/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_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:53:28,558 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:53:28,561 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:53:28,582 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:53:28,582 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:53:28,585 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:53:28,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:53:28,597 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:53:28,599 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:53:28,602 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:53:28,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:53:28,608 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:53:28,608 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:53:28,610 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:53:28,613 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:53:28,614 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:53:28,615 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:53:28,617 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:53:28,619 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:53:28,623 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:53:28,627 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:53:28,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:53:28,633 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:53:28,635 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:53:28,638 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:53:28,650 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:53:28,651 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:53:28,653 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:53:28,654 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 10:53:28,683 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:53:28,684 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:53:28,686 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:53:28,687 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:53:28,687 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:53:28,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:53:28,688 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:53:28,688 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:53:28,688 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:53:28,688 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:53:28,689 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:53:28,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:53:28,690 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:53:28,690 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:53:28,691 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:53:28,691 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:53:28,691 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:53:28,691 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:53:28,691 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:53:28,692 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:53:28,692 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:53:28,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:53:28,692 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:53:28,693 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:53:28,693 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:53:28,693 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:53:28,693 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:28,693 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:53:28,694 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:53:28,694 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 10:53:29,071 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:53:29,085 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:53:29,089 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:53:29,091 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:53:29,092 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:53:29,093 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 10:53:29,183 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38816ceb4/479a500d1401496c85ef036ed304bf60/FLAGafed92aad [2020-07-20 10:53:29,718 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:53:29,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 10:53:29,727 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38816ceb4/479a500d1401496c85ef036ed304bf60/FLAGafed92aad [2020-07-20 10:53:30,078 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38816ceb4/479a500d1401496c85ef036ed304bf60 [2020-07-20 10:53:30,087 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 10:53:30,090 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 10:53:30,091 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 10:53:30,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 10:53:30,095 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 10:53:30,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,100 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f29f361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30, skipping insertion in model container [2020-07-20 10:53:30,100 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,109 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 10:53:30,133 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 10:53:30,330 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:53:30,334 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 10:53:30,351 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:53:30,367 INFO L208 MainTranslator]: Completed translation [2020-07-20 10:53:30,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30 WrapperNode [2020-07-20 10:53:30,368 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 10:53:30,369 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 10:53:30,369 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 10:53:30,369 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 10:53:30,380 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,387 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,390 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,392 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,393 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (1/1) ... [2020-07-20 10:53:30,394 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 10:53:30,395 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 10:53:30,395 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 10:53:30,395 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 10:53:30,396 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (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 10:53:30,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 10:53:30,570 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 10:53:30,570 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 10:53:30,570 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 10:53:30,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 10:53:30,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 10:53:30,570 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 10:53:30,570 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 10:53:30,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 10:53:30,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 10:53:30,755 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 10:53:30,756 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 10:53:30,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:53:30 BoogieIcfgContainer [2020-07-20 10:53:30,761 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 10:53:30,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 10:53:30,764 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 10:53:30,768 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 10:53:30,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:53:30" (1/3) ... [2020-07-20 10:53:30,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d9ee429 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:53:30, skipping insertion in model container [2020-07-20 10:53:30,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:53:30" (2/3) ... [2020-07-20 10:53:30,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d9ee429 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:53:30, skipping insertion in model container [2020-07-20 10:53:30,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:53:30" (3/3) ... [2020-07-20 10:53:30,773 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-20 10:53:30,787 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 10:53:30,796 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 10:53:30,814 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 10:53:30,845 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 10:53:30,845 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 10:53:30,845 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 10:53:30,846 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 10:53:30,846 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 10:53:30,846 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 10:53:30,848 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 10:53:30,849 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 10:53:30,883 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 10:53:30,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 10:53:30,902 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:30,904 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:53:30,905 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:30,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:30,920 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 10:53:30,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:30,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287019900] [2020-07-20 10:53:30,932 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 10:53:31,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:31,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:53:31,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:31,111 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 10:53:31,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:53:31,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287019900] [2020-07-20 10:53:31,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:53:31,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:53:31,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807258309] [2020-07-20 10:53:31,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:53:31,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:31,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:53:31,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:53:31,139 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 10:53:31,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:31,266 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 10:53:31,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:53:31,269 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 10:53:31,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:31,280 INFO L225 Difference]: With dead ends: 35 [2020-07-20 10:53:31,281 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 10:53:31,285 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 10:53:31,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 10:53:31,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 10:53:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 10:53:31,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 10:53:31,335 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 10:53:31,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:31,335 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 10:53:31,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:53:31,336 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 10:53:31,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 10:53:31,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:31,338 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:53:31,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:31,554 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:31,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:31,555 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 10:53:31,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:31,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880377631] [2020-07-20 10:53:31,557 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) [2020-07-20 10:53:31,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:31,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:53:31,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:31,616 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 10:53:31,617 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:53:31,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880377631] [2020-07-20 10:53:31,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:53:31,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:53:31,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173751929] [2020-07-20 10:53:31,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:53:31,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:31,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:53:31,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:53:31,621 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 10:53:31,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:31,708 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 10:53:31,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:53:31,709 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 10:53:31,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:31,710 INFO L225 Difference]: With dead ends: 27 [2020-07-20 10:53:31,711 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 10:53:31,712 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 10:53:31,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 10:53:31,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 10:53:31,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 10:53:31,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 10:53:31,722 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 10:53:31,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:31,722 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 10:53:31,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:53:31,723 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 10:53:31,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 10:53:31,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:31,725 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 10:53:31,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:31,940 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:31,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:31,941 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 10:53:31,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:31,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177171554] [2020-07-20 10:53:31,943 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 10:53:31,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:31,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 10:53:31,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:32,059 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 10:53:32,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:32,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:32,362 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 10:53:32,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177171554] [2020-07-20 10:53:32,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:32,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 10:53:32,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967595381] [2020-07-20 10:53:32,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:53:32,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:32,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:53:32,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:53:32,367 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 10:53:32,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:32,496 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 10:53:32,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:53:32,497 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 10:53:32,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:32,499 INFO L225 Difference]: With dead ends: 32 [2020-07-20 10:53:32,499 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 10:53:32,500 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 10:53:32,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 10:53:32,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 10:53:32,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 10:53:32,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 10:53:32,510 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 10:53:32,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:32,510 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 10:53:32,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:53:32,511 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 10:53:32,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 10:53:32,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:32,513 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 10:53:32,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:32,728 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:32,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:32,729 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 10:53:32,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:32,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606762726] [2020-07-20 10:53:32,731 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 10:53:32,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:32,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 10:53:32,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:32,817 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 10:53:32,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:32,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:33,000 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 10:53:33,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606762726] [2020-07-20 10:53:33,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:33,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 10:53:33,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913314242] [2020-07-20 10:53:33,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:53:33,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:33,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:53:33,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:53:33,004 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 10:53:33,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:33,095 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 10:53:33,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:53:33,096 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 10:53:33,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:33,099 INFO L225 Difference]: With dead ends: 37 [2020-07-20 10:53:33,099 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 10:53:33,100 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 10:53:33,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 10:53:33,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 10:53:33,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 10:53:33,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 10:53:33,110 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 10:53:33,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:33,111 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 10:53:33,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:53:33,111 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 10:53:33,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 10:53:33,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:33,113 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 10:53:33,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:33,329 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:33,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:33,330 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 10:53:33,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:33,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33838260] [2020-07-20 10:53:33,332 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 10:53:33,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:33,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 10:53:33,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:33,441 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 10:53:33,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:33,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:33,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:33,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:33,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:33,816 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 10:53:33,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33838260] [2020-07-20 10:53:33,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:33,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 10:53:33,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947866581] [2020-07-20 10:53:33,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 10:53:33,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:33,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 10:53:33,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 10:53:33,820 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 10:53:34,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:34,013 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 10:53:34,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 10:53:34,016 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 10:53:34,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:34,019 INFO L225 Difference]: With dead ends: 42 [2020-07-20 10:53:34,019 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 10:53:34,022 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 10:53:34,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 10:53:34,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 10:53:34,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:53:34,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 10:53:34,034 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 10:53:34,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:34,035 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 10:53:34,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 10:53:34,035 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 10:53:34,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 10:53:34,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:34,038 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 10:53:34,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:34,244 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:34,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:34,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 10:53:34,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:34,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628315577] [2020-07-20 10:53:34,246 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 10:53:34,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:34,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 10:53:34,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:34,329 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 10:53:34,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:34,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:34,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:34,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:34,659 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 10:53:34,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628315577] [2020-07-20 10:53:34,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:34,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 10:53:34,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53485318] [2020-07-20 10:53:34,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 10:53:34,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:34,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 10:53:34,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 10:53:34,670 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 10:53:34,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:34,823 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 10:53:34,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 10:53:34,824 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 10:53:34,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:34,830 INFO L225 Difference]: With dead ends: 47 [2020-07-20 10:53:34,830 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 10:53:34,834 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 10:53:34,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 10:53:34,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 10:53:34,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:53:34,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 10:53:34,860 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 10:53:34,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:34,860 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 10:53:34,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 10:53:34,861 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 10:53:34,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 10:53:34,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:34,868 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 10:53:35,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:35,070 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:35,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:35,071 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 10:53:35,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:35,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744603014] [2020-07-20 10:53:35,072 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 10:53:35,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:35,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 10:53:35,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:35,187 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 10:53:35,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:35,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:35,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:35,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:35,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:35,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:35,821 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 10:53:35,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744603014] [2020-07-20 10:53:35,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:35,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 10:53:35,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706473995] [2020-07-20 10:53:35,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 10:53:35,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:35,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 10:53:35,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 10:53:35,825 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 10:53:36,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:36,022 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 10:53:36,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 10:53:36,022 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 10:53:36,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:36,026 INFO L225 Difference]: With dead ends: 52 [2020-07-20 10:53:36,027 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 10:53:36,031 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 10:53:36,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 10:53:36,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 10:53:36,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 10:53:36,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 10:53:36,059 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 10:53:36,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:36,060 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 10:53:36,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 10:53:36,060 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 10:53:36,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 10:53:36,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:36,073 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 10:53:36,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:36,274 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:36,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:36,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 10:53:36,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:36,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082529124] [2020-07-20 10:53:36,277 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 10:53:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:36,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 10:53:36,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:36,423 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 10:53:36,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:36,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:36,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:36,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:37,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:37,100 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 10:53:37,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082529124] [2020-07-20 10:53:37,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:37,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 10:53:37,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693349250] [2020-07-20 10:53:37,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 10:53:37,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:37,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 10:53:37,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 10:53:37,103 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 10:53:37,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:37,255 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 10:53:37,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 10:53:37,257 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 10:53:37,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:37,260 INFO L225 Difference]: With dead ends: 57 [2020-07-20 10:53:37,260 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 10:53:37,266 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 10:53:37,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 10:53:37,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 10:53:37,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 10:53:37,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 10:53:37,291 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 10:53:37,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:37,293 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 10:53:37,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 10:53:37,293 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 10:53:37,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 10:53:37,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:37,296 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 10:53:37,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:37,497 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:37,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:37,498 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 10:53:37,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:37,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106791687] [2020-07-20 10:53:37,499 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 10:53:37,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:37,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 10:53:37,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:37,655 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 10:53:37,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:38,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:38,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:38,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:38,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:38,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:38,657 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 10:53:38,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106791687] [2020-07-20 10:53:38,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:38,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 10:53:38,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648483187] [2020-07-20 10:53:38,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:53:38,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:38,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:53:38,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 10:53:38,660 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 10:53:38,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:38,972 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 10:53:38,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:53:38,973 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 10:53:38,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:38,976 INFO L225 Difference]: With dead ends: 62 [2020-07-20 10:53:38,976 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 10:53:38,978 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 10:53:38,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 10:53:38,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 10:53:38,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 10:53:38,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 10:53:38,995 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 10:53:38,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:38,996 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 10:53:38,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:53:38,997 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 10:53:39,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 10:53:39,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:39,002 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 10:53:39,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:39,215 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:39,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:39,216 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 10:53:39,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:39,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086302834] [2020-07-20 10:53:39,216 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 10:53:39,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:39,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 10:53:39,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:39,418 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 10:53:39,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:40,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:40,579 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 10:53:40,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086302834] [2020-07-20 10:53:40,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:40,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 10:53:40,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867029817] [2020-07-20 10:53:40,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:53:40,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:40,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:53:40,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 10:53:40,582 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 10:53:40,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:40,748 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 10:53:40,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:53:40,749 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 10:53:40,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:40,752 INFO L225 Difference]: With dead ends: 67 [2020-07-20 10:53:40,752 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 10:53:40,754 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 10:53:40,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 10:53:40,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 10:53:40,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 10:53:40,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 10:53:40,766 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 10:53:40,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:40,767 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 10:53:40,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:53:40,767 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 10:53:40,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 10:53:40,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:40,772 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 10:53:40,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:40,985 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:40,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:40,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 10:53:40,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:40,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27517535] [2020-07-20 10:53:40,987 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 10:53:41,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:41,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 10:53:41,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:41,248 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 10:53:41,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:42,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:42,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:42,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:43,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:43,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:43,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:43,229 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 10:53:43,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27517535] [2020-07-20 10:53:43,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:43,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 10:53:43,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197849172] [2020-07-20 10:53:43,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 10:53:43,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:43,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 10:53:43,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 10:53:43,242 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 10:53:43,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:43,482 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 10:53:43,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 10:53:43,483 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 10:53:43,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:43,487 INFO L225 Difference]: With dead ends: 72 [2020-07-20 10:53:43,487 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 10:53:43,488 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 10:53:43,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 10:53:43,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 10:53:43,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 10:53:43,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 10:53:43,519 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 10:53:43,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:43,520 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 10:53:43,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 10:53:43,521 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 10:53:43,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 10:53:43,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:43,528 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 10:53:43,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:43,742 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:43,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:43,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 10:53:43,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:43,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1787458339] [2020-07-20 10:53:43,744 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 10:53:43,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:43,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 10:53:43,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:43,993 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 10:53:43,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:45,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:45,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:45,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:45,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:45,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:45,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:46,040 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 10:53:46,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1787458339] [2020-07-20 10:53:46,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:46,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 10:53:46,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234995686] [2020-07-20 10:53:46,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 10:53:46,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:46,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 10:53:46,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 10:53:46,043 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 10:53:46,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:46,266 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 10:53:46,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 10:53:46,267 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 10:53:46,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:46,270 INFO L225 Difference]: With dead ends: 77 [2020-07-20 10:53:46,271 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 10:53:46,272 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 10:53:46,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 10:53:46,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 10:53:46,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 10:53:46,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 10:53:46,285 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 10:53:46,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:46,286 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 10:53:46,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 10:53:46,286 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 10:53:46,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 10:53:46,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:46,299 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 10:53:46,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:46,513 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:46,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:46,514 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 10:53:46,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:46,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834364149] [2020-07-20 10:53:46,514 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 10:53:46,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:46,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 10:53:46,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:46,999 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 10:53:46,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:49,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:49,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:49,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:50,540 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 10:53:50,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834364149] [2020-07-20 10:53:50,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:50,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 10:53:50,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851426314] [2020-07-20 10:53:50,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 10:53:50,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:50,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 10:53:50,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 10:53:50,543 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 10:53:51,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:51,009 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 10:53:51,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 10:53:51,010 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 10:53:51,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:51,013 INFO L225 Difference]: With dead ends: 82 [2020-07-20 10:53:51,014 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 10:53:51,015 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 10:53:51,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 10:53:51,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 10:53:51,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 10:53:51,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 10:53:51,029 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 10:53:51,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:51,030 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 10:53:51,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 10:53:51,030 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 10:53:51,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 10:53:51,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:51,034 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 10:53:51,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:51,249 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:51,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:51,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 10:53:51,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:51,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254825659] [2020-07-20 10:53:51,250 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 10:53:51,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:51,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 10:53:51,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:51,665 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 10:53:51,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:53,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:54,858 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 10:53:54,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254825659] [2020-07-20 10:53:54,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:54,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 10:53:54,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819010533] [2020-07-20 10:53:54,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 10:53:54,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:54,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 10:53:54,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 10:53:54,861 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 10:53:55,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:55,164 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 10:53:55,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 10:53:55,165 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 10:53:55,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:55,169 INFO L225 Difference]: With dead ends: 87 [2020-07-20 10:53:55,169 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 10:53:55,172 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 10:53:55,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 10:53:55,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 10:53:55,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 10:53:55,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 10:53:55,212 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 10:53:55,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:55,213 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 10:53:55,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 10:53:55,213 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 10:53:55,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 10:53:55,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:55,236 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 10:53:55,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:55,440 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:55,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:55,442 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 10:53:55,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:55,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401579217] [2020-07-20 10:53:55,443 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 10:53:55,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:55,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 10:53:55,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:56,551 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 10:53:56,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:00,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:00,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:01,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:02,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:03,456 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 10:54:03,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401579217] [2020-07-20 10:54:03,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:03,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 10:54:03,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109382136] [2020-07-20 10:54:03,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 10:54:03,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:03,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 10:54:03,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 10:54:03,460 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 10:54:04,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:04,105 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 10:54:04,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:54:04,106 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 10:54:04,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:04,113 INFO L225 Difference]: With dead ends: 92 [2020-07-20 10:54:04,113 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 10:54:04,118 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 10:54:04,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 10:54:04,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 10:54:04,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 10:54:04,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 10:54:04,172 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 10:54:04,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:04,174 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 10:54:04,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 10:54:04,176 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 10:54:04,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-20 10:54:04,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:04,185 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 10:54:04,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:04,399 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:04,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:04,400 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-20 10:54:04,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:04,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556887583] [2020-07-20 10:54:04,401 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 10:54:04,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:04,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 1548 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 10:54:04,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:05,066 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 10:54:05,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:07,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:07,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:08,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:09,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:10,610 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 10:54:10,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556887583] [2020-07-20 10:54:10,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:10,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 10:54:10,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707239973] [2020-07-20 10:54:10,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 10:54:10,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:10,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 10:54:10,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 10:54:10,615 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 10:54:11,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:11,278 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 10:54:11,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:54:11,286 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-20 10:54:11,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:11,291 INFO L225 Difference]: With dead ends: 97 [2020-07-20 10:54:11,291 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 10:54:11,292 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 10:54:11,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 10:54:11,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 10:54:11,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 10:54:11,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 10:54:11,306 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-20 10:54:11,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:11,308 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 10:54:11,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 10:54:11,308 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 10:54:11,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-20 10:54:11,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:11,344 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 10:54:11,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:11,559 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:11,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:11,560 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-20 10:54:11,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:11,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072355202] [2020-07-20 10:54:11,560 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 10:54:12,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:12,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 4351 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:54:12,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:13,968 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 10:54:13,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:19,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:22,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:24,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:25,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:27,525 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 10:54:27,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072355202] [2020-07-20 10:54:27,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:27,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 10:54:27,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418062360] [2020-07-20 10:54:27,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 10:54:27,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:27,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 10:54:27,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 10:54:27,529 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 10:54:27,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:27,973 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 10:54:27,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:54:27,974 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-20 10:54:27,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:27,980 INFO L225 Difference]: With dead ends: 102 [2020-07-20 10:54:27,981 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 10:54:27,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 10:54:27,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 10:54:27,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 10:54:27,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 10:54:27,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 10:54:27,998 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-20 10:54:28,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:28,000 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 10:54:28,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 10:54:28,001 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 10:54:28,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-20 10:54:28,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:28,021 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 10:54:28,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:28,236 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:28,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:28,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-20 10:54:28,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:28,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121370461] [2020-07-20 10:54:28,238 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 10:54:28,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:28,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 3004 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:54:28,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:29,764 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 10:54:29,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:34,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:37,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:37,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:39,711 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 10:54:39,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121370461] [2020-07-20 10:54:39,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:39,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 10:54:39,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648064812] [2020-07-20 10:54:39,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 10:54:39,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:39,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 10:54:39,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 10:54:39,716 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 10:54:40,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:40,329 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 10:54:40,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:54:40,330 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-20 10:54:40,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:40,336 INFO L225 Difference]: With dead ends: 107 [2020-07-20 10:54:40,336 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 10:54:40,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 10:54:40,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 10:54:40,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 10:54:40,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 10:54:40,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 10:54:40,354 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-20 10:54:40,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:40,356 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 10:54:40,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 10:54:40,356 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 10:54:40,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-20 10:54:40,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:40,425 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 10:54:40,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:40,626 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:40,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:40,627 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-20 10:54:40,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:40,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642124027] [2020-07-20 10:54:40,628 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 10:54:41,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:41,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 6091 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:54:41,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:45,710 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 10:54:45,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:54,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:59,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:02,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:03,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:03,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:03,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:03,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:04,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:04,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:04,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:04,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:04,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:07,622 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 10:55:07,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642124027] [2020-07-20 10:55:07,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:55:07,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 10:55:07,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843889136] [2020-07-20 10:55:07,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 10:55:07,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:07,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 10:55:07,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 10:55:07,627 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 10:55:08,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:08,594 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 10:55:08,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:55:08,595 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-20 10:55:08,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:08,603 INFO L225 Difference]: With dead ends: 112 [2020-07-20 10:55:08,603 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 10:55:08,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 10:55:08,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 10:55:08,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 10:55:08,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 10:55:08,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 10:55:08,624 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-20 10:55:08,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:08,627 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 10:55:08,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 10:55:08,627 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 10:55:08,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2865 [2020-07-20 10:55:08,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:08,716 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 343, 209, 209, 209, 209, 209, 209, 209, 134, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:08,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:08,931 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:08,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:08,934 INFO L82 PathProgramCache]: Analyzing trace with hash 565204626, now seen corresponding path program 9 times [2020-07-20 10:55:08,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:08,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590000417] [2020-07-20 10:55:08,938 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 10:55:10,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:10,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 6359 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:55:10,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:13,349 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20214 refuted. 0 times theorem prover too weak. 472883 trivial. 0 not checked. [2020-07-20 10:55:13,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:55:22,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:28,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:31,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:32,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:32,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:32,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:33,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:33,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:33,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:33,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:36,266 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20340 refuted. 0 times theorem prover too weak. 472757 trivial. 0 not checked. [2020-07-20 10:55:36,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590000417] [2020-07-20 10:55:36,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:55:36,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 10:55:36,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702284560] [2020-07-20 10:55:36,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 10:55:36,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:36,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 10:55:36,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 10:55:36,271 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 10:55:37,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:37,279 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 10:55:37,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:55:37,280 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2864 [2020-07-20 10:55:37,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:37,288 INFO L225 Difference]: With dead ends: 117 [2020-07-20 10:55:37,289 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 10:55:37,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5737 GetRequests, 5684 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 10:55:37,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 10:55:37,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 10:55:37,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 10:55:37,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 10:55:37,310 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2864 [2020-07-20 10:55:37,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:37,312 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 10:55:37,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 10:55:37,312 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 10:55:37,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 10:55:37,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:37,428 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:37,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:37,630 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:37,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:37,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-20 10:55:37,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:37,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343696606] [2020-07-20 10:55:37,633 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 10:55:39,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:39,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 8875 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 10:55:39,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:45,408 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-20 10:55:45,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:00,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:00,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:08,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:11,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:13,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:14,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:15,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:15,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:15,720 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 10:56:15,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:15,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:16,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:16,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:22,399 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-20 10:56:22,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343696606] [2020-07-20 10:56:22,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:56:22,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 10:56:22,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61051904] [2020-07-20 10:56:22,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 10:56:22,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:56:22,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 10:56:22,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 10:56:22,405 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 10:56:23,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:56:23,563 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 10:56:23,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 10:56:23,564 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 10:56:23,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:56:23,572 INFO L225 Difference]: With dead ends: 122 [2020-07-20 10:56:23,573 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 10:56:23,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 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 10:56:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 10:56:23,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 10:56:23,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 10:56:23,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 10:56:23,598 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 10:56:23,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:56:23,601 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 10:56:23,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 10:56:23,601 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 10:56:23,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5062 [2020-07-20 10:56:23,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:56:23,780 INFO L422 BasicCegarLoop]: trace histogram [737, 737, 632, 368, 368, 368, 368, 368, 368, 368, 264, 105, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:56:23,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:23,994 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:56:23,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:56:23,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1250597211, now seen corresponding path program 10 times [2020-07-20 10:56:23,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:56:23,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597110117] [2020-07-20 10:56:23,998 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 10:56:25,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:56:25,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 11230 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 10:56:26,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:56:35,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40185 refuted. 0 times theorem prover too weak. 1509018 trivial. 0 not checked. [2020-07-20 10:56:35,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:52,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:02,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:02,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:10,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:10,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:11,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:11,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:12,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:12,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:13,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40340 refuted. 0 times theorem prover too weak. 1508863 trivial. 0 not checked. [2020-07-20 10:57:22,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597110117] [2020-07-20 10:57:22,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:57:22,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 10:57:22,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568523656] [2020-07-20 10:57:22,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 10:57:22,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:57:22,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 10:57:22,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 10:57:22,766 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 10:57:24,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:57:24,328 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 10:57:24,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 10:57:24,331 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5061 [2020-07-20 10:57:24,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:57:24,341 INFO L225 Difference]: With dead ends: 127 [2020-07-20 10:57:24,342 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 10:57:24,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10132 GetRequests, 10074 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 10:57:24,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 10:57:24,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 10:57:24,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 10:57:24,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 10:57:24,369 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5061 [2020-07-20 10:57:24,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:57:24,373 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 10:57:24,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 10:57:24,373 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 10:57:24,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9010 [2020-07-20 10:57:24,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:57:24,854 INFO L422 BasicCegarLoop]: trace histogram [1385, 1385, 693, 692, 692, 692, 692, 692, 692, 692, 692, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:57:25,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:25,056 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:57:25,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:57:25,059 INFO L82 PathProgramCache]: Analyzing trace with hash 2053065637, now seen corresponding path program 11 times [2020-07-20 10:57:25,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:57:25,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256537021] [2020-07-20 10:57:25,060 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 10:57:28,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:57:28,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 20098 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 10:57:28,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:57:56,581 INFO L134 CoverageAnalysis]: Checked inductivity of 5029110 backedges. 9830 proven. 77350 refuted. 0 times theorem prover too weak. 4941930 trivial. 0 not checked. [2020-07-20 10:57:56,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:58:25,558 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 10:58:30,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:53,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:04,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:04,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:08,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:08,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:11,325 WARN L193 SmtUtils]: Spent 915.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 10:59:13,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:14,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:14,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:15,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:15,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:15,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:16,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:16,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:16,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:16,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:44,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5029110 backedges. 9830 proven. 77526 refuted. 0 times theorem prover too weak. 4941754 trivial. 0 not checked. [2020-07-20 10:59:44,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256537021] [2020-07-20 10:59:44,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:59:44,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 10:59:44,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151155557] [2020-07-20 10:59:44,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 10:59:44,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:59:44,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 10:59:44,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 10:59:44,117 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 10:59:45,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:59:45,988 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 10:59:45,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 10:59:45,990 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9009 [2020-07-20 10:59:45,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:59:46,000 INFO L225 Difference]: With dead ends: 132 [2020-07-20 10:59:46,001 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 10:59:46,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18030 GetRequests, 17967 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 10:59:46,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 10:59:46,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 10:59:46,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 10:59:46,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 10:59:46,029 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9009 [2020-07-20 10:59:46,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:59:46,035 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 10:59:46,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 10:59:46,036 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 10:59:46,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6733 [2020-07-20 10:59:46,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:59:46,548 INFO L422 BasicCegarLoop]: trace histogram [989, 989, 791, 494, 494, 494, 494, 494, 494, 494, 297, 198, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:59:46,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:46,761 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:59:46,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:59:46,763 INFO L82 PathProgramCache]: Analyzing trace with hash -2146077945, now seen corresponding path program 11 times [2020-07-20 10:59:46,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:59:46,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551076419] [2020-07-20 10:59:46,765 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 10:59:49,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:59:49,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 14950 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 10:59:49,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:05,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2753793 backedges. 6859 proven. 59210 refuted. 0 times theorem prover too weak. 2687724 trivial. 0 not checked. [2020-07-20 11:00:05,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:41,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:41,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,946 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:01:02,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:02,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:14,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2753793 backedges. 6859 proven. 59397 refuted. 0 times theorem prover too weak. 2687537 trivial. 0 not checked. [2020-07-20 11:01:31,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551076419] [2020-07-20 11:01:31,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:31,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:01:31,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642328514] [2020-07-20 11:01:31,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:01:31,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:31,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:01:31,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:01:31,918 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 11:01:33,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:33,666 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 11:01:33,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:01:33,668 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6732 [2020-07-20 11:01:33,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:33,680 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:01:33,681 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:01:33,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13475 GetRequests, 13412 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:01:33,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:01:33,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 11:01:33,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:01:33,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:01:33,716 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6732 [2020-07-20 11:01:33,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:33,719 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:01:33,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:01:33,719 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:01:35,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-20 11:01:35,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:35,270 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 11:01:35,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:35,472 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:35,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:35,477 INFO L82 PathProgramCache]: Analyzing trace with hash 904472140, now seen corresponding path program 12 times [2020-07-20 11:01:35,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:35,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686207906] [2020-07-20 11:01:35,478 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 11:01:40,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:40,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 28189 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:01:40,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:27,785 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 11:02:27,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:36,740 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:02:42,619 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:02:42,729 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:02:42,843 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:02:42,959 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:02:43,082 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 11:02:43,184 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 11:03:52,819 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:03:52,928 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:03:53,050 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:03:53,164 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:03:53,277 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 11:03:53,383 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 11:03:53,488 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:03:53,590 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 11:03:54,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,608 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:04:36,718 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:04:36,839 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:04:36,949 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:04:39,745 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 11:04:40,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:40,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:03,051 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:05:03,160 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:05:05,886 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:05:05,997 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:05:06,117 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:05:06,233 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:05:06,348 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 11:05:06,459 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:05:06,562 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 11:05:07,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:07,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:26,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:32,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:40,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:44,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:47,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:48,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:48,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:48,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:46,875 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 11:06:46,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686207906] [2020-07-20 11:06:46,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:46,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 11:06:46,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902914901] [2020-07-20 11:06:46,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 11:06:46,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:46,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 11:06:46,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 11:06:46,883 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states.