java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/zero_sum_const2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:30:58,819 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:30:58,826 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:30:58,844 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:30:58,844 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:30:58,846 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:30:58,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:30:58,857 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:30:58,860 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:30:58,861 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:30:58,863 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:30:58,864 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:30:58,865 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:30:58,868 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:30:58,871 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:30:58,872 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:30:58,874 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:30:58,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:30:58,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:30:58,882 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:30:58,886 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:30:58,889 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:30:58,891 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:30:58,892 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:30:58,895 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:30:58,906 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:30:58,907 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:30:58,908 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:30:58,909 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:30:58,946 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:30:58,946 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:30:58,951 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:30:58,951 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:30:58,951 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:30:58,951 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:30:58,952 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:30:58,952 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:30:58,952 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:30:58,952 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:30:58,952 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:30:58,953 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:30:58,954 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:30:58,954 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:30:58,955 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:30:58,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:30:58,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:30:58,955 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:30:58,956 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:30:59,247 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:30:59,265 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:30:59,268 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:30:59,270 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:30:59,271 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:30:59,272 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const2.c [2019-10-15 01:30:59,348 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/660e15870/235b683a08fe4a71b3daa71a07dca5ea/FLAG1dc1c6217 [2019-10-15 01:30:59,820 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:30:59,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const2.c [2019-10-15 01:30:59,827 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/660e15870/235b683a08fe4a71b3daa71a07dca5ea/FLAG1dc1c6217 [2019-10-15 01:31:00,204 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/660e15870/235b683a08fe4a71b3daa71a07dca5ea [2019-10-15 01:31:00,214 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:31:00,216 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:31:00,217 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:00,217 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:31:00,221 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:31:00,222 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,225 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37701bc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00, skipping insertion in model container [2019-10-15 01:31:00,226 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,235 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:31:00,255 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:31:00,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:00,472 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:31:00,490 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:00,506 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:31:00,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00 WrapperNode [2019-10-15 01:31:00,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:00,507 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:31:00,507 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:31:00,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:31:00,601 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,615 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,632 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,641 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,644 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,647 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:31:00,647 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:31:00,647 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:31:00,647 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:31:00,648 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:31:00,694 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:31:00,695 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:31:00,695 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:31:00,695 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:31:00,695 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:31:00,695 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:31:00,695 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:31:00,696 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-10-15 01:31:00,696 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:31:00,696 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:31:00,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:31:00,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:31:00,697 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:31:00,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:31:00,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:31:00,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:31:01,091 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:31:01,092 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-15 01:31:01,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:01 BoogieIcfgContainer [2019-10-15 01:31:01,093 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:31:01,094 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:31:01,095 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:31:01,098 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:31:01,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:31:00" (1/3) ... [2019-10-15 01:31:01,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68adc24e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:01, skipping insertion in model container [2019-10-15 01:31:01,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00" (2/3) ... [2019-10-15 01:31:01,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68adc24e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:01, skipping insertion in model container [2019-10-15 01:31:01,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:01" (3/3) ... [2019-10-15 01:31:01,101 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const2.c [2019-10-15 01:31:01,111 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:31:01,120 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:31:01,131 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:31:01,157 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:31:01,158 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:31:01,158 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:31:01,158 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:31:01,158 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:31:01,158 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:31:01,158 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:31:01,158 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:31:01,173 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:31:01,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:31:01,178 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:01,179 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:01,181 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:01,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:01,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1821330543, now seen corresponding path program 1 times [2019-10-15 01:31:01,192 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:01,192 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169560127] [2019-10-15 01:31:01,193 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,193 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,193 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:01,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:01,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:01,427 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169560127] [2019-10-15 01:31:01,428 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:01,429 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:31:01,429 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778858864] [2019-10-15 01:31:01,435 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:31:01,436 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:01,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:31:01,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:31:01,454 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2019-10-15 01:31:01,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:01,558 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-10-15 01:31:01,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:31:01,561 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-10-15 01:31:01,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:01,570 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:31:01,570 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:31:01,573 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:31:01,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:31:01,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:31:01,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:31:01,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2019-10-15 01:31:01,608 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 15 [2019-10-15 01:31:01,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:01,609 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2019-10-15 01:31:01,609 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:31:01,609 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2019-10-15 01:31:01,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:31:01,610 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:01,610 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:01,611 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:01,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:01,611 INFO L82 PathProgramCache]: Analyzing trace with hash 780224693, now seen corresponding path program 1 times [2019-10-15 01:31:01,612 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:01,612 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635256026] [2019-10-15 01:31:01,612 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,612 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,613 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:01,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:01,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:01,677 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635256026] [2019-10-15 01:31:01,677 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:01,678 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:01,678 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437766932] [2019-10-15 01:31:01,683 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:01,683 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:01,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:01,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:01,686 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand 3 states. [2019-10-15 01:31:01,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:01,729 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-10-15 01:31:01,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:01,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-15 01:31:01,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:01,732 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:31:01,732 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:31:01,735 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:01,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:31:01,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 01:31:01,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:31:01,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2019-10-15 01:31:01,746 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 16 [2019-10-15 01:31:01,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:01,746 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2019-10-15 01:31:01,746 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:01,747 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2019-10-15 01:31:01,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:31:01,749 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:01,749 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:01,749 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:01,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:01,751 INFO L82 PathProgramCache]: Analyzing trace with hash 2044161761, now seen corresponding path program 1 times [2019-10-15 01:31:01,752 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:01,752 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446978652] [2019-10-15 01:31:01,752 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,752 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:01,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:31:01,853 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446978652] [2019-10-15 01:31:01,853 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:01,854 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:31:01,854 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960123021] [2019-10-15 01:31:01,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:31:01,855 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:01,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:31:01,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:01,856 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand 4 states. [2019-10-15 01:31:01,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:01,905 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2019-10-15 01:31:01,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:31:01,906 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-15 01:31:01,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:01,907 INFO L225 Difference]: With dead ends: 32 [2019-10-15 01:31:01,907 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:31:01,907 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:01,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:31:01,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 01:31:01,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:31:01,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-15 01:31:01,914 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-10-15 01:31:01,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:01,914 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-15 01:31:01,914 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:31:01,914 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-15 01:31:01,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:31:01,915 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:01,915 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:01,916 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:01,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:01,916 INFO L82 PathProgramCache]: Analyzing trace with hash -791089743, now seen corresponding path program 1 times [2019-10-15 01:31:01,917 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:01,917 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735192381] [2019-10-15 01:31:01,917 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,917 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,917 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:01,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,008 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:02,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735192381] [2019-10-15 01:31:02,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978036700] [2019-10-15 01:31:02,009 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:02,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,091 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:02,099 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:02,160 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:02,161 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:02,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:02,200 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306094137] [2019-10-15 01:31:02,242 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:02,242 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:02,248 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:02,255 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:02,256 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:02,426 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:03,705 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:03,765 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:03,775 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:04,268 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:04,675 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:04,676 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:31:04,676 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950426771] [2019-10-15 01:31:04,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:31:04,678 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:04,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:31:04,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:31:04,680 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 18 states. [2019-10-15 01:31:05,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:05,294 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2019-10-15 01:31:05,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:05,295 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-10-15 01:31:05,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:05,296 INFO L225 Difference]: With dead ends: 35 [2019-10-15 01:31:05,296 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:31:05,297 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:31:05,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:31:05,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:31:05,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:31:05,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-10-15 01:31:05,307 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2019-10-15 01:31:05,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:05,308 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-10-15 01:31:05,308 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:31:05,308 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-10-15 01:31:05,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:31:05,309 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:05,310 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:05,510 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:05,511 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:05,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:05,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1692918307, now seen corresponding path program 2 times [2019-10-15 01:31:05,512 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:05,512 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758427215] [2019-10-15 01:31:05,512 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:05,512 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:05,512 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:05,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:05,592 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:05,593 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758427215] [2019-10-15 01:31:05,593 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874278727] [2019-10-15 01:31:05,594 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:05,658 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:31:05,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:05,659 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:05,666 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:05,699 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:05,700 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:05,722 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:05,723 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1627611695] [2019-10-15 01:31:05,724 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:05,725 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:05,725 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:05,726 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:05,726 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:05,777 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:06,513 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:06,554 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:06,559 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:07,301 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:07,301 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-10-15 01:31:07,301 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157046668] [2019-10-15 01:31:07,302 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:31:07,303 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:07,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:31:07,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:31:07,304 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 19 states. [2019-10-15 01:31:08,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:08,226 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-10-15 01:31:08,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:08,227 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2019-10-15 01:31:08,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:08,228 INFO L225 Difference]: With dead ends: 37 [2019-10-15 01:31:08,228 INFO L226 Difference]: Without dead ends: 26 [2019-10-15 01:31:08,230 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:31:08,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-15 01:31:08,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-15 01:31:08,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 01:31:08,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-10-15 01:31:08,237 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2019-10-15 01:31:08,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:08,237 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-10-15 01:31:08,238 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:31:08,238 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-10-15 01:31:08,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 01:31:08,239 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:08,239 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:08,442 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:08,443 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:08,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:08,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1878882833, now seen corresponding path program 3 times [2019-10-15 01:31:08,444 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:08,444 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118976906] [2019-10-15 01:31:08,445 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:08,445 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:08,445 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:08,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:09,261 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:09,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118976906] [2019-10-15 01:31:09,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774500075] [2019-10-15 01:31:09,262 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:09,331 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:09,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:09,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 45 conjunts are in the unsatisfiable core [2019-10-15 01:31:09,335 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:09,604 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:09,604 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:09,894 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:09,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1776464481] [2019-10-15 01:31:09,896 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:09,897 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:09,897 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:09,897 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:09,898 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:09,934 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:10,514 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:10,545 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:10,550 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:11,198 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:11,679 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:11,679 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13, 10, 11] total 45 [2019-10-15 01:31:11,680 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604919073] [2019-10-15 01:31:11,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-10-15 01:31:11,682 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:11,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-10-15 01:31:11,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1815, Unknown=0, NotChecked=0, Total=1980 [2019-10-15 01:31:11,684 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 45 states. [2019-10-15 01:31:13,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:13,377 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-10-15 01:31:13,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-15 01:31:13,378 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 25 [2019-10-15 01:31:13,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:13,379 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:31:13,379 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:31:13,380 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=288, Invalid=3134, Unknown=0, NotChecked=0, Total=3422 [2019-10-15 01:31:13,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:31:13,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-10-15 01:31:13,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 01:31:13,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-15 01:31:13,389 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2019-10-15 01:31:13,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:13,389 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-15 01:31:13,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-10-15 01:31:13,390 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-15 01:31:13,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:31:13,391 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:13,391 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:13,603 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:13,604 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:13,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:13,605 INFO L82 PathProgramCache]: Analyzing trace with hash -220862923, now seen corresponding path program 4 times [2019-10-15 01:31:13,605 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:13,606 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703873806] [2019-10-15 01:31:13,606 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:13,607 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:13,607 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:13,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:13,657 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:13,657 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703873806] [2019-10-15 01:31:13,658 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956328673] [2019-10-15 01:31:13,658 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:13,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:13,731 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:13,732 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:13,784 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:13,784 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:13,823 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:13,824 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849263700] [2019-10-15 01:31:13,825 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:13,826 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:13,826 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:13,827 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:13,827 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:13,860 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:14,354 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:14,383 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:14,387 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:14,851 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 27 [2019-10-15 01:31:15,275 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:15,276 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-10-15 01:31:15,276 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552799610] [2019-10-15 01:31:15,277 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:31:15,278 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:15,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:31:15,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:31:15,279 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 24 states. [2019-10-15 01:31:16,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:16,318 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2019-10-15 01:31:16,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:31:16,321 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-10-15 01:31:16,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:16,323 INFO L225 Difference]: With dead ends: 66 [2019-10-15 01:31:16,324 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 01:31:16,325 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:16,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 01:31:16,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2019-10-15 01:31:16,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:31:16,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-10-15 01:31:16,333 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2019-10-15 01:31:16,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:16,333 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-10-15 01:31:16,333 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:31:16,333 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-10-15 01:31:16,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 01:31:16,334 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:16,334 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:16,538 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:16,539 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:16,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:16,540 INFO L82 PathProgramCache]: Analyzing trace with hash 344147297, now seen corresponding path program 5 times [2019-10-15 01:31:16,540 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:16,541 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441012872] [2019-10-15 01:31:16,541 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:16,541 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:16,541 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:16,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:16,645 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:16,646 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441012872] [2019-10-15 01:31:16,646 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032909655] [2019-10-15 01:31:16,646 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-10-15 01:31:16,742 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:16,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:16,743 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:16,745 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:16,792 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:16,793 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:16,847 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:16,847 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368632346] [2019-10-15 01:31:16,849 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:16,849 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:16,849 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:16,849 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:16,850 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:16,878 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:17,378 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:17,419 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:17,425 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:18,221 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:18,221 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-10-15 01:31:18,222 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921079414] [2019-10-15 01:31:18,223 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-15 01:31:18,223 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:18,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-15 01:31:18,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:31:18,224 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 25 states. [2019-10-15 01:31:19,433 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 34 [2019-10-15 01:31:19,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:19,511 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-10-15 01:31:19,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:31:19,511 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 27 [2019-10-15 01:31:19,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:19,512 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:31:19,513 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:31:19,514 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:19,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:31:19,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-15 01:31:19,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 01:31:19,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-10-15 01:31:19,521 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2019-10-15 01:31:19,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:19,522 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-10-15 01:31:19,522 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-15 01:31:19,522 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-10-15 01:31:19,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:31:19,523 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:19,523 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:19,724 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:19,725 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:19,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:19,726 INFO L82 PathProgramCache]: Analyzing trace with hash 339030193, now seen corresponding path program 6 times [2019-10-15 01:31:19,726 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:19,726 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132999889] [2019-10-15 01:31:19,727 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,727 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,727 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:19,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:20,443 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 43 [2019-10-15 01:31:20,586 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2019-10-15 01:31:20,852 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 43 [2019-10-15 01:31:21,109 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2019-10-15 01:31:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:21,525 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132999889] [2019-10-15 01:31:21,525 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335511341] [2019-10-15 01:31:21,525 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:21,629 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:21,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:21,630 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 63 conjunts are in the unsatisfiable core [2019-10-15 01:31:21,633 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:22,109 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:22,109 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:22,536 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:22,536 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1346910904] [2019-10-15 01:31:22,537 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:22,538 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:22,538 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:22,538 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:22,538 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:22,572 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:23,245 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:23,288 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:23,293 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:24,476 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:24,476 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 12, 11] total 52 [2019-10-15 01:31:24,477 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107968323] [2019-10-15 01:31:24,478 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-10-15 01:31:24,478 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:24,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-10-15 01:31:24,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2476, Unknown=0, NotChecked=0, Total=2652 [2019-10-15 01:31:24,480 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 52 states. [2019-10-15 01:31:25,250 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 61 [2019-10-15 01:31:25,674 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 50 [2019-10-15 01:31:25,918 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 56 [2019-10-15 01:31:26,710 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 49 [2019-10-15 01:31:26,943 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 69 [2019-10-15 01:31:27,141 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 57 [2019-10-15 01:31:27,308 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 54 [2019-10-15 01:31:28,233 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 82 [2019-10-15 01:31:28,478 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 44 [2019-10-15 01:31:29,262 WARN L191 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 69 [2019-10-15 01:31:29,512 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 53 [2019-10-15 01:31:31,396 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2019-10-15 01:31:31,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:31,660 INFO L93 Difference]: Finished difference Result 79 states and 94 transitions. [2019-10-15 01:31:31,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-10-15 01:31:31,660 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 30 [2019-10-15 01:31:31,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:31,663 INFO L225 Difference]: With dead ends: 79 [2019-10-15 01:31:31,663 INFO L226 Difference]: Without dead ends: 71 [2019-10-15 01:31:31,665 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 53 SyntacticMatches, 11 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2462 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=797, Invalid=7945, Unknown=0, NotChecked=0, Total=8742 [2019-10-15 01:31:31,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-10-15 01:31:31,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 42. [2019-10-15 01:31:31,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-15 01:31:31,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2019-10-15 01:31:31,677 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 30 [2019-10-15 01:31:31,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:31,677 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2019-10-15 01:31:31,677 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-10-15 01:31:31,678 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2019-10-15 01:31:31,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-15 01:31:31,678 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:31,679 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:31,881 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:31,882 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:31,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:31,883 INFO L82 PathProgramCache]: Analyzing trace with hash -344141442, now seen corresponding path program 7 times [2019-10-15 01:31:31,883 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:31,883 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235108557] [2019-10-15 01:31:31,884 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:31,884 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:31,884 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:31,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:32,005 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:32,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235108557] [2019-10-15 01:31:32,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524915608] [2019-10-15 01:31:32,006 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-10-15 01:31:32,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:32,140 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:31:32,145 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:32,225 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:32,280 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:32,281 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080829866] [2019-10-15 01:31:32,282 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:32,282 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:32,283 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:32,283 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:32,285 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:32,315 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:32,779 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:32,803 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:32,806 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:33,284 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:33,680 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:33,680 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-10-15 01:31:33,680 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384010980] [2019-10-15 01:31:33,682 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-15 01:31:33,682 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:33,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-15 01:31:33,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:31:33,683 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 28 states. [2019-10-15 01:31:34,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:34,942 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2019-10-15 01:31:34,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 01:31:34,943 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2019-10-15 01:31:34,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:34,944 INFO L225 Difference]: With dead ends: 76 [2019-10-15 01:31:34,944 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:31:34,946 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2019-10-15 01:31:34,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:31:34,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-15 01:31:34,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:31:34,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-15 01:31:34,955 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2019-10-15 01:31:34,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:34,955 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-15 01:31:34,956 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-15 01:31:34,956 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-15 01:31:34,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-15 01:31:34,957 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:34,957 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:35,162 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:35,162 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:35,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:35,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1011736431, now seen corresponding path program 8 times [2019-10-15 01:31:35,163 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:35,164 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785740092] [2019-10-15 01:31:35,164 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:35,164 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:35,164 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:35,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:36,109 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 47 [2019-10-15 01:31:36,570 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 53 [2019-10-15 01:31:36,735 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 58 [2019-10-15 01:31:36,885 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 46 [2019-10-15 01:31:37,039 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 41 [2019-10-15 01:31:37,324 WARN L191 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 57 [2019-10-15 01:31:37,481 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-10-15 01:31:37,654 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2019-10-15 01:31:37,798 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 45 [2019-10-15 01:31:38,218 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 1 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:38,219 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785740092] [2019-10-15 01:31:38,219 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758929947] [2019-10-15 01:31:38,219 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:38,363 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:38,363 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:38,365 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 84 conjunts are in the unsatisfiable core [2019-10-15 01:31:38,368 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:39,506 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:39,507 INFO L321 TraceCheckSpWp]: Computing backward predicates...