/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:00:19,393 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:00:19,396 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:00:19,407 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:00:19,408 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:00:19,409 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:00:19,410 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:00:19,412 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:00:19,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:00:19,414 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:00:19,415 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:00:19,416 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:00:19,417 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:00:19,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:00:19,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:00:19,420 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:00:19,420 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:00:19,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:00:19,423 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:00:19,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:00:19,427 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:00:19,428 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:00:19,429 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:00:19,430 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:00:19,433 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:00:19,441 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:00:19,441 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:00:19,442 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:00:19,443 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 [2020-07-20 11:00:19,458 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:00:19,458 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:00:19,460 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:00:19,460 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:00:19,460 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:00:19,460 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:00:19,460 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:00:19,461 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:00:19,461 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:00:19,461 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:00:19,461 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:00:19,461 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:00:19,462 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:00:19,462 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:00:19,462 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:00:19,462 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:00:19,462 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:00:19,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:00:19,463 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:00:19,463 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:00:19,463 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:00:19,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:19,464 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:00:19,464 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:00:19,464 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:00:19,464 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:00:19,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:19,465 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:00:19,465 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:00:19,465 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:00:19,733 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:00:19,747 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:00:19,751 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:00:19,752 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:00:19,753 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:00:19,754 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 11:00:19,834 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2131de78/6bcf1ceae381422cb27799c526806372/FLAG8cb7142db [2020-07-20 11:00:20,316 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:00:20,317 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 11:00:20,324 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2131de78/6bcf1ceae381422cb27799c526806372/FLAG8cb7142db [2020-07-20 11:00:20,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2131de78/6bcf1ceae381422cb27799c526806372 [2020-07-20 11:00:20,688 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:20,691 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:20,692 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:20,692 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:20,696 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:20,697 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20a42054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20, skipping insertion in model container [2020-07-20 11:00:20,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,709 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:20,725 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:20,886 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:20,891 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:20,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:20,924 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:20,925 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20 WrapperNode [2020-07-20 11:00:20,925 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:20,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:20,926 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:20,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:20,939 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,940 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,946 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,946 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,950 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,952 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,953 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (1/1) ... [2020-07-20 11:00:20,955 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:20,955 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:20,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:20,956 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:20,957 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (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 [2020-07-20 11:00:21,118 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:21,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:21,119 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 11:00:21,119 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:21,119 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:21,119 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:21,119 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 11:00:21,119 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:21,119 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:21,289 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:21,290 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:21,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:21 BoogieIcfgContainer [2020-07-20 11:00:21,294 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:21,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:21,296 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:21,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:21,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:20" (1/3) ... [2020-07-20 11:00:21,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75fef767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:21, skipping insertion in model container [2020-07-20 11:00:21,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:20" (2/3) ... [2020-07-20 11:00:21,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75fef767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:21, skipping insertion in model container [2020-07-20 11:00:21,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:21" (3/3) ... [2020-07-20 11:00:21,303 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-20 11:00:21,313 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:21,320 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:21,335 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:21,360 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:21,361 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:21,361 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:21,361 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:21,361 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:21,361 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:21,362 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:21,362 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:21,380 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 11:00:21,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:21,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:21,388 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:21,389 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:21,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:21,395 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 11:00:21,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:21,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272095333] [2020-07-20 11:00:21,405 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:21,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:21,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:21,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:21,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:21,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272095333] [2020-07-20 11:00:21,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:21,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:21,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129431923] [2020-07-20 11:00:21,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:21,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:21,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:21,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:21,602 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 11:00:21,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:21,704 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:00:21,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:21,706 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:21,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:21,716 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:00:21,717 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:00:21,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:21,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:00:21,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:00:21,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:21,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:21,769 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 11:00:21,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:21,770 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:21,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:21,770 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:21,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:21,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:21,773 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:21,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,989 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:21,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:21,990 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 11:00:21,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:21,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515403643] [2020-07-20 11:00:21,991 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:22,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:22,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:22,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:22,083 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:22,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515403643] [2020-07-20 11:00:22,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:22,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:22,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775969276] [2020-07-20 11:00:22,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:22,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:22,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:22,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:22,088 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 11:00:22,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:22,150 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 11:00:22,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:22,151 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:22,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:22,153 INFO L225 Difference]: With dead ends: 27 [2020-07-20 11:00:22,153 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:00:22,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:22,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:00:22,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 11:00:22,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:22,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:22,164 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 11:00:22,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:22,164 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:22,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:22,165 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:22,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:22,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:22,166 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:22,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:22,381 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:22,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:22,382 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 11:00:22,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:22,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958313902] [2020-07-20 11:00:22,383 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:22,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:22,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:22,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:22,505 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:22,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:22,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:22,715 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:22,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958313902] [2020-07-20 11:00:22,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:22,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:22,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759325639] [2020-07-20 11:00:22,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:22,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:22,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:22,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:22,719 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 11:00:22,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:22,869 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 11:00:22,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:22,870 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 11:00:22,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:22,872 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:00:22,872 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:00:22,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:22,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:00:22,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 11:00:22,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:22,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:22,882 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 11:00:22,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:22,883 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:22,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:22,883 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:22,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:22,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:22,885 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:23,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,098 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:23,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:23,099 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 11:00:23,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:23,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408944083] [2020-07-20 11:00:23,101 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,178 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:00:23,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:23,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:23,381 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:23,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408944083] [2020-07-20 11:00:23,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:23,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:23,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112539929] [2020-07-20 11:00:23,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:23,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:23,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:23,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:23,384 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 11:00:23,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:23,477 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 11:00:23,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:23,477 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 11:00:23,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:23,480 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:00:23,480 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:00:23,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:23,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:00:23,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 11:00:23,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:23,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:23,490 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 11:00:23,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:23,490 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:23,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:23,491 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:23,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:23,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:23,493 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:23,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,707 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:23,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:23,708 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 11:00:23,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:23,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739179637] [2020-07-20 11:00:23,710 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,802 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 11:00:23,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:24,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,146 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:24,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739179637] [2020-07-20 11:00:24,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:24,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448602054] [2020-07-20 11:00:24,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:24,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:24,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:24,149 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 11:00:24,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,295 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 11:00:24,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:24,296 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 11:00:24,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,298 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:00:24,298 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:00:24,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:24,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:00:24,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 11:00:24,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:24,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:24,319 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 11:00:24,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:24,320 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:24,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:24,320 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:24,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 11:00:24,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,324 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,539 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 11:00:24,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213759989] [2020-07-20 11:00:24,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:24,617 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 11:00:24,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:24,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,938 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:24,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213759989] [2020-07-20 11:00:24,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:24,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284376836] [2020-07-20 11:00:24,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:24,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:24,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:24,946 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 11:00:25,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:25,081 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 11:00:25,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:25,082 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 11:00:25,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:25,084 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:00:25,084 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 11:00:25,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:25,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 11:00:25,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 11:00:25,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:25,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:25,097 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 11:00:25,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,097 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:25,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:25,097 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:25,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:00:25,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,100 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:25,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,304 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,305 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 11:00:25,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107692553] [2020-07-20 11:00:25,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,410 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:00:25,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:25,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,047 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:00:26,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107692553] [2020-07-20 11:00:26,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:26,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:26,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123059037] [2020-07-20 11:00:26,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:26,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:26,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:26,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:26,049 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 11:00:26,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,217 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 11:00:26,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:26,217 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 11:00:26,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,220 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:00:26,220 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:00:26,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:26,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:00:26,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 11:00:26,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:26,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:26,233 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 11:00:26,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,234 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:26,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:26,234 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:26,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 11:00:26,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,237 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:26,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,451 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 11:00:26,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108833193] [2020-07-20 11:00:26,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:26,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,576 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 11:00:26,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:27,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,203 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 11:00:27,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108833193] [2020-07-20 11:00:27,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:27,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:27,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671789248] [2020-07-20 11:00:27,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:27,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:27,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:27,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:27,206 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 11:00:27,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:27,353 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 11:00:27,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:27,356 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 11:00:27,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:27,362 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:00:27,362 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 11:00:27,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:27,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 11:00:27,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 11:00:27,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:27,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:27,386 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 11:00:27,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:27,387 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:27,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:27,387 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:27,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 11:00:27,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:27,393 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:27,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,609 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:27,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:27,609 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 11:00:27,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:27,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21805452] [2020-07-20 11:00:27,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:27,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:27,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:27,752 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 11:00:27,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:28,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 11:00:28,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21805452] [2020-07-20 11:00:28,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:28,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:28,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425026204] [2020-07-20 11:00:28,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:28,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:28,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:28,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:28,745 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 11:00:29,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:29,018 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 11:00:29,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:29,019 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 11:00:29,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:29,022 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:00:29,022 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:00:29,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:29,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:00:29,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 11:00:29,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:29,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:29,036 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 11:00:29,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:29,037 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:29,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:29,037 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:29,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 11:00:29,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:29,041 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:29,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,255 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:29,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:29,256 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 11:00:29,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:29,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512530102] [2020-07-20 11:00:29,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:29,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:29,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:29,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 11:00:29,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:30,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 11:00:30,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512530102] [2020-07-20 11:00:30,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:30,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:30,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289973333] [2020-07-20 11:00:30,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:30,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:30,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:30,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:30,548 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 11:00:30,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:30,711 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 11:00:30,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:30,711 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 11:00:30,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:30,714 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:00:30,714 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:00:30,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:30,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:00:30,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 11:00:30,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:30,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:30,728 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 11:00:30,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:30,729 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:30,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:30,729 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:30,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:00:30,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:30,733 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:30,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:30,948 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:30,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:30,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 11:00:30,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:30,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093827219] [2020-07-20 11:00:30,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:31,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:31,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:31,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:31,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 11:00:31,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:32,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 11:00:33,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093827219] [2020-07-20 11:00:33,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:33,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:33,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940943062] [2020-07-20 11:00:33,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:33,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:33,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:33,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:33,062 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 11:00:33,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:33,301 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 11:00:33,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:33,302 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 11:00:33,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:33,306 INFO L225 Difference]: With dead ends: 72 [2020-07-20 11:00:33,306 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 11:00:33,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:33,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 11:00:33,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 11:00:33,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:33,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:33,336 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 11:00:33,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:33,337 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:33,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:33,339 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:33,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 11:00:33,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:33,345 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:33,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,561 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:33,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:33,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 11:00:33,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:33,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045854182] [2020-07-20 11:00:33,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:33,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:33,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:33,796 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 11:00:33,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:35,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 11:00:35,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045854182] [2020-07-20 11:00:35,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:35,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:35,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237114083] [2020-07-20 11:00:35,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:35,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:35,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:35,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:35,852 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 11:00:36,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:36,066 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 11:00:36,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:36,067 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 11:00:36,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:36,075 INFO L225 Difference]: With dead ends: 77 [2020-07-20 11:00:36,075 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:00:36,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:36,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:00:36,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 11:00:36,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:36,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:36,104 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 11:00:36,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:36,105 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:36,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:36,105 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:36,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 11:00:36,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:36,120 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:36,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,334 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:36,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:36,334 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 11:00:36,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:36,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412442649] [2020-07-20 11:00:36,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:36,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:36,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 11:00:36,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:38,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,053 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 11:00:40,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412442649] [2020-07-20 11:00:40,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:40,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:40,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514150714] [2020-07-20 11:00:40,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:40,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:40,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:40,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:40,056 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 11:00:40,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:40,495 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 11:00:40,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:40,496 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 11:00:40,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:40,500 INFO L225 Difference]: With dead ends: 82 [2020-07-20 11:00:40,500 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:00:40,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:40,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:00:40,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 11:00:40,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:40,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:40,514 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 11:00:40,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:40,515 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:40,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:40,515 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:40,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 11:00:40,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:40,519 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:40,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:40,733 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:40,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:40,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 11:00:40,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:40,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211138067] [2020-07-20 11:00:40,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:40,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:40,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:40,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:41,190 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 11:00:41,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:42,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,171 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 11:00:44,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211138067] [2020-07-20 11:00:44,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:44,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:44,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668527271] [2020-07-20 11:00:44,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:44,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:44,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:44,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:44,174 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 11:00:44,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:44,451 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 11:00:44,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:44,451 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 11:00:44,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:44,455 INFO L225 Difference]: With dead ends: 87 [2020-07-20 11:00:44,455 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 11:00:44,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:44,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 11:00:44,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 11:00:44,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:44,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:44,486 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 11:00:44,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:44,533 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:44,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:44,534 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:44,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 11:00:44,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:44,554 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:44,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:44,768 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:44,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:44,769 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 11:00:44,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:44,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5908960] [2020-07-20 11:00:44,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:45,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:45,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 2380 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:45,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:45,907 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 11:00:45,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:49,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:49,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:50,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,568 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 11:00:52,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5908960] [2020-07-20 11:00:52,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:52,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:52,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036808346] [2020-07-20 11:00:52,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:52,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:52,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:52,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:52,573 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 11:00:53,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:53,159 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 11:00:53,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:53,160 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 11:00:53,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:53,166 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:00:53,166 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:00:53,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:53,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:00:53,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 11:00:53,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:53,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:53,181 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 11:00:53,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:53,182 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:53,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:53,183 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:53,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-20 11:00:53,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:53,190 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 84, 50, 50, 50, 50, 50, 50, 50, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:53,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:53,403 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:53,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:53,403 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-20 11:00:53,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:53,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951589022] [2020-07-20 11:00:53,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:53,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:53,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 1549 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:53,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:54,063 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3626 refuted. 0 times theorem prover too weak. 24423 trivial. 0 not checked. [2020-07-20 11:00:54,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:56,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:59,077 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3703 refuted. 0 times theorem prover too weak. 24346 trivial. 0 not checked. [2020-07-20 11:00:59,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951589022] [2020-07-20 11:00:59,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:59,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:59,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506871171] [2020-07-20 11:00:59,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:59,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:59,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:59,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:59,085 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 11:00:59,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:59,794 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 11:00:59,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:59,796 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-20 11:00:59,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:59,802 INFO L225 Difference]: With dead ends: 97 [2020-07-20 11:00:59,802 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 11:00:59,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1401 GetRequests, 1358 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:59,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 11:00:59,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 11:00:59,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:59,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:59,819 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-20 11:00:59,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:59,821 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:59,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:59,821 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:59,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-20 11:00:59,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:59,860 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:00,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:00,076 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:00,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:00,078 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-20 11:01:00,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:00,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194988405] [2020-07-20 11:01:00,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:00,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:00,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 4352 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:00,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:02,427 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11715 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-20 11:01:02,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:07,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11807 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-20 11:01:15,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194988405] [2020-07-20 11:01:15,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:15,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:15,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292501040] [2020-07-20 11:01:15,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:15,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:15,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:15,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:15,307 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 11:01:15,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:15,730 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 11:01:15,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:15,730 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-20 11:01:15,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:15,738 INFO L225 Difference]: With dead ends: 102 [2020-07-20 11:01:15,738 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 11:01:15,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:15,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 11:01:15,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 11:01:15,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:15,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:15,754 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-20 11:01:15,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:15,757 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:15,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:15,757 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:15,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-20 11:01:15,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:15,776 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 164, 98, 98, 98, 98, 98, 98, 98, 66, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:15,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:15,978 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:15,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:15,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-20 11:01:15,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:15,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991643961] [2020-07-20 11:01:15,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:16,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:16,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 3005 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:16,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:17,583 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8306 refuted. 0 times theorem prover too weak. 100095 trivial. 0 not checked. [2020-07-20 11:01:17,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:21,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:24,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:24,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,040 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8406 refuted. 0 times theorem prover too weak. 99995 trivial. 0 not checked. [2020-07-20 11:01:27,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991643961] [2020-07-20 11:01:27,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:27,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:27,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521429822] [2020-07-20 11:01:27,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:27,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:27,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:27,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:27,044 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 11:01:27,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:27,597 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 11:01:27,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:27,598 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-20 11:01:27,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:27,605 INFO L225 Difference]: With dead ends: 107 [2020-07-20 11:01:27,605 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 11:01:27,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:27,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 11:01:27,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 11:01:27,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:27,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:27,622 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-20 11:01:27,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:27,624 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:27,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:27,624 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:27,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-20 11:01:27,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:27,676 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:27,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:27,878 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:27,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:27,880 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-20 11:01:27,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:27,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576263845] [2020-07-20 11:01:27,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:28,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:28,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 6092 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:28,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:32,477 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-20 11:01:32,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:40,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:48,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:48,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:52,595 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-20 11:01:52,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576263845] [2020-07-20 11:01:52,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:52,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:01:52,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105258433] [2020-07-20 11:01:52,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:52,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:52,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:52,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:52,600 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 11:01:53,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:53,436 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 11:01:53,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:53,436 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-20 11:01:53,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:53,444 INFO L225 Difference]: With dead ends: 112 [2020-07-20 11:01:53,445 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:01:53,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:53,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:01:53,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 11:01:53,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:01:53,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:01:53,461 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-20 11:01:53,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:53,464 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:01:53,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:53,464 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:01:53,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2536 [2020-07-20 11:01:53,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:53,535 INFO L422 BasicCegarLoop]: trace histogram [371, 371, 302, 185, 185, 185, 185, 185, 185, 185, 117, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:53,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:53,736 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:53,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:53,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1256486072, now seen corresponding path program 9 times [2020-07-20 11:01:53,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:53,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612168320] [2020-07-20 11:01:53,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:54,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:54,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 5630 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:54,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:56,860 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17788 refuted. 0 times theorem prover too weak. 367787 trivial. 0 not checked. [2020-07-20 11:01:56,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:04,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:10,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:10,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:12,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:12,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:12,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:13,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:13,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:13,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:13,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:15,252 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17914 refuted. 0 times theorem prover too weak. 367661 trivial. 0 not checked. [2020-07-20 11:02:15,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612168320] [2020-07-20 11:02:15,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:15,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:02:15,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993332522] [2020-07-20 11:02:15,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:15,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:15,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:15,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:15,262 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 11:02:16,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:16,140 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 11:02:16,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:02:16,141 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2535 [2020-07-20 11:02:16,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:16,148 INFO L225 Difference]: With dead ends: 117 [2020-07-20 11:02:16,148 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 11:02:16,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5079 GetRequests, 5026 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:16,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 11:02:16,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 11:02:16,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:02:16,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:02:16,166 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2535 [2020-07-20 11:02:16,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:16,169 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:02:16,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:16,169 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:02:16,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4720 [2020-07-20 11:02:16,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:16,340 INFO L422 BasicCegarLoop]: trace histogram [725, 725, 363, 362, 362, 362, 362, 362, 362, 362, 362, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:16,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:16,541 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:16,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:16,543 INFO L82 PathProgramCache]: Analyzing trace with hash 668131987, now seen corresponding path program 10 times [2020-07-20 11:02:16,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:16,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792960223] [2020-07-20 11:02:16,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:18,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:18,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 10529 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:02:18,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 36919 refuted. 0 times theorem prover too weak. 1335098 trivial. 0 not checked. [2020-07-20 11:02:25,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:43,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:50,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:54,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:55,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:56,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:57,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:57,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:05,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 37064 refuted. 0 times theorem prover too weak. 1334953 trivial. 0 not checked. [2020-07-20 11:03:05,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792960223] [2020-07-20 11:03:05,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:05,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:03:05,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73021536] [2020-07-20 11:03:05,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:03:05,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:05,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:03:05,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:03:05,264 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 11:03:06,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:06,600 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 11:03:06,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:03:06,601 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4719 [2020-07-20 11:03:06,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:06,614 INFO L225 Difference]: With dead ends: 122 [2020-07-20 11:03:06,614 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 11:03:06,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9449 GetRequests, 9391 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:03:06,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 11:03:06,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 11:03:06,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:03:06,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:03:06,644 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4719 [2020-07-20 11:03:06,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:06,651 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:03:06,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:03:06,651 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:03:06,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7035 [2020-07-20 11:03:06,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:06,986 INFO L422 BasicCegarLoop]: trace histogram [1033, 1033, 829, 516, 516, 516, 516, 516, 516, 516, 313, 204, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:07,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:07,187 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:07,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:07,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1610110729, now seen corresponding path program 10 times [2020-07-20 11:03:07,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:07,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117881272] [2020-07-20 11:03:07,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:09,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:09,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 15621 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:03:09,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:24,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3006798 backedges. 6917 proven. 56292 refuted. 0 times theorem prover too weak. 2943589 trivial. 0 not checked. [2020-07-20 11:03:24,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:50,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:07,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:07,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:10,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:10,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:12,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:12,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:13,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:13,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:13,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:29,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3006798 backedges. 6917 proven. 56447 refuted. 0 times theorem prover too weak. 2943434 trivial. 0 not checked. [2020-07-20 11:04:29,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117881272] [2020-07-20 11:04:29,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:29,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:04:29,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333283170] [2020-07-20 11:04:29,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:04:29,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:29,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:04:29,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:04:29,735 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 11:04:30,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:30,681 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 11:04:30,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:04:30,686 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7034 [2020-07-20 11:04:30,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:30,696 INFO L225 Difference]: With dead ends: 127 [2020-07-20 11:04:30,696 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 11:04:30,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14078 GetRequests, 14020 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:04:30,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 11:04:30,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 11:04:30,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:04:30,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:04:30,719 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7034 [2020-07-20 11:04:30,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:30,725 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:04:30,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:04:30,725 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:04:31,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7879 [2020-07-20 11:04:31,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:31,299 INFO L422 BasicCegarLoop]: trace histogram [1211, 1211, 606, 605, 605, 605, 605, 605, 605, 605, 605, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:31,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:31,514 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:31,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:31,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1406933828, now seen corresponding path program 11 times [2020-07-20 11:04:31,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:31,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040425979] [2020-07-20 11:04:31,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:34,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:34,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 17576 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:04:34,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:54,169 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8450 proven. 67681 refuted. 0 times theorem prover too weak. 3768039 trivial. 0 not checked. [2020-07-20 11:04:54,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:27,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:39,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:45,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:45,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:51,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:51,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:53,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:54,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:54,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:55,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:55,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:16,080 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8450 proven. 67857 refuted. 0 times theorem prover too weak. 3767863 trivial. 0 not checked. [2020-07-20 11:06:16,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040425979] [2020-07-20 11:06:16,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:16,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:06:16,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005846846] [2020-07-20 11:06:16,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:06:16,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:16,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:06:16,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:06:16,090 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 11:06:17,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:17,431 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 11:06:17,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:06:17,433 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7878 [2020-07-20 11:06:17,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:17,443 INFO L225 Difference]: With dead ends: 132 [2020-07-20 11:06:17,443 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 11:06:17,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15768 GetRequests, 15705 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:06:17,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 11:06:17,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 11:06:17,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:06:17,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:06:17,467 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7878 [2020-07-20 11:06:17,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:17,472 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:06:17,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:06:17,473 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:06:17,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5607 [2020-07-20 11:06:17,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:17,655 INFO L422 BasicCegarLoop]: trace histogram [823, 823, 661, 411, 411, 411, 411, 411, 411, 411, 250, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:17,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:17,856 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:17,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:17,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1269911056, now seen corresponding path program 11 times [2020-07-20 11:06:17,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:17,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945256131] [2020-07-20 11:06:17,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:19,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:19,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 12450 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:06:20,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:30,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1908162 backedges. 5275 proven. 49606 refuted. 0 times theorem prover too weak. 1853281 trivial. 0 not checked. [2020-07-20 11:06:30,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:55,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:55,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:02,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:09,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:09,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:11,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:11,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:13,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:13,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:14,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:14,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:15,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:15,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:27,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1908162 backedges. 5275 proven. 49793 refuted. 0 times theorem prover too weak. 1853094 trivial. 0 not checked. [2020-07-20 11:07:27,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945256131] [2020-07-20 11:07:27,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:27,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:07:27,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767597636] [2020-07-20 11:07:27,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:07:27,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:27,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:07:27,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:07:27,676 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 11:07:29,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:29,334 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 11:07:29,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:07:29,336 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5606 [2020-07-20 11:07:29,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:29,345 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:07:29,345 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:07:29,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11223 GetRequests, 11160 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:07:29,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:07:29,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 11:07:29,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:07:29,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:07:29,371 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5606 [2020-07-20 11:07:29,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:29,374 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:07:29,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:07:29,374 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:07:31,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-20 11:07:31,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:31,117 INFO L422 BasicCegarLoop]: trace histogram [1943, 1943, 972, 971, 971, 971, 971, 971, 971, 971, 971, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:31,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:31,318 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:31,323 INFO L82 PathProgramCache]: Analyzing trace with hash 904472140, now seen corresponding path program 12 times [2020-07-20 11:07:31,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:31,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835952002] [2020-07-20 11:07:31,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:35,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:35,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 28190 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:07:36,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:28,532 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13757 proven. 119407 refuted. 0 times theorem prover too weak. 9768123 trivial. 0 not checked. [2020-07-20 11:08:28,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:09:31,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:57,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:57,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:06,824 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:10:11,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:11,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:24,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:29,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:33,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:34,925 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:10:35,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:36,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:36,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:36,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:37,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:37,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:37,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:32,306 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13757 proven. 119617 refuted. 0 times theorem prover too weak. 9767913 trivial. 0 not checked. [2020-07-20 11:11:32,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835952002] [2020-07-20 11:11:32,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:32,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 11:11:32,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424580436] [2020-07-20 11:11:32,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 11:11:32,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:32,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 11:11:32,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 11:11:32,313 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-20 11:11:34,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:34,279 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-20 11:11:34,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 11:11:34,281 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12636 [2020-07-20 11:11:34,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:34,294 INFO L225 Difference]: With dead ends: 142 [2020-07-20 11:11:34,294 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 11:11:34,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25285 GetRequests, 25217 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 11:11:34,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 11:11:34,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-20 11:11:34,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 11:11:34,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-20 11:11:34,324 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12636 [2020-07-20 11:11:34,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:34,331 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-20 11:11:34,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 11:11:34,331 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-20 11:11:35,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10881 [2020-07-20 11:11:35,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:35,733 INFO L422 BasicCegarLoop]: trace histogram [1597, 1597, 1291, 798, 798, 798, 798, 798, 798, 798, 493, 306, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:35,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:35,945 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:35,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:35,950 INFO L82 PathProgramCache]: Analyzing trace with hash 803993713, now seen corresponding path program 12 times [2020-07-20 11:11:35,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:35,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320454511] [2020-07-20 11:11:35,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:39,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:40,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 24159 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:11:40,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:12:21,341 INFO L134 CoverageAnalysis]: Checked inductivity of 7202331 backedges. 10911 proven. 105561 refuted. 0 times theorem prover too weak. 7085859 trivial. 0 not checked. [2020-07-20 11:12:21,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:12:34,695 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:34,800 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:34,913 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:35,023 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:35,135 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 11:13:26,749 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:27,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:27,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts