/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:45:20,385 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:45:20,390 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:45:20,417 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:45:20,417 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:45:20,420 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:45:20,423 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:45:20,426 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:45:20,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:45:20,431 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:45:20,433 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:45:20,435 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:45:20,435 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:45:20,436 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:45:20,437 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:45:20,439 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:45:20,441 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:45:20,444 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:45:20,446 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:45:20,450 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:45:20,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:45:20,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:45:20,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:45:20,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:45:20,458 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 00:45:20,459 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 00:45:20,459 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 00:45:20,461 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 00:45:20,462 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 00:45:20,463 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 00:45:20,464 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 00:45:20,466 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 00:45:20,467 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 00:45:20,470 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 00:45:20,472 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 00:45:20,473 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 00:45:20,474 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 00:45:20,474 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 00:45:20,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 00:45:20,476 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 00:45:20,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 00:45:20,480 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 00:45:20,503 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:45:20,504 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:45:20,507 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:45:20,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:45:20,512 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:45:20,512 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:45:20,512 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:45:20,512 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:45:20,512 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:45:20,513 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:45:20,513 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:45:20,513 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:45:20,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:45:20,516 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:45:20,516 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:45:20,517 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:45:20,517 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:45:20,517 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:45:20,518 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:45:20,518 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:45:20,518 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:45:20,518 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:45:20,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:45:20,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:45:20,519 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:45:20,519 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:45:20,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:20,520 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:45:20,520 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:45:20,520 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 00:45:21,058 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:45:21,097 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:45:21,103 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:45:21,106 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:45:21,107 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:45:21,109 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 00:45:21,263 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7e68886c0/a05a0fa986db4d1d9d260be2b8b83da2/FLAG283d52374 [2020-07-21 00:45:22,034 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:45:22,035 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 00:45:22,048 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7e68886c0/a05a0fa986db4d1d9d260be2b8b83da2/FLAG283d52374 [2020-07-21 00:45:22,074 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7e68886c0/a05a0fa986db4d1d9d260be2b8b83da2 [2020-07-21 00:45:22,094 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:45:22,099 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:45:22,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:45:22,102 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:45:22,109 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:45:22,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bdabeeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22, skipping insertion in model container [2020-07-21 00:45:22,119 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:45:22,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:45:22,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:45:22,504 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:45:22,523 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:45:22,540 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:45:22,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22 WrapperNode [2020-07-21 00:45:22,542 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:45:22,544 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:45:22,544 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:45:22,545 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:45:22,561 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,570 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,571 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,579 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,581 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (1/1) ... [2020-07-21 00:45:22,584 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:45:22,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:45:22,585 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:45:22,586 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:45:22,587 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (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 00:45:22,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:45:22,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:45:22,819 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:45:22,819 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:45:22,819 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:45:22,820 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:45:22,820 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:45:22,820 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:45:22,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:45:22,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:45:23,094 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:45:23,094 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:45:23,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:45:23 BoogieIcfgContainer [2020-07-21 00:45:23,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:45:23,106 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:45:23,106 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:45:23,113 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:45:23,113 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:45:22" (1/3) ... [2020-07-21 00:45:23,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bdc0b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:45:23, skipping insertion in model container [2020-07-21 00:45:23,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:45:22" (2/3) ... [2020-07-21 00:45:23,117 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bdc0b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:45:23, skipping insertion in model container [2020-07-21 00:45:23,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:45:23" (3/3) ... [2020-07-21 00:45:23,120 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-21 00:45:23,141 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:45:23,156 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:45:23,181 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:45:23,255 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:45:23,256 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:45:23,256 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:45:23,256 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:45:23,256 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:45:23,257 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:45:23,257 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:45:23,257 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:45:23,305 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:45:23,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:45:23,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:23,323 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:23,324 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:23,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:23,339 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:45:23,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:23,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839778755] [2020-07-21 00:45:23,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:23,459 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:23,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:23,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:45:23,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:23,626 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 00:45:23,627 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:45:23,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839778755] [2020-07-21 00:45:23,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:45:23,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:45:23,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445106915] [2020-07-21 00:45:23,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:45:23,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:23,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:45:23,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:45:23,666 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:45:23,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:23,844 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:45:23,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:45:23,849 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:45:23,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:23,868 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:45:23,869 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:45:23,877 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 00:45:23,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:45:23,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:45:23,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:45:23,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:45:23,953 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:45:23,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:23,955 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:45:23,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:45:23,955 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:45:23,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:45:23,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:23,958 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:24,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:24,175 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:24,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:24,176 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:45:24,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:24,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453318591] [2020-07-21 00:45:24,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:24,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:45:24,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:24,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:45:24,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:24,268 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 00:45:24,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:45:24,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453318591] [2020-07-21 00:45:24,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:45:24,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:45:24,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440484535] [2020-07-21 00:45:24,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:45:24,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:24,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:45:24,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:45:24,277 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:45:24,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:24,384 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:45:24,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:45:24,386 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:45:24,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:24,389 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:45:24,389 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:45:24,391 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 00:45:24,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:45:24,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:45:24,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:45:24,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:45:24,402 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:45:24,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:24,402 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:45:24,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:45:24,403 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:45:24,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:45:24,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:24,405 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 00:45:24,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:24,620 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:24,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:24,623 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:45:24,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:24,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695614469] [2020-07-21 00:45:24,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:24,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:24,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:24,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:45:24,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:24,759 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 00:45:24,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:25,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:25,143 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 00:45:25,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695614469] [2020-07-21 00:45:25,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:25,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:45:25,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184117211] [2020-07-21 00:45:25,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:45:25,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:25,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:45:25,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:45:25,148 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:45:25,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:25,381 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:45:25,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:45:25,383 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:45:25,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:25,385 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:45:25,386 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:45:25,388 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 00:45:25,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:45:25,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:45:25,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:45:25,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:45:25,402 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:45:25,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:25,403 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:45:25,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:45:25,403 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:45:25,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:45:25,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:25,406 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 00:45:25,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:25,622 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:25,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:25,623 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:45:25,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:25,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136006931] [2020-07-21 00:45:25,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:25,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:25,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:25,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:45:25,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:25,719 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 00:45:25,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:25,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:26,011 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 00:45:26,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136006931] [2020-07-21 00:45:26,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:26,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:45:26,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499609701] [2020-07-21 00:45:26,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:45:26,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:26,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:45:26,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:45:26,015 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:45:26,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:26,178 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:45:26,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:45:26,180 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:45:26,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:26,183 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:45:26,183 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:45:26,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:45:26,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:45:26,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:45:26,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:45:26,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:45:26,199 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:45:26,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:26,200 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:45:26,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:45:26,200 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:45:26,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:45:26,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:26,203 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 00:45:26,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:26,420 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:26,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:26,421 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:45:26,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:26,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031875915] [2020-07-21 00:45:26,425 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:26,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:26,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:26,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:45:26,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:26,559 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 00:45:26,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:26,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:26,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:26,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:26,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:27,035 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 00:45:27,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031875915] [2020-07-21 00:45:27,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:27,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:45:27,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070696004] [2020-07-21 00:45:27,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:45:27,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:27,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:45:27,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:45:27,039 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:45:27,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:27,298 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:45:27,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:45:27,299 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:45:27,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:27,302 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:45:27,302 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:45:27,303 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 00:45:27,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:45:27,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:45:27,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:45:27,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:45:27,317 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:45:27,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:27,317 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:45:27,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:45:27,318 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:45:27,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:45:27,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:27,321 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 00:45:27,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:27,526 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:27,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:27,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:45:27,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:27,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194351482] [2020-07-21 00:45:27,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:27,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:27,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:27,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:45:27,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:27,673 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 00:45:27,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:27,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:28,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:28,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:28,127 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 00:45:28,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194351482] [2020-07-21 00:45:28,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:28,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:45:28,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501729469] [2020-07-21 00:45:28,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:45:28,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:28,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:45:28,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:45:28,133 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:45:28,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:28,331 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:45:28,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:45:28,333 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:45:28,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:28,343 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:45:28,343 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:45:28,345 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 00:45:28,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:45:28,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:45:28,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:45:28,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:45:28,383 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:45:28,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:28,386 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:45:28,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:45:28,387 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:45:28,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:45:28,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:28,399 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 00:45:28,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:28,617 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:28,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:28,618 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:45:28,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:28,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217145687] [2020-07-21 00:45:28,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:28,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:45:28,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:28,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:45:28,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:28,756 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 00:45:28,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:29,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,680 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 00:45:29,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217145687] [2020-07-21 00:45:29,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:29,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:45:29,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000288952] [2020-07-21 00:45:29,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:45:29,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:29,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:45:29,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:45:29,686 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:45:29,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:29,930 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:45:29,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:45:29,931 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:45:29,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:29,935 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:45:29,936 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:45:29,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:45:29,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:45:29,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:45:29,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:45:29,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:45:29,980 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:45:29,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:29,985 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:45:29,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:45:29,986 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:45:29,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:45:29,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:29,996 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 00:45:30,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:30,199 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:30,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:30,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:45:30,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:30,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164985651] [2020-07-21 00:45:30,200 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:30,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:30,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:30,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:45:30,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:30,330 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 00:45:30,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:30,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:31,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:31,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:31,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 00:45:31,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164985651] [2020-07-21 00:45:31,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:31,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:45:31,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139590538] [2020-07-21 00:45:31,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:45:31,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:31,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:45:31,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:45:31,241 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 00:45:31,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:31,431 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:45:31,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:45:31,435 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 00:45:31,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:31,439 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:45:31,440 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:45:31,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:45:31,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:45:31,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:45:31,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:45:31,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:45:31,460 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:45:31,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:31,461 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:45:31,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:45:31,461 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:45:31,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:45:31,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:31,464 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:31,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:31,680 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:31,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:31,682 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:45:31,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:31,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931530518] [2020-07-21 00:45:31,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:31,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:31,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:31,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:45:31,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:31,860 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 00:45:31,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:32,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:32,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:32,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:32,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:33,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:33,078 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:45:33,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931530518] [2020-07-21 00:45:33,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:33,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:45:33,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115263712] [2020-07-21 00:45:33,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:45:33,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:33,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:45:33,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:45:33,082 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 00:45:33,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:33,497 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:45:33,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:45:33,497 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 00:45:33,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:33,505 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:45:33,506 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:45:33,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:45:33,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:45:33,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:45:33,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:45:33,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:45:33,543 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:45:33,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:33,543 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:45:33,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:45:33,544 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:45:33,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:45:33,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:33,553 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:33,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:33,755 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:33,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:33,756 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:45:33,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:33,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030875315] [2020-07-21 00:45:33,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:33,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:33,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:33,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:45:33,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:33,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 00:45:33,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:34,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:34,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:34,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:34,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:34,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:34,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 00:45:35,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030875315] [2020-07-21 00:45:35,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:35,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:45:35,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194803059] [2020-07-21 00:45:35,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:45:35,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:35,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:45:35,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:45:35,056 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 00:45:35,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:35,231 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 00:45:35,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:45:35,232 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 00:45:35,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:35,237 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:45:35,237 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 00:45:35,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:45:35,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 00:45:35,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 00:45:35,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:45:35,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:45:35,253 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 00:45:35,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:35,253 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:45:35,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:45:35,254 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:45:35,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:45:35,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:35,258 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:35,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:35,472 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:35,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:35,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 00:45:35,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:35,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438491328] [2020-07-21 00:45:35,474 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:35,556 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:35,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:35,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:45:35,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:35,678 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 00:45:35,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:36,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:37,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 00:45:37,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438491328] [2020-07-21 00:45:37,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:37,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:45:37,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757264854] [2020-07-21 00:45:37,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:45:37,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:37,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:45:37,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:45:37,631 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 00:45:37,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:37,844 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 00:45:37,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:45:37,845 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 00:45:37,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:37,849 INFO L225 Difference]: With dead ends: 72 [2020-07-21 00:45:37,850 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:45:37,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:45:37,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:45:37,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 00:45:37,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:45:37,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:45:37,874 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 00:45:37,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:37,877 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:45:37,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:45:37,877 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:45:37,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 00:45:37,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:37,883 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:38,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:38,096 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:38,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:38,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 00:45:38,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:38,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40871017] [2020-07-21 00:45:38,098 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:38,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:38,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:38,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:45:38,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:38,311 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 00:45:38,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:39,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:39,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:40,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:40,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:40,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:40,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 00:45:40,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40871017] [2020-07-21 00:45:40,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:40,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:45:40,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898769993] [2020-07-21 00:45:40,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:45:40,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:40,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:45:40,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:45:40,261 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 00:45:40,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:40,488 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 00:45:40,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:45:40,489 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 00:45:40,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:40,496 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:45:40,497 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 00:45:40,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:45:40,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 00:45:40,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 00:45:40,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:45:40,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:45:40,522 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 00:45:40,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:40,523 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:45:40,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:45:40,523 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:45:40,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 00:45:40,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:40,537 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:40,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:40,750 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:40,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:40,751 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 00:45:40,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:40,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916738982] [2020-07-21 00:45:40,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:40,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:40,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:40,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:45:40,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:41,149 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 00:45:41,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:43,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:43,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:43,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:43,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:43,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:44,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:44,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:44,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:44,252 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 00:45:44,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916738982] [2020-07-21 00:45:44,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:44,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:45:44,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147441533] [2020-07-21 00:45:44,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:45:44,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:44,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:45:44,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:45:44,255 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 00:45:44,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:44,573 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 00:45:44,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:45:44,574 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 00:45:44,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:44,581 INFO L225 Difference]: With dead ends: 82 [2020-07-21 00:45:44,581 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:45:44,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 00:45:44,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:45:44,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 00:45:44,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:45:44,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:45:44,615 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 00:45:44,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:44,618 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:45:44,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:45:44,618 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:45:44,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 00:45:44,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:44,623 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:44,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:44,838 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:44,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:44,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 00:45:44,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:44,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146142392] [2020-07-21 00:45:44,840 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:44,973 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:44,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:44,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:45:44,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:45,242 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 00:45:45,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:46,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:48,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:48,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:48,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 00:45:48,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146142392] [2020-07-21 00:45:48,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:48,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:45:48,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981199969] [2020-07-21 00:45:48,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:45:48,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:48,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:45:48,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:45:48,243 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 00:45:48,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:48,765 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 00:45:48,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:45:48,766 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 00:45:48,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:48,769 INFO L225 Difference]: With dead ends: 87 [2020-07-21 00:45:48,769 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 00:45:48,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 00:45:48,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 00:45:48,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 00:45:48,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:45:48,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:45:48,785 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 00:45:48,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:48,787 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:45:48,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:45:48,787 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:45:48,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 00:45:48,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:48,802 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:49,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:49,018 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:49,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:49,019 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 00:45:49,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:49,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355784472] [2020-07-21 00:45:49,020 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:49,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:49,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:49,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:45:49,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:49,678 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 00:45:49,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:52,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:52,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:53,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:55,357 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 00:45:55,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355784472] [2020-07-21 00:45:55,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:55,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:45:55,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950507806] [2020-07-21 00:45:55,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:45:55,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:55,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:45:55,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:45:55,361 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 00:45:55,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:55,795 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 00:45:55,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:45:55,796 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 00:45:55,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:55,802 INFO L225 Difference]: With dead ends: 92 [2020-07-21 00:45:55,802 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 00:45:55,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:45:55,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 00:45:55,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 00:45:55,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:45:55,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:45:55,828 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 00:45:55,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:55,829 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:45:55,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:45:55,831 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:45:55,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 00:45:55,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:55,847 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:56,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:56,061 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:56,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:56,062 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 00:45:56,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:56,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31885948] [2020-07-21 00:45:56,063 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:56,311 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:56,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:56,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:45:56,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:56,917 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 00:45:56,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:46:00,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:00,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:01,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:02,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:03,344 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 00:46:03,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31885948] [2020-07-21 00:46:03,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:46:03,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:46:03,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959517454] [2020-07-21 00:46:03,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:46:03,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:03,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:46:03,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:46:03,348 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 00:46:03,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:03,914 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 00:46:03,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:46:03,915 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 00:46:03,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:03,921 INFO L225 Difference]: With dead ends: 97 [2020-07-21 00:46:03,921 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 00:46:03,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 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 00:46:03,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 00:46:03,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 00:46:03,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:46:03,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:46:03,948 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 00:46:03,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:03,950 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:46:03,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:46:03,950 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:46:03,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 00:46:03,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:03,975 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:04,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:04,190 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:04,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:04,192 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 00:46:04,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:04,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566021996] [2020-07-21 00:46:04,193 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:04,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:46:04,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:04,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 876 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:46:04,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:05,692 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 00:46:05,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:46:10,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:12,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:14,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:14,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:14,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:14,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:14,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:15,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:15,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:15,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:15,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:15,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:16,887 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 00:46:16,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566021996] [2020-07-21 00:46:16,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:46:16,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:46:16,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030334479] [2020-07-21 00:46:16,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:46:16,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:16,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:46:16,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:46:16,892 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 00:46:17,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:17,670 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 00:46:17,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:46:17,670 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 00:46:17,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:17,677 INFO L225 Difference]: With dead ends: 102 [2020-07-21 00:46:17,677 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 00:46:17,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:46:17,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 00:46:17,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 00:46:17,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:46:17,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:46:17,695 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 00:46:17,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:17,698 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:46:17,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:46:17,698 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:46:17,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 00:46:17,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:17,731 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:17,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:17,945 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:17,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:17,946 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 00:46:17,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:17,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030713897] [2020-07-21 00:46:17,947 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:18,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:46:18,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:18,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:46:18,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:19,896 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 00:46:19,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:46:25,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:27,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:27,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:29,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:29,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:30,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:31,964 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 00:46:31,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030713897] [2020-07-21 00:46:31,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:46:31,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:46:31,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429203585] [2020-07-21 00:46:31,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:46:31,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:31,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:46:31,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:46:31,968 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 00:46:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:32,479 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 00:46:32,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:46:32,480 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 00:46:32,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:32,486 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:46:32,487 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 00:46:32,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 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 00:46:32,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 00:46:32,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 00:46:32,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:46:32,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:46:32,504 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 00:46:32,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:32,505 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:46:32,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:46:32,506 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:46:32,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 00:46:32,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:32,542 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:32,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:32,755 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:32,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:32,757 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 00:46:32,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:32,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340349803] [2020-07-21 00:46:32,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:33,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:46:33,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:33,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:46:33,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:35,028 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 00:46:35,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:46:41,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:45,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:47,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:48,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:48,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:49,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:51,344 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 00:46:51,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340349803] [2020-07-21 00:46:51,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:46:51,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:46:51,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967408741] [2020-07-21 00:46:51,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:46:51,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:51,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:46:51,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:46:51,348 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 00:46:52,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:52,121 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 00:46:52,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:46:52,122 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 00:46:52,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:52,131 INFO L225 Difference]: With dead ends: 112 [2020-07-21 00:46:52,131 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 00:46:52,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:46:52,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 00:46:52,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 00:46:52,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:46:52,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:46:52,153 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 00:46:52,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:52,156 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:46:52,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:46:52,156 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:46:52,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 00:46:52,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:52,258 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:52,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:52,467 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:52,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:52,469 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 00:46:52,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:52,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785001053] [2020-07-21 00:46:52,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:52,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:46:52,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:52,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:46:53,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:54,911 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 00:46:54,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:47:02,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:06,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:08,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:08,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:08,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:09,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:09,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:10,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:10,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:10,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:10,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:10,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:12,051 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 00:47:12,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785001053] [2020-07-21 00:47:12,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:47:12,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:47:12,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683894166] [2020-07-21 00:47:12,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:47:12,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:47:12,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:47:12,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:47:12,055 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 00:47:12,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:47:12,863 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 00:47:12,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:47:12,864 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 00:47:12,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:47:12,870 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:47:12,871 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 00:47:12,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:47:12,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 00:47:12,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 00:47:12,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:47:12,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:47:12,894 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 00:47:12,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:47:12,895 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:47:12,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:47:12,896 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:47:13,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 00:47:13,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:47:13,003 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:47:13,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:13,205 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:47:13,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:47:13,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 00:47:13,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:47:13,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027719135] [2020-07-21 00:47:13,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:13,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:47:13,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:47:13,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 2216 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:47:14,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:47:19,414 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 00:47:19,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:47:34,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:34,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:42,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:45,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:47,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:48,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:49,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:49,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:49,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:50,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:50,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:50,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:55,494 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 00:47:55,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027719135] [2020-07-21 00:47:55,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:47:55,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:47:55,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579311199] [2020-07-21 00:47:55,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:47:55,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:47:55,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:47:55,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:47:55,500 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 00:47:56,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:47:56,756 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 00:47:56,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:47:56,757 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 00:47:56,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:47:56,766 INFO L225 Difference]: With dead ends: 122 [2020-07-21 00:47:56,766 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 00:47:56,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:47:56,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 00:47:56,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 00:47:56,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:47:56,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:47:56,790 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 00:47:56,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:47:56,793 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:47:56,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:47:56,793 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:47:57,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5131 [2020-07-21 00:47:57,065 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:47:57,067 INFO L422 BasicCegarLoop]: trace histogram [755, 755, 593, 377, 377, 377, 377, 377, 377, 377, 216, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:47:57,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:57,282 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:47:57,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:47:57,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1930612962, now seen corresponding path program 10 times [2020-07-21 00:47:57,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:47:57,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123347840] [2020-07-21 00:47:57,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:58,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:47:58,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:47:58,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 2846 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:47:58,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:48:07,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40602 refuted. 0 times theorem prover too weak. 1551693 trivial. 0 not checked. [2020-07-21 00:48:07,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:48:26,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:38,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:38,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:45,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:45,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:47,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:47,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:49,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:49,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:50,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:50,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:51,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:01,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40757 refuted. 0 times theorem prover too weak. 1551538 trivial. 0 not checked. [2020-07-21 00:49:01,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123347840] [2020-07-21 00:49:01,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:01,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:49:01,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453935265] [2020-07-21 00:49:01,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:49:01,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:01,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:49:01,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:49:01,097 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 00:49:03,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:03,079 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 00:49:03,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:49:03,084 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5130 [2020-07-21 00:49:03,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:03,094 INFO L225 Difference]: With dead ends: 127 [2020-07-21 00:49:03,094 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 00:49:03,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10270 GetRequests, 10212 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:49:03,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 00:49:03,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 00:49:03,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:49:03,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:49:03,121 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5130 [2020-07-21 00:49:03,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:03,125 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:49:03,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:49:03,125 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:49:03,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9634 [2020-07-21 00:49:03,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:03,655 INFO L422 BasicCegarLoop]: trace histogram [1481, 1481, 741, 740, 740, 740, 740, 740, 740, 740, 740, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:03,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:03,856 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:03,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:03,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1675983471, now seen corresponding path program 11 times [2020-07-21 00:49:03,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:03,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770710748] [2020-07-21 00:49:03,861 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:05,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:49:05,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:05,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 5367 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:49:05,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:36,529 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82758 refuted. 0 times theorem prover too weak. 5657634 trivial. 0 not checked. [2020-07-21 00:49:36,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:17,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:46,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:11,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:14,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:14,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:15,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:15,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:47,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82934 refuted. 0 times theorem prover too weak. 5657458 trivial. 0 not checked. [2020-07-21 00:51:47,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770710748] [2020-07-21 00:51:47,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:47,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:51:47,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661992866] [2020-07-21 00:51:47,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:51:47,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:47,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:51:47,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:51:47,851 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 00:51:50,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:50,252 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 00:51:50,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:51:50,253 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9633 [2020-07-21 00:51:50,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:50,269 INFO L225 Difference]: With dead ends: 132 [2020-07-21 00:51:50,269 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 00:51:50,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19278 GetRequests, 19215 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:51:50,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 00:51:50,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 00:51:50,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:51:50,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:51:50,301 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9633 [2020-07-21 00:51:50,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:50,310 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:51:50,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:51:50,310 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:51:50,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9829 [2020-07-21 00:51:50,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:50,890 INFO L422 BasicCegarLoop]: trace histogram [1455, 1455, 1091, 727, 727, 727, 727, 727, 727, 727, 364, 364, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:51,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:51,091 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:51,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:51,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1659252020, now seen corresponding path program 11 times [2020-07-21 00:51:51,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:51,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743876665] [2020-07-21 00:51:51,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:52,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:52,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:52,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 5457 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:51:52,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:25,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5881339 backedges. 9613 proven. 87084 refuted. 0 times theorem prover too weak. 5784642 trivial. 0 not checked. [2020-07-21 00:52:25,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:33,713 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:52:38,439 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:52:38,564 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:52:38,686 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 00:52:38,797 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 00:52:38,911 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 00:52:39,030 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 00:52:39,143 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 00:52:39,251 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 00:52:39,357 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 00:52:39,560 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 00:53:32,290 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:53:42,306 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:53:42,418 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:53:42,523 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:53:43,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:53:43,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:04,921 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 00:54:05,129 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:54:05,243 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:54:07,525 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:54:07,652 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:54:07,765 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 00:54:07,873 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 00:54:07,979 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 00:54:08,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:25,518 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:54:25,640 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:54:25,750 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 00:54:25,854 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:54:26,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:26,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:35,506 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 00:54:35,757 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 00:54:35,881 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:54:36,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:36,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:41,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:41,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:46,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:46,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:48,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:54:50,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:55:28,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5881339 backedges. 9613 proven. 87271 refuted. 0 times theorem prover too weak. 5784455 trivial. 0 not checked. [2020-07-21 00:55:28,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743876665] [2020-07-21 00:55:28,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:55:28,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:55:28,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482888827] [2020-07-21 00:55:28,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:55:28,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:55:28,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:55:28,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:55:28,310 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 00:55:29,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:55:29,992 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 00:55:29,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:55:29,994 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9828 [2020-07-21 00:55:30,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:55:30,007 INFO L225 Difference]: With dead ends: 137 [2020-07-21 00:55:30,008 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 00:55:30,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19667 GetRequests, 19604 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:55:30,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 00:55:30,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 00:55:30,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:55:30,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:55:30,038 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9828 [2020-07-21 00:55:30,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:55:30,043 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:55:30,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:55:30,043 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:55:33,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21256 [2020-07-21 00:55:33,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:55:33,463 INFO L422 BasicCegarLoop]: trace histogram [3269, 3269, 1635, 1634, 1634, 1634, 1634, 1634, 1634, 1634, 1634, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:55:33,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:55:33,669 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:55:33,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:55:33,675 INFO L82 PathProgramCache]: Analyzing trace with hash -765912721, now seen corresponding path program 12 times [2020-07-21 00:55:33,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:55:33,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269324003] [2020-07-21 00:55:33,676 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:55:37,308 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:55:37,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:55:37,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 11852 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 00:55:37,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:58:32,789 INFO L134 CoverageAnalysis]: Checked inductivity of 28036989 backedges. 20894 proven. 203764 refuted. 0 times theorem prover too weak. 27812331 trivial. 0 not checked. [2020-07-21 00:58:32,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:58:35,039 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 00:58:36,186 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 00:58:36,291 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 00:58:36,403 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 00:58:36,515 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 00:58:37,551 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 00:58:37,665 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 00:58:37,789 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:58:37,922 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 00:58:45,898 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:58:46,055 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:58:46,219 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:58:46,384 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 59