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/nla-digbench/prod4br.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:26:24,041 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:26:24,043 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:26:24,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-20 13:26:24,064 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 13:26:24,065 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 13:26:24,066 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 13:26:24,068 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 13:26:24,068 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 13:26:24,069 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 13:26:24,072 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 13:26:24,074 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 13:26:24,076 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 13:26:24,077 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 13:26:24,078 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 13:26:24,079 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 13:26:24,082 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-20 13:26:24,091 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:26:24,092 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:26:24,093 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:26:24,094 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 [2019-09-20 13:26:24,110 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:26:24,110 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:26:24,111 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:26:24,111 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:26:24,112 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:26:24,112 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:26:24,114 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:26:24,114 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:26:24,115 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:26:24,115 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:26:24,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:26:24,116 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:26:24,116 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:26:24,116 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:26:24,116 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:26:24,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:26:24,117 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:26:24,117 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:26:24,118 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:26:24,118 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:26:24,119 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:26:24,119 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:26:24,119 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:26:24,119 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:26:24,120 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:26:24,120 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:26:24,120 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:26:24,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:26:24,121 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:26:24,121 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:26:24,172 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:26:24,189 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:26:24,194 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:26:24,196 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:26:24,196 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:26:24,197 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/prod4br.c [2019-09-20 13:26:24,267 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47c357886/1dc370aa7aab40a89efe2aa319f99e24/FLAGf9dbefb9f [2019-09-20 13:26:24,708 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:26:24,709 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/prod4br.c [2019-09-20 13:26:24,716 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47c357886/1dc370aa7aab40a89efe2aa319f99e24/FLAGf9dbefb9f [2019-09-20 13:26:25,087 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47c357886/1dc370aa7aab40a89efe2aa319f99e24 [2019-09-20 13:26:25,097 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:26:25,098 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:26:25,099 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:26:25,100 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:26:25,106 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:26:25,107 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,110 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4967b437 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25, skipping insertion in model container [2019-09-20 13:26:25,110 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,118 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:26:25,136 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:26:25,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:26:25,352 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:26:25,385 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:26:25,399 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:26:25,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25 WrapperNode [2019-09-20 13:26:25,400 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:26:25,400 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:26:25,400 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:26:25,401 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:26:25,498 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,498 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,504 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,514 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,515 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (1/1) ... [2019-09-20 13:26:25,517 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:26:25,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:26:25,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:26:25,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:26:25,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (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 [2019-09-20 13:26:25,574 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:26:25,574 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:26:25,574 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:26:25,574 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:26:25,574 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:26:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:26:25,779 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:26:25,779 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-20 13:26:25,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:25 BoogieIcfgContainer [2019-09-20 13:26:25,781 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:26:25,782 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:26:25,782 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:26:25,785 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:26:25,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:26:25" (1/3) ... [2019-09-20 13:26:25,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@222604da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:25, skipping insertion in model container [2019-09-20 13:26:25,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:25" (2/3) ... [2019-09-20 13:26:25,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@222604da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:25, skipping insertion in model container [2019-09-20 13:26:25,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:25" (3/3) ... [2019-09-20 13:26:25,788 INFO L109 eAbstractionObserver]: Analyzing ICFG prod4br.c [2019-09-20 13:26:25,797 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:26:25,805 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:26:25,821 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:26:25,846 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:26:25,847 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:26:25,847 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:26:25,847 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:26:25,847 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:26:25,847 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:26:25,848 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:26:25,848 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:26:25,862 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-09-20 13:26:25,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 13:26:25,872 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:25,873 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:25,875 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:25,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:25,880 INFO L82 PathProgramCache]: Analyzing trace with hash 152624894, now seen corresponding path program 1 times [2019-09-20 13:26:25,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:25,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:25,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:25,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:25,923 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:25,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:25,987 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:25,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-20 13:26:25,988 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:25,991 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-20 13:26:26,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-20 13:26:26,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-20 13:26:26,005 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 2 states. [2019-09-20 13:26:26,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:26,025 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2019-09-20 13:26:26,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-20 13:26:26,026 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-20 13:26:26,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:26,036 INFO L225 Difference]: With dead ends: 24 [2019-09-20 13:26:26,036 INFO L226 Difference]: Without dead ends: 19 [2019-09-20 13:26:26,038 INFO L636 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 [2019-09-20 13:26:26,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-20 13:26:26,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-09-20 13:26:26,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-20 13:26:26,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2019-09-20 13:26:26,080 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2019-09-20 13:26:26,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:26,081 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2019-09-20 13:26:26,081 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-20 13:26:26,081 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2019-09-20 13:26:26,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 13:26:26,083 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:26,083 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:26,083 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:26,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:26,084 INFO L82 PathProgramCache]: Analyzing trace with hash 130400808, now seen corresponding path program 1 times [2019-09-20 13:26:26,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:26,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:26,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:26,086 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:26,093 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:26,093 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:26,094 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_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 (exit command is (exit), workingDir is null) [2019-09-20 13:26:26,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,119 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:26,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:26,139 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because the path program does not contain any loops [2019-09-20 13:26:26,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:26,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:26,140 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 [2019-09-20 13:26:26,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,211 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:26,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:26,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-20 13:26:26,261 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:26,330 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:26,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:26,398 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:26,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:26,479 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:26,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-09-20 13:26:26,480 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:26,481 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-20 13:26:26,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-20 13:26:26,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-20 13:26:26,482 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 5 states. [2019-09-20 13:26:26,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:26,628 INFO L93 Difference]: Finished difference Result 31 states and 41 transitions. [2019-09-20 13:26:26,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-20 13:26:26,629 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-20 13:26:26,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:26,630 INFO L225 Difference]: With dead ends: 31 [2019-09-20 13:26:26,630 INFO L226 Difference]: Without dead ends: 31 [2019-09-20 13:26:26,631 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-09-20 13:26:26,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-20 13:26:26,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2019-09-20 13:26:26,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-09-20 13:26:26,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2019-09-20 13:26:26,640 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 10 [2019-09-20 13:26:26,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:26,640 INFO L475 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2019-09-20 13:26:26,643 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-20 13:26:26,643 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2019-09-20 13:26:26,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-20 13:26:26,644 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:26,644 INFO L407 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:26,645 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:26,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:26,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1836845457, now seen corresponding path program 1 times [2019-09-20 13:26:26,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:26,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:26,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:26,648 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:26,653 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:26,653 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:26,653 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_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 (exit command is (exit), workingDir is null) [2019-09-20 13:26:26,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,674 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:26,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:26,689 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2019-09-20 13:26:26,691 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [17], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59], [60] [2019-09-20 13:26:26,725 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:26,725 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:26,845 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:26,846 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 27 root evaluator evaluations with a maximum evaluation depth of 8. Performed 27 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 8 variables. [2019-09-20 13:26:26,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:26,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:26,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:26,850 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 [2019-09-20 13:26:26,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:26,884 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:26,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:26,906 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 14 conjunts are in the unsatisfiable core [2019-09-20 13:26:26,909 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:26,975 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,010 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:27,043 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:27,147 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,149 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,150 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,153 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,169 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:27,205 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:27,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 13:26:27,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2019-09-20 13:26:27,209 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:27,209 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 13:26:27,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 13:26:27,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:26:27,210 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 13 states. [2019-09-20 13:26:28,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:28,315 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2019-09-20 13:26:28,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 13:26:28,316 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 16 [2019-09-20 13:26:28,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:28,319 INFO L225 Difference]: With dead ends: 39 [2019-09-20 13:26:28,319 INFO L226 Difference]: Without dead ends: 39 [2019-09-20 13:26:28,320 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2019-09-20 13:26:28,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-09-20 13:26:28,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2019-09-20 13:26:28,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-20 13:26:28,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-09-20 13:26:28,327 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2019-09-20 13:26:28,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:28,327 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-09-20 13:26:28,327 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 13:26:28,327 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-09-20 13:26:28,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-20 13:26:28,328 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:28,329 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:28,329 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:28,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:28,329 INFO L82 PathProgramCache]: Analyzing trace with hash 682822634, now seen corresponding path program 1 times [2019-09-20 13:26:28,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:28,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:28,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:28,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:28,331 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:28,336 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:28,336 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:28,336 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:28,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:28,365 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-20 13:26:28,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:28,378 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2019-09-20 13:26:28,378 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [19], [22], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59] [2019-09-20 13:26:28,382 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:28,382 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:28,416 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:26:28,750 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:28,759 INFO L272 AbstractInterpreter]: Visited 15 different actions 75 times. Merged at 4 different actions 24 times. Widened at 1 different actions 2 times. Performed 136 root evaluator evaluations with a maximum evaluation depth of 9. Performed 136 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-09-20 13:26:28,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:28,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:28,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:28,760 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:28,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:28,786 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:28,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:28,817 WARN L254 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-20 13:26:28,819 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:29,031 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 25 [2019-09-20 13:26:29,039 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,072 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:29,073 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:29,112 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,113 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,118 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,281 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,292 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:29,332 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:29,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 13:26:29,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2019-09-20 13:26:29,336 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:29,336 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 13:26:29,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 13:26:29,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:26:29,337 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 13 states. [2019-09-20 13:26:29,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:29,772 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2019-09-20 13:26:29,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:26:29,773 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 18 [2019-09-20 13:26:29,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:29,774 INFO L225 Difference]: With dead ends: 49 [2019-09-20 13:26:29,774 INFO L226 Difference]: Without dead ends: 49 [2019-09-20 13:26:29,775 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2019-09-20 13:26:29,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-20 13:26:29,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2019-09-20 13:26:29,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-20 13:26:29,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2019-09-20 13:26:29,782 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 18 [2019-09-20 13:26:29,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:29,783 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2019-09-20 13:26:29,783 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 13:26:29,783 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2019-09-20 13:26:29,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-20 13:26:29,784 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:29,784 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:29,784 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:29,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:29,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1827366173, now seen corresponding path program 1 times [2019-09-20 13:26:29,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:29,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:29,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:29,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:29,787 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:29,791 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:29,791 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:29,791 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:29,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:29,826 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-20 13:26:29,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:29,839 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2019-09-20 13:26:29,840 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [19], [24], [27], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59] [2019-09-20 13:26:29,844 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:29,844 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:29,877 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:26:30,084 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:30,085 INFO L272 AbstractInterpreter]: Visited 16 different actions 71 times. Merged at 5 different actions 25 times. Widened at 1 different actions 1 times. Performed 110 root evaluator evaluations with a maximum evaluation depth of 12. Performed 110 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-09-20 13:26:30,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:30,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:30,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:30,086 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:30,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:30,108 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:30,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:30,125 WARN L254 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-20 13:26:30,126 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:30,777 WARN L191 SmtUtils]: Spent 569.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 31 [2019-09-20 13:26:30,787 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:30,815 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:30,815 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:31,001 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:31,007 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:31,030 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:31,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 13:26:31,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2019-09-20 13:26:31,034 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:31,034 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 13:26:31,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 13:26:31,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:26:31,035 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand 13 states. [2019-09-20 13:26:31,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:31,411 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2019-09-20 13:26:31,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:26:31,412 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 19 [2019-09-20 13:26:31,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:31,413 INFO L225 Difference]: With dead ends: 55 [2019-09-20 13:26:31,413 INFO L226 Difference]: Without dead ends: 53 [2019-09-20 13:26:31,413 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2019-09-20 13:26:31,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-09-20 13:26:31,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 25. [2019-09-20 13:26:31,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-09-20 13:26:31,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-09-20 13:26:31,419 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2019-09-20 13:26:31,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:31,421 INFO L475 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-09-20 13:26:31,421 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 13:26:31,421 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-09-20 13:26:31,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-09-20 13:26:31,422 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:31,422 INFO L407 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:31,422 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:31,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:31,423 INFO L82 PathProgramCache]: Analyzing trace with hash 560958013, now seen corresponding path program 1 times [2019-09-20 13:26:31,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:31,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:31,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:31,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:31,425 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:31,429 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:31,429 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:31,429 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:31,449 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:31,450 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-20 13:26:31,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:31,467 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2019-09-20 13:26:31,467 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [17], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59], [60], [61], [62] [2019-09-20 13:26:31,469 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:31,470 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:31,485 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:31,485 INFO L272 AbstractInterpreter]: Visited 17 different actions 27 times. Never merged. Never widened. Performed 35 root evaluator evaluations with a maximum evaluation depth of 8. Performed 35 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 8 variables. [2019-09-20 13:26:31,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:31,486 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:31,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:31,486 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:31,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:31,513 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:31,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:31,523 INFO L256 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:26:31,525 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:31,572 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-20 13:26:31,573 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:31,599 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:31,607 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-20 13:26:31,611 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:31,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 9 [2019-09-20 13:26:31,611 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:31,612 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-20 13:26:31,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-20 13:26:31,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-20 13:26:31,613 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2019-09-20 13:26:31,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:31,684 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2019-09-20 13:26:31,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:26:31,685 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2019-09-20 13:26:31,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:31,686 INFO L225 Difference]: With dead ends: 35 [2019-09-20 13:26:31,686 INFO L226 Difference]: Without dead ends: 31 [2019-09-20 13:26:31,686 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2019-09-20 13:26:31,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-20 13:26:31,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-09-20 13:26:31,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-20 13:26:31,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2019-09-20 13:26:31,691 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 21 [2019-09-20 13:26:31,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:31,691 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2019-09-20 13:26:31,691 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-20 13:26:31,691 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2019-09-20 13:26:31,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-20 13:26:31,692 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:31,692 INFO L407 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:31,693 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:31,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:31,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1615173920, now seen corresponding path program 1 times [2019-09-20 13:26:31,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:31,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:31,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:31,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:31,695 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:31,700 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:31,700 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:31,700 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:31,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:31,729 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-20 13:26:31,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:31,741 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2019-09-20 13:26:31,742 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [17], [19], [24], [29], [32], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59], [60], [61], [62] [2019-09-20 13:26:31,746 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:31,747 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:31,775 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:26:32,559 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:32,560 INFO L272 AbstractInterpreter]: Visited 21 different actions 161 times. Merged at 8 different actions 40 times. Widened at 1 different actions 1 times. Performed 209 root evaluator evaluations with a maximum evaluation depth of 12. Performed 209 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-09-20 13:26:32,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:32,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:32,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:32,560 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:32,587 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:32,587 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:32,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:32,601 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:26:32,603 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:32,637 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-09-20 13:26:32,637 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:32,664 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:32,675 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-20 13:26:32,679 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:32,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 9 [2019-09-20 13:26:32,679 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:32,680 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-20 13:26:32,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-20 13:26:32,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-20 13:26:32,680 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 6 states. [2019-09-20 13:26:32,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:32,767 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2019-09-20 13:26:32,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:26:32,767 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2019-09-20 13:26:32,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:32,768 INFO L225 Difference]: With dead ends: 40 [2019-09-20 13:26:32,769 INFO L226 Difference]: Without dead ends: 36 [2019-09-20 13:26:32,770 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2019-09-20 13:26:32,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-20 13:26:32,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2019-09-20 13:26:32,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-09-20 13:26:32,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-09-20 13:26:32,778 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 31 [2019-09-20 13:26:32,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:32,779 INFO L475 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-09-20 13:26:32,779 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-20 13:26:32,779 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-09-20 13:26:32,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-20 13:26:32,781 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:32,781 INFO L407 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:32,781 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:32,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:32,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1091445474, now seen corresponding path program 1 times [2019-09-20 13:26:32,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:32,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:32,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:32,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:32,787 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:32,801 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-20 13:26:32,801 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-20 13:26:32,803 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-20 13:26:32,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:32,832 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-20 13:26:32,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:32,843 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2019-09-20 13:26:32,844 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [17], [19], [24], [29], [34], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59], [60], [61], [62] [2019-09-20 13:26:32,845 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:32,845 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:32,860 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:26:33,556 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:33,556 INFO L272 AbstractInterpreter]: Visited 21 different actions 161 times. Merged at 8 different actions 40 times. Widened at 1 different actions 1 times. Performed 246 root evaluator evaluations with a maximum evaluation depth of 12. Performed 246 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-09-20 13:26:33,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:33,556 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:33,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:33,557 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:33,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:33,582 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:33,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:33,595 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 13:26:33,597 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:33,624 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:33,638 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-09-20 13:26:33,638 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:33,671 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:26:33,687 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-20 13:26:33,690 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-20 13:26:33,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2019-09-20 13:26:33,691 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:33,691 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-20 13:26:33,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-20 13:26:33,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-09-20 13:26:33,692 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 5 states. [2019-09-20 13:26:33,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:33,776 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2019-09-20 13:26:33,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:26:33,776 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2019-09-20 13:26:33,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:33,777 INFO L225 Difference]: With dead ends: 31 [2019-09-20 13:26:33,777 INFO L226 Difference]: Without dead ends: 0 [2019-09-20 13:26:33,778 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2019-09-20 13:26:33,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-20 13:26:33,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-20 13:26:33,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-20 13:26:33,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-20 13:26:33,779 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2019-09-20 13:26:33,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:33,780 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-20 13:26:33,780 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-20 13:26:33,780 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-20 13:26:33,780 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-20 13:26:33,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.09 01:26:33 BoogieIcfgContainer [2019-09-20 13:26:33,786 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-20 13:26:33,787 INFO L168 Benchmark]: Toolchain (without parser) took 8689.31 ms. Allocated memory was 139.5 MB in the beginning and 359.1 MB in the end (delta: 219.7 MB). Free memory was 86.7 MB in the beginning and 105.4 MB in the end (delta: -18.7 MB). Peak memory consumption was 200.9 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,788 INFO L168 Benchmark]: CDTParser took 0.95 ms. Allocated memory is still 139.5 MB. Free memory was 105.4 MB in the beginning and 105.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,789 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.51 ms. Allocated memory is still 139.5 MB. Free memory was 86.4 MB in the beginning and 76.5 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,790 INFO L168 Benchmark]: Boogie Preprocessor took 116.45 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 76.5 MB in the beginning and 176.1 MB in the end (delta: -99.6 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,791 INFO L168 Benchmark]: RCFGBuilder took 263.83 ms. Allocated memory is still 199.2 MB. Free memory was 176.1 MB in the beginning and 162.4 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,792 INFO L168 Benchmark]: TraceAbstraction took 8003.91 ms. Allocated memory was 199.2 MB in the beginning and 359.1 MB in the end (delta: 159.9 MB). Free memory was 162.4 MB in the beginning and 105.4 MB in the end (delta: 57.0 MB). Peak memory consumption was 216.9 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:33,796 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.95 ms. Allocated memory is still 139.5 MB. Free memory was 105.4 MB in the beginning and 105.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 300.51 ms. Allocated memory is still 139.5 MB. Free memory was 86.4 MB in the beginning and 76.5 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.45 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 76.5 MB in the beginning and 176.1 MB in the end (delta: -99.6 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 263.83 ms. Allocated memory is still 199.2 MB. Free memory was 176.1 MB in the beginning and 162.4 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8003.91 ms. Allocated memory was 199.2 MB in the beginning and 359.1 MB in the end (delta: 159.9 MB). Free memory was 162.4 MB in the beginning and 105.4 MB in the end (delta: 57.0 MB). Peak memory consumption was 216.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 9]: 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, 24 locations, 1 error locations. SAFE Result, 7.9s OverallTime, 8 OverallIterations, 4 TraceHistogramMax, 2.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 151 SDtfs, 121 SDslu, 464 SDs, 0 SdLazy, 578 SolverSat, 56 SolverUnsat, 24 SolverUnknown, 0 SolverNotchecked, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 298 GetRequests, 220 SyntacticMatches, 6 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 2.3s AbstIntTime, 6 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 55 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 302 NumberOfCodeBlocks, 302 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 287 ConstructedInterpolants, 3 QuantifiedInterpolants, 22593 SizeOfPredicates, 33 NumberOfNonLiveVariables, 412 ConjunctsInSsa, 119 ConjunctsInUnsatCore, 15 InterpolantComputations, 8 PerfectInterpolantSequences, 107/120 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...