/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 NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:45:46,828 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:45:46,830 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:45:46,843 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 15:45:46,853 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:45:46,855 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:45:46,856 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:45:46,857 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:45:46,858 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:45:46,858 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:45:46,860 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:45:46,862 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:45:46,863 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:45:46,864 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:45:46,865 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:45:46,866 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:45:46,868 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:45:46,876 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:45:46,877 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:45:46,878 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:45:46,879 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 15:45:46,894 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:45:46,894 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:45:46,895 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:45:46,895 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:45:46,896 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:45:46,896 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:45:46,896 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:45:46,896 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:45:46,897 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:45:46,897 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:45:46,897 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:45:46,897 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:45:46,897 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:45:46,898 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:45:46,898 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:45:46,898 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:45:46,898 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:45:46,899 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:45:46,899 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:45:46,899 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:45:46,899 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:45:46,899 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:45:46,900 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:45:46,900 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:45:46,900 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:45:46,900 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:45:46,900 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:46,901 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:45:46,901 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:45:46,901 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 -> NUM_VARIABLES 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 -> 2 [2020-07-21 15:45:47,268 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:45:47,282 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:45:47,286 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:45:47,287 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:45:47,288 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:45:47,289 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 15:45:47,355 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3274330ba/5096e95b342a4c19ab92645ea1de3b35/FLAG7c490399d [2020-07-21 15:45:47,805 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:45:47,805 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 15:45:47,812 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3274330ba/5096e95b342a4c19ab92645ea1de3b35/FLAG7c490399d [2020-07-21 15:45:48,239 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3274330ba/5096e95b342a4c19ab92645ea1de3b35 [2020-07-21 15:45:48,248 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:45:48,251 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:45:48,252 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:48,252 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:45:48,256 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:45:48,257 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,260 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29bc61ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48, skipping insertion in model container [2020-07-21 15:45:48,260 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,268 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:45:48,288 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:45:48,457 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:48,462 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:45:48,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:48,494 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:45:48,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48 WrapperNode [2020-07-21 15:45:48,495 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:48,496 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:45:48,496 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:45:48,496 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:45:48,507 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,507 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,512 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,512 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,515 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,519 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (1/1) ... [2020-07-21 15:45:48,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:45:48,520 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:45:48,520 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:45:48,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:45:48,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (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 15:45:48,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:45:48,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:45:48,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 15:45:48,667 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:45:48,667 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:45:48,667 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:45:48,667 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 15:45:48,667 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:45:48,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:45:48,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:45:48,846 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:45:48,846 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:45:48,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:48 BoogieIcfgContainer [2020-07-21 15:45:48,851 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:45:48,853 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:45:48,853 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:45:48,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:45:48,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:45:48" (1/3) ... [2020-07-21 15:45:48,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df237c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:48, skipping insertion in model container [2020-07-21 15:45:48,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:48" (2/3) ... [2020-07-21 15:45:48,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df237c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:48, skipping insertion in model container [2020-07-21 15:45:48,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:48" (3/3) ... [2020-07-21 15:45:48,865 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-21 15:45:48,882 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:45:48,892 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:45:48,911 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:45:48,947 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:45:48,947 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:45:48,948 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:45:48,948 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:45:48,948 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:45:48,948 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:45:48,948 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:45:48,948 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:45:48,969 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 15:45:48,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:45:48,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:48,978 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:48,978 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:48,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:48,987 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 15:45:48,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:48,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958362418] [2020-07-21 15:45:48,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:49,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:49,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:49,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:45:49,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:49,163 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 15:45:49,164 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:49,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958362418] [2020-07-21 15:45:49,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:49,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:45:49,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630520459] [2020-07-21 15:45:49,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:49,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:49,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:49,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:49,185 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 15:45:49,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:49,296 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 15:45:49,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:45:49,298 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:45:49,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:49,309 INFO L225 Difference]: With dead ends: 35 [2020-07-21 15:45:49,310 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 15:45:49,313 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 15:45:49,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 15:45:49,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 15:45:49,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 15:45:49,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 15:45:49,359 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 15:45:49,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:49,360 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 15:45:49,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:49,360 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 15:45:49,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:45:49,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:49,362 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:49,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:49,569 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:49,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:49,571 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 15:45:49,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:49,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301660329] [2020-07-21 15:45:49,572 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:49,605 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:49,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:49,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:45:49,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:49,640 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 15:45:49,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:49,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301660329] [2020-07-21 15:45:49,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:49,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:45:49,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729416105] [2020-07-21 15:45:49,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:49,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:49,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:49,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:49,646 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 15:45:49,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:49,706 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 15:45:49,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:45:49,708 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:45:49,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:49,709 INFO L225 Difference]: With dead ends: 27 [2020-07-21 15:45:49,709 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 15:45:49,711 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 15:45:49,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 15:45:49,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 15:45:49,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 15:45:49,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 15:45:49,720 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 15:45:49,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:49,721 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 15:45:49,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:49,721 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 15:45:49,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:45:49,722 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:49,723 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 15:45:49,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:49,939 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:49,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:49,941 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 15:45:49,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:49,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554064252] [2020-07-21 15:45:49,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:49,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:49,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:49,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:45:49,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:50,057 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 15:45:50,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:50,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:50,289 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 15:45:50,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554064252] [2020-07-21 15:45:50,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:50,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 15:45:50,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203972844] [2020-07-21 15:45:50,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 15:45:50,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:50,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 15:45:50,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 15:45:50,292 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 15:45:50,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:50,404 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 15:45:50,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 15:45:50,405 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 15:45:50,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:50,407 INFO L225 Difference]: With dead ends: 32 [2020-07-21 15:45:50,407 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 15:45:50,408 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 15:45:50,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 15:45:50,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 15:45:50,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 15:45:50,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 15:45:50,417 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 15:45:50,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:50,418 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 15:45:50,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 15:45:50,418 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 15:45:50,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:45:50,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:50,420 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 15:45:50,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:50,635 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:50,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:50,636 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 15:45:50,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:50,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263075060] [2020-07-21 15:45:50,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:50,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:50,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:50,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:45:50,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:50,718 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 15:45:50,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:50,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:50,883 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 15:45:50,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263075060] [2020-07-21 15:45:50,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:50,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 15:45:50,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541383942] [2020-07-21 15:45:50,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 15:45:50,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:50,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 15:45:50,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 15:45:50,886 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 15:45:50,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:50,962 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 15:45:50,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 15:45:50,963 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 15:45:50,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:50,965 INFO L225 Difference]: With dead ends: 37 [2020-07-21 15:45:50,965 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 15:45:50,966 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 15:45:50,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 15:45:50,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 15:45:50,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 15:45:50,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 15:45:50,975 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 15:45:50,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:50,975 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 15:45:50,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 15:45:50,976 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 15:45:50,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:45:50,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:50,978 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 15:45:51,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:51,192 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:51,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:51,193 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 15:45:51,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:51,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703741217] [2020-07-21 15:45:51,194 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:51,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:51,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:51,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:45:51,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:51,278 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 15:45:51,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:51,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:51,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:51,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:51,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:51,590 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 15:45:51,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703741217] [2020-07-21 15:45:51,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:51,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 15:45:51,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573122474] [2020-07-21 15:45:51,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 15:45:51,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:51,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 15:45:51,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 15:45:51,593 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 15:45:51,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:51,731 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 15:45:51,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:45:51,732 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 15:45:51,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:51,734 INFO L225 Difference]: With dead ends: 42 [2020-07-21 15:45:51,735 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 15:45:51,736 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 15:45:51,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 15:45:51,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 15:45:51,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 15:45:51,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 15:45:51,745 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 15:45:51,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:51,746 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 15:45:51,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 15:45:51,746 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 15:45:51,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:45:51,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:51,748 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 15:45:51,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:51,956 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:51,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:51,957 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 15:45:51,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:51,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38732166] [2020-07-21 15:45:51,958 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:52,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:52,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:52,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:45:52,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:52,050 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 15:45:52,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:52,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:52,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:52,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:52,349 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 15:45:52,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38732166] [2020-07-21 15:45:52,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:52,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 15:45:52,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472848481] [2020-07-21 15:45:52,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 15:45:52,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:52,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 15:45:52,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 15:45:52,351 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 15:45:52,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:52,490 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 15:45:52,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:45:52,490 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 15:45:52,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:52,492 INFO L225 Difference]: With dead ends: 47 [2020-07-21 15:45:52,493 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 15:45:52,494 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 15:45:52,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 15:45:52,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 15:45:52,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 15:45:52,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 15:45:52,504 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 15:45:52,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:52,505 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 15:45:52,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 15:45:52,505 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 15:45:52,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 15:45:52,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:52,508 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 15:45:52,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:52,722 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:52,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:52,723 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 15:45:52,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:52,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900599570] [2020-07-21 15:45:52,723 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:52,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:52,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:52,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:45:52,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:52,833 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 15:45:52,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:53,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:53,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:53,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:53,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:53,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:53,451 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 15:45:53,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900599570] [2020-07-21 15:45:53,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:53,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 15:45:53,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211346087] [2020-07-21 15:45:53,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 15:45:53,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:53,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 15:45:53,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 15:45:53,454 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 15:45:53,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:53,628 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 15:45:53,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:45:53,629 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 15:45:53,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:53,631 INFO L225 Difference]: With dead ends: 52 [2020-07-21 15:45:53,631 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 15:45:53,632 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 15:45:53,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 15:45:53,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 15:45:53,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 15:45:53,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 15:45:53,643 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 15:45:53,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:53,643 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 15:45:53,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 15:45:53,644 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 15:45:53,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 15:45:53,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:53,646 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 15:45:53,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:53,852 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:53,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:53,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 15:45:53,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:53,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953944592] [2020-07-21 15:45:53,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:53,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:53,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:53,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:45:53,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:54,023 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-21 15:45:54,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:54,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:54,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:54,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:55,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:55,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:55,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:55,233 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-21 15:45:55,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953944592] [2020-07-21 15:45:55,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:55,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-21 15:45:55,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214257513] [2020-07-21 15:45:55,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:45:55,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:55,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:45:55,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:45:55,239 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-21 15:45:55,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:55,767 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-21 15:45:55,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 15:45:55,767 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-21 15:45:55,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:55,770 INFO L225 Difference]: With dead ends: 94 [2020-07-21 15:45:55,770 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:45:55,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 15:45:55,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:45:55,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 15:45:55,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:45:55,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-21 15:45:55,784 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-21 15:45:55,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:55,784 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-21 15:45:55,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:45:55,785 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-21 15:45:55,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:45:55,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:55,787 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:56,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:56,002 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:56,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:56,003 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-21 15:45:56,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:56,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351841075] [2020-07-21 15:45:56,004 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:56,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:56,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:56,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:45:56,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:56,108 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 15:45:56,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:56,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:56,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:56,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:56,624 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 15:45:56,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351841075] [2020-07-21 15:45:56,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:56,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 15:45:56,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940926603] [2020-07-21 15:45:56,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 15:45:56,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:56,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 15:45:56,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 15:45:56,626 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 13 states. [2020-07-21 15:45:56,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:56,752 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-21 15:45:56,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:45:56,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-21 15:45:56,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:56,754 INFO L225 Difference]: With dead ends: 65 [2020-07-21 15:45:56,755 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 15:45:56,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 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 15:45:56,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 15:45:56,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-21 15:45:56,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:45:56,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-21 15:45:56,763 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-21 15:45:56,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:56,764 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-21 15:45:56,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 15:45:56,764 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-21 15:45:56,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 15:45:56,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:56,766 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:56,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:56,975 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:56,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:56,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-21 15:45:56,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:56,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228757332] [2020-07-21 15:45:56,978 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:57,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:57,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:57,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:45:57,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:57,123 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 229 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2020-07-21 15:45:57,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:57,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:57,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:57,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:57,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:58,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-07-21 15:45:58,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228757332] [2020-07-21 15:45:58,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:58,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 15:45:58,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411166993] [2020-07-21 15:45:58,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 15:45:58,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:58,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 15:45:58,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:45:58,036 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 15 states. [2020-07-21 15:45:58,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:58,185 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-07-21 15:45:58,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:45:58,186 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-21 15:45:58,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:58,187 INFO L225 Difference]: With dead ends: 68 [2020-07-21 15:45:58,188 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:45:58,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 194 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 15:45:58,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:45:58,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 15:45:58,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 15:45:58,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-21 15:45:58,209 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 109 [2020-07-21 15:45:58,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:58,210 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-21 15:45:58,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 15:45:58,210 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-21 15:45:58,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-21 15:45:58,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:58,217 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:58,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:58,432 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:58,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:58,433 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2020-07-21 15:45:58,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:58,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500845962] [2020-07-21 15:45:58,434 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:58,516 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:58,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:58,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:45:58,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:58,691 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 839 refuted. 0 times theorem prover too weak. 1278 trivial. 0 not checked. [2020-07-21 15:45:58,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:59,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:00,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:01,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:01,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:01,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-07-21 15:46:01,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500845962] [2020-07-21 15:46:01,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:01,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 15:46:01,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300725182] [2020-07-21 15:46:01,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:46:01,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:01,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:46:01,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:46:01,146 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 25 states. [2020-07-21 15:46:01,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:01,886 INFO L93 Difference]: Finished difference Result 144 states and 221 transitions. [2020-07-21 15:46:01,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 15:46:01,887 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-21 15:46:01,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:01,890 INFO L225 Difference]: With dead ends: 144 [2020-07-21 15:46:01,890 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 15:46:01,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 15:46:01,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 15:46:01,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-21 15:46:01,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 15:46:01,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2020-07-21 15:46:01,904 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 218 [2020-07-21 15:46:01,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:01,905 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2020-07-21 15:46:01,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:46:01,905 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2020-07-21 15:46:01,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 15:46:01,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:01,907 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:02,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:02,121 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:02,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:02,122 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 7 times [2020-07-21 15:46:02,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:02,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114423723] [2020-07-21 15:46:02,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:02,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:02,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:02,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:46:02,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2020-07-21 15:46:02,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:03,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:03,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 573 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2020-07-21 15:46:03,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114423723] [2020-07-21 15:46:03,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:03,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 15:46:03,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899963828] [2020-07-21 15:46:03,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:46:03,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:03,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:46:03,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:46:03,799 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand 17 states. [2020-07-21 15:46:04,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:04,010 INFO L93 Difference]: Finished difference Result 85 states and 111 transitions. [2020-07-21 15:46:04,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:46:04,011 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 177 [2020-07-21 15:46:04,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:04,013 INFO L225 Difference]: With dead ends: 85 [2020-07-21 15:46:04,013 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 15:46:04,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 326 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 15:46:04,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 15:46:04,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-21 15:46:04,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 15:46:04,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2020-07-21 15:46:04,024 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 177 [2020-07-21 15:46:04,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:04,024 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2020-07-21 15:46:04,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:46:04,025 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2020-07-21 15:46:04,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 15:46:04,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:04,029 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:04,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:04,243 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:04,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:04,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-21 15:46:04,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:04,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690032838] [2020-07-21 15:46:04,245 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:04,399 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:04,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:04,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:46:04,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:04,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1130 refuted. 0 times theorem prover too weak. 3249 trivial. 0 not checked. [2020-07-21 15:46:04,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:06,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:06,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1187 refuted. 0 times theorem prover too weak. 3192 trivial. 0 not checked. [2020-07-21 15:46:07,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690032838] [2020-07-21 15:46:07,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:07,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 15:46:07,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179158231] [2020-07-21 15:46:07,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:46:07,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:07,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:46:07,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:46:07,079 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand 19 states. [2020-07-21 15:46:07,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:07,353 INFO L93 Difference]: Finished difference Result 90 states and 124 transitions. [2020-07-21 15:46:07,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:46:07,354 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2020-07-21 15:46:07,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:07,356 INFO L225 Difference]: With dead ends: 90 [2020-07-21 15:46:07,356 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 15:46:07,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 540 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 15:46:07,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 15:46:07,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-21 15:46:07,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 15:46:07,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 120 transitions. [2020-07-21 15:46:07,368 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 120 transitions. Word has length 286 [2020-07-21 15:46:07,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:07,368 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 120 transitions. [2020-07-21 15:46:07,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:46:07,369 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 120 transitions. [2020-07-21 15:46:07,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 15:46:07,380 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:07,380 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 59, 36, 36, 36, 36, 36, 36, 36, 23, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:07,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:07,593 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:07,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:07,594 INFO L82 PathProgramCache]: Analyzing trace with hash -350328107, now seen corresponding path program 9 times [2020-07-21 15:46:07,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:07,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957412470] [2020-07-21 15:46:07,595 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:07,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:07,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:07,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 15:46:07,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:08,045 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 7742 proven. 1596 refuted. 0 times theorem prover too weak. 5405 trivial. 0 not checked. [2020-07-21 15:46:08,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:10,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:11,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:12,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:13,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:13,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:13,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:13,232 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 1220 proven. 3406 refuted. 0 times theorem prover too weak. 10117 trivial. 0 not checked. [2020-07-21 15:46:13,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957412470] [2020-07-21 15:46:13,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:13,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 29 [2020-07-21 15:46:13,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802193208] [2020-07-21 15:46:13,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:46:13,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:13,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:46:13,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:46:13,235 INFO L87 Difference]: Start difference. First operand 86 states and 120 transitions. Second operand 29 states. [2020-07-21 15:46:14,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:14,454 INFO L93 Difference]: Finished difference Result 187 states and 314 transitions. [2020-07-21 15:46:14,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 15:46:14,460 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 504 [2020-07-21 15:46:14,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:14,462 INFO L225 Difference]: With dead ends: 187 [2020-07-21 15:46:14,462 INFO L226 Difference]: Without dead ends: 109 [2020-07-21 15:46:14,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 955 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=747, Invalid=2223, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 15:46:14,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-21 15:46:14,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 98. [2020-07-21 15:46:14,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 15:46:14,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 135 transitions. [2020-07-21 15:46:14,475 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 135 transitions. Word has length 504 [2020-07-21 15:46:14,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:14,476 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 135 transitions. [2020-07-21 15:46:14,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 15:46:14,476 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 135 transitions. [2020-07-21 15:46:14,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 15:46:14,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:14,480 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:14,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:14,695 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:14,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:14,695 INFO L82 PathProgramCache]: Analyzing trace with hash -229001048, now seen corresponding path program 10 times [2020-07-21 15:46:14,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:14,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068653727] [2020-07-21 15:46:14,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:14,970 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:14,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:14,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:46:14,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:15,144 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2270 refuted. 0 times theorem prover too weak. 9756 trivial. 0 not checked. [2020-07-21 15:46:15,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:17,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:17,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:17,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:17,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:19,075 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2347 refuted. 0 times theorem prover too weak. 9679 trivial. 0 not checked. [2020-07-21 15:46:19,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068653727] [2020-07-21 15:46:19,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:19,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 15:46:19,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591113110] [2020-07-21 15:46:19,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:46:19,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:19,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:46:19,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:46:19,078 INFO L87 Difference]: Start difference. First operand 98 states and 135 transitions. Second operand 21 states. [2020-07-21 15:46:19,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:19,401 INFO L93 Difference]: Finished difference Result 107 states and 153 transitions. [2020-07-21 15:46:19,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:46:19,402 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 463 [2020-07-21 15:46:19,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:19,405 INFO L225 Difference]: With dead ends: 107 [2020-07-21 15:46:19,405 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 15:46:19,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 890 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 15:46:19,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 15:46:19,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-21 15:46:19,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-21 15:46:19,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 149 transitions. [2020-07-21 15:46:19,419 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 149 transitions. Word has length 463 [2020-07-21 15:46:19,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:19,423 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 149 transitions. [2020-07-21 15:46:19,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:46:19,423 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 149 transitions. [2020-07-21 15:46:19,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-21 15:46:19,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:19,433 INFO L422 BasicCegarLoop]: trace histogram [145, 145, 117, 72, 72, 72, 72, 72, 72, 72, 45, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:19,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:19,634 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:19,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:19,636 INFO L82 PathProgramCache]: Analyzing trace with hash -928557949, now seen corresponding path program 11 times [2020-07-21 15:46:19,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:19,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583096878] [2020-07-21 15:46:19,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:19,998 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:19,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:20,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 1485 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 15:46:20,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:20,798 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 29376 proven. 4650 refuted. 0 times theorem prover too weak. 24744 trivial. 0 not checked. [2020-07-21 15:46:20,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:26,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:26,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:27,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:27,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:27,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:28,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:28,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:28,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:28,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:30,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:31,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:31,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:31,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:31,646 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 2815 proven. 9221 refuted. 0 times theorem prover too weak. 46734 trivial. 0 not checked. [2020-07-21 15:46:31,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583096878] [2020-07-21 15:46:31,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:31,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 33] total 37 [2020-07-21 15:46:31,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693685639] [2020-07-21 15:46:31,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 15:46:31,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:31,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 15:46:31,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1124, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 15:46:31,651 INFO L87 Difference]: Start difference. First operand 103 states and 149 transitions. Second operand 37 states. [2020-07-21 15:46:33,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:33,508 INFO L93 Difference]: Finished difference Result 257 states and 498 transitions. [2020-07-21 15:46:33,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 15:46:33,509 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 994 [2020-07-21 15:46:33,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:33,514 INFO L225 Difference]: With dead ends: 257 [2020-07-21 15:46:33,514 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 15:46:33,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2023 GetRequests, 1923 SyntacticMatches, 29 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1231, Invalid=4025, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 15:46:33,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 15:46:33,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 129. [2020-07-21 15:46:33,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-21 15:46:33,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 186 transitions. [2020-07-21 15:46:33,529 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 186 transitions. Word has length 994 [2020-07-21 15:46:33,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:33,530 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 186 transitions. [2020-07-21 15:46:33,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 15:46:33,530 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 186 transitions. [2020-07-21 15:46:33,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 750 [2020-07-21 15:46:33,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:33,536 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 88, 54, 54, 54, 54, 54, 54, 54, 34, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:33,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:33,737 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:33,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:33,738 INFO L82 PathProgramCache]: Analyzing trace with hash -127293739, now seen corresponding path program 12 times [2020-07-21 15:46:33,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:33,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005613630] [2020-07-21 15:46:33,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:34,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:34,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:34,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 1664 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:46:34,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:34,535 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4380 refuted. 0 times theorem prover too weak. 28057 trivial. 0 not checked. [2020-07-21 15:46:34,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:37,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:39,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:39,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:40,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:41,158 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4480 refuted. 0 times theorem prover too weak. 27957 trivial. 0 not checked. [2020-07-21 15:46:41,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005613630] [2020-07-21 15:46:41,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:41,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 15:46:41,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082377626] [2020-07-21 15:46:41,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:46:41,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:41,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:46:41,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:46:41,161 INFO L87 Difference]: Start difference. First operand 129 states and 186 transitions. Second operand 23 states. [2020-07-21 15:46:41,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:41,454 INFO L93 Difference]: Finished difference Result 136 states and 198 transitions. [2020-07-21 15:46:41,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:46:41,455 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 749 [2020-07-21 15:46:41,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:41,459 INFO L225 Difference]: With dead ends: 136 [2020-07-21 15:46:41,459 INFO L226 Difference]: Without dead ends: 132 [2020-07-21 15:46:41,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1458 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 15:46:41,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-21 15:46:41,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2020-07-21 15:46:41,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-21 15:46:41,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 194 transitions. [2020-07-21 15:46:41,472 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 194 transitions. Word has length 749 [2020-07-21 15:46:41,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:41,473 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 194 transitions. [2020-07-21 15:46:41,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:46:41,473 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 194 transitions. [2020-07-21 15:46:41,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2098 [2020-07-21 15:46:41,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:41,513 INFO L422 BasicCegarLoop]: trace histogram [307, 307, 248, 153, 153, 153, 153, 153, 153, 153, 95, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:41,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:41,728 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:41,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:41,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1575583038, now seen corresponding path program 13 times [2020-07-21 15:46:41,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:41,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612030116] [2020-07-21 15:46:41,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:46:42,419 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:42,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:42,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 3127 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 15:46:42,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:44,508 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25169 refuted. 0 times theorem prover too weak. 228276 trivial. 0 not checked. [2020-07-21 15:46:44,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:56,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:59,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:01,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:01,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:03,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:05,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:07,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:07,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:08,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:08,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:08,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:09,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:09,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:09,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:09,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:09,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:13,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:13,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:14,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:14,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:15,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:15,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:16,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:16,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:16,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:16,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:17,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:17,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:17,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:18,870 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25491 refuted. 0 times theorem prover too weak. 227954 trivial. 0 not checked. [2020-07-21 15:47:18,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612030116] [2020-07-21 15:47:18,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:47:18,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 51 [2020-07-21 15:47:18,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79016583] [2020-07-21 15:47:18,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 15:47:18,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:47:18,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 15:47:18,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=2165, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 15:47:18,876 INFO L87 Difference]: Start difference. First operand 132 states and 194 transitions. Second operand 51 states. [2020-07-21 15:47:24,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:47:24,939 INFO L93 Difference]: Finished difference Result 415 states and 1048 transitions. [2020-07-21 15:47:24,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 15:47:24,940 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 2097 [2020-07-21 15:47:24,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:47:24,946 INFO L225 Difference]: With dead ends: 415 [2020-07-21 15:47:24,946 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 15:47:24,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4251 GetRequests, 4101 SyntacticMatches, 43 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3181 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2775, Invalid=8997, Unknown=0, NotChecked=0, Total=11772 [2020-07-21 15:47:24,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 15:47:24,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 218. [2020-07-21 15:47:24,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-21 15:47:24,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 372 transitions. [2020-07-21 15:47:24,977 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 372 transitions. Word has length 2097 [2020-07-21 15:47:24,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:47:24,978 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 372 transitions. [2020-07-21 15:47:24,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 15:47:24,978 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 372 transitions. [2020-07-21 15:47:24,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-21 15:47:24,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:47:24,991 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 143, 88, 88, 88, 88, 88, 88, 88, 55, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:47:25,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:25,204 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:47:25,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:47:25,205 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 14 times [2020-07-21 15:47:25,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:47:25,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473008758] [2020-07-21 15:47:25,206 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:47:26,017 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:47:26,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:47:26,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 2692 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:47:26,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:47:26,761 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8218 refuted. 0 times theorem prover too weak. 78387 trivial. 0 not checked. [2020-07-21 15:47:26,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:47:33,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:35,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:35,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:36,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:36,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:37,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:37,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:38,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:38,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:38,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:39,864 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8344 refuted. 0 times theorem prover too weak. 78261 trivial. 0 not checked. [2020-07-21 15:47:39,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473008758] [2020-07-21 15:47:39,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:47:39,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 15:47:39,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84049032] [2020-07-21 15:47:39,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:47:39,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:47:39,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:47:39,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:47:39,867 INFO L87 Difference]: Start difference. First operand 218 states and 372 transitions. Second operand 25 states. [2020-07-21 15:47:40,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:47:40,384 INFO L93 Difference]: Finished difference Result 222 states and 375 transitions. [2020-07-21 15:47:40,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:47:40,385 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1212 [2020-07-21 15:47:40,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:47:40,391 INFO L225 Difference]: With dead ends: 222 [2020-07-21 15:47:40,391 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 15:47:40,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2433 GetRequests, 2380 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 15:47:40,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 15:47:40,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 218. [2020-07-21 15:47:40,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-21 15:47:40,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 371 transitions. [2020-07-21 15:47:40,411 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 371 transitions. Word has length 1212 [2020-07-21 15:47:40,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:47:40,412 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 371 transitions. [2020-07-21 15:47:40,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:47:40,412 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 371 transitions. [2020-07-21 15:47:40,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1962 [2020-07-21 15:47:40,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:47:40,446 INFO L422 BasicCegarLoop]: trace histogram [287, 287, 232, 143, 143, 143, 143, 143, 143, 143, 89, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:47:40,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:40,661 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:47:40,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:47:40,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1868832152, now seen corresponding path program 15 times [2020-07-21 15:47:40,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:47:40,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206467665] [2020-07-21 15:47:40,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:47:41,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:47:41,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:47:41,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 4355 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 15:47:41,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:47:43,557 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15097 refuted. 0 times theorem prover too weak. 214468 trivial. 0 not checked. [2020-07-21 15:47:43,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:47:53,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:47:57,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:00,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:01,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:03,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:03,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:03,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:03,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:04,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15252 refuted. 0 times theorem prover too weak. 214313 trivial. 0 not checked. [2020-07-21 15:48:05,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206467665] [2020-07-21 15:48:05,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:48:05,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 15:48:05,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234883522] [2020-07-21 15:48:05,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:48:05,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:48:05,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:48:05,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:48:05,998 INFO L87 Difference]: Start difference. First operand 218 states and 371 transitions. Second operand 27 states. [2020-07-21 15:48:06,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:48:06,613 INFO L93 Difference]: Finished difference Result 225 states and 390 transitions. [2020-07-21 15:48:06,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:48:06,616 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1961 [2020-07-21 15:48:06,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:48:06,623 INFO L225 Difference]: With dead ends: 225 [2020-07-21 15:48:06,623 INFO L226 Difference]: Without dead ends: 221 [2020-07-21 15:48:06,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3932 GetRequests, 3874 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 15:48:06,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-21 15:48:06,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2020-07-21 15:48:06,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2020-07-21 15:48:06,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 384 transitions. [2020-07-21 15:48:06,643 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 384 transitions. Word has length 1961 [2020-07-21 15:48:06,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:48:06,645 INFO L479 AbstractCegarLoop]: Abstraction has 221 states and 384 transitions. [2020-07-21 15:48:06,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:48:06,645 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 384 transitions. [2020-07-21 15:48:06,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3923 [2020-07-21 15:48:06,813 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:48:06,814 INFO L422 BasicCegarLoop]: trace histogram [575, 575, 465, 287, 287, 287, 287, 287, 287, 287, 178, 110, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:48:07,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:48:07,016 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:48:07,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:48:07,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1437984220, now seen corresponding path program 16 times [2020-07-21 15:48:07,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:48:07,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470587156] [2020-07-21 15:48:07,019 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:48:08,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:48:08,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:48:08,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 5847 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 15:48:08,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:48:14,566 INFO L134 CoverageAnalysis]: Checked inductivity of 932144 backedges. 22882 proven. 47998 refuted. 0 times theorem prover too weak. 861264 trivial. 0 not checked. [2020-07-21 15:48:14,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:48:33,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:38,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:38,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:41,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:41,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:43,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:44,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:44,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:45,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:46,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:48:47,502 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 15:48:51,326 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:49:01,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:06,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:10,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:10,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:12,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:12,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:14,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:15,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:15,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:15,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:16,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:16,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:16,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:16,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:16,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:22,044 INFO L134 CoverageAnalysis]: Checked inductivity of 932144 backedges. 22882 proven. 48308 refuted. 0 times theorem prover too weak. 860954 trivial. 0 not checked. [2020-07-21 15:49:22,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470587156] [2020-07-21 15:49:22,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:49:22,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 49 [2020-07-21 15:49:22,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484289073] [2020-07-21 15:49:22,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-21 15:49:22,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:22,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-21 15:49:22,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1993, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 15:49:22,050 INFO L87 Difference]: Start difference. First operand 221 states and 384 transitions. Second operand 49 states. [2020-07-21 15:49:28,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:49:28,106 INFO L93 Difference]: Finished difference Result 482 states and 856 transitions. [2020-07-21 15:49:28,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-21 15:49:28,110 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 3922 [2020-07-21 15:49:28,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:49:28,116 INFO L225 Difference]: With dead ends: 482 [2020-07-21 15:49:28,116 INFO L226 Difference]: Without dead ends: 269 [2020-07-21 15:49:28,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7894 GetRequests, 7751 SyntacticMatches, 45 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2552 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2267, Invalid=7633, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 15:49:28,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-07-21 15:49:28,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 205. [2020-07-21 15:49:28,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-21 15:49:28,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 326 transitions. [2020-07-21 15:49:28,140 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 326 transitions. Word has length 3922 [2020-07-21 15:49:28,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:49:28,143 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 326 transitions. [2020-07-21 15:49:28,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-21 15:49:28,143 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 326 transitions. [2020-07-21 15:49:28,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3174 [2020-07-21 15:49:28,240 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:49:28,242 INFO L422 BasicCegarLoop]: trace histogram [465, 465, 376, 232, 232, 232, 232, 232, 232, 232, 144, 89, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:49:28,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:28,457 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:49:28,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:49:28,459 INFO L82 PathProgramCache]: Analyzing trace with hash -740538915, now seen corresponding path program 17 times [2020-07-21 15:49:28,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:49:28,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864748876] [2020-07-21 15:49:28,460 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:49:30,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:49:30,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:49:30,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 7046 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 15:49:30,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:34,596 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27297 refuted. 0 times theorem prover too weak. 578507 trivial. 0 not checked. [2020-07-21 15:49:34,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:49:37,998 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:49:39,276 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:49:39,381 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:49:41,084 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:49:41,200 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:49:41,321 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:49:41,436 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:49:41,556 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 15:49:41,674 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 15:49:41,786 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 15:49:57,529 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:49:57,640 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:49:58,921 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:49:59,029 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:49:59,133 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:49:59,251 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:49:59,368 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:49:59,476 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:50:00,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:00,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:10,268 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:50:10,390 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:50:10,510 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:50:10,630 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:50:11,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,729 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:50:18,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:18,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:23,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:23,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:26,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:28,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:29,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:29,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:31,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:31,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:34,682 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27484 refuted. 0 times theorem prover too weak. 578320 trivial. 0 not checked. [2020-07-21 15:50:34,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864748876] [2020-07-21 15:50:34,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:34,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 15:50:34,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022165143] [2020-07-21 15:50:34,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:50:34,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:34,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:50:34,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:50:34,690 INFO L87 Difference]: Start difference. First operand 205 states and 326 transitions. Second operand 29 states. [2020-07-21 15:50:36,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:36,116 INFO L93 Difference]: Finished difference Result 209 states and 329 transitions. [2020-07-21 15:50:36,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 15:50:36,123 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 3173 [2020-07-21 15:50:36,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:36,129 INFO L225 Difference]: With dead ends: 209 [2020-07-21 15:50:36,129 INFO L226 Difference]: Without dead ends: 205 [2020-07-21 15:50:36,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6357 GetRequests, 6294 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 15:50:36,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-21 15:50:36,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2020-07-21 15:50:36,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-21 15:50:36,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 325 transitions. [2020-07-21 15:50:36,153 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 325 transitions. Word has length 3173 [2020-07-21 15:50:36,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:36,156 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 325 transitions. [2020-07-21 15:50:36,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 15:50:36,157 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 325 transitions. [2020-07-21 15:50:36,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5135 [2020-07-21 15:50:36,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:36,395 INFO L422 BasicCegarLoop]: trace histogram [753, 753, 609, 376, 376, 376, 376, 376, 376, 376, 233, 144, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:36,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:36,597 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:36,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:36,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1603623985, now seen corresponding path program 18 times [2020-07-21 15:50:36,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:36,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607821356] [2020-07-21 15:50:36,600 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:50:39,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:39,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:39,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 11400 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 15:50:39,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:48,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48748 refuted. 0 times theorem prover too weak. 1545214 trivial. 0 not checked. [2020-07-21 15:50:48,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:52,763 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:50:52,871 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:50:54,126 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:50:54,358 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:50:54,509 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:50:56,524 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:50:56,651 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:50:56,779 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:50:56,903 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:51:00,488 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:51:00,640 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:51:00,832 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:51:01,022 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:51:01,177 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 15:51:01,315 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 15:51:01,438 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 15:51:01,578 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 15:51:01,704 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:51:01,820 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:51:01,927 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:51:02,039 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 15:51:02,149 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:51:30,784 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:51:30,896 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:51:31,774 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:51:31,893 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:51:32,025 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:51:32,143 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:51:33,657 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:51:33,778 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:51:33,894 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:51:34,002 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:51:36,128 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:51:36,275 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:51:36,422 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:51:36,556 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:51:36,695 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 15:51:36,857 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 15:51:36,988 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:51:37,115 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:51:37,234 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:51:37,339 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:51:37,445 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:51:38,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:38,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:56,255 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:51:58,045 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:51:58,151 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:51:58,267 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:51:58,371 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:51:59,916 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:52:00,026 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:52:00,144 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:52:00,249 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:52:00,361 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:52:00,856 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:52:01,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:01,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:12,721 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:52:13,740 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:52:13,854 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:52:13,980 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:52:14,100 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:52:14,206 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:52:14,312 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:52:14,520 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 15:52:14,630 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:52:15,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:15,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:23,634 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:52:23,845 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:52:23,978 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:52:24,100 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:52:24,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:29,707 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:52:29,814 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:52:30,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:34,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:34,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:36,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:38,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:38,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:39,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:39,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:39,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:39,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:39,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:49,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48970 refuted. 0 times theorem prover too weak. 1544992 trivial. 0 not checked. [2020-07-21 15:52:49,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607821356] [2020-07-21 15:52:49,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:49,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 15:52:49,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756195296] [2020-07-21 15:52:49,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 15:52:49,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:49,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 15:52:49,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 15:52:49,596 INFO L87 Difference]: Start difference. First operand 205 states and 325 transitions. Second operand 31 states. [2020-07-21 15:52:50,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:50,777 INFO L93 Difference]: Finished difference Result 212 states and 342 transitions. [2020-07-21 15:52:50,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:52:50,782 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 5134 [2020-07-21 15:52:50,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:50,791 INFO L225 Difference]: With dead ends: 212 [2020-07-21 15:52:50,791 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 15:52:50,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10280 GetRequests, 10212 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 15:52:50,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 15:52:50,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2020-07-21 15:52:50,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 15:52:50,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-21 15:52:50,813 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 5134 [2020-07-21 15:52:50,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:50,818 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-21 15:52:50,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 15:52:50,818 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-21 15:52:51,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8308 [2020-07-21 15:52:51,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:51,272 INFO L422 BasicCegarLoop]: trace histogram [1219, 1219, 986, 609, 609, 609, 609, 609, 609, 609, 377, 233, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:51,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:51,473 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:51,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:51,477 INFO L82 PathProgramCache]: Analyzing trace with hash -497867032, now seen corresponding path program 19 times [2020-07-21 15:52:51,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:51,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822814201] [2020-07-21 15:52:51,478 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:52:55,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:52:55,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:55,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 18445 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 15:52:55,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:22,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86206 refuted. 0 times theorem prover too weak. 4100007 trivial. 0 not checked. [2020-07-21 15:53:22,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:24,822 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:53:25,584 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:53:25,700 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:53:25,822 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:53:25,935 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:53:27,146 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:53:27,267 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:53:27,397 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:53:27,538 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:53:29,370 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:53:29,512 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:53:29,653 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:53:29,785 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:53:32,514 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:53:32,649 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:53:32,826 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:33,006 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:37,663 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:53:37,824 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:53:38,021 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:38,217 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:46,034 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:53:46,245 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:53:46,482 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 15:53:46,710 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 15:53:46,948 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-21 15:53:47,162 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-21 15:53:47,364 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 15:53:47,563 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 15:53:47,755 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 15:53:47,915 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 15:53:48,070 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:53:48,264 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:53:48,398 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:53:48,523 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:53:48,640 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:48,756 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:53:48,874 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:54:50,877 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:54:51,670 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:54:51,783 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:54:51,923 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:54:52,066 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:54:53,302 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:54:53,436 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:54:53,565 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:54:53,688 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:54:55,613 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:54:55,771 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:54:55,952 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:54:56,126 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:54:59,314 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:54:59,489 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:54:59,669 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:54:59,849 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:55:04,913 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:55:05,097 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:55:05,282 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:55:05,469 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:55:05,687 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 15:55:05,873 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-21 15:55:06,063 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 15:55:06,232 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 15:55:06,401 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:55:06,544 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 15:55:06,696 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 15:55:06,835 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:55:06,962 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 15:55:07,088 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:55:07,210 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 15:55:07,317 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:55:07,519 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:55:07,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:47,873 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:55:48,853 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:55:48,961 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:55:49,707 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:55:49,818 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:55:49,942 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:55:50,057 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:55:51,295 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:55:51,433 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:55:51,589 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:55:51,738 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:55:53,838 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:55:53,999 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:55:54,167 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:55:54,324 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:55:57,576 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:55:57,739 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:55:57,918 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:55:58,091 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:55:58,281 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 15:55:58,439 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 15:55:58,591 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:55:58,738 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 15:55:58,874 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:55:59,005 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:55:59,134 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:55:59,249 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:55:59,364 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:55:59,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:06,591 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 15:56:21,955 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:56:22,803 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:56:22,907 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:56:23,467 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:56:23,583 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:56:23,694 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:56:23,806 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:56:24,786 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:56:24,915 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:56:25,057 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:56:25,206 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:56:26,543 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:56:26,690 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:56:26,850 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:56:27,025 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:56:29,170 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:56:29,319 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:56:29,481 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:56:29,660 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:56:29,837 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:56:30,002 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:56:30,158 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:56:30,288 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:56:30,407 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 15:56:30,514 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 15:56:31,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:31,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:46,045 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:56:46,160 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:56:46,274 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:56:46,390 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:56:47,228 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:56:47,345 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:56:47,470 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:56:47,596 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:56:48,881 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:56:49,036 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:56:49,195 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:56:49,357 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:56:49,495 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 15:56:49,628 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:56:49,743 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:56:49,853 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:56:49,963 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:56:50,067 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:56:50,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:59,302 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:56:59,615 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:57:00,226 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:57:00,332 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:57:00,451 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:57:00,564 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:57:01,409 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:57:01,539 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:57:01,665 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:57:01,800 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:57:01,934 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:57:02,067 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:57:02,188 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:57:02,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:08,029 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 15:57:08,137 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 15:57:08,578 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:57:08,698 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:57:08,825 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:57:08,945 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:57:09,591 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:57:09,720 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 15:57:09,862 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:57:09,985 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 15:57:10,108 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:57:10,231 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:57:10,350 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 15:57:10,459 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:57:10,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:10,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:15,184 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 15:57:15,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:15,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:18,109 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 15:57:18,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:18,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:20,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:21,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:22,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:22,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:22,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:22,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:50,510 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86466 refuted. 0 times theorem prover too weak. 4099747 trivial. 0 not checked. [2020-07-21 15:57:50,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822814201] [2020-07-21 15:57:50,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:57:50,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 32 [2020-07-21 15:57:50,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715111189] [2020-07-21 15:57:50,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 15:57:50,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:57:50,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 15:57:50,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=721, Unknown=0, NotChecked=0, Total=992 [2020-07-21 15:57:50,522 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 32 states. [2020-07-21 15:57:52,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:57:52,591 INFO L93 Difference]: Finished difference Result 217 states and 362 transitions. [2020-07-21 15:57:52,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 15:57:52,600 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 8307 [2020-07-21 15:57:52,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:57:52,614 INFO L225 Difference]: With dead ends: 217 [2020-07-21 15:57:52,615 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 15:57:52,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16627 GetRequests, 16554 SyntacticMatches, 29 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=705, Invalid=1365, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 15:57:52,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 15:57:52,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2020-07-21 15:57:52,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-21 15:57:52,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 358 transitions. [2020-07-21 15:57:52,645 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 358 transitions. Word has length 8307 [2020-07-21 15:57:52,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:57:52,653 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 358 transitions. [2020-07-21 15:57:52,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 15:57:52,654 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 358 transitions. [2020-07-21 15:57:54,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13442 [2020-07-21 15:57:54,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:57:54,348 INFO L422 BasicCegarLoop]: trace histogram [1973, 1973, 1596, 986, 986, 986, 986, 986, 986, 986, 610, 377, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:57:54,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:54,549 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:57:54,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:57:54,554 INFO L82 PathProgramCache]: Analyzing trace with hash -982105371, now seen corresponding path program 20 times [2020-07-21 15:57:54,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:57:54,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519971587] [2020-07-21 15:57:54,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:58:01,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:01,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:01,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 29844 conjuncts, 7895 conjunts are in the unsatisfiable core [2020-07-21 15:58:01,985 INFO L286 TraceCheckSpWp]: Computing forward predicates...