/usr/bin/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/loops/vogal-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:04:11,081 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:04:11,083 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:04:11,096 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:04:11,097 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:04:11,098 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:04:11,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:04:11,102 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:04:11,104 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:04:11,105 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:04:11,106 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:04:11,107 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:04:11,107 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:04:11,108 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:04:11,109 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:04:11,110 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:04:11,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:04:11,112 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:04:11,114 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:04:11,116 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:04:11,118 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:04:11,119 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:04:11,120 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:04:11,121 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:04:11,124 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 04:04:11,132 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:04:11,133 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:04:11,134 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:04:11,134 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 [2019-11-07 04:04:11,149 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:04:11,149 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:04:11,150 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:04:11,151 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:04:11,151 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:04:11,151 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:04:11,151 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:04:11,152 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:04:11,152 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:04:11,152 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:04:11,152 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:04:11,152 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:04:11,153 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:04:11,153 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:04:11,153 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:04:11,153 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:04:11,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:04:11,154 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:04:11,154 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:04:11,154 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:04:11,156 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:04:11,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:04:11,157 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:04:11,157 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:04:11,157 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:04:11,157 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:04:11,157 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:04:11,157 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:04:11,158 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 [2019-11-07 04:04:11,438 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:04:11,452 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:04:11,455 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:04:11,457 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:04:11,457 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:04:11,458 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-2.i [2019-11-07 04:04:11,539 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1dfbef8d7/3a18d1dbe6ae4b7ea929a07f4ba49cde/FLAGfd99d95d0 [2019-11-07 04:04:11,969 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:04:11,970 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i [2019-11-07 04:04:11,976 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1dfbef8d7/3a18d1dbe6ae4b7ea929a07f4ba49cde/FLAGfd99d95d0 [2019-11-07 04:04:12,349 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1dfbef8d7/3a18d1dbe6ae4b7ea929a07f4ba49cde [2019-11-07 04:04:12,373 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:04:12,380 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:04:12,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:04:12,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:04:12,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:04:12,395 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fe26cf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12, skipping insertion in model container [2019-11-07 04:04:12,402 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,413 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:04:12,443 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:04:12,676 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:04:12,680 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:04:12,709 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:04:12,807 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:04:12,807 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12 WrapperNode [2019-11-07 04:04:12,808 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:04:12,808 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:04:12,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:04:12,809 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:04:12,820 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,820 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,827 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,828 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,837 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,844 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (1/1) ... [2019-11-07 04:04:12,849 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:04:12,850 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:04:12,850 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:04:12,850 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:04:12,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (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 [2019-11-07 04:04:12,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:04:12,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:04:12,913 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:04:12,913 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:04:12,913 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:04:12,913 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:04:12,913 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-11-07 04:04:12,913 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:04:12,914 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 04:04:12,914 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-11-07 04:04:12,914 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:04:12,914 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:04:12,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:04:12,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:04:12,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:04:13,401 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:04:13,402 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-07 04:04:13,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:04:13 BoogieIcfgContainer [2019-11-07 04:04:13,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:04:13,405 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:04:13,405 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:04:13,408 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:04:13,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:04:12" (1/3) ... [2019-11-07 04:04:13,409 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18763baf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:04:13, skipping insertion in model container [2019-11-07 04:04:13,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:12" (2/3) ... [2019-11-07 04:04:13,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18763baf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:04:13, skipping insertion in model container [2019-11-07 04:04:13,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:04:13" (3/3) ... [2019-11-07 04:04:13,412 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2019-11-07 04:04:13,422 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:04:13,429 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:04:13,439 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:04:13,465 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:04:13,465 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:04:13,465 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:04:13,466 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:04:13,466 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:04:13,466 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:04:13,466 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:04:13,466 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:04:13,485 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-11-07 04:04:13,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 04:04:13,492 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:13,493 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:13,495 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:13,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:13,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1300943193, now seen corresponding path program 1 times [2019-11-07 04:04:13,508 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:13,508 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489766994] [2019-11-07 04:04:13,509 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:13,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:13,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:04:13,652 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489766994] [2019-11-07 04:04:13,653 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:13,653 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 04:04:13,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488291413] [2019-11-07 04:04:13,660 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 04:04:13,660 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:13,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 04:04:13,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 04:04:13,681 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2019-11-07 04:04:13,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:13,710 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2019-11-07 04:04:13,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 04:04:13,712 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2019-11-07 04:04:13,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:13,724 INFO L225 Difference]: With dead ends: 42 [2019-11-07 04:04:13,724 INFO L226 Difference]: Without dead ends: 19 [2019-11-07 04:04:13,729 INFO L630 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 [2019-11-07 04:04:13,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-07 04:04:13,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-07 04:04:13,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 04:04:13,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2019-11-07 04:04:13,779 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 14 [2019-11-07 04:04:13,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:13,779 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2019-11-07 04:04:13,780 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 04:04:13,780 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2019-11-07 04:04:13,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 04:04:13,781 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:13,781 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:13,781 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:13,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:13,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1331812321, now seen corresponding path program 1 times [2019-11-07 04:04:13,783 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:13,783 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162646917] [2019-11-07 04:04:13,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:13,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:13,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:04:13,957 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162646917] [2019-11-07 04:04:13,958 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:13,958 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:04:13,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479372393] [2019-11-07 04:04:13,962 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:04:13,962 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:13,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:04:13,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:04:13,963 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 3 states. [2019-11-07 04:04:14,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:14,052 INFO L93 Difference]: Finished difference Result 39 states and 53 transitions. [2019-11-07 04:04:14,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:04:14,053 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-07 04:04:14,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:14,056 INFO L225 Difference]: With dead ends: 39 [2019-11-07 04:04:14,056 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 04:04:14,057 INFO L630 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 [2019-11-07 04:04:14,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 04:04:14,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2019-11-07 04:04:14,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 04:04:14,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2019-11-07 04:04:14,073 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 16 [2019-11-07 04:04:14,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:14,073 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2019-11-07 04:04:14,074 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:04:14,074 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2019-11-07 04:04:14,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 04:04:14,075 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:14,075 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:14,076 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:14,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:14,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1442987554, now seen corresponding path program 1 times [2019-11-07 04:04:14,077 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:14,077 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533463798] [2019-11-07 04:04:14,078 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:14,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:14,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:04:14,225 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533463798] [2019-11-07 04:04:14,225 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408904116] [2019-11-07 04:04:14,225 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 [2019-11-07 04:04:14,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:14,307 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 04:04:14,317 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:14,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 04:04:14,380 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:14,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 04:04:14,474 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 04:04:14,474 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [4] total 12 [2019-11-07 04:04:14,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623871514] [2019-11-07 04:04:14,475 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-07 04:04:14,475 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:14,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-07 04:04:14,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-11-07 04:04:14,476 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand 10 states. [2019-11-07 04:04:14,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:14,591 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2019-11-07 04:04:14,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 04:04:14,592 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2019-11-07 04:04:14,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:14,593 INFO L225 Difference]: With dead ends: 34 [2019-11-07 04:04:14,593 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 04:04:14,594 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-11-07 04:04:14,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 04:04:14,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2019-11-07 04:04:14,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 04:04:14,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2019-11-07 04:04:14,600 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 17 [2019-11-07 04:04:14,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:14,600 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2019-11-07 04:04:14,601 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-07 04:04:14,601 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2019-11-07 04:04:14,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 04:04:14,602 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:14,602 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:14,805 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:14,806 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:14,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:14,806 INFO L82 PathProgramCache]: Analyzing trace with hash -68639491, now seen corresponding path program 1 times [2019-11-07 04:04:14,806 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:14,807 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928432906] [2019-11-07 04:04:14,807 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:14,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:14,922 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 04:04:14,923 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928432906] [2019-11-07 04:04:14,924 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835162205] [2019-11-07 04:04:14,924 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-07 04:04:14,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:14,985 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 04:04:14,986 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:15,005 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 04:04:15,005 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:15,027 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 04:04:15,028 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 04:04:15,028 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 8 [2019-11-07 04:04:15,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956233993] [2019-11-07 04:04:15,029 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 04:04:15,029 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:15,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 04:04:15,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-07 04:04:15,030 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand 6 states. [2019-11-07 04:04:15,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:15,091 INFO L93 Difference]: Finished difference Result 55 states and 76 transitions. [2019-11-07 04:04:15,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 04:04:15,092 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-11-07 04:04:15,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:15,093 INFO L225 Difference]: With dead ends: 55 [2019-11-07 04:04:15,093 INFO L226 Difference]: Without dead ends: 40 [2019-11-07 04:04:15,094 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-07 04:04:15,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-07 04:04:15,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 29. [2019-11-07 04:04:15,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 04:04:15,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2019-11-07 04:04:15,101 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 20 [2019-11-07 04:04:15,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:15,101 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2019-11-07 04:04:15,101 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 04:04:15,101 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2019-11-07 04:04:15,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 04:04:15,102 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:15,102 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:15,303 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:15,303 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:15,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:15,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1439104631, now seen corresponding path program 1 times [2019-11-07 04:04:15,306 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:15,306 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624330109] [2019-11-07 04:04:15,306 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:15,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:15,377 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 04:04:15,379 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624330109] [2019-11-07 04:04:15,379 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994337930] [2019-11-07 04:04:15,380 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-07 04:04:15,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:15,428 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-07 04:04:15,430 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:15,567 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-07 04:04:15,569 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:15,572 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:04:15,572 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:04:15,573 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-07 04:04:15,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 04:04:15,584 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:15,655 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:15,667 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:04:15,671 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 13 [2019-11-07 04:04:15,672 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:15,681 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:04:15,681 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2019-11-07 04:04:15,682 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:15,683 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:15,693 INFO L567 ElimStorePlain]: treesize reduction 13, result has 35.0 percent of original size [2019-11-07 04:04:15,693 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:04:15,694 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:7 [2019-11-07 04:04:15,729 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 04:04:15,730 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-07 04:04:15,730 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 9] total 15 [2019-11-07 04:04:15,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829819577] [2019-11-07 04:04:15,732 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-07 04:04:15,732 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:15,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-07 04:04:15,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2019-11-07 04:04:15,733 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 7 states. [2019-11-07 04:04:15,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:15,930 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2019-11-07 04:04:15,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 04:04:15,931 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-11-07 04:04:15,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:15,932 INFO L225 Difference]: With dead ends: 42 [2019-11-07 04:04:15,932 INFO L226 Difference]: Without dead ends: 27 [2019-11-07 04:04:15,933 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2019-11-07 04:04:15,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-07 04:04:15,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-07 04:04:15,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-07 04:04:15,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2019-11-07 04:04:15,938 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 21 [2019-11-07 04:04:15,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:15,939 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2019-11-07 04:04:15,939 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-07 04:04:15,939 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2019-11-07 04:04:15,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 04:04:15,940 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:15,940 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:16,151 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:16,152 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:16,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:16,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1784666200, now seen corresponding path program 1 times [2019-11-07 04:04:16,161 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:16,162 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808345465] [2019-11-07 04:04:16,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:16,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:16,306 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 04:04:16,306 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808345465] [2019-11-07 04:04:16,306 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398523166] [2019-11-07 04:04:16,307 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-07 04:04:16,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:16,376 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-07 04:04:16,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:16,493 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-07 04:04:16,494 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,497 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:04:16,498 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,498 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-07 04:04:16,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 04:04:16,512 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:16,582 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:16,585 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:16,587 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:16,607 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:04:16,608 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2019-11-07 04:04:16,609 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:04:16,610 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,616 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:04:16,619 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 13 [2019-11-07 04:04:16,620 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,628 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:04:16,629 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 04:04:16,632 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:04:16,633 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 15 [2019-11-07 04:04:16,633 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,645 INFO L567 ElimStorePlain]: treesize reduction 13, result has 35.0 percent of original size [2019-11-07 04:04:16,645 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:04:16,645 INFO L221 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:85, output treesize:7 [2019-11-07 04:04:16,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 04:04:16,668 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509974378] [2019-11-07 04:04:16,708 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 04:04:16,709 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:16,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:16,724 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:16,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:16,823 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:04:17,013 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 04:04:17,289 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:04:17,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:04:17,303 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:17,970 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:04:17,970 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9, 7, 16] total 30 [2019-11-07 04:04:17,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502176469] [2019-11-07 04:04:17,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 04:04:17,973 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:17,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 04:04:17,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=777, Unknown=0, NotChecked=0, Total=870 [2019-11-07 04:04:17,975 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 30 states. [2019-11-07 04:04:18,738 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-11-07 04:04:18,912 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 46 [2019-11-07 04:04:19,600 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 58 [2019-11-07 04:04:19,742 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2019-11-07 04:04:19,906 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 50 [2019-11-07 04:04:20,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:20,279 INFO L93 Difference]: Finished difference Result 50 states and 73 transitions. [2019-11-07 04:04:20,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-07 04:04:20,279 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 22 [2019-11-07 04:04:20,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:20,281 INFO L225 Difference]: With dead ends: 50 [2019-11-07 04:04:20,281 INFO L226 Difference]: Without dead ends: 35 [2019-11-07 04:04:20,283 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=400, Invalid=2150, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 04:04:20,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-07 04:04:20,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2019-11-07 04:04:20,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 04:04:20,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2019-11-07 04:04:20,291 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 22 [2019-11-07 04:04:20,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:20,291 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2019-11-07 04:04:20,291 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 04:04:20,291 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2019-11-07 04:04:20,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 04:04:20,292 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:20,292 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:20,499 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:20,500 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:20,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:20,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1863962312, now seen corresponding path program 1 times [2019-11-07 04:04:20,500 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:20,500 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657372625] [2019-11-07 04:04:20,501 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:20,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:20,656 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 04:04:20,656 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657372625] [2019-11-07 04:04:20,656 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720586506] [2019-11-07 04:04:20,657 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-07 04:04:20,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:20,739 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 04:04:20,743 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:20,765 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-11-07 04:04:20,769 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:20,842 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 04:04:20,842 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [352716374] [2019-11-07 04:04:20,844 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:04:20,844 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:20,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:20,846 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:20,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:20,882 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:04:20,995 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 04:04:21,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 04:04:21,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:04:21,376 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:22,115 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:04:22,116 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 6, 17] total 27 [2019-11-07 04:04:22,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597089725] [2019-11-07 04:04:22,117 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 04:04:22,117 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:22,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 04:04:22,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2019-11-07 04:04:22,121 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand 27 states. [2019-11-07 04:04:23,623 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 52 [2019-11-07 04:04:23,943 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 60 [2019-11-07 04:04:24,107 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2019-11-07 04:04:24,877 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 42 [2019-11-07 04:04:25,044 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2019-11-07 04:04:25,220 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 50 [2019-11-07 04:04:25,392 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 49 [2019-11-07 04:04:25,556 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 64 [2019-11-07 04:04:26,666 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2019-11-07 04:04:28,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:28,496 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2019-11-07 04:04:28,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-11-07 04:04:28,498 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 28 [2019-11-07 04:04:28,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:28,500 INFO L225 Difference]: With dead ends: 100 [2019-11-07 04:04:28,500 INFO L226 Difference]: Without dead ends: 78 [2019-11-07 04:04:28,504 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=994, Invalid=4858, Unknown=0, NotChecked=0, Total=5852 [2019-11-07 04:04:28,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-07 04:04:28,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 34. [2019-11-07 04:04:28,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 04:04:28,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-11-07 04:04:28,514 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2019-11-07 04:04:28,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:28,514 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-11-07 04:04:28,514 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 04:04:28,514 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-11-07 04:04:28,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 04:04:28,515 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:28,515 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:28,719 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:28,719 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:28,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:28,719 INFO L82 PathProgramCache]: Analyzing trace with hash -988618494, now seen corresponding path program 2 times [2019-11-07 04:04:28,720 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:28,720 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303863392] [2019-11-07 04:04:28,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:28,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:28,878 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-11-07 04:04:28,879 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303863392] [2019-11-07 04:04:28,879 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949494843] [2019-11-07 04:04:28,879 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 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 [2019-11-07 04:04:28,989 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 04:04:28,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:04:28,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-07 04:04:28,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:29,011 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-11-07 04:04:29,011 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:29,121 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-11-07 04:04:29,121 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052929349] [2019-11-07 04:04:29,123 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:04:29,123 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:29,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:29,124 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:29,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:29,160 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:04:29,236 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 04:04:29,543 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 04:04:29,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:04:29,551 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:30,133 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:04:30,133 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 17] total 29 [2019-11-07 04:04:30,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074112351] [2019-11-07 04:04:30,135 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 04:04:30,135 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:30,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 04:04:30,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2019-11-07 04:04:30,136 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 29 states. [2019-11-07 04:04:30,632 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 20 [2019-11-07 04:04:32,108 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 50 [2019-11-07 04:04:32,304 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2019-11-07 04:04:32,920 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 51 [2019-11-07 04:04:33,134 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 65 [2019-11-07 04:04:33,982 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 51 [2019-11-07 04:04:34,165 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 65 [2019-11-07 04:04:34,582 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43 [2019-11-07 04:04:34,762 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 51 [2019-11-07 04:04:39,082 WARN L191 SmtUtils]: Spent 4.20 s on a formula simplification. DAG size of input: 57 DAG size of output: 49 [2019-11-07 04:04:39,295 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 65 [2019-11-07 04:04:40,193 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2019-11-07 04:04:40,374 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 51 [2019-11-07 04:04:42,696 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 65 [2019-11-07 04:04:45,033 WARN L191 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 49 [2019-11-07 04:04:45,346 WARN L191 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 57 [2019-11-07 04:04:45,664 WARN L191 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 64 [2019-11-07 04:04:48,141 WARN L191 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 80 DAG size of output: 68 [2019-11-07 04:04:49,002 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 57 [2019-11-07 04:04:49,746 WARN L191 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 64 [2019-11-07 04:04:50,060 WARN L191 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 68