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-03 20:51:29,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 20:51:29,576 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-09-03 20:51:29,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:29,577 INFO L225 Difference]: With dead ends: 16 [2019-09-03 20:51:29,581 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 20:51:29,582 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:51:29,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 20:51:29,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-03 20:51:29,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-03 20:51:29,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-03 20:51:29,588 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-03 20:51:29,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:29,588 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-03 20:51:29,588 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-03 20:51:29,589 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-03 20:51:29,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-03 20:51:29,589 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:29,589 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:29,590 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:29,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:29,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-03 20:51:29,592 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:29,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:29,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:29,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:29,594 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:29,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:29,724 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:29,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:29,725 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:29,725 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:29,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:29,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:29,725 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 [2019-09-03 20:51:29,746 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:51:29,746 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:51:29,757 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-03 20:51:29,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:29,758 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-03 20:51:29,759 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:29,818 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:29,852 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-03 20:51:29,852 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:29,959 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-03 20:51:29,963 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-09-03 20:51:29,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [8] total 15 [2019-09-03 20:51:29,963 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:51:29,963 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 20:51:29,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 20:51:29,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:51:29,965 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 6 states. [2019-09-03 20:51:30,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:30,005 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-03 20:51:30,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:51:30,005 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-09-03 20:51:30,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:30,005 INFO L225 Difference]: With dead ends: 14 [2019-09-03 20:51:30,006 INFO L226 Difference]: Without dead ends: 0 [2019-09-03 20:51:30,006 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:51:30,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-03 20:51:30,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-03 20:51:30,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-03 20:51:30,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-03 20:51:30,007 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2019-09-03 20:51:30,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:30,008 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-03 20:51:30,008 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 20:51:30,008 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-03 20:51:30,008 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-03 20:51:30,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.09 08:51:30 BoogieIcfgContainer [2019-09-03 20:51:30,013 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-03 20:51:30,016 INFO L168 Benchmark]: Toolchain (without parser) took 3230.99 ms. Allocated memory was 140.0 MB in the beginning and 226.5 MB in the end (delta: 86.5 MB). Free memory was 87.6 MB in the beginning and 87.4 MB in the end (delta: 144.6 kB). Peak memory consumption was 86.7 MB. Max. memory is 7.1 GB. [2019-09-03 20:51:30,017 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-09-03 20:51:30,018 INFO L168 Benchmark]: CACSL2BoogieTranslator took 332.03 ms. Allocated memory is still 140.0 MB. Free memory was 87.6 MB in the beginning and 78.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2019-09-03 20:51:30,019 INFO L168 Benchmark]: Boogie Preprocessor took 160.31 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 78.5 MB in the beginning and 180.7 MB in the end (delta: -102.2 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2019-09-03 20:51:30,020 INFO L168 Benchmark]: RCFGBuilder took 254.26 ms. Allocated memory is still 202.4 MB. Free memory was 179.8 MB in the beginning and 169.6 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2019-09-03 20:51:30,021 INFO L168 Benchmark]: TraceAbstraction took 2480.47 ms. Allocated memory was 202.4 MB in the beginning and 226.5 MB in the end (delta: 24.1 MB). Free memory was 168.7 MB in the beginning and 87.4 MB in the end (delta: 81.3 MB). Peak memory consumption was 105.4 MB. Max. memory is 7.1 GB. [2019-09-03 20:51:30,024 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 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 332.03 ms. Allocated memory is still 140.0 MB. Free memory was 87.6 MB in the beginning and 78.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 160.31 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 78.5 MB in the beginning and 180.7 MB in the end (delta: -102.2 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 254.26 ms. Allocated memory is still 202.4 MB. Free memory was 179.8 MB in the beginning and 169.6 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2480.47 ms. Allocated memory was 202.4 MB in the beginning and 226.5 MB in the end (delta: 24.1 MB). Free memory was 168.7 MB in the beginning and 87.4 MB in the end (delta: 81.3 MB). Peak memory consumption was 105.4 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, 2.4s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 63 SDtfs, 2 SDslu, 144 SDs, 0 SdLazy, 96 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 165 GetRequests, 91 SyntacticMatches, 15 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 140 NumberOfCodeBlocks, 137 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 8389 SizeOfPredicates, 3 NumberOfNonLiveVariables, 180 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 16 InterpolantComputations, 3 PerfectInterpolantSequences, 30/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...