/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -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 [2020-07-21 22:05:55,831 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 22:05:55,854 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:05:55,856 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:05:55,858 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:05:55,868 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:05:55,873 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:05:55,875 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:05:55,877 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:05:55,878 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:05:55,878 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:05:55,880 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:05:55,882 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:05:55,883 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:05:55,885 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:05:55,886 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:05:55,887 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:05:55,891 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:05:55,896 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:05:55,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:05:55,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:05:55,901 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:05:55,904 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:05:55,915 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 [2020-07-21 22:05:55,948 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:05:55,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:05:55,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:05:55,952 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:05:55,954 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:05:55,955 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:05:55,955 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:05:55,955 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:05:55,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:05:55,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:05:55,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:05:55,956 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:05:55,956 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:05:55,956 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:05:55,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:05:55,958 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:05:55,958 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:05:55,958 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:05:55,958 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:05:55,959 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:05:55,959 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:05:55,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:05:55,961 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:05:55,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:05:55,962 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:05:55,962 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:05:55,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:55,963 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:05:55,963 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:05:55,963 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:05:56,272 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:05:56,289 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:05:56,293 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:05:56,294 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:05:56,294 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:05:56,295 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-21 22:05:56,370 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/878d0a80c/0c933cc2451b4421a0f13f563f897ed9/FLAGcc45dc824 [2020-07-21 22:05:56,836 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:05:56,837 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-21 22:05:56,844 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/878d0a80c/0c933cc2451b4421a0f13f563f897ed9/FLAGcc45dc824 [2020-07-21 22:05:57,232 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/878d0a80c/0c933cc2451b4421a0f13f563f897ed9 [2020-07-21 22:05:57,242 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:05:57,245 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:05:57,246 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:05:57,246 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:05:57,250 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:05:57,251 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,253 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@180a6f84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57, skipping insertion in model container [2020-07-21 22:05:57,254 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,260 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:05:57,275 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:05:57,454 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:05:57,463 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:05:57,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:05:57,507 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:05:57,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57 WrapperNode [2020-07-21 22:05:57,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:05:57,510 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:05:57,511 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:05:57,511 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:05:57,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,532 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,545 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,548 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (1/1) ... [2020-07-21 22:05:57,551 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:05:57,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:05:57,553 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:05:57,553 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:05:57,554 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (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 [2020-07-21 22:05:57,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:05:57,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:05:57,729 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:05:57,729 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:05:57,729 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:05:57,731 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:05:57,731 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:05:57,731 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:05:57,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:05:57,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:05:57,959 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:05:57,960 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:05:57,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:05:57 BoogieIcfgContainer [2020-07-21 22:05:57,964 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:05:57,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:05:57,965 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:05:57,968 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:05:57,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:05:57" (1/3) ... [2020-07-21 22:05:57,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2649db69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:05:57, skipping insertion in model container [2020-07-21 22:05:57,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:57" (2/3) ... [2020-07-21 22:05:57,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2649db69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:05:57, skipping insertion in model container [2020-07-21 22:05:57,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:05:57" (3/3) ... [2020-07-21 22:05:57,972 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-1.c [2020-07-21 22:05:57,983 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:05:57,991 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:05:58,005 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:05:58,027 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:05:58,028 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:05:58,028 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:05:58,028 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:05:58,028 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:05:58,028 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:05:58,028 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:05:58,029 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:05:58,043 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:05:58,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:05:58,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:58,050 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:58,051 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:58,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:58,056 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:05:58,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:58,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631379410] [2020-07-21 22:05:58,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:05:58,143 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:58,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:58,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:05:58,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:58,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:05:58,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:05:58,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631379410] [2020-07-21 22:05:58,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:05:58,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:05:58,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775765226] [2020-07-21 22:05:58,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:05:58,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:58,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:05:58,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:05:58,341 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:05:58,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:58,432 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:05:58,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:05:58,434 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:05:58,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:58,445 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:05:58,445 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:05:58,449 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 [2020-07-21 22:05:58,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:05:58,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:05:58,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:05:58,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:05:58,497 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:05:58,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:58,498 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:05:58,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:05:58,499 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:05:58,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:05:58,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:58,501 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:58,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:58,717 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:58,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:58,718 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:05:58,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:58,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012648366] [2020-07-21 22:05:58,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:05:58,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:05:58,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:58,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:05:58,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:58,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:05:58,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:05:58,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012648366] [2020-07-21 22:05:58,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:05:58,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:05:58,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508241554] [2020-07-21 22:05:58,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:05:58,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:58,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:05:58,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:05:58,808 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:05:58,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:58,878 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:05:58,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:05:58,879 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:05:58,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:58,881 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:05:58,881 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:05:58,882 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 [2020-07-21 22:05:58,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:05:58,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:05:58,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:05:58,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:05:58,892 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:05:58,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:58,892 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:05:58,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:05:58,893 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:05:58,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:05:58,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:58,895 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] [2020-07-21 22:05:59,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:59,109 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:59,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:59,110 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:05:59,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:59,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066657907] [2020-07-21 22:05:59,111 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:05:59,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:59,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:59,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:05:59,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:59,233 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:05:59,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:59,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:59,474 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:05:59,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066657907] [2020-07-21 22:05:59,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:59,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:05:59,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777004028] [2020-07-21 22:05:59,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:05:59,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:59,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:05:59,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:05:59,478 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:05:59,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:59,586 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:05:59,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:05:59,586 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:05:59,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:59,588 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:05:59,589 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:05:59,590 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 [2020-07-21 22:05:59,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:05:59,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:05:59,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:05:59,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:05:59,599 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:05:59,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:59,600 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:05:59,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:05:59,600 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:05:59,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:05:59,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:59,602 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] [2020-07-21 22:05:59,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:59,818 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:59,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:59,819 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:05:59,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:59,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580097127] [2020-07-21 22:05:59,821 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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) [2020-07-21 22:05:59,846 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:59,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:59,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:05:59,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:59,882 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:05:59,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:00,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,053 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:06:00,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580097127] [2020-07-21 22:06:00,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:00,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:06:00,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263707717] [2020-07-21 22:06:00,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:06:00,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:00,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:06:00,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:06:00,056 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:06:00,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:00,137 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:06:00,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:06:00,138 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:06:00,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:00,140 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:06:00,140 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:06:00,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:00,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:06:00,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:06:00,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:06:00,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:06:00,151 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:06:00,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:00,152 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:06:00,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:06:00,152 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:06:00,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:06:00,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:00,154 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] [2020-07-21 22:06:00,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:00,368 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:00,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:00,369 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:06:00,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:00,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762483670] [2020-07-21 22:06:00,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:00,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:00,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:00,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:06:00,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:00,464 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:06:00,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:00,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,782 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:06:00,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762483670] [2020-07-21 22:06:00,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:00,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:06:00,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665601428] [2020-07-21 22:06:00,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:06:00,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:00,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:06:00,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:00,785 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:06:00,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:00,918 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:06:00,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:06:00,919 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:06:00,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:00,921 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:06:00,921 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:06:00,922 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 [2020-07-21 22:06:00,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:06:00,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:06:00,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:06:00,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:06:00,932 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:06:00,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:00,933 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:06:00,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:06:00,933 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:06:00,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:06:00,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:00,935 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] [2020-07-21 22:06:01,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:01,142 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:01,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:01,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:06:01,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:01,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901634191] [2020-07-21 22:06:01,145 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:01,177 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:01,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:01,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:06:01,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:01,214 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:06:01,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:01,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:06:01,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901634191] [2020-07-21 22:06:01,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:01,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:06:01,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110789835] [2020-07-21 22:06:01,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:06:01,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:01,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:06:01,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:01,509 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:06:01,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:01,648 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:06:01,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:06:01,648 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:06:01,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:01,651 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:06:01,651 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:06:01,652 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 [2020-07-21 22:06:01,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:06:01,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:06:01,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:06:01,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:06:01,662 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:06:01,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:01,663 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:06:01,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:06:01,663 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:06:01,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:06:01,665 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:01,666 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] [2020-07-21 22:06:01,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:01,870 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:01,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:01,871 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:06:01,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:01,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58255125] [2020-07-21 22:06:01,872 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:01,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:01,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:01,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:06:01,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:01,964 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:06:01,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:02,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:02,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:02,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:02,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:02,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:02,540 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:06:02,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58255125] [2020-07-21 22:06:02,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:02,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:06:02,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597298745] [2020-07-21 22:06:02,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:06:02,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:02,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:06:02,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:06:02,545 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:06:02,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:02,727 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:06:02,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:06:02,728 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:06:02,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:02,730 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:06:02,730 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:06:02,733 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 [2020-07-21 22:06:02,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:06:02,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:06:02,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:06:02,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:06:02,758 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:06:02,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:02,758 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:06:02,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:06:02,759 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:06:02,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:06:02,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:02,769 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] [2020-07-21 22:06:02,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:02,982 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:02,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:02,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:06:02,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:02,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397007658] [2020-07-21 22:06:02,985 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:03,043 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:03,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:03,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:06:03,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:03,113 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:06:03,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:03,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,716 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:06:03,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397007658] [2020-07-21 22:06:03,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:03,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:06:03,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077751917] [2020-07-21 22:06:03,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:06:03,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:03,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:06:03,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:06:03,723 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 22:06:03,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:03,881 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:06:03,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:06:03,884 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 22:06:03,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:03,886 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:06:03,886 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:06:03,887 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 [2020-07-21 22:06:03,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:06:03,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:06:03,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:06:03,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:06:03,900 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:06:03,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:03,901 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:06:03,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:06:03,901 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:06:03,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:06:03,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:03,904 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] [2020-07-21 22:06:04,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:04,120 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:04,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:04,121 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:06:04,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:04,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498749225] [2020-07-21 22:06:04,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:04,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:04,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:04,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:04,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:04,240 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:06:04,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:04,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:04,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:04,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:05,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:05,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:05,151 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:06:05,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498749225] [2020-07-21 22:06:05,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:05,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:05,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063055421] [2020-07-21 22:06:05,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:05,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:05,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:05,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:05,154 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 22:06:05,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:05,418 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:06:05,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:05,418 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 22:06:05,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:05,423 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:06:05,423 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:06:05,424 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 [2020-07-21 22:06:05,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:06:05,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:06:05,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:05,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:05,436 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:06:05,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:05,437 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:05,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:05,437 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:05,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:06:05,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:05,440 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] [2020-07-21 22:06:05,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:05,649 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:05,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:05,649 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:06:05,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:05,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031771348] [2020-07-21 22:06:05,651 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:05,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:05,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:05,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:05,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:05,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 22:06:05,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:06,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 22:06:06,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031771348] [2020-07-21 22:06:06,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:06,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:06,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366346074] [2020-07-21 22:06:06,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:06,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:06,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:06,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:06,913 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 22:06:07,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:07,079 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 22:06:07,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:07,080 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:06:07,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:07,083 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:06:07,083 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:06:07,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:06:07,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:06:07,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 22:06:07,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:07,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:07,096 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 22:06:07,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:07,097 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:07,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:07,097 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:07,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 22:06:07,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:07,101 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] [2020-07-21 22:06:07,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:07,314 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:07,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:07,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 22:06:07,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:07,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192472674] [2020-07-21 22:06:07,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:07,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:07,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:07,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:06:07,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:07,518 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 22:06:07,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:08,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:08,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,409 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 22:06:09,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192472674] [2020-07-21 22:06:09,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:09,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:06:09,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930644055] [2020-07-21 22:06:09,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:06:09,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:09,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:06:09,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:09,415 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 22:06:09,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:09,627 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 22:06:09,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:06:09,627 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 22:06:09,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:09,631 INFO L225 Difference]: With dead ends: 72 [2020-07-21 22:06:09,631 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:06:09,632 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 [2020-07-21 22:06:09,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:06:09,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 22:06:09,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:06:09,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:06:09,660 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 22:06:09,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:09,661 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:06:09,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:06:09,662 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:06:09,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 22:06:09,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:09,668 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] [2020-07-21 22:06:09,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:09,882 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:09,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:09,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 22:06:09,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:09,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911735209] [2020-07-21 22:06:09,884 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:09,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:09,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:09,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:06:09,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:10,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 22:06:10,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:11,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:11,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:11,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:11,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:11,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:11,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:12,032 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 22:06:12,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911735209] [2020-07-21 22:06:12,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:12,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:06:12,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752415637] [2020-07-21 22:06:12,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:06:12,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:12,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:06:12,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:12,035 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 22:06:12,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:12,269 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 22:06:12,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:06:12,270 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 22:06:12,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:12,273 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:06:12,274 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 22:06:12,274 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 [2020-07-21 22:06:12,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 22:06:12,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 22:06:12,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:06:12,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:06:12,286 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 22:06:12,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:12,287 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:06:12,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:06:12,287 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:06:12,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 22:06:12,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:12,297 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] [2020-07-21 22:06:12,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:12,512 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:12,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:12,512 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 22:06:12,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:12,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036202404] [2020-07-21 22:06:12,513 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:12,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:12,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:12,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:06:12,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 22:06:12,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:14,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:15,940 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 22:06:15,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036202404] [2020-07-21 22:06:15,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:15,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:06:15,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696584572] [2020-07-21 22:06:15,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:06:15,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:15,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:06:15,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:06:15,943 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 22:06:16,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:16,310 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 22:06:16,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:06:16,310 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 22:06:16,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:16,319 INFO L225 Difference]: With dead ends: 82 [2020-07-21 22:06:16,319 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:06:16,321 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 [2020-07-21 22:06:16,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:06:16,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 22:06:16,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:06:16,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:06:16,344 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 22:06:16,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:16,347 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:06:16,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:06:16,347 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:06:16,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 22:06:16,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:16,352 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] [2020-07-21 22:06:16,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:16,568 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:16,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:16,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 22:06:16,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:16,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412550915] [2020-07-21 22:06:16,570 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:16,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:16,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:16,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:06:16,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 22:06:16,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:18,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:19,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:20,055 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 22:06:20,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412550915] [2020-07-21 22:06:20,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:20,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:06:20,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765226771] [2020-07-21 22:06:20,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:06:20,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:20,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:06:20,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:06:20,059 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 22:06:20,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:20,571 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 22:06:20,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:06:20,572 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 22:06:20,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:20,578 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:06:20,578 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 22:06:20,581 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 [2020-07-21 22:06:20,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 22:06:20,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 22:06:20,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:06:20,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:06:20,613 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 22:06:20,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:20,614 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:06:20,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:06:20,614 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:06:20,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 22:06:20,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:20,629 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] [2020-07-21 22:06:20,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:20,844 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:20,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:20,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 22:06:20,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:20,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817917294] [2020-07-21 22:06:20,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:21,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:21,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:21,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:06:21,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:21,468 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 22:06:21,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:24,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:24,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:25,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:27,175 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 22:06:27,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817917294] [2020-07-21 22:06:27,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:27,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:06:27,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130848598] [2020-07-21 22:06:27,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:06:27,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:27,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:06:27,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:06:27,180 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 22:06:27,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:27,579 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 22:06:27,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:06:27,580 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 22:06:27,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:27,585 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:06:27,585 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:06:27,588 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 [2020-07-21 22:06:27,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:06:27,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 22:06:27,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:06:27,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:06:27,605 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 22:06:27,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:27,607 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:06:27,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:06:27,607 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:06:27,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2020-07-21 22:06:27,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:27,626 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 147, 89, 89, 89, 89, 89, 89, 89, 58, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:27,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:27,840 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:27,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:27,841 INFO L82 PathProgramCache]: Analyzing trace with hash 104339052, now seen corresponding path program 7 times [2020-07-21 22:06:27,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:27,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789572268] [2020-07-21 22:06:27,842 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:28,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:28,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:28,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:06:28,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:28,820 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6738 refuted. 0 times theorem prover too weak. 82488 trivial. 0 not checked. [2020-07-21 22:06:28,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:32,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:32,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:35,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:35,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:35,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:35,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:35,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:36,183 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6815 refuted. 0 times theorem prover too weak. 82411 trivial. 0 not checked. [2020-07-21 22:06:36,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789572268] [2020-07-21 22:06:36,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:36,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:06:36,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910198604] [2020-07-21 22:06:36,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:06:36,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:36,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:06:36,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:06:36,188 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 22:06:36,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:36,749 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 22:06:36,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:06:36,750 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1228 [2020-07-21 22:06:36,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:36,756 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:06:36,756 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 22:06:36,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2463 GetRequests, 2420 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:06:36,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 22:06:36,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 22:06:36,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:06:36,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:06:36,771 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1228 [2020-07-21 22:06:36,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:36,773 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:06:36,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:06:36,773 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:06:36,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 22:06:36,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:36,807 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:37,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:37,021 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:37,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:37,022 INFO L82 PathProgramCache]: Analyzing trace with hash 621098440, now seen corresponding path program 8 times [2020-07-21 22:06:37,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:37,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443373993] [2020-07-21 22:06:37,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:37,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:37,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:37,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:06:37,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 11918 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 22:06:39,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:45,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:47,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:49,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:49,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:49,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:51,908 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 12010 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 22:06:51,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443373993] [2020-07-21 22:06:51,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:51,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:06:51,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793397327] [2020-07-21 22:06:51,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:06:51,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:51,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:06:51,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:06:51,913 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 22:06:52,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:52,334 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 22:06:52,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:06:52,335 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 22:06:52,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:52,341 INFO L225 Difference]: With dead ends: 102 [2020-07-21 22:06:52,341 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:06:52,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:06:52,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:06:52,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 22:06:52,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:06:52,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:06:52,361 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 22:06:52,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:52,363 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:06:52,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:06:52,363 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:06:52,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1690 [2020-07-21 22:06:52,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:52,394 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 212, 122, 122, 122, 122, 122, 122, 122, 90, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:52,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:52,609 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:52,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:52,610 INFO L82 PathProgramCache]: Analyzing trace with hash 249367267, now seen corresponding path program 8 times [2020-07-21 22:06:52,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:52,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089076870] [2020-07-21 22:06:52,611 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:06:52,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:52,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:52,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 935 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:06:53,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:54,556 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10458 refuted. 0 times theorem prover too weak. 159447 trivial. 0 not checked. [2020-07-21 22:06:54,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:59,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:01,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:01,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:03,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:03,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:03,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:05,748 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10558 refuted. 0 times theorem prover too weak. 159347 trivial. 0 not checked. [2020-07-21 22:07:05,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089076870] [2020-07-21 22:07:05,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:05,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:07:05,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070320169] [2020-07-21 22:07:05,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:07:05,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:05,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:07:05,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:05,752 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 22:07:06,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:06,199 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 22:07:06,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:07:06,200 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1689 [2020-07-21 22:07:06,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:06,207 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:07:06,207 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:07:06,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3338 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:07:06,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:07:06,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 22:07:06,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:07:06,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:07:06,227 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1689 [2020-07-21 22:07:06,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:06,229 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:07:06,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:07:06,229 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:07:06,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2341 [2020-07-21 22:07:06,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:06,289 INFO L422 BasicCegarLoop]: trace histogram [359, 359, 180, 179, 179, 179, 179, 179, 179, 179, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:06,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:06,503 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:06,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:06,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1393099828, now seen corresponding path program 9 times [2020-07-21 22:07:06,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:06,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137030235] [2020-07-21 22:07:06,505 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:07:07,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:07,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:07,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 1303 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:07:07,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:09,247 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16027 refuted. 0 times theorem prover too weak. 318381 trivial. 0 not checked. [2020-07-21 22:07:09,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:17,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:20,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:22,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,301 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16144 refuted. 0 times theorem prover too weak. 318264 trivial. 0 not checked. [2020-07-21 22:07:27,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137030235] [2020-07-21 22:07:27,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:27,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:07:27,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389550963] [2020-07-21 22:07:27,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:07:27,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:27,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:07:27,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:07:27,306 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 22:07:28,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:28,064 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 22:07:28,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:07:28,065 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2340 [2020-07-21 22:07:28,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:28,072 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:07:28,072 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:07:28,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4690 GetRequests, 4637 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:07:28,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:07:28,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 22:07:28,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:07:28,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:07:28,090 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2340 [2020-07-21 22:07:28,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:28,092 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:07:28,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:07:28,092 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:07:28,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3057 [2020-07-21 22:07:28,158 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:28,159 INFO L422 BasicCegarLoop]: trace histogram [447, 447, 367, 223, 223, 223, 223, 223, 223, 223, 144, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:28,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:28,360 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:28,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:28,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1980951758, now seen corresponding path program 9 times [2020-07-21 22:07:28,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:28,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1734721731] [2020-07-21 22:07:28,363 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:07:28,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:28,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:28,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 1694 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:07:29,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:33,496 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21700 refuted. 0 times theorem prover too weak. 540315 trivial. 0 not checked. [2020-07-21 22:07:33,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:43,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:48,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:50,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:50,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:52,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:52,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:56,655 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21826 refuted. 0 times theorem prover too weak. 540189 trivial. 0 not checked. [2020-07-21 22:07:56,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1734721731] [2020-07-21 22:07:56,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:56,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:07:56,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664637012] [2020-07-21 22:07:56,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:07:56,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:56,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:07:56,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:07:56,660 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 22:07:57,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:57,544 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 22:07:57,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:07:57,545 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3056 [2020-07-21 22:07:57,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:57,551 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:07:57,551 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 22:07:57,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6121 GetRequests, 6068 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:07:57,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 22:07:57,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 22:07:57,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:07:57,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:07:57,574 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3056 [2020-07-21 22:07:57,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:57,576 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:07:57,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:07:57,576 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:07:57,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4733 [2020-07-21 22:07:57,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:57,793 INFO L422 BasicCegarLoop]: trace histogram [727, 727, 364, 363, 363, 363, 363, 363, 363, 363, 363, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:58,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:58,008 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:58,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:58,010 INFO L82 PathProgramCache]: Analyzing trace with hash 695057410, now seen corresponding path program 10 times [2020-07-21 22:07:58,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:58,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568949769] [2020-07-21 22:07:58,011 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:07:58,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:58,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:58,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 2634 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:07:59,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:06,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36414 refuted. 0 times theorem prover too weak. 1342596 trivial. 0 not checked. [2020-07-21 22:08:06,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:22,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:22,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:31,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:36,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:39,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:40,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:40,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:40,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:40,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:49,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36559 refuted. 0 times theorem prover too weak. 1342451 trivial. 0 not checked. [2020-07-21 22:08:49,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568949769] [2020-07-21 22:08:49,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:49,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:08:49,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339937045] [2020-07-21 22:08:49,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:08:49,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:49,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:08:49,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:08:49,237 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 22:08:50,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:50,326 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 22:08:50,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:08:50,332 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4732 [2020-07-21 22:08:50,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:50,339 INFO L225 Difference]: With dead ends: 122 [2020-07-21 22:08:50,339 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 22:08:50,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9475 GetRequests, 9417 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:08:50,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 22:08:50,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 22:08:50,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:08:50,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:08:50,362 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4732 [2020-07-21 22:08:50,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:50,365 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:08:50,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:08:50,366 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:08:50,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7331 [2020-07-21 22:08:50,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:50,688 INFO L422 BasicCegarLoop]: trace histogram [1079, 1079, 849, 539, 539, 539, 539, 539, 539, 539, 310, 230, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:50,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:50,889 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:50,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:50,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1714887868, now seen corresponding path program 10 times [2020-07-21 22:08:50,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:50,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687833057] [2020-07-21 22:08:50,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:08:52,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:52,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:52,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 4069 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:08:52,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:10,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3266264 backedges. 6766 proven. 59101 refuted. 0 times theorem prover too weak. 3200397 trivial. 0 not checked. [2020-07-21 22:09:10,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:39,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:51,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:51,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:58,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:58,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:00,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:00,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:02,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:02,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:03,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:03,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:03,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:04,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:04,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:04,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:04,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:04,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:22,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3266264 backedges. 6766 proven. 59256 refuted. 0 times theorem prover too weak. 3200242 trivial. 0 not checked. [2020-07-21 22:10:22,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687833057] [2020-07-21 22:10:22,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:10:22,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:10:22,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210144580] [2020-07-21 22:10:22,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:10:22,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:10:22,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:10:22,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:10:22,440 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 22:10:23,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:10:23,523 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 22:10:23,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:10:23,527 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7330 [2020-07-21 22:10:23,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:10:23,535 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:10:23,535 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 22:10:23,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14670 GetRequests, 14612 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:10:23,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 22:10:23,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 22:10:23,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:10:23,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:10:23,559 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7330 [2020-07-21 22:10:23,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:10:23,563 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:10:23,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:10:23,564 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:10:24,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6176 [2020-07-21 22:10:24,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:10:24,053 INFO L422 BasicCegarLoop]: trace histogram [949, 949, 475, 474, 474, 474, 474, 474, 474, 474, 474, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:10:24,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:24,267 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:10:24,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:10:24,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1487532817, now seen corresponding path program 11 times [2020-07-21 22:10:24,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:10:24,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527397078] [2020-07-21 22:10:24,271 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:10:25,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:10:25,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:10:25,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 3441 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:10:25,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:10:38,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2359809 backedges. 6990 proven. 52504 refuted. 0 times theorem prover too weak. 2300315 trivial. 0 not checked. [2020-07-21 22:10:38,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:11:03,079 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:11:03,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:13,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:22,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:22,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:25,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:25,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:28,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:29,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:29,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:30,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:30,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:31,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:31,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:31,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:31,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:31,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:45,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2359809 backedges. 6990 proven. 52680 refuted. 0 times theorem prover too weak. 2300139 trivial. 0 not checked. [2020-07-21 22:11:45,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527397078] [2020-07-21 22:11:45,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:11:45,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:11:45,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139516448] [2020-07-21 22:11:45,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:11:45,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:11:45,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:11:45,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:11:45,216 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 22:11:46,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:11:46,401 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 22:11:46,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:11:46,403 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6175 [2020-07-21 22:11:46,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:11:46,412 INFO L225 Difference]: With dead ends: 132 [2020-07-21 22:11:46,413 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 22:11:46,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12362 GetRequests, 12299 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:11:46,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 22:11:46,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 22:11:46,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:11:46,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:11:46,441 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6175 [2020-07-21 22:11:46,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:11:46,446 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:11:46,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:11:46,447 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:11:47,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8773 [2020-07-21 22:11:47,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:11:47,322 INFO L422 BasicCegarLoop]: trace histogram [1295, 1295, 995, 647, 647, 647, 647, 647, 647, 647, 348, 300, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:11:47,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:11:47,537 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:11:47,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:11:47,541 INFO L82 PathProgramCache]: Analyzing trace with hash 101092812, now seen corresponding path program 11 times [2020-07-21 22:11:47,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:11:47,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367019934] [2020-07-21 22:11:47,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:11:49,126 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:11:49,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:11:49,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 4870 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:11:49,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:12:14,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4681899 backedges. 8205 proven. 78060 refuted. 0 times theorem prover too weak. 4595634 trivial. 0 not checked. [2020-07-21 22:12:14,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:12:54,502 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 22:12:59,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:59,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:12,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:23,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:23,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:29,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:29,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:31,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:31,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:33,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:33,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:33,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:34,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:01,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4681899 backedges. 8205 proven. 78247 refuted. 0 times theorem prover too weak. 4595447 trivial. 0 not checked. [2020-07-21 22:14:01,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367019934] [2020-07-21 22:14:01,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:14:01,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:14:01,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230104117] [2020-07-21 22:14:01,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:14:01,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:14:01,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:14:01,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:14:01,037 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 22:14:03,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:14:03,017 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 22:14:03,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:14:03,019 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8772 [2020-07-21 22:14:03,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:14:03,031 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:14:03,032 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 22:14:03,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17555 GetRequests, 17492 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:14:03,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 22:14:03,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 22:14:03,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:14:03,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:14:03,063 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8772 [2020-07-21 22:14:03,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:14:03,067 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:14:03,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:14:03,067 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:14:04,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16147 [2020-07-21 22:14:04,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:14:04,961 INFO L422 BasicCegarLoop]: trace histogram [2483, 2483, 1242, 1241, 1241, 1241, 1241, 1241, 1241, 1241, 1241, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:14:05,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:14:05,162 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:14:05,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:14:05,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1153856696, now seen corresponding path program 12 times [2020-07-21 22:14:05,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:14:05,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777017297] [2020-07-21 22:14:05,168 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-21 22:14:07,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:14:07,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:14:07,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 9002 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:14:07,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:15:38,907 INFO L134 CoverageAnalysis]: Checked inductivity of 16172712 backedges. 16185 proven. 154239 refuted. 0 times theorem prover too weak. 16002288 trivial. 0 not checked. [2020-07-21 22:15:38,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:15:56,672 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:15:56,776 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:15:56,885 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 22:16:46,798 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:17:11,565 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 22:17:19,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:44,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:44,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:08,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:08,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:19,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:25,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:28,019 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 22:18:28,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:29,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:30,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:30,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:30,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:31,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:31,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:31,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts