/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_20-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:00:13,703 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 11:00:13,731 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:00:13,735 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:00:13,737 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:00:13,751 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:00:13,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:00:13,760 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:00:13,762 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:00:13,765 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:00:13,766 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:00:13,770 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:00:13,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:00:13,775 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:00:13,777 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:00:13,778 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:00:13,781 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:00:13,787 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:00:13,795 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:00:13,800 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:00:13,801 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:00:13,802 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:00:13,806 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:00:13,820 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:00:13,821 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:00:13,823 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:00:13,824 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:00:13,868 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:00:13,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:00:13,873 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:00:13,874 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:00:13,874 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:00:13,874 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:00:13,874 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:00:13,875 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:00:13,875 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:00:13,875 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:00:13,875 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:00:13,878 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:00:13,879 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:00:13,879 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:00:13,879 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:00:13,879 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:00:13,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:13,880 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:00:13,880 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:00:13,882 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:00:13,882 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:00:13,882 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:13,883 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:00:13,883 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:00:13,883 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:00:14,279 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:00:14,303 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:00:14,307 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:00:14,308 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:00:14,309 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:00:14,309 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 11:00:14,393 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7cea47266/91564597c1174b37be8e4363e7c3b59d/FLAGb842dcdc9 [2020-07-20 11:00:14,897 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:00:14,898 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 11:00:14,907 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7cea47266/91564597c1174b37be8e4363e7c3b59d/FLAGb842dcdc9 [2020-07-20 11:00:15,235 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7cea47266/91564597c1174b37be8e4363e7c3b59d [2020-07-20 11:00:15,246 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:15,250 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:15,251 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:15,251 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:15,256 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:15,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,261 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70edd8d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15, skipping insertion in model container [2020-07-20 11:00:15,262 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,272 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:15,296 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:15,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:15,555 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:15,574 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:15,587 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:15,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15 WrapperNode [2020-07-20 11:00:15,588 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:15,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:15,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:15,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:15,602 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,603 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,609 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,609 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,614 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,617 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,618 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... [2020-07-20 11:00:15,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:15,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:15,621 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:15,621 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:15,622 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:15,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:15,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:15,781 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 11:00:15,781 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:15,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:15,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:15,782 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 11:00:15,782 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:15,782 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:15,782 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:15,989 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:15,989 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:15,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:15 BoogieIcfgContainer [2020-07-20 11:00:15,995 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:15,996 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:15,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:16,000 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:16,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:15" (1/3) ... [2020-07-20 11:00:16,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6873fff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:16, skipping insertion in model container [2020-07-20 11:00:16,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:15" (2/3) ... [2020-07-20 11:00:16,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6873fff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:16, skipping insertion in model container [2020-07-20 11:00:16,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:15" (3/3) ... [2020-07-20 11:00:16,005 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-1.c [2020-07-20 11:00:16,016 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:16,024 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:16,043 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:16,073 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:16,074 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:16,074 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:16,074 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:16,074 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:16,074 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:16,075 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:16,075 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:16,094 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 11:00:16,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:16,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:16,103 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:16,104 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:16,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:16,110 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 11:00:16,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:16,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318652125] [2020-07-20 11:00:16,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:16,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:16,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:16,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:16,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:16,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:16,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318652125] [2020-07-20 11:00:16,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:16,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:16,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835487907] [2020-07-20 11:00:16,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:16,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:16,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:16,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:16,411 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 11:00:16,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:16,576 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:00:16,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:16,578 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:16,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:16,592 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:00:16,592 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:00:16,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:16,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:00:16,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:00:16,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:16,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:16,659 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 11:00:16,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:16,660 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:16,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:16,660 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:16,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:16,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:16,664 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:16,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:16,881 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:16,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:16,883 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 11:00:16,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:16,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013385013] [2020-07-20 11:00:16,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:16,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:16,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:16,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:16,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:16,976 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:16,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013385013] [2020-07-20 11:00:16,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:16,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:16,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78629601] [2020-07-20 11:00:16,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:16,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:16,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:16,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:16,986 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 11:00:17,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:17,127 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 11:00:17,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:17,130 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:17,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:17,132 INFO L225 Difference]: With dead ends: 27 [2020-07-20 11:00:17,134 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:00:17,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:17,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:00:17,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 11:00:17,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:17,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:17,164 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 11:00:17,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:17,165 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:17,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:17,165 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:17,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:17,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:17,173 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:17,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:17,388 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:17,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:17,389 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 11:00:17,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:17,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498219599] [2020-07-20 11:00:17,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:17,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:17,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:17,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:17,511 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:17,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:17,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:17,806 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:17,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498219599] [2020-07-20 11:00:17,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:17,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:17,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745754168] [2020-07-20 11:00:17,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:17,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:17,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:17,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:17,812 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 11:00:17,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:17,981 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 11:00:17,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:17,982 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 11:00:17,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:17,985 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:00:17,985 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:00:17,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:17,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:00:17,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 11:00:17,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:17,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:17,999 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 11:00:17,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:17,999 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:17,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:18,000 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:18,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:18,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:18,002 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:18,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:18,216 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:18,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:18,218 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 11:00:18,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:18,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006634253] [2020-07-20 11:00:18,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:18,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:18,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:18,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:18,310 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:00:18,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:18,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:18,544 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:18,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006634253] [2020-07-20 11:00:18,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:18,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:18,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93831695] [2020-07-20 11:00:18,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:18,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:18,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:18,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:18,548 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 11:00:18,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:18,677 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 11:00:18,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:18,678 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 11:00:18,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:18,681 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:00:18,681 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:00:18,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:18,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:00:18,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 11:00:18,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:18,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:18,694 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 11:00:18,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:18,695 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:18,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:18,696 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:18,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:18,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:18,698 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:18,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:18,915 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:18,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:18,916 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 11:00:18,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:18,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866137526] [2020-07-20 11:00:18,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:18,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:18,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:18,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:19,029 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 11:00:19,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:19,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,462 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:19,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866137526] [2020-07-20 11:00:19,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:19,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:19,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834617308] [2020-07-20 11:00:19,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:19,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:19,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:19,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:19,468 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 11:00:19,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:19,679 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 11:00:19,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:19,683 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 11:00:19,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:19,685 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:00:19,685 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:00:19,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:19,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:00:19,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 11:00:19,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:19,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:19,699 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 11:00:19,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:19,700 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:19,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:19,701 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:19,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 11:00:19,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:19,704 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:19,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:19,915 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:19,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:19,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 11:00:19,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:19,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134781901] [2020-07-20 11:00:19,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:19,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:19,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:19,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:20,025 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 11:00:20,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:20,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:20,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134781901] [2020-07-20 11:00:20,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:20,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:20,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379183512] [2020-07-20 11:00:20,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:20,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:20,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:20,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:20,369 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 11:00:20,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:20,513 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 11:00:20,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:20,513 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 11:00:20,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:20,516 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:00:20,516 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 11:00:20,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:20,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 11:00:20,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 11:00:20,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:20,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:20,528 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 11:00:20,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:20,528 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:20,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:20,528 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:20,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:00:20,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:20,530 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:20,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:20,745 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:20,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:20,745 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 11:00:20,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:20,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977113106] [2020-07-20 11:00:20,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:20,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:20,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:20,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:20,859 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:00:20,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:21,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:21,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:21,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:21,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:21,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:21,527 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:00:21,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977113106] [2020-07-20 11:00:21,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:21,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:21,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414917521] [2020-07-20 11:00:21,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:21,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:21,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:21,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:21,535 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 11:00:21,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:21,701 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 11:00:21,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:21,701 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 11:00:21,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:21,704 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:00:21,704 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:00:21,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:21,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:00:21,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 11:00:21,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:21,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:21,716 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 11:00:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:21,717 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:21,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:21,718 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:21,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 11:00:21,720 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:21,720 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:21,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,935 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:21,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:21,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 11:00:21,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:21,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119004957] [2020-07-20 11:00:21,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:21,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:21,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:22,067 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 11:00:22,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:22,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:22,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:22,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:22,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:22,647 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 11:00:22,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119004957] [2020-07-20 11:00:22,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:22,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:22,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142645635] [2020-07-20 11:00:22,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:22,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:22,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:22,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:22,653 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 11:00:22,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:22,785 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 11:00:22,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:22,788 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 11:00:22,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:22,790 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:00:22,790 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 11:00:22,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:22,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 11:00:22,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 11:00:22,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:22,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:22,817 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 11:00:22,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:22,818 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:22,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:22,818 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:22,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 11:00:22,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:22,824 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:23,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,025 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:23,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:23,026 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 11:00:23,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:23,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544049113] [2020-07-20 11:00:23,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,178 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 11:00:23,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:23,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:23,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:23,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,187 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 11:00:24,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544049113] [2020-07-20 11:00:24,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:24,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971553782] [2020-07-20 11:00:24,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:24,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:24,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:24,190 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 11:00:24,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,536 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 11:00:24,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:24,537 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 11:00:24,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,540 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:00:24,540 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:00:24,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:24,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:00:24,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 11:00:24,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:24,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:24,556 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 11:00:24,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:24,557 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:24,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:24,557 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:24,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 11:00:24,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,561 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,777 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,778 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 11:00:24,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175509294] [2020-07-20 11:00:24,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 11:00:25,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:25,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 11:00:26,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175509294] [2020-07-20 11:00:26,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:26,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:26,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494209418] [2020-07-20 11:00:26,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:26,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:26,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:26,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:26,219 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 11:00:26,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,399 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 11:00:26,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:26,400 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 11:00:26,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,403 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:00:26,403 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:00:26,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:26,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:00:26,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 11:00:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:26,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:26,418 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 11:00:26,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,419 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:26,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:26,419 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:26,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:00:26,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,424 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:26,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,635 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 11:00:26,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125367061] [2020-07-20 11:00:26,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:26,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 11:00:26,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:28,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 11:00:28,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125367061] [2020-07-20 11:00:28,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:28,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:28,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068227596] [2020-07-20 11:00:28,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:28,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:28,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:28,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:28,975 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 11:00:29,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:29,240 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 11:00:29,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:29,241 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 11:00:29,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:29,246 INFO L225 Difference]: With dead ends: 72 [2020-07-20 11:00:29,246 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 11:00:29,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:29,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 11:00:29,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 11:00:29,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:29,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:29,289 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 11:00:29,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:29,291 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:29,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:29,291 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:29,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 11:00:29,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:29,297 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:29,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,512 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:29,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:29,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 11:00:29,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:29,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14498795] [2020-07-20 11:00:29,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:29,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:29,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:29,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 11:00:29,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:31,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 11:00:32,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14498795] [2020-07-20 11:00:32,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:32,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:32,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351965505] [2020-07-20 11:00:32,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:32,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:32,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:32,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:32,014 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 11:00:32,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:32,284 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 11:00:32,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:32,285 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 11:00:32,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:32,294 INFO L225 Difference]: With dead ends: 77 [2020-07-20 11:00:32,294 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:00:32,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:32,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:00:32,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 11:00:32,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:32,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:32,325 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 11:00:32,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:32,327 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:32,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:32,327 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:32,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 11:00:32,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:32,340 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:32,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,555 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:32,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:32,556 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 11:00:32,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:32,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862145025] [2020-07-20 11:00:32,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:32,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:32,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 11:00:33,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:35,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,494 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 11:00:36,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862145025] [2020-07-20 11:00:36,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:36,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:36,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196937170] [2020-07-20 11:00:36,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:36,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:36,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:36,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:36,497 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 11:00:36,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:36,880 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 11:00:36,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:36,880 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 11:00:36,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:36,885 INFO L225 Difference]: With dead ends: 82 [2020-07-20 11:00:36,886 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:00:36,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:36,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:00:36,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 11:00:36,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:36,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:36,910 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 11:00:36,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:36,913 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:36,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:36,914 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:36,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 11:00:36,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:36,920 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:37,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:37,134 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:37,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:37,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 11:00:37,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:37,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966589612] [2020-07-20 11:00:37,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:37,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:37,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:37,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:37,578 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 11:00:37,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:39,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 11:00:40,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966589612] [2020-07-20 11:00:40,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:40,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:40,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121379112] [2020-07-20 11:00:40,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:40,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:40,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:40,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:40,863 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 11:00:41,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:41,437 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 11:00:41,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:41,438 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 11:00:41,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:41,444 INFO L225 Difference]: With dead ends: 87 [2020-07-20 11:00:41,445 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 11:00:41,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:41,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 11:00:41,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 11:00:41,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:41,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:41,492 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 11:00:41,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:41,494 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:41,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:41,494 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:41,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 11:00:41,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:41,505 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:41,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:41,719 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:41,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:41,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 11:00:41,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:41,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109561810] [2020-07-20 11:00:41,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:42,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:42,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:42,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:42,756 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 11:00:42,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:45,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 11:00:48,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109561810] [2020-07-20 11:00:48,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:48,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:48,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709858205] [2020-07-20 11:00:48,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:48,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:48,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:48,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:48,899 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 11:00:49,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:49,279 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 11:00:49,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:49,280 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 11:00:49,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:49,285 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:00:49,285 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:00:49,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:49,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:00:49,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 11:00:49,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:49,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:49,307 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 11:00:49,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:49,308 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:49,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:49,309 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:49,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-20 11:00:49,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:49,326 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:49,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,540 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:49,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:49,541 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-20 11:00:49,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:49,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196197125] [2020-07-20 11:00:49,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:50,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 2393 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:50,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:50,659 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-20 11:00:50,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:54,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:55,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,511 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-20 11:00:58,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196197125] [2020-07-20 11:00:58,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:58,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:58,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048792125] [2020-07-20 11:00:58,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:58,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:58,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:58,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:58,516 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 11:00:59,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:59,275 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 11:00:59,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:59,277 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-20 11:00:59,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:59,286 INFO L225 Difference]: With dead ends: 97 [2020-07-20 11:00:59,286 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 11:00:59,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:59,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 11:00:59,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 11:00:59,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:59,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:59,316 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-20 11:00:59,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:59,319 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:59,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:59,319 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:59,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-20 11:00:59,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:59,356 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:59,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:59,570 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:59,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:59,571 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-20 11:00:59,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:59,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826330443] [2020-07-20 11:00:59,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:00,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:00,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 3511 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:00,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:01,317 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-20 11:01:01,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:06,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:09,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,117 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-20 11:01:13,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826330443] [2020-07-20 11:01:13,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:13,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:13,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884968694] [2020-07-20 11:01:13,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:13,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:13,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:13,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:13,121 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 11:01:13,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:13,879 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 11:01:13,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:13,879 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-20 11:01:13,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:13,885 INFO L225 Difference]: With dead ends: 102 [2020-07-20 11:01:13,885 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 11:01:13,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 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 11:01:13,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 11:01:13,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 11:01:13,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:13,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:13,902 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-20 11:01:13,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:13,904 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:13,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:13,904 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:13,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 11:01:13,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:13,935 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:14,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:14,148 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:14,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:14,150 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 11:01:14,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:14,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083655757] [2020-07-20 11:01:14,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:14,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:14,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 4091 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:14,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:17,187 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 11:01:17,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:23,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:28,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:28,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:28,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,044 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 11:01:31,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083655757] [2020-07-20 11:01:31,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:31,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:31,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749650892] [2020-07-20 11:01:31,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:31,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:31,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:31,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:31,050 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 11:01:31,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:31,720 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 11:01:31,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:31,721 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 11:01:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:31,728 INFO L225 Difference]: With dead ends: 107 [2020-07-20 11:01:31,728 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 11:01:31,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 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 11:01:31,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 11:01:31,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 11:01:31,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:31,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:31,747 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 11:01:31,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:31,750 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:31,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:31,750 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:31,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-20 11:01:31,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:31,796 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:31,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:31,997 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:31,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:31,999 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-20 11:01:31,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:31,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618703204] [2020-07-20 11:01:32,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:32,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:32,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 4700 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:32,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:34,976 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-20 11:01:34,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:42,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:46,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:48,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:50,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:52,609 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-20 11:01:52,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618703204] [2020-07-20 11:01:52,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:52,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:01:52,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857840002] [2020-07-20 11:01:52,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:52,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:52,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:52,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:52,613 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 11:01:53,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:53,346 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 11:01:53,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:53,347 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-20 11:01:53,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:53,353 INFO L225 Difference]: With dead ends: 112 [2020-07-20 11:01:53,353 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:01:53,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:53,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:01:53,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 11:01:53,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:01:53,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:01:53,372 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-20 11:01:53,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:53,374 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:01:53,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:53,374 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:01:53,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-20 11:01:53,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:53,422 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:53,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:53,636 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:53,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:53,638 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-20 11:01:53,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:53,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990106678] [2020-07-20 11:01:53,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:54,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:54,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 4898 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:54,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:56,253 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-20 11:01:56,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:03,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:09,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:09,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:10,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:10,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:11,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:13,143 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-20 11:02:13,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990106678] [2020-07-20 11:02:13,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:13,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:02:13,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062208734] [2020-07-20 11:02:13,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:13,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:13,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:13,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:13,148 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 11:02:13,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:13,889 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 11:02:13,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:02:13,889 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-20 11:02:13,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:13,896 INFO L225 Difference]: With dead ends: 117 [2020-07-20 11:02:13,896 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 11:02:13,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:13,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 11:02:13,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 11:02:13,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:02:13,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:02:13,918 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-20 11:02:13,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:13,920 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:02:13,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:13,920 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:02:14,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 11:02:14,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:14,080 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 11:02:14,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:14,290 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:14,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:14,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-20 11:02:14,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:14,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304086215] [2020-07-20 11:02:14,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:15,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:15,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 8876 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:02:15,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:20,900 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 11:02:20,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:36,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:36,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:48,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:49,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:49,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:49,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:50,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:50,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:50,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:50,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:55,544 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 11:02:55,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304086215] [2020-07-20 11:02:55,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:55,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:02:55,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750820141] [2020-07-20 11:02:55,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:02:55,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:55,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:02:55,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:02:55,549 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 11:02:56,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:56,620 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 11:02:56,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:56,622 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 11:02:56,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:56,630 INFO L225 Difference]: With dead ends: 122 [2020-07-20 11:02:56,630 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 11:02:56,632 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 11:02:56,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 11:02:56,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 11:02:56,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:02:56,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:02:56,652 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 11:02:56,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:56,655 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:02:56,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:02:56,655 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:02:56,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5131 [2020-07-20 11:02:56,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:56,922 INFO L422 BasicCegarLoop]: trace histogram [755, 755, 593, 377, 377, 377, 377, 377, 377, 377, 216, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:57,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:57,135 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:57,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:57,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1930612962, now seen corresponding path program 10 times [2020-07-20 11:02:57,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:57,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792411733] [2020-07-20 11:02:57,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:58,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:58,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 11396 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:02:59,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:07,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40602 refuted. 0 times theorem prover too weak. 1551693 trivial. 0 not checked. [2020-07-20 11:03:07,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:24,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:34,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:34,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:39,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:39,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:41,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:41,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:43,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:43,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:43,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:43,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:52,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40757 refuted. 0 times theorem prover too weak. 1551538 trivial. 0 not checked. [2020-07-20 11:03:52,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792411733] [2020-07-20 11:03:52,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:52,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:03:52,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600663553] [2020-07-20 11:03:52,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:03:52,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:52,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:03:52,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:03:52,797 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 11:03:54,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:54,098 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 11:03:54,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:03:54,102 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5130 [2020-07-20 11:03:54,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:54,110 INFO L225 Difference]: With dead ends: 127 [2020-07-20 11:03:54,110 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 11:03:54,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10270 GetRequests, 10212 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 11:03:54,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 11:03:54,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 11:03:54,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:03:54,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:03:54,131 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5130 [2020-07-20 11:03:54,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:54,135 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:03:54,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:03:54,135 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:03:54,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9634 [2020-07-20 11:03:54,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:54,578 INFO L422 BasicCegarLoop]: trace histogram [1481, 1481, 741, 740, 740, 740, 740, 740, 740, 740, 740, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:54,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:54,784 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:54,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:54,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1675983471, now seen corresponding path program 11 times [2020-07-20 11:03:54,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:54,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809032853] [2020-07-20 11:03:54,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:58,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:58,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 21491 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:03:58,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:25,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82758 refuted. 0 times theorem prover too weak. 5657634 trivial. 0 not checked. [2020-07-20 11:04:25,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:53,218 WARN L193 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:05:01,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:34,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:34,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:40,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:40,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:43,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:44,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:44,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:45,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:45,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:46,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:13,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82934 refuted. 0 times theorem prover too weak. 5657458 trivial. 0 not checked. [2020-07-20 11:06:13,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809032853] [2020-07-20 11:06:13,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:13,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:06:13,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836525319] [2020-07-20 11:06:13,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:06:13,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:13,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:06:13,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:06:13,615 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 11:06:15,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:15,030 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 11:06:15,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:06:15,032 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9633 [2020-07-20 11:06:15,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:15,043 INFO L225 Difference]: With dead ends: 132 [2020-07-20 11:06:15,043 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 11:06:15,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19278 GetRequests, 19215 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:06:15,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 11:06:15,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 11:06:15,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:06:15,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:06:15,068 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9633 [2020-07-20 11:06:15,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:15,075 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:06:15,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:06:15,076 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:06:15,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10180 [2020-07-20 11:06:15,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:15,552 INFO L422 BasicCegarLoop]: trace histogram [1507, 1507, 1130, 753, 753, 753, 753, 753, 753, 753, 377, 377, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:15,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:15,753 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:15,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:15,756 INFO L82 PathProgramCache]: Analyzing trace with hash -345968448, now seen corresponding path program 11 times [2020-07-20 11:06:15,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:15,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686411201] [2020-07-20 11:06:15,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:19,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:19,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 22622 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:06:19,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:52,712 INFO L134 CoverageAnalysis]: Checked inductivity of 6309481 backedges. 10107 proven. 90074 refuted. 0 times theorem prover too weak. 6209300 trivial. 0 not checked. [2020-07-20 11:06:52,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:05,911 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:07:06,024 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:07:06,136 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:07:06,240 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:08:00,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:00,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:20,660 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:20,763 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:21,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:41,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:41,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:49,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:49,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:52,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:52,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:55,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:55,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:56,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:57,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:57,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:57,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:57,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:57,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:58,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 6309481 backedges. 10107 proven. 90261 refuted. 0 times theorem prover too weak. 6209113 trivial. 0 not checked. [2020-07-20 11:09:33,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686411201] [2020-07-20 11:09:33,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:09:33,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:09:33,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809071004] [2020-07-20 11:09:33,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:09:33,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:09:33,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:09:33,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:09:33,370 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 11:09:35,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:09:35,505 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 11:09:35,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:09:35,509 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10179 [2020-07-20 11:09:35,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:09:35,523 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:09:35,524 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:09:35,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20369 GetRequests, 20306 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:09:35,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:09:35,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 11:09:35,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:09:35,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:09:35,561 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10179 [2020-07-20 11:09:35,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:09:35,567 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:09:35,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:09:35,568 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:09:37,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13261 [2020-07-20 11:09:37,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:09:37,879 INFO L422 BasicCegarLoop]: trace histogram [2039, 2039, 1020, 1019, 1019, 1019, 1019, 1019, 1019, 1019, 1019, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:09:38,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:38,094 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:09:38,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:09:38,101 INFO L82 PathProgramCache]: Analyzing trace with hash 424403340, now seen corresponding path program 12 times [2020-07-20 11:09:38,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:09:38,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594355617] [2020-07-20 11:09:38,103 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 11:09:42,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:09:42,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 29582 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:09:43,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:10:51,827 INFO L134 CoverageAnalysis]: Checked inductivity of 10904319 backedges. 15201 proven. 124587 refuted. 0 times theorem prover too weak. 10764531 trivial. 0 not checked. [2020-07-20 11:10:51,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:10:55,011 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:10:55,116 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:10:56,906 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:57,017 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:57,131 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:58,748 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:58,865 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:58,993 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:10:59,116 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:11:03,860 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:11:04,000 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:11:04,149 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:11:04,290 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:11:08,595 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:11:08,731 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:11:08,870 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:11:09,010 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:11:18,173 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:11:18,309 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:11:18,459 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:11:18,621 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:11:18,773 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 11:11:18,934 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 11:11:19,069 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 11:11:19,204 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 11:11:19,328 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:11:19,447 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 11:12:40,645 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:12:50,991 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:51,095 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:52,837 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:52,948 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:53,153 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:12:54,781 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:54,895 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:55,023 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:12:55,157 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:00,466 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:00,601 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:00,744 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:00,886 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:06,168 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:06,321 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:06,477 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:06,642 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:06,810 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 11:13:06,961 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 11:13:07,104 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:13:07,235 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 11:13:07,363 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 11:13:07,477 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:13:07,598 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:07,706 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:07,813 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 11:13:08,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts