/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:49:55,420 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:49:55,423 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:49:55,436 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:49:55,437 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:49:55,438 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:49:55,439 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:49:55,441 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:49:55,443 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:49:55,444 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:49:55,446 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:49:55,447 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:49:55,447 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:49:55,448 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:49:55,450 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:49:55,451 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:49:55,452 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:49:55,453 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:49:55,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:49:55,457 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:49:55,459 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:49:55,460 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:49:55,461 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:49:55,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:49:55,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:49:55,474 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:49:55,475 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:49:55,476 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:49:55,477 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 15:49:55,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:49:55,495 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:49:55,501 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:49:55,504 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:49:55,505 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:49:55,505 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:49:55,505 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:49:55,505 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:49:55,506 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:49:55,507 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:49:55,507 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:49:55,507 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:49:55,507 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:49:55,507 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:49:55,508 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:49:55,508 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:49:55,508 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:49:55,508 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:49:55,509 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:49:55,509 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:49:55,509 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:49:55,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:55,513 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:49:55,513 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:49:55,513 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:49:55,861 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:49:55,885 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:49:55,889 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:49:55,891 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:49:55,893 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:49:55,895 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-21 15:49:55,986 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9564ef351/d5b2152d40984ba3a48357df6acd6317/FLAG588e9758f [2020-07-21 15:49:56,485 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:49:56,486 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-21 15:49:56,495 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9564ef351/d5b2152d40984ba3a48357df6acd6317/FLAG588e9758f [2020-07-21 15:49:56,840 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9564ef351/d5b2152d40984ba3a48357df6acd6317 [2020-07-21 15:49:56,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:49:56,858 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:49:56,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:49:56,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:49:56,867 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:49:56,869 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:49:56" (1/1) ... [2020-07-21 15:49:56,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656f572e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:56, skipping insertion in model container [2020-07-21 15:49:56,874 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:49:56" (1/1) ... [2020-07-21 15:49:56,883 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:49:56,904 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:49:57,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:49:57,108 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:49:57,129 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:49:57,147 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:49:57,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57 WrapperNode [2020-07-21 15:49:57,148 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:49:57,149 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:49:57,149 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:49:57,150 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:49:57,166 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,167 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,256 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,268 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,272 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,274 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... [2020-07-21 15:49:57,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:49:57,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:49:57,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:49:57,277 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:49:57,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:49:57,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:49:57,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:49:57,357 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 15:49:57,357 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 15:49:57,358 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:49:57,358 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:49:57,358 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:49:57,358 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 15:49:57,358 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 15:49:57,358 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:49:57,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:49:57,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:49:57,568 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:49:57,568 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:49:57,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:49:57 BoogieIcfgContainer [2020-07-21 15:49:57,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:49:57,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:49:57,575 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:49:57,579 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:49:57,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:49:56" (1/3) ... [2020-07-21 15:49:57,580 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:49:57, skipping insertion in model container [2020-07-21 15:49:57,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:49:57" (2/3) ... [2020-07-21 15:49:57,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:49:57, skipping insertion in model container [2020-07-21 15:49:57,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:49:57" (3/3) ... [2020-07-21 15:49:57,583 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-2.c [2020-07-21 15:49:57,596 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:49:57,609 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:49:57,627 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:49:57,661 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:49:57,662 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:49:57,662 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:49:57,662 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:49:57,662 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:49:57,662 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:49:57,663 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:49:57,663 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:49:57,707 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 15:49:57,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:49:57,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:49:57,732 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:49:57,733 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:49:57,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:49:57,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 15:49:57,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:49:57,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476427454] [2020-07-21 15:49:57,761 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:57,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:49:57,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:49:57,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:49:57,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:57,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:49:57,929 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:49:57,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476427454] [2020-07-21 15:49:57,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:49:57,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:49:57,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460849314] [2020-07-21 15:49:57,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:49:57,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:57,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:49:57,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:49:57,953 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 15:49:58,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:49:58,072 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 15:49:58,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:49:58,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:49:58,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:49:58,087 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:49:58,087 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:49:58,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:49:58,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:49:58,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 15:49:58,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:49:58,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:49:58,144 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 15:49:58,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:49:58,145 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:49:58,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:49:58,145 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:49:58,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:49:58,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:49:58,148 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:49:58,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:58,362 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:49:58,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:49:58,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 15:49:58,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:49:58,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935496948] [2020-07-21 15:49:58,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:58,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:49:58,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:49:58,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:49:58,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:58,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:49:58,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:49:58,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935496948] [2020-07-21 15:49:58,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:49:58,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:49:58,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908173494] [2020-07-21 15:49:58,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:49:58,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:58,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:49:58,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:49:58,439 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 15:49:58,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:49:58,515 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 15:49:58,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:49:58,516 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:49:58,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:49:58,519 INFO L225 Difference]: With dead ends: 36 [2020-07-21 15:49:58,519 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 15:49:58,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:49:58,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 15:49:58,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 15:49:58,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:49:58,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:49:58,533 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 15:49:58,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:49:58,533 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:49:58,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:49:58,534 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:49:58,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:49:58,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:49:58,539 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:49:58,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:58,754 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:49:58,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:49:58,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 15:49:58,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:49:58,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277457554] [2020-07-21 15:49:58,757 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:58,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:49:58,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:49:58,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:49:58,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:58,900 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:49:58,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:49:59,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:59,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:59,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:49:59,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277457554] [2020-07-21 15:49:59,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:49:59,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:49:59,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838847389] [2020-07-21 15:49:59,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:49:59,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:59,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:49:59,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:49:59,222 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 15:49:59,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:49:59,341 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 15:49:59,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:49:59,342 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:49:59,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:49:59,344 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:49:59,344 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:49:59,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:49:59,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:49:59,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 15:49:59,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:49:59,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:49:59,355 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 15:49:59,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:49:59,356 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:49:59,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:49:59,356 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:49:59,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:49:59,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:49:59,358 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:49:59,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:59,572 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:49:59,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:49:59,572 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 15:49:59,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:49:59,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698749608] [2020-07-21 15:49:59,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:49:59,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:49:59,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:49:59,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:49:59,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:59,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:49:59,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:49:59,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:59,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:49:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:49:59,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698749608] [2020-07-21 15:49:59,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:49:59,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:49:59,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43392457] [2020-07-21 15:49:59,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:49:59,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:59,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:49:59,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:49:59,899 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 15:50:00,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:00,070 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 15:50:00,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:50:00,071 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 15:50:00,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:00,074 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:50:00,076 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:50:00,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:00,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:50:00,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 15:50:00,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:50:00,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:50:00,089 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 15:50:00,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:00,089 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:50:00,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:50:00,090 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:50:00,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:50:00,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:00,092 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:00,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:00,301 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:00,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:00,302 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 15:50:00,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:00,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952674719] [2020-07-21 15:50:00,303 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:00,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:00,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:00,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:00,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:00,418 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:50:00,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:00,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:00,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:00,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:00,796 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:50:00,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952674719] [2020-07-21 15:50:00,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:00,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:50:00,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818360368] [2020-07-21 15:50:00,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:00,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:00,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:00,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:00,800 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 15:50:00,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:00,964 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 15:50:00,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:00,965 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 15:50:00,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:00,967 INFO L225 Difference]: With dead ends: 51 [2020-07-21 15:50:00,967 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 15:50:00,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:50:00,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 15:50:00,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 15:50:00,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 15:50:00,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 15:50:00,979 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 15:50:00,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:00,980 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 15:50:00,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:00,980 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 15:50:00,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 15:50:00,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:00,983 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:01,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:01,199 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:01,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:01,200 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 15:50:01,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:01,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239687614] [2020-07-21 15:50:01,202 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:01,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:01,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:01,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:01,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:01,309 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:50:01,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:01,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:01,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:01,640 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:50:01,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239687614] [2020-07-21 15:50:01,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:01,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:50:01,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043948029] [2020-07-21 15:50:01,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:01,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:01,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:01,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:01,642 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 15:50:02,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:02,009 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 15:50:02,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:02,011 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 15:50:02,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:02,013 INFO L225 Difference]: With dead ends: 84 [2020-07-21 15:50:02,013 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 15:50:02,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:50:02,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 15:50:02,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 15:50:02,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 15:50:02,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 15:50:02,027 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 15:50:02,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:02,028 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 15:50:02,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:02,028 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 15:50:02,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:50:02,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:02,032 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:02,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:02,246 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:02,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:02,247 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 15:50:02,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:02,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207004517] [2020-07-21 15:50:02,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:02,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:02,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:02,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:02,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:02,371 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 15:50:02,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:02,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:02,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:02,717 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:50:02,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207004517] [2020-07-21 15:50:02,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:02,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:50:02,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067851300] [2020-07-21 15:50:02,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:02,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:02,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:02,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:02,720 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 15:50:02,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:02,891 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 15:50:02,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:02,892 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 15:50:02,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:02,894 INFO L225 Difference]: With dead ends: 63 [2020-07-21 15:50:02,894 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 15:50:02,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:50:02,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 15:50:02,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 15:50:02,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 15:50:02,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 15:50:02,908 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 15:50:02,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:02,908 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 15:50:02,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:02,909 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 15:50:02,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 15:50:02,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:02,912 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:03,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:03,126 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:03,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:03,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 15:50:03,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:03,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40003180] [2020-07-21 15:50:03,128 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:03,173 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:03,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:03,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:50:03,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:03,232 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:50:03,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:03,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:03,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:03,497 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:50:03,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40003180] [2020-07-21 15:50:03,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:03,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:50:03,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178649230] [2020-07-21 15:50:03,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:50:03,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:03,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:50:03,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:50:03,507 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 15:50:03,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:03,638 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 15:50:03,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:50:03,639 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 15:50:03,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:03,641 INFO L225 Difference]: With dead ends: 65 [2020-07-21 15:50:03,641 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 15:50:03,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:03,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 15:50:03,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 15:50:03,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 15:50:03,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 15:50:03,655 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 15:50:03,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:03,655 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 15:50:03,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:50:03,656 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 15:50:03,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 15:50:03,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:03,659 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:03,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:03,870 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:03,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:03,871 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 15:50:03,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:03,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711253655] [2020-07-21 15:50:03,873 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:03,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:03,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:03,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:50:03,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:04,002 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 15:50:04,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:04,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:04,597 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 15:50:04,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711253655] [2020-07-21 15:50:04,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:04,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:50:04,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981772731] [2020-07-21 15:50:04,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:50:04,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:04,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:50:04,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:50:04,608 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 15:50:04,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:04,798 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 15:50:04,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:50:04,799 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 15:50:04,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:04,801 INFO L225 Difference]: With dead ends: 75 [2020-07-21 15:50:04,802 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 15:50:04,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:04,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 15:50:04,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 15:50:04,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 15:50:04,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 15:50:04,818 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 15:50:04,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:04,818 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 15:50:04,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:50:04,818 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 15:50:04,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 15:50:04,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:04,821 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:05,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:05,037 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:05,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:05,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 15:50:05,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:05,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598137161] [2020-07-21 15:50:05,039 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:05,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:05,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:05,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:05,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:05,143 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 15:50:05,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:05,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:05,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:05,528 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:50:05,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598137161] [2020-07-21 15:50:05,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:05,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:50:05,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224701414] [2020-07-21 15:50:05,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:05,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:05,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:05,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:05,532 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 15:50:05,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:05,765 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 15:50:05,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:05,765 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 15:50:05,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:05,767 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:50:05,767 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:50:05,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:50:05,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:50:05,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 15:50:05,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:50:05,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 15:50:05,793 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 15:50:05,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:05,794 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 15:50:05,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:05,797 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 15:50:05,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:50:05,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:05,802 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:06,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:06,006 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:06,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:06,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 15:50:06,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:06,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262856458] [2020-07-21 15:50:06,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:06,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:06,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:06,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:06,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:06,162 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:50:06,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:06,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:06,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:06,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:06,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:06,880 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 15:50:06,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262856458] [2020-07-21 15:50:06,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:06,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:50:06,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069477930] [2020-07-21 15:50:06,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:50:06,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:06,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:50:06,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:50:06,883 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 15:50:07,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:07,349 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 15:50:07,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:50:07,349 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 15:50:07,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:07,351 INFO L225 Difference]: With dead ends: 131 [2020-07-21 15:50:07,351 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 15:50:07,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:50:07,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 15:50:07,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 15:50:07,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 15:50:07,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 15:50:07,369 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 15:50:07,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:07,370 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 15:50:07,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:50:07,374 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 15:50:07,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 15:50:07,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:07,379 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:07,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:07,594 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:07,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:07,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 15:50:07,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:07,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374508534] [2020-07-21 15:50:07,595 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:07,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:07,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:07,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:07,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:07,758 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 15:50:07,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:08,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:08,628 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 15:50:08,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374508534] [2020-07-21 15:50:08,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:08,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:50:08,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215295262] [2020-07-21 15:50:08,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:50:08,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:08,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:50:08,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:08,631 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 15:50:09,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:09,506 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 15:50:09,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:50:09,506 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 15:50:09,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:09,513 INFO L225 Difference]: With dead ends: 186 [2020-07-21 15:50:09,513 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 15:50:09,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 15:50:09,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 15:50:09,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 15:50:09,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 15:50:09,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 15:50:09,558 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 15:50:09,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:09,558 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 15:50:09,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:50:09,558 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 15:50:09,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:50:09,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:09,561 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:09,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:09,772 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:09,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:09,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 15:50:09,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:09,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437846963] [2020-07-21 15:50:09,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:09,835 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:09,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:09,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:50:09,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:09,893 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 15:50:09,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:10,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:10,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:10,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:10,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:10,423 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:50:10,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437846963] [2020-07-21 15:50:10,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:10,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:50:10,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916100010] [2020-07-21 15:50:10,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:50:10,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:10,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:50:10,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:50:10,425 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 15:50:10,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:10,607 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 15:50:10,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:50:10,608 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 15:50:10,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:10,610 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:50:10,610 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 15:50:10,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:10,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 15:50:10,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 15:50:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 15:50:10,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 15:50:10,630 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 15:50:10,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:10,630 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 15:50:10,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:50:10,630 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 15:50:10,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 15:50:10,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:10,632 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:10,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:10,841 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:10,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:10,842 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 15:50:10,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:10,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791323259] [2020-07-21 15:50:10,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:10,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:10,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:10,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:10,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:11,001 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 15:50:11,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:11,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:11,736 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 15:50:11,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791323259] [2020-07-21 15:50:11,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:11,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 15:50:11,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121699104] [2020-07-21 15:50:11,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:50:11,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:11,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:50:11,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:50:11,738 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 15:50:12,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:12,295 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 15:50:12,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:50:12,296 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 15:50:12,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:12,302 INFO L225 Difference]: With dead ends: 269 [2020-07-21 15:50:12,302 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 15:50:12,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:50:12,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 15:50:12,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 15:50:12,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 15:50:12,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 15:50:12,335 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 15:50:12,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:12,338 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 15:50:12,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:50:12,338 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 15:50:12,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 15:50:12,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:12,343 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:12,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:12,557 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:12,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:12,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 15:50:12,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:12,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218853278] [2020-07-21 15:50:12,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:12,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:12,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:12,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:12,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:12,690 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 15:50:12,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:12,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:12,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:12,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:13,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:13,052 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 15:50:13,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218853278] [2020-07-21 15:50:13,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:13,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:50:13,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996511305] [2020-07-21 15:50:13,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:13,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:13,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:13,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:13,054 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 15:50:13,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:13,219 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 15:50:13,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:13,221 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 15:50:13,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:13,224 INFO L225 Difference]: With dead ends: 167 [2020-07-21 15:50:13,224 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 15:50:13,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:50:13,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 15:50:13,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 15:50:13,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 15:50:13,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 15:50:13,251 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 15:50:13,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:13,251 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 15:50:13,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:13,252 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 15:50:13,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:50:13,256 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:13,256 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:13,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:13,469 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:13,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:13,469 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 15:50:13,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:13,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270798711] [2020-07-21 15:50:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:13,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:13,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:13,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:13,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:13,629 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 15:50:13,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:14,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:14,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:14,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:14,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:14,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:14,856 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 15:50:14,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270798711] [2020-07-21 15:50:14,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:14,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:50:14,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595282716] [2020-07-21 15:50:14,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:50:14,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:14,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:50:14,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:14,866 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 15:50:15,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:15,441 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 15:50:15,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:50:15,442 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 15:50:15,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:15,445 INFO L225 Difference]: With dead ends: 369 [2020-07-21 15:50:15,446 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 15:50:15,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:50:15,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 15:50:15,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 15:50:15,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 15:50:15,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 15:50:15,470 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 15:50:15,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:15,470 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 15:50:15,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:50:15,471 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 15:50:15,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 15:50:15,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:15,474 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:15,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:15,689 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:15,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:15,690 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 15:50:15,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:15,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311544440] [2020-07-21 15:50:15,690 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:15,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:15,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:15,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:50:15,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:15,825 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 15:50:15,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:16,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:16,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:16,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:16,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:16,224 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 15:50:16,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311544440] [2020-07-21 15:50:16,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:16,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:50:16,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568718925] [2020-07-21 15:50:16,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:50:16,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:16,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:50:16,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:50:16,226 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 15:50:16,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:16,393 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 15:50:16,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:50:16,395 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 15:50:16,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:16,399 INFO L225 Difference]: With dead ends: 191 [2020-07-21 15:50:16,399 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 15:50:16,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:50:16,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 15:50:16,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 15:50:16,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 15:50:16,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 15:50:16,417 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 15:50:16,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:16,418 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 15:50:16,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:50:16,418 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 15:50:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 15:50:16,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:16,421 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:16,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:16,635 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:16,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:16,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 15:50:16,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:16,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493225141] [2020-07-21 15:50:16,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:16,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:16,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:16,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:16,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:16,810 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 15:50:16,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:17,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:17,755 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 15:50:17,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493225141] [2020-07-21 15:50:17,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:17,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:50:17,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965037313] [2020-07-21 15:50:17,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:50:17,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:17,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:50:17,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:50:17,757 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 15:50:17,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:17,981 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 15:50:17,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:50:17,982 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 15:50:17,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:17,985 INFO L225 Difference]: With dead ends: 206 [2020-07-21 15:50:17,985 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 15:50:17,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:17,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 15:50:18,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 15:50:18,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 15:50:18,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 15:50:18,004 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 15:50:18,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:18,004 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 15:50:18,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:50:18,004 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 15:50:18,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:50:18,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:18,008 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:18,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:18,221 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:18,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:18,222 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 15:50:18,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:18,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268413729] [2020-07-21 15:50:18,223 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:18,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:18,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:18,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:18,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:18,385 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 15:50:18,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:18,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:18,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:19,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:19,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:19,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:19,311 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 15:50:19,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268413729] [2020-07-21 15:50:19,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:19,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:50:19,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800202374] [2020-07-21 15:50:19,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:50:19,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:19,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:50:19,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:50:19,314 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 15:50:19,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:19,733 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 15:50:19,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:50:19,734 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 15:50:19,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:19,737 INFO L225 Difference]: With dead ends: 376 [2020-07-21 15:50:19,738 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 15:50:19,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:50:19,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 15:50:19,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 15:50:19,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 15:50:19,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 15:50:19,759 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-21 15:50:19,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:19,759 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 15:50:19,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:50:19,759 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 15:50:19,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 15:50:19,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:19,764 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:19,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:19,981 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:19,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:19,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-21 15:50:19,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:19,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941052] [2020-07-21 15:50:19,982 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:20,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:20,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:20,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:50:20,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:20,297 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 15:50:20,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:21,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:21,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:21,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:21,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:21,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:22,234 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-21 15:50:22,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941052] [2020-07-21 15:50:22,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:22,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 15:50:22,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269223080] [2020-07-21 15:50:22,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:50:22,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:22,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:50:22,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:50:22,237 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-21 15:50:23,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:23,315 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-21 15:50:23,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:50:23,316 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-21 15:50:23,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:23,320 INFO L225 Difference]: With dead ends: 479 [2020-07-21 15:50:23,322 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 15:50:23,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 15:50:23,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 15:50:23,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-21 15:50:23,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 15:50:23,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-21 15:50:23,354 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-21 15:50:23,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:23,354 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-21 15:50:23,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:50:23,355 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-21 15:50:23,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 15:50:23,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:23,359 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:23,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:23,572 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:23,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:23,573 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 7 times [2020-07-21 15:50:23,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:23,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225304895] [2020-07-21 15:50:23,575 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:23,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:23,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:23,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:50:23,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:23,804 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 15:50:23,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:24,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:24,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:24,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:25,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:25,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:25,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:25,400 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-21 15:50:25,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225304895] [2020-07-21 15:50:25,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:25,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:50:25,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842796361] [2020-07-21 15:50:25,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:50:25,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:25,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:50:25,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:50:25,403 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 23 states. [2020-07-21 15:50:26,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:26,305 INFO L93 Difference]: Finished difference Result 491 states and 962 transitions. [2020-07-21 15:50:26,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 15:50:26,306 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-21 15:50:26,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:26,310 INFO L225 Difference]: With dead ends: 491 [2020-07-21 15:50:26,311 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 15:50:26,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 15:50:26,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 15:50:26,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 238. [2020-07-21 15:50:26,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 15:50:26,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 446 transitions. [2020-07-21 15:50:26,337 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 446 transitions. Word has length 136 [2020-07-21 15:50:26,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:26,337 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 446 transitions. [2020-07-21 15:50:26,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:50:26,337 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 446 transitions. [2020-07-21 15:50:26,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 15:50:26,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:26,341 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:26,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:26,557 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:26,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:26,558 INFO L82 PathProgramCache]: Analyzing trace with hash -400360989, now seen corresponding path program 8 times [2020-07-21 15:50:26,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:26,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510745452] [2020-07-21 15:50:26,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:26,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:26,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:26,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:50:26,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:26,790 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2020-07-21 15:50:26,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:27,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:27,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:27,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:27,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:27,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:27,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:28,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:28,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:28,060 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 131 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-21 15:50:28,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510745452] [2020-07-21 15:50:28,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:28,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 15:50:28,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477972058] [2020-07-21 15:50:28,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:50:28,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:28,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:50:28,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:28,063 INFO L87 Difference]: Start difference. First operand 238 states and 446 transitions. Second operand 21 states. [2020-07-21 15:50:28,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:28,816 INFO L93 Difference]: Finished difference Result 487 states and 959 transitions. [2020-07-21 15:50:28,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 15:50:28,819 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 122 [2020-07-21 15:50:28,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:28,823 INFO L225 Difference]: With dead ends: 487 [2020-07-21 15:50:28,823 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 15:50:28,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 15:50:28,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 15:50:28,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 232. [2020-07-21 15:50:28,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 15:50:28,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 429 transitions. [2020-07-21 15:50:28,847 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 429 transitions. Word has length 122 [2020-07-21 15:50:28,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:28,847 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 429 transitions. [2020-07-21 15:50:28,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:50:28,848 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 429 transitions. [2020-07-21 15:50:28,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 15:50:28,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:28,851 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:29,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:29,066 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:29,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:29,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 9 times [2020-07-21 15:50:29,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:29,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144318158] [2020-07-21 15:50:29,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:29,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:29,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:29,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:29,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:29,297 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 15:50:29,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:29,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:29,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:30,266 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 15:50:30,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144318158] [2020-07-21 15:50:30,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:30,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:50:30,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265414601] [2020-07-21 15:50:30,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:50:30,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:30,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:50:30,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:50:30,268 INFO L87 Difference]: Start difference. First operand 232 states and 429 transitions. Second operand 16 states. [2020-07-21 15:50:30,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:30,528 INFO L93 Difference]: Finished difference Result 239 states and 439 transitions. [2020-07-21 15:50:30,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:50:30,529 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 15:50:30,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:30,534 INFO L225 Difference]: With dead ends: 239 [2020-07-21 15:50:30,534 INFO L226 Difference]: Without dead ends: 235 [2020-07-21 15:50:30,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:30,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2020-07-21 15:50:30,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 227. [2020-07-21 15:50:30,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2020-07-21 15:50:30,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 414 transitions. [2020-07-21 15:50:30,557 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 414 transitions. Word has length 109 [2020-07-21 15:50:30,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:30,557 INFO L479 AbstractCegarLoop]: Abstraction has 227 states and 414 transitions. [2020-07-21 15:50:30,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:50:30,558 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 414 transitions. [2020-07-21 15:50:30,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 15:50:30,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:30,562 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:30,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:30,776 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:30,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:30,777 INFO L82 PathProgramCache]: Analyzing trace with hash -375419840, now seen corresponding path program 2 times [2020-07-21 15:50:30,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:30,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092346947] [2020-07-21 15:50:30,777 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:30,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:30,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:30,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:30,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:31,116 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 120 proven. 110 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 15:50:31,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:31,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:31,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:31,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:32,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:32,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:32,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:32,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:32,297 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 120 proven. 113 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 15:50:32,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092346947] [2020-07-21 15:50:32,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:32,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 15:50:32,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361452126] [2020-07-21 15:50:32,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:50:32,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:32,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:50:32,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:50:32,300 INFO L87 Difference]: Start difference. First operand 227 states and 414 transitions. Second operand 19 states. [2020-07-21 15:50:32,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:32,760 INFO L93 Difference]: Finished difference Result 472 states and 899 transitions. [2020-07-21 15:50:32,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:50:32,762 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 133 [2020-07-21 15:50:32,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:32,765 INFO L225 Difference]: With dead ends: 472 [2020-07-21 15:50:32,765 INFO L226 Difference]: Without dead ends: 251 [2020-07-21 15:50:32,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 236 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 15:50:32,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-07-21 15:50:32,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 233. [2020-07-21 15:50:32,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 15:50:32,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 411 transitions. [2020-07-21 15:50:32,786 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 411 transitions. Word has length 133 [2020-07-21 15:50:32,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:32,787 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 411 transitions. [2020-07-21 15:50:32,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:50:32,787 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 411 transitions. [2020-07-21 15:50:32,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 15:50:32,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:32,791 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:33,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:33,005 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:33,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:33,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 3 times [2020-07-21 15:50:33,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:33,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536799200] [2020-07-21 15:50:33,006 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:33,160 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:33,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:33,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:50:33,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:33,255 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 105 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-21 15:50:33,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:33,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:33,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:33,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:33,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:33,979 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 110 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-21 15:50:33,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536799200] [2020-07-21 15:50:33,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:33,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:50:33,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178308547] [2020-07-21 15:50:33,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:50:33,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:33,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:50:33,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:50:33,982 INFO L87 Difference]: Start difference. First operand 233 states and 411 transitions. Second operand 14 states. [2020-07-21 15:50:34,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:34,207 INFO L93 Difference]: Finished difference Result 271 states and 491 transitions. [2020-07-21 15:50:34,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:50:34,208 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 15:50:34,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:34,211 INFO L225 Difference]: With dead ends: 271 [2020-07-21 15:50:34,212 INFO L226 Difference]: Without dead ends: 267 [2020-07-21 15:50:34,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:34,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2020-07-21 15:50:34,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 246. [2020-07-21 15:50:34,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 15:50:34,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 15:50:34,240 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 133 [2020-07-21 15:50:34,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:34,241 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 15:50:34,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:50:34,241 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 15:50:34,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 15:50:34,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:34,248 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:34,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:34,463 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:34,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:34,463 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 10 times [2020-07-21 15:50:34,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:34,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541055206] [2020-07-21 15:50:34,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:34,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:34,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:34,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:50:34,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:34,683 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-21 15:50:34,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:35,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:35,480 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-21 15:50:35,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541055206] [2020-07-21 15:50:35,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:35,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:50:35,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152764060] [2020-07-21 15:50:35,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:50:35,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:35,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:50:35,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:50:35,483 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 14 states. [2020-07-21 15:50:35,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:35,751 INFO L93 Difference]: Finished difference Result 276 states and 515 transitions. [2020-07-21 15:50:35,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:50:35,752 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 15:50:35,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:35,756 INFO L225 Difference]: With dead ends: 276 [2020-07-21 15:50:35,757 INFO L226 Difference]: Without dead ends: 272 [2020-07-21 15:50:35,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:35,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-21 15:50:35,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 246. [2020-07-21 15:50:35,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 15:50:35,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 15:50:35,777 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 133 [2020-07-21 15:50:35,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:35,778 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 15:50:35,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:50:35,778 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 15:50:35,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 15:50:35,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:35,782 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:35,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:35,996 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:35,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:35,997 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 4 times [2020-07-21 15:50:35,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:35,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184877446] [2020-07-21 15:50:35,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:36,166 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:36,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:36,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:50:36,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:36,234 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 139 proven. 46 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2020-07-21 15:50:36,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:36,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:36,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:36,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:36,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:36,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:36,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:37,011 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 141 proven. 49 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-07-21 15:50:37,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184877446] [2020-07-21 15:50:37,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:37,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:50:37,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668181783] [2020-07-21 15:50:37,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:50:37,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:37,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:50:37,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:50:37,013 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 14 states. [2020-07-21 15:50:37,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:37,212 INFO L93 Difference]: Finished difference Result 256 states and 454 transitions. [2020-07-21 15:50:37,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:50:37,213 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 157 [2020-07-21 15:50:37,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:37,218 INFO L225 Difference]: With dead ends: 256 [2020-07-21 15:50:37,218 INFO L226 Difference]: Without dead ends: 252 [2020-07-21 15:50:37,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:37,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-21 15:50:37,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2020-07-21 15:50:37,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 15:50:37,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 15:50:37,238 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 157 [2020-07-21 15:50:37,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:37,238 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 15:50:37,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:50:37,238 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 15:50:37,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2020-07-21 15:50:37,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:37,243 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 13, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:37,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:37,458 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:37,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:37,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1667598659, now seen corresponding path program 11 times [2020-07-21 15:50:37,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:37,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163259828] [2020-07-21 15:50:37,459 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:37,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:37,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:37,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:50:37,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:37,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 269 proven. 452 refuted. 0 times theorem prover too weak. 996 trivial. 0 not checked. [2020-07-21 15:50:37,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:38,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:38,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:38,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:38,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:39,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:39,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:39,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:39,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:39,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:40,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:40,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:40,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:40,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:40,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 271 proven. 465 refuted. 0 times theorem prover too weak. 981 trivial. 0 not checked. [2020-07-21 15:50:40,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163259828] [2020-07-21 15:50:40,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:40,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 15:50:40,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269785257] [2020-07-21 15:50:40,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:50:40,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:40,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:50:40,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:50:40,205 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 25 states. [2020-07-21 15:50:41,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:41,308 INFO L93 Difference]: Finished difference Result 617 states and 1204 transitions. [2020-07-21 15:50:41,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 15:50:41,310 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 253 [2020-07-21 15:50:41,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:41,315 INFO L225 Difference]: With dead ends: 617 [2020-07-21 15:50:41,315 INFO L226 Difference]: Without dead ends: 319 [2020-07-21 15:50:41,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 463 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 15:50:41,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2020-07-21 15:50:41,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 268. [2020-07-21 15:50:41,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 15:50:41,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 468 transitions. [2020-07-21 15:50:41,344 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 468 transitions. Word has length 253 [2020-07-21 15:50:41,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:41,345 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 468 transitions. [2020-07-21 15:50:41,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:50:41,345 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 468 transitions. [2020-07-21 15:50:41,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2020-07-21 15:50:41,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:41,349 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:41,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:41,565 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:41,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:41,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1624980115, now seen corresponding path program 5 times [2020-07-21 15:50:41,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:41,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116235376] [2020-07-21 15:50:41,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:41,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:41,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:41,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:50:41,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:42,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 271 proven. 208 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 15:50:42,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:42,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:42,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:42,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 273 proven. 215 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2020-07-21 15:50:43,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116235376] [2020-07-21 15:50:43,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:43,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:50:43,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228165555] [2020-07-21 15:50:43,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:50:43,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:43,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:50:43,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:50:43,992 INFO L87 Difference]: Start difference. First operand 268 states and 468 transitions. Second operand 23 states. [2020-07-21 15:50:44,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:44,869 INFO L93 Difference]: Finished difference Result 614 states and 1124 transitions. [2020-07-21 15:50:44,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 15:50:44,875 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 198 [2020-07-21 15:50:44,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:44,881 INFO L225 Difference]: With dead ends: 614 [2020-07-21 15:50:44,881 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 15:50:44,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 358 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 15:50:44,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 15:50:44,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-21 15:50:44,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 15:50:44,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 495 transitions. [2020-07-21 15:50:44,913 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 495 transitions. Word has length 198 [2020-07-21 15:50:44,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:44,914 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 495 transitions. [2020-07-21 15:50:44,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:50:44,914 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 495 transitions. [2020-07-21 15:50:44,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 15:50:44,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:44,919 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:45,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:45,134 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:45,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:45,135 INFO L82 PathProgramCache]: Analyzing trace with hash 920981290, now seen corresponding path program 6 times [2020-07-21 15:50:45,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:45,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512295074] [2020-07-21 15:50:45,135 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:45,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:45,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:45,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:45,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:45,432 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 206 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2020-07-21 15:50:45,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:46,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:46,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:47,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:47,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:47,072 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 220 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2020-07-21 15:50:47,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512295074] [2020-07-21 15:50:47,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:47,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:50:47,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705465087] [2020-07-21 15:50:47,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:50:47,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:47,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:50:47,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:47,074 INFO L87 Difference]: Start difference. First operand 288 states and 495 transitions. Second operand 18 states. [2020-07-21 15:50:47,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:47,343 INFO L93 Difference]: Finished difference Result 313 states and 534 transitions. [2020-07-21 15:50:47,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:50:47,344 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 157 [2020-07-21 15:50:47,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:47,346 INFO L225 Difference]: With dead ends: 313 [2020-07-21 15:50:47,347 INFO L226 Difference]: Without dead ends: 309 [2020-07-21 15:50:47,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 286 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:50:47,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2020-07-21 15:50:47,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 290. [2020-07-21 15:50:47,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 15:50:47,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 488 transitions. [2020-07-21 15:50:47,368 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 488 transitions. Word has length 157 [2020-07-21 15:50:47,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:47,369 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 488 transitions. [2020-07-21 15:50:47,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:50:47,369 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 488 transitions. [2020-07-21 15:50:47,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 15:50:47,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:47,373 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:47,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:47,587 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:47,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:47,588 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 12 times [2020-07-21 15:50:47,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:47,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069291324] [2020-07-21 15:50:47,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:47,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:47,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:47,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:47,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:47,875 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 260 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-21 15:50:47,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:48,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:48,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:49,587 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 276 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-07-21 15:50:49,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069291324] [2020-07-21 15:50:49,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:49,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:50:49,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722231028] [2020-07-21 15:50:49,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:50:49,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:49,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:50:49,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:50:49,590 INFO L87 Difference]: Start difference. First operand 290 states and 488 transitions. Second operand 18 states. [2020-07-21 15:50:49,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:49,940 INFO L93 Difference]: Finished difference Result 305 states and 507 transitions. [2020-07-21 15:50:49,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:50:49,941 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 177 [2020-07-21 15:50:49,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:49,945 INFO L225 Difference]: With dead ends: 305 [2020-07-21 15:50:49,946 INFO L226 Difference]: Without dead ends: 301 [2020-07-21 15:50:49,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 325 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:50:49,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-21 15:50:49,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 280. [2020-07-21 15:50:49,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 15:50:49,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 470 transitions. [2020-07-21 15:50:49,974 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 470 transitions. Word has length 177 [2020-07-21 15:50:49,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:49,975 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 470 transitions. [2020-07-21 15:50:49,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:50:49,975 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 470 transitions. [2020-07-21 15:50:49,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 15:50:49,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:49,980 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:50,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:50,194 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:50,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:50,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 13 times [2020-07-21 15:50:50,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:50,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554630810] [2020-07-21 15:50:50,196 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:50,420 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:50,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:50,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:50,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:50,510 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 212 refuted. 0 times theorem prover too weak. 627 trivial. 0 not checked. [2020-07-21 15:50:50,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:51,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:51,819 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 222 refuted. 0 times theorem prover too weak. 617 trivial. 0 not checked. [2020-07-21 15:50:51,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554630810] [2020-07-21 15:50:51,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:51,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:50:51,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016292963] [2020-07-21 15:50:51,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:50:51,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:51,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:50:51,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:50:51,822 INFO L87 Difference]: Start difference. First operand 280 states and 470 transitions. Second operand 16 states. [2020-07-21 15:50:52,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:52,136 INFO L93 Difference]: Finished difference Result 320 states and 551 transitions. [2020-07-21 15:50:52,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:50:52,138 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 189 [2020-07-21 15:50:52,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:52,142 INFO L225 Difference]: With dead ends: 320 [2020-07-21 15:50:52,142 INFO L226 Difference]: Without dead ends: 316 [2020-07-21 15:50:52,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 353 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:52,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2020-07-21 15:50:52,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 290. [2020-07-21 15:50:52,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 15:50:52,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 499 transitions. [2020-07-21 15:50:52,169 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 499 transitions. Word has length 189 [2020-07-21 15:50:52,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:52,169 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 499 transitions. [2020-07-21 15:50:52,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:50:52,170 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 499 transitions. [2020-07-21 15:50:52,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 15:50:52,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:52,174 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:52,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:52,389 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:52,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:52,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 14 times [2020-07-21 15:50:52,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:52,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057397195] [2020-07-21 15:50:52,390 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:52,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:50:52,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:52,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:50:52,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:52,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-21 15:50:52,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:53,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:53,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:53,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:53,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:53,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:54,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:54,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-21 15:50:54,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057397195] [2020-07-21 15:50:54,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:54,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:50:54,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137459019] [2020-07-21 15:50:54,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:50:54,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:54,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:50:54,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:50:54,111 INFO L87 Difference]: Start difference. First operand 290 states and 499 transitions. Second operand 16 states. [2020-07-21 15:50:54,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:54,368 INFO L93 Difference]: Finished difference Result 358 states and 697 transitions. [2020-07-21 15:50:54,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:50:54,369 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-21 15:50:54,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:54,374 INFO L225 Difference]: With dead ends: 358 [2020-07-21 15:50:54,375 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 15:50:54,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:50:54,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 15:50:54,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 290. [2020-07-21 15:50:54,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 15:50:54,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 499 transitions. [2020-07-21 15:50:54,403 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 499 transitions. Word has length 201 [2020-07-21 15:50:54,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:54,404 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 499 transitions. [2020-07-21 15:50:54,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:50:54,404 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 499 transitions. [2020-07-21 15:50:54,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-07-21 15:50:54,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:54,409 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:54,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:54,623 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:54,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:54,623 INFO L82 PathProgramCache]: Analyzing trace with hash -435736749, now seen corresponding path program 15 times [2020-07-21 15:50:54,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:54,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006228946] [2020-07-21 15:50:54,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:54,892 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:54,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:54,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:50:54,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:55,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 1099 proven. 86 refuted. 0 times theorem prover too weak. 920 trivial. 0 not checked. [2020-07-21 15:50:55,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:56,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:56,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:56,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:50:57,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 166 proven. 498 refuted. 0 times theorem prover too weak. 1441 trivial. 0 not checked. [2020-07-21 15:50:57,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006228946] [2020-07-21 15:50:57,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:50:57,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 15:50:57,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485029184] [2020-07-21 15:50:57,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:50:57,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:57,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:50:57,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:50:57,291 INFO L87 Difference]: Start difference. First operand 290 states and 499 transitions. Second operand 19 states. [2020-07-21 15:50:57,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:57,857 INFO L93 Difference]: Finished difference Result 605 states and 1073 transitions. [2020-07-21 15:50:57,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:50:57,858 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 277 [2020-07-21 15:50:57,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:57,862 INFO L225 Difference]: With dead ends: 605 [2020-07-21 15:50:57,862 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 15:50:57,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 523 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:50:57,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 15:50:57,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 278. [2020-07-21 15:50:57,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 15:50:57,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 467 transitions. [2020-07-21 15:50:57,887 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 467 transitions. Word has length 277 [2020-07-21 15:50:57,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:57,887 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 467 transitions. [2020-07-21 15:50:57,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:50:57,888 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 467 transitions. [2020-07-21 15:50:57,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-07-21 15:50:57,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:57,892 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 17, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 8, 8, 8, 8, 8, 8, 8, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:58,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:58,106 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:58,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:58,107 INFO L82 PathProgramCache]: Analyzing trace with hash -2125050286, now seen corresponding path program 16 times [2020-07-21 15:50:58,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:58,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998224002] [2020-07-21 15:50:58,108 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:58,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:58,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:58,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:50:58,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:58,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1911 backedges. 1012 proven. 247 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2020-07-21 15:50:58,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:00,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:00,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:00,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:00,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:01,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1911 backedges. 233 proven. 490 refuted. 0 times theorem prover too weak. 1188 trivial. 0 not checked. [2020-07-21 15:51:01,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998224002] [2020-07-21 15:51:01,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:01,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:51:01,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152471839] [2020-07-21 15:51:01,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:51:01,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:01,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:51:01,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:51:01,479 INFO L87 Difference]: Start difference. First operand 278 states and 467 transitions. Second operand 23 states. [2020-07-21 15:51:02,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:02,428 INFO L93 Difference]: Finished difference Result 607 states and 1115 transitions. [2020-07-21 15:51:02,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 15:51:02,429 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 263 [2020-07-21 15:51:02,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:02,434 INFO L225 Difference]: With dead ends: 607 [2020-07-21 15:51:02,434 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 15:51:02,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 488 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 15:51:02,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 15:51:02,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 287. [2020-07-21 15:51:02,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 15:51:02,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 476 transitions. [2020-07-21 15:51:02,458 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 476 transitions. Word has length 263 [2020-07-21 15:51:02,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:02,458 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 476 transitions. [2020-07-21 15:51:02,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:51:02,459 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 476 transitions. [2020-07-21 15:51:02,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-21 15:51:02,462 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:02,462 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:02,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:02,676 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:02,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:02,677 INFO L82 PathProgramCache]: Analyzing trace with hash 124404788, now seen corresponding path program 17 times [2020-07-21 15:51:02,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:02,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975960505] [2020-07-21 15:51:02,678 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:02,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:51:02,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:02,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:51:02,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:03,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 172 proven. 159 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 15:51:03,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:03,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 174 proven. 167 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 15:51:04,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975960505] [2020-07-21 15:51:04,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:04,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:51:04,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097921027] [2020-07-21 15:51:04,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:51:04,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:04,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:51:04,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:51:04,513 INFO L87 Difference]: Start difference. First operand 287 states and 476 transitions. Second operand 16 states. [2020-07-21 15:51:04,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:04,797 INFO L93 Difference]: Finished difference Result 297 states and 490 transitions. [2020-07-21 15:51:04,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:51:04,798 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 213 [2020-07-21 15:51:04,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:04,803 INFO L225 Difference]: With dead ends: 297 [2020-07-21 15:51:04,803 INFO L226 Difference]: Without dead ends: 293 [2020-07-21 15:51:04,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 401 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:51:04,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-07-21 15:51:04,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 282. [2020-07-21 15:51:04,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-07-21 15:51:04,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 468 transitions. [2020-07-21 15:51:04,824 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 468 transitions. Word has length 213 [2020-07-21 15:51:04,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:04,825 INFO L479 AbstractCegarLoop]: Abstraction has 282 states and 468 transitions. [2020-07-21 15:51:04,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:51:04,825 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 468 transitions. [2020-07-21 15:51:04,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 15:51:04,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:04,830 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 29, 29, 21, 19, 18, 18, 18, 18, 18, 18, 18, 15, 14, 14, 14, 14, 14, 14, 14, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:05,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:05,045 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:05,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:05,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1402669273, now seen corresponding path program 18 times [2020-07-21 15:51:05,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:05,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952623117] [2020-07-21 15:51:05,046 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:05,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:05,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:05,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:51:05,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:05,622 INFO L134 CoverageAnalysis]: Checked inductivity of 5501 backedges. 579 proven. 716 refuted. 0 times theorem prover too weak. 4206 trivial. 0 not checked. [2020-07-21 15:51:05,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:07,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:07,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:08,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:08,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:08,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:08,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:08,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5501 backedges. 581 proven. 726 refuted. 0 times theorem prover too weak. 4194 trivial. 0 not checked. [2020-07-21 15:51:08,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952623117] [2020-07-21 15:51:08,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:08,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 15:51:08,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072414475] [2020-07-21 15:51:08,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:51:08,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:08,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:51:08,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:51:08,742 INFO L87 Difference]: Start difference. First operand 282 states and 468 transitions. Second operand 25 states. [2020-07-21 15:51:09,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:09,952 INFO L93 Difference]: Finished difference Result 737 states and 1383 transitions. [2020-07-21 15:51:09,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 15:51:09,953 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 437 [2020-07-21 15:51:09,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:09,959 INFO L225 Difference]: With dead ends: 737 [2020-07-21 15:51:09,960 INFO L226 Difference]: Without dead ends: 459 [2020-07-21 15:51:09,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 892 GetRequests, 835 SyntacticMatches, 15 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=320, Invalid=1572, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 15:51:09,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-21 15:51:09,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 389. [2020-07-21 15:51:09,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2020-07-21 15:51:09,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 734 transitions. [2020-07-21 15:51:09,997 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 734 transitions. Word has length 437 [2020-07-21 15:51:09,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:09,998 INFO L479 AbstractCegarLoop]: Abstraction has 389 states and 734 transitions. [2020-07-21 15:51:09,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:51:09,998 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 734 transitions. [2020-07-21 15:51:10,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 15:51:10,033 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:10,034 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 32, 32, 19, 18, 17, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:10,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:10,235 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:10,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:10,236 INFO L82 PathProgramCache]: Analyzing trace with hash -884746376, now seen corresponding path program 19 times [2020-07-21 15:51:10,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:10,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387197402] [2020-07-21 15:51:10,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:10,555 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:10,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:10,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 15:51:10,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:10,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5695 backedges. 601 proven. 1104 refuted. 0 times theorem prover too weak. 3990 trivial. 0 not checked. [2020-07-21 15:51:10,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:12,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:12,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:13,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:14,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:15,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5695 backedges. 601 proven. 1130 refuted. 0 times theorem prover too weak. 3964 trivial. 0 not checked. [2020-07-21 15:51:15,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387197402] [2020-07-21 15:51:15,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:15,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-21 15:51:15,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702259172] [2020-07-21 15:51:15,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 15:51:15,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:15,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 15:51:15,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-21 15:51:15,757 INFO L87 Difference]: Start difference. First operand 389 states and 734 transitions. Second operand 31 states. [2020-07-21 15:51:17,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:17,837 INFO L93 Difference]: Finished difference Result 885 states and 1969 transitions. [2020-07-21 15:51:17,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 15:51:17,838 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 445 [2020-07-21 15:51:17,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:17,845 INFO L225 Difference]: With dead ends: 885 [2020-07-21 15:51:17,846 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 15:51:17,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 839 SyntacticMatches, 21 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 678 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=525, Invalid=2897, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 15:51:17,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 15:51:17,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 419. [2020-07-21 15:51:17,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2020-07-21 15:51:17,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 837 transitions. [2020-07-21 15:51:17,887 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 837 transitions. Word has length 445 [2020-07-21 15:51:17,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:17,888 INFO L479 AbstractCegarLoop]: Abstraction has 419 states and 837 transitions. [2020-07-21 15:51:17,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 15:51:17,888 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 837 transitions. [2020-07-21 15:51:17,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 15:51:17,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:17,893 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:18,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:18,107 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:18,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:18,108 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 20 times [2020-07-21 15:51:18,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:18,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910814902] [2020-07-21 15:51:18,109 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:18,420 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:51:18,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:18,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:51:18,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:18,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 301 proven. 76 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-21 15:51:18,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:19,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:19,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:19,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:19,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:19,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:19,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:20,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 303 proven. 84 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-21 15:51:20,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910814902] [2020-07-21 15:51:20,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:20,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:51:20,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63672871] [2020-07-21 15:51:20,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:51:20,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:20,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:51:20,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:51:20,214 INFO L87 Difference]: Start difference. First operand 419 states and 837 transitions. Second operand 16 states. [2020-07-21 15:51:20,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:20,504 INFO L93 Difference]: Finished difference Result 432 states and 857 transitions. [2020-07-21 15:51:20,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:51:20,506 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-21 15:51:20,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:20,511 INFO L225 Difference]: With dead ends: 432 [2020-07-21 15:51:20,511 INFO L226 Difference]: Without dead ends: 428 [2020-07-21 15:51:20,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:51:20,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2020-07-21 15:51:20,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 419. [2020-07-21 15:51:20,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2020-07-21 15:51:20,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 837 transitions. [2020-07-21 15:51:20,546 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 837 transitions. Word has length 237 [2020-07-21 15:51:20,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:20,546 INFO L479 AbstractCegarLoop]: Abstraction has 419 states and 837 transitions. [2020-07-21 15:51:20,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:51:20,547 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 837 transitions. [2020-07-21 15:51:20,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 533 [2020-07-21 15:51:20,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:20,554 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 26, 25, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 16, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:20,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:20,768 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:20,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:20,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1878704702, now seen corresponding path program 21 times [2020-07-21 15:51:20,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:20,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424137959] [2020-07-21 15:51:20,770 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:21,139 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:21,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:21,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:51:21,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:21,608 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 4473 proven. 537 refuted. 0 times theorem prover too weak. 3175 trivial. 0 not checked. [2020-07-21 15:51:21,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:25,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:25,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:25,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:25,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:25,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:25,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:26,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:27,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 415 proven. 1650 refuted. 0 times theorem prover too weak. 6120 trivial. 0 not checked. [2020-07-21 15:51:27,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424137959] [2020-07-21 15:51:27,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:27,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 15:51:27,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348797308] [2020-07-21 15:51:27,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:51:27,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:27,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:51:27,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:51:27,046 INFO L87 Difference]: Start difference. First operand 419 states and 837 transitions. Second operand 27 states. [2020-07-21 15:51:28,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:28,837 INFO L93 Difference]: Finished difference Result 893 states and 1874 transitions. [2020-07-21 15:51:28,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 15:51:28,838 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 532 [2020-07-21 15:51:28,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:28,846 INFO L225 Difference]: With dead ends: 893 [2020-07-21 15:51:28,846 INFO L226 Difference]: Without dead ends: 479 [2020-07-21 15:51:28,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1086 GetRequests, 1017 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 15:51:28,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2020-07-21 15:51:28,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 430. [2020-07-21 15:51:28,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 15:51:28,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 871 transitions. [2020-07-21 15:51:28,890 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 871 transitions. Word has length 532 [2020-07-21 15:51:28,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:28,891 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 871 transitions. [2020-07-21 15:51:28,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:51:28,891 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 871 transitions. [2020-07-21 15:51:28,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-07-21 15:51:28,896 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:28,896 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 9, 9, 9, 9, 9, 9, 9, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:29,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:29,110 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:29,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:29,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1296147521, now seen corresponding path program 22 times [2020-07-21 15:51:29,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:29,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921537795] [2020-07-21 15:51:29,112 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:29,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:29,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:29,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:51:29,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:29,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2104 backedges. 844 proven. 32 refuted. 0 times theorem prover too weak. 1228 trivial. 0 not checked. [2020-07-21 15:51:29,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:31,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:31,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:31,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:31,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:31,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:31,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2104 backedges. 144 proven. 490 refuted. 0 times theorem prover too weak. 1470 trivial. 0 not checked. [2020-07-21 15:51:31,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921537795] [2020-07-21 15:51:31,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:31,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:51:31,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110298121] [2020-07-21 15:51:31,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:51:31,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:31,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:51:31,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:51:31,694 INFO L87 Difference]: Start difference. First operand 430 states and 871 transitions. Second operand 17 states. [2020-07-21 15:51:32,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:32,332 INFO L93 Difference]: Finished difference Result 871 states and 1904 transitions. [2020-07-21 15:51:32,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:51:32,333 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 277 [2020-07-21 15:51:32,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:32,341 INFO L225 Difference]: With dead ends: 871 [2020-07-21 15:51:32,341 INFO L226 Difference]: Without dead ends: 446 [2020-07-21 15:51:32,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 527 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:51:32,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2020-07-21 15:51:32,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 430. [2020-07-21 15:51:32,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 15:51:32,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 869 transitions. [2020-07-21 15:51:32,378 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 869 transitions. Word has length 277 [2020-07-21 15:51:32,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:32,378 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 869 transitions. [2020-07-21 15:51:32,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:51:32,378 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 869 transitions. [2020-07-21 15:51:32,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2020-07-21 15:51:32,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:32,385 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 19, 19, 14, 13, 12, 12, 12, 12, 12, 12, 12, 11, 9, 9, 9, 9, 9, 9, 9, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:32,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:32,601 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:32,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:32,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1114542014, now seen corresponding path program 23 times [2020-07-21 15:51:32,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:32,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131454182] [2020-07-21 15:51:32,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:32,944 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:32,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:32,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:51:32,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:33,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 1298 proven. 248 refuted. 0 times theorem prover too weak. 819 trivial. 0 not checked. [2020-07-21 15:51:33,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:35,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:35,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:35,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:35,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:35,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:35,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:36,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:36,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:36,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:36,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:36,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 316 proven. 536 refuted. 0 times theorem prover too weak. 1513 trivial. 0 not checked. [2020-07-21 15:51:36,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131454182] [2020-07-21 15:51:36,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:36,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:51:36,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008885419] [2020-07-21 15:51:36,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:51:36,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:36,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:51:36,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:51:36,443 INFO L87 Difference]: Start difference. First operand 430 states and 869 transitions. Second operand 23 states. [2020-07-21 15:51:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:37,571 INFO L93 Difference]: Finished difference Result 899 states and 1823 transitions. [2020-07-21 15:51:37,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 15:51:37,572 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 292 [2020-07-21 15:51:37,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:37,577 INFO L225 Difference]: With dead ends: 899 [2020-07-21 15:51:37,577 INFO L226 Difference]: Without dead ends: 461 [2020-07-21 15:51:37,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 545 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 15:51:37,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-07-21 15:51:37,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 418. [2020-07-21 15:51:37,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 418 states. [2020-07-21 15:51:37,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 832 transitions. [2020-07-21 15:51:37,619 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 832 transitions. Word has length 292 [2020-07-21 15:51:37,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:37,620 INFO L479 AbstractCegarLoop]: Abstraction has 418 states and 832 transitions. [2020-07-21 15:51:37,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:51:37,620 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 832 transitions. [2020-07-21 15:51:37,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 374 [2020-07-21 15:51:37,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:37,626 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 18, 18, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 12, 7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:37,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:37,842 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:37,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:37,843 INFO L82 PathProgramCache]: Analyzing trace with hash 130659488, now seen corresponding path program 24 times [2020-07-21 15:51:37,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:37,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445348369] [2020-07-21 15:51:37,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:38,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:38,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:38,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:51:38,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:38,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3930 backedges. 2061 proven. 424 refuted. 0 times theorem prover too weak. 1445 trivial. 0 not checked. [2020-07-21 15:51:38,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:41,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:41,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:41,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:41,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:41,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:41,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 3930 backedges. 397 proven. 862 refuted. 0 times theorem prover too weak. 2671 trivial. 0 not checked. [2020-07-21 15:51:42,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445348369] [2020-07-21 15:51:42,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:42,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 15:51:42,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423873176] [2020-07-21 15:51:42,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:51:42,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:42,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:51:42,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:51:42,944 INFO L87 Difference]: Start difference. First operand 418 states and 832 transitions. Second operand 25 states. [2020-07-21 15:51:44,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:44,730 INFO L93 Difference]: Finished difference Result 988 states and 2055 transitions. [2020-07-21 15:51:44,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 15:51:44,731 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 373 [2020-07-21 15:51:44,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:44,738 INFO L225 Difference]: With dead ends: 988 [2020-07-21 15:51:44,738 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 15:51:44,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 765 GetRequests, 703 SyntacticMatches, 19 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=334, Invalid=1646, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 15:51:44,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 15:51:44,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 444. [2020-07-21 15:51:44,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-07-21 15:51:44,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 900 transitions. [2020-07-21 15:51:44,777 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 900 transitions. Word has length 373 [2020-07-21 15:51:44,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:44,778 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 900 transitions. [2020-07-21 15:51:44,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:51:44,778 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 900 transitions. [2020-07-21 15:51:44,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 15:51:44,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:44,784 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:44,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:44,998 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:44,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:44,999 INFO L82 PathProgramCache]: Analyzing trace with hash -432569092, now seen corresponding path program 25 times [2020-07-21 15:51:44,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:45,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826512032] [2020-07-21 15:51:45,000 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:45,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:45,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:45,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:51:45,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:45,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 348 proven. 569 refuted. 0 times theorem prover too weak. 1380 trivial. 0 not checked. [2020-07-21 15:51:45,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:47,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:47,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:47,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:47,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:47,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:48,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:48,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:48,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:48,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:49,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 348 proven. 588 refuted. 0 times theorem prover too weak. 1361 trivial. 0 not checked. [2020-07-21 15:51:49,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826512032] [2020-07-21 15:51:49,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:49,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 15:51:49,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433211038] [2020-07-21 15:51:49,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:51:49,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:49,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:51:49,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:51:49,520 INFO L87 Difference]: Start difference. First operand 444 states and 900 transitions. Second operand 27 states. [2020-07-21 15:51:50,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:50,966 INFO L93 Difference]: Finished difference Result 903 states and 1879 transitions. [2020-07-21 15:51:50,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 15:51:50,967 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 289 [2020-07-21 15:51:50,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:50,976 INFO L225 Difference]: With dead ends: 903 [2020-07-21 15:51:50,976 INFO L226 Difference]: Without dead ends: 449 [2020-07-21 15:51:50,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 531 SyntacticMatches, 21 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=384, Invalid=1968, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 15:51:50,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-21 15:51:51,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 364. [2020-07-21 15:51:51,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 15:51:51,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 671 transitions. [2020-07-21 15:51:51,013 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 671 transitions. Word has length 289 [2020-07-21 15:51:51,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:51,014 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 671 transitions. [2020-07-21 15:51:51,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:51:51,014 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 671 transitions. [2020-07-21 15:51:51,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 15:51:51,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:51,018 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 15, 15, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:51,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:51,233 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:51,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:51,234 INFO L82 PathProgramCache]: Analyzing trace with hash 638865236, now seen corresponding path program 5 times [2020-07-21 15:51:51,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:51,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338428627] [2020-07-21 15:51:51,235 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:51,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:51:51,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:51,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:51:51,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:51,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1534 backedges. 161 proven. 152 refuted. 0 times theorem prover too weak. 1221 trivial. 0 not checked. [2020-07-21 15:51:51,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:52,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:52,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:52,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:52,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:52,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:53,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1534 backedges. 161 proven. 157 refuted. 0 times theorem prover too weak. 1216 trivial. 0 not checked. [2020-07-21 15:51:53,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338428627] [2020-07-21 15:51:53,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:53,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:51:53,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884499316] [2020-07-21 15:51:53,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:51:53,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:53,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:51:53,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:51:53,070 INFO L87 Difference]: Start difference. First operand 364 states and 671 transitions. Second operand 14 states. [2020-07-21 15:51:53,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:53,319 INFO L93 Difference]: Finished difference Result 412 states and 797 transitions. [2020-07-21 15:51:53,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:51:53,321 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 237 [2020-07-21 15:51:53,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:53,328 INFO L225 Difference]: With dead ends: 412 [2020-07-21 15:51:53,329 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 15:51:53,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 454 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:51:53,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 15:51:53,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 364. [2020-07-21 15:51:53,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 15:51:53,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 671 transitions. [2020-07-21 15:51:53,365 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 671 transitions. Word has length 237 [2020-07-21 15:51:53,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:53,366 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 671 transitions. [2020-07-21 15:51:53,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:51:53,366 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 671 transitions. [2020-07-21 15:51:53,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 15:51:53,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:53,370 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:53,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:53,584 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:53,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:53,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1057498309, now seen corresponding path program 6 times [2020-07-21 15:51:53,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:53,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110419110] [2020-07-21 15:51:53,585 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:54,020 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:51:54,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:54,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:51:54,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:54,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 445 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2020-07-21 15:51:54,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:56,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:56,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:56,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:51:57,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 466 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2020-07-21 15:51:57,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110419110] [2020-07-21 15:51:57,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:51:57,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:51:57,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286190156] [2020-07-21 15:51:57,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:51:57,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:57,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:51:57,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:51:57,684 INFO L87 Difference]: Start difference. First operand 364 states and 671 transitions. Second operand 20 states. [2020-07-21 15:51:58,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:58,126 INFO L93 Difference]: Finished difference Result 368 states and 674 transitions. [2020-07-21 15:51:58,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:51:58,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 249 [2020-07-21 15:51:58,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:58,131 INFO L225 Difference]: With dead ends: 368 [2020-07-21 15:51:58,131 INFO L226 Difference]: Without dead ends: 364 [2020-07-21 15:51:58,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 466 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:51:58,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2020-07-21 15:51:58,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 351. [2020-07-21 15:51:58,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-21 15:51:58,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 638 transitions. [2020-07-21 15:51:58,154 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 638 transitions. Word has length 249 [2020-07-21 15:51:58,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:58,155 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 638 transitions. [2020-07-21 15:51:58,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:51:58,155 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 638 transitions. [2020-07-21 15:51:58,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-21 15:51:58,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:58,161 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 21, 20, 19, 19, 19, 19, 19, 19, 19, 18, 16, 16, 16, 16, 16, 16, 16, 12, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:58,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:58,377 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:58,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:58,378 INFO L82 PathProgramCache]: Analyzing trace with hash -207122258, now seen corresponding path program 26 times [2020-07-21 15:51:58,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:58,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129483928] [2020-07-21 15:51:58,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:58,864 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:58,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:58,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 15:51:58,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:59,209 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 687 proven. 1295 refuted. 0 times theorem prover too weak. 4506 trivial. 0 not checked. [2020-07-21 15:51:59,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:01,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:01,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:02,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:04,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:05,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:05,232 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 687 proven. 1327 refuted. 0 times theorem prover too weak. 4474 trivial. 0 not checked. [2020-07-21 15:52:05,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129483928] [2020-07-21 15:52:05,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:05,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 15:52:05,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770770962] [2020-07-21 15:52:05,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 15:52:05,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:05,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 15:52:05,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-21 15:52:05,234 INFO L87 Difference]: Start difference. First operand 351 states and 638 transitions. Second operand 31 states. [2020-07-21 15:52:08,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:08,064 INFO L93 Difference]: Finished difference Result 751 states and 1488 transitions. [2020-07-21 15:52:08,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 15:52:08,066 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 474 [2020-07-21 15:52:08,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:08,072 INFO L225 Difference]: With dead ends: 751 [2020-07-21 15:52:08,072 INFO L226 Difference]: Without dead ends: 405 [2020-07-21 15:52:08,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 894 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 15:52:08,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-21 15:52:08,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 374. [2020-07-21 15:52:08,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2020-07-21 15:52:08,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 712 transitions. [2020-07-21 15:52:08,107 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 712 transitions. Word has length 474 [2020-07-21 15:52:08,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:08,108 INFO L479 AbstractCegarLoop]: Abstraction has 374 states and 712 transitions. [2020-07-21 15:52:08,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 15:52:08,108 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 712 transitions. [2020-07-21 15:52:08,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-21 15:52:08,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:08,114 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 21, 20, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 16, 12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:08,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:08,315 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:08,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:08,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1197228147, now seen corresponding path program 27 times [2020-07-21 15:52:08,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:08,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421596379] [2020-07-21 15:52:08,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:08,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:52:08,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:08,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:52:08,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:09,180 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 712 proven. 951 refuted. 0 times theorem prover too weak. 4461 trivial. 0 not checked. [2020-07-21 15:52:09,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:11,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:11,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:11,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:12,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:12,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:12,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:12,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:13,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:13,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:14,828 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 712 proven. 971 refuted. 0 times theorem prover too weak. 4441 trivial. 0 not checked. [2020-07-21 15:52:14,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421596379] [2020-07-21 15:52:14,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:14,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 15:52:14,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370232566] [2020-07-21 15:52:14,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:52:14,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:14,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:52:14,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:52:14,832 INFO L87 Difference]: Start difference. First operand 374 states and 712 transitions. Second operand 27 states. [2020-07-21 15:52:17,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:17,326 INFO L93 Difference]: Finished difference Result 862 states and 1805 transitions. [2020-07-21 15:52:17,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 15:52:17,329 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 462 [2020-07-21 15:52:17,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:17,335 INFO L225 Difference]: With dead ends: 862 [2020-07-21 15:52:17,336 INFO L226 Difference]: Without dead ends: 477 [2020-07-21 15:52:17,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 877 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=460, Invalid=2296, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 15:52:17,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2020-07-21 15:52:17,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 401. [2020-07-21 15:52:17,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 401 states. [2020-07-21 15:52:17,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 790 transitions. [2020-07-21 15:52:17,371 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 790 transitions. Word has length 462 [2020-07-21 15:52:17,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:17,372 INFO L479 AbstractCegarLoop]: Abstraction has 401 states and 790 transitions. [2020-07-21 15:52:17,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:52:17,372 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 790 transitions. [2020-07-21 15:52:17,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2020-07-21 15:52:17,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:17,378 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 20, 20, 17, 15, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:17,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:17,594 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:17,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:17,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1136693034, now seen corresponding path program 28 times [2020-07-21 15:52:17,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:17,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029232981] [2020-07-21 15:52:17,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:18,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:52:18,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:18,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 15:52:18,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:18,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2413 backedges. 413 proven. 619 refuted. 0 times theorem prover too weak. 1381 trivial. 0 not checked. [2020-07-21 15:52:18,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:21,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:21,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:21,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:21,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:23,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:23,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2413 backedges. 413 proven. 643 refuted. 0 times theorem prover too weak. 1357 trivial. 0 not checked. [2020-07-21 15:52:24,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029232981] [2020-07-21 15:52:24,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:24,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 15:52:24,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869056721] [2020-07-21 15:52:24,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:52:24,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:24,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:52:24,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:52:24,740 INFO L87 Difference]: Start difference. First operand 401 states and 790 transitions. Second operand 29 states. [2020-07-21 15:52:26,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:26,962 INFO L93 Difference]: Finished difference Result 788 states and 1637 transitions. [2020-07-21 15:52:26,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 15:52:26,964 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 297 [2020-07-21 15:52:26,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:26,970 INFO L225 Difference]: With dead ends: 788 [2020-07-21 15:52:26,970 INFO L226 Difference]: Without dead ends: 384 [2020-07-21 15:52:26,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 543 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 15:52:26,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2020-07-21 15:52:26,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 270. [2020-07-21 15:52:26,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 15:52:26,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 429 transitions. [2020-07-21 15:52:26,991 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 429 transitions. Word has length 297 [2020-07-21 15:52:26,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:26,992 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 429 transitions. [2020-07-21 15:52:26,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 15:52:26,992 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 429 transitions. [2020-07-21 15:52:26,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 15:52:26,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:26,994 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 17, 16, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:27,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:27,197 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:27,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:27,198 INFO L82 PathProgramCache]: Analyzing trace with hash -93274365, now seen corresponding path program 29 times [2020-07-21 15:52:27,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:27,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171227625] [2020-07-21 15:52:27,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:27,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:52:27,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:27,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:52:27,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:27,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 99 proven. 619 refuted. 0 times theorem prover too weak. 1914 trivial. 0 not checked. [2020-07-21 15:52:27,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:30,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:30,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:31,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:31,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:31,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:32,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:32,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:32,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:32,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:32,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 99 proven. 643 refuted. 0 times theorem prover too weak. 1890 trivial. 0 not checked. [2020-07-21 15:52:32,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171227625] [2020-07-21 15:52:32,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:32,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:52:32,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625761362] [2020-07-21 15:52:32,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:52:32,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:32,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:52:32,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:52:32,611 INFO L87 Difference]: Start difference. First operand 270 states and 429 transitions. Second operand 20 states. [2020-07-21 15:52:33,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:33,211 INFO L93 Difference]: Finished difference Result 277 states and 439 transitions. [2020-07-21 15:52:33,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:52:33,213 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 310 [2020-07-21 15:52:33,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:33,216 INFO L225 Difference]: With dead ends: 277 [2020-07-21 15:52:33,216 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 15:52:33,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 587 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:52:33,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 15:52:33,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 273. [2020-07-21 15:52:33,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 15:52:33,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 435 transitions. [2020-07-21 15:52:33,232 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 435 transitions. Word has length 310 [2020-07-21 15:52:33,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:33,233 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 435 transitions. [2020-07-21 15:52:33,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:52:33,233 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 435 transitions. [2020-07-21 15:52:33,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 15:52:33,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:33,235 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 17, 16, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:33,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:33,436 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:33,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:33,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1104650920, now seen corresponding path program 30 times [2020-07-21 15:52:33,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:33,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469452813] [2020-07-21 15:52:33,439 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:34,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:52:34,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:34,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:52:34,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:34,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 133 proven. 465 refuted. 0 times theorem prover too weak. 1822 trivial. 0 not checked. [2020-07-21 15:52:34,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:36,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:36,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:36,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 133 proven. 481 refuted. 0 times theorem prover too weak. 1806 trivial. 0 not checked. [2020-07-21 15:52:37,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469452813] [2020-07-21 15:52:37,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:37,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:52:37,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655748491] [2020-07-21 15:52:37,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:52:37,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:37,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:52:37,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:52:37,877 INFO L87 Difference]: Start difference. First operand 273 states and 435 transitions. Second operand 18 states. [2020-07-21 15:52:38,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:38,467 INFO L93 Difference]: Finished difference Result 305 states and 502 transitions. [2020-07-21 15:52:38,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:52:38,470 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 15:52:38,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:38,474 INFO L225 Difference]: With dead ends: 305 [2020-07-21 15:52:38,474 INFO L226 Difference]: Without dead ends: 301 [2020-07-21 15:52:38,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 567 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:52:38,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-21 15:52:38,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 273. [2020-07-21 15:52:38,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 15:52:38,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 435 transitions. [2020-07-21 15:52:38,494 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 435 transitions. Word has length 298 [2020-07-21 15:52:38,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:38,494 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 435 transitions. [2020-07-21 15:52:38,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:52:38,495 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 435 transitions. [2020-07-21 15:52:38,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2020-07-21 15:52:38,498 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:38,498 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 19, 19, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:38,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:38,699 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:38,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:38,700 INFO L82 PathProgramCache]: Analyzing trace with hash -706808307, now seen corresponding path program 31 times [2020-07-21 15:52:38,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:38,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931003091] [2020-07-21 15:52:38,701 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:39,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:52:39,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:39,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:52:39,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:39,621 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 1912 proven. 340 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2020-07-21 15:52:39,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:42,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:42,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:42,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:43,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:43,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:43,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:44,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:44,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:44,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:44,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:44,763 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 428 proven. 688 refuted. 0 times theorem prover too weak. 2566 trivial. 0 not checked. [2020-07-21 15:52:44,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931003091] [2020-07-21 15:52:44,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:44,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:52:44,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856802493] [2020-07-21 15:52:44,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:52:44,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:44,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:52:44,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:52:44,766 INFO L87 Difference]: Start difference. First operand 273 states and 435 transitions. Second operand 23 states. [2020-07-21 15:52:46,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:46,683 INFO L93 Difference]: Finished difference Result 703 states and 1249 transitions. [2020-07-21 15:52:46,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 15:52:46,689 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 363 [2020-07-21 15:52:46,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:46,697 INFO L225 Difference]: With dead ends: 703 [2020-07-21 15:52:46,698 INFO L226 Difference]: Without dead ends: 413 [2020-07-21 15:52:46,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 742 GetRequests, 687 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=277, Invalid=1283, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 15:52:46,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2020-07-21 15:52:46,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 288. [2020-07-21 15:52:46,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 15:52:46,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 471 transitions. [2020-07-21 15:52:46,732 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 471 transitions. Word has length 363 [2020-07-21 15:52:46,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:46,733 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 471 transitions. [2020-07-21 15:52:46,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:52:46,733 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 471 transitions. [2020-07-21 15:52:46,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-21 15:52:46,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:46,739 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 21, 20, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:46,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:46,953 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:46,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:46,954 INFO L82 PathProgramCache]: Analyzing trace with hash 22025187, now seen corresponding path program 32 times [2020-07-21 15:52:46,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:46,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971379044] [2020-07-21 15:52:46,955 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:47,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:52:47,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:47,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:52:47,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:48,301 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 688 proven. 766 refuted. 0 times theorem prover too weak. 3386 trivial. 0 not checked. [2020-07-21 15:52:48,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:52:51,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:51,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:51,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:52,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:52,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:52,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:53,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:54,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:52:55,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 688 proven. 786 refuted. 0 times theorem prover too weak. 3366 trivial. 0 not checked. [2020-07-21 15:52:55,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971379044] [2020-07-21 15:52:55,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:52:55,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 15:52:55,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546279540] [2020-07-21 15:52:55,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:52:55,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:52:55,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:52:55,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:52:55,143 INFO L87 Difference]: Start difference. First operand 288 states and 471 transitions. Second operand 27 states. [2020-07-21 15:52:57,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:57,327 INFO L93 Difference]: Finished difference Result 715 states and 1268 transitions. [2020-07-21 15:52:57,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 15:52:57,328 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 414 [2020-07-21 15:52:57,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:57,333 INFO L225 Difference]: With dead ends: 715 [2020-07-21 15:52:57,333 INFO L226 Difference]: Without dead ends: 411 [2020-07-21 15:52:57,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 781 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=460, Invalid=2296, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 15:52:57,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2020-07-21 15:52:57,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 293. [2020-07-21 15:52:57,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2020-07-21 15:52:57,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 483 transitions. [2020-07-21 15:52:57,358 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 483 transitions. Word has length 414 [2020-07-21 15:52:57,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:57,358 INFO L479 AbstractCegarLoop]: Abstraction has 293 states and 483 transitions. [2020-07-21 15:52:57,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:52:57,359 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 483 transitions. [2020-07-21 15:52:57,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 15:52:57,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:57,362 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 22, 22, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:57,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:57,563 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:57,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:57,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1577007480, now seen corresponding path program 33 times [2020-07-21 15:52:57,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:57,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013082029] [2020-07-21 15:52:57,565 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:58,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:52:58,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:58,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:52:58,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:58,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 180 proven. 470 refuted. 0 times theorem prover too weak. 2214 trivial. 0 not checked. [2020-07-21 15:52:58,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:00,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:00,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:00,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:00,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:00,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:01,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:01,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:01,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:01,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:01,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 180 proven. 486 refuted. 0 times theorem prover too weak. 2198 trivial. 0 not checked. [2020-07-21 15:53:01,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013082029] [2020-07-21 15:53:01,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:01,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:53:01,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394415247] [2020-07-21 15:53:01,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:53:01,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:01,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:53:01,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:53:01,353 INFO L87 Difference]: Start difference. First operand 293 states and 483 transitions. Second operand 18 states. [2020-07-21 15:53:01,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:01,677 INFO L93 Difference]: Finished difference Result 335 states and 575 transitions. [2020-07-21 15:53:01,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:53:01,678 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 322 [2020-07-21 15:53:01,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:01,682 INFO L225 Difference]: With dead ends: 335 [2020-07-21 15:53:01,682 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 15:53:01,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 615 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:53:01,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 15:53:01,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 278. [2020-07-21 15:53:01,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 15:53:01,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 448 transitions. [2020-07-21 15:53:01,697 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 448 transitions. Word has length 322 [2020-07-21 15:53:01,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:01,697 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 448 transitions. [2020-07-21 15:53:01,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:53:01,697 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 448 transitions. [2020-07-21 15:53:01,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2020-07-21 15:53:01,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:01,701 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 19, 19, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 9, 8, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:01,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:01,904 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:01,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:01,905 INFO L82 PathProgramCache]: Analyzing trace with hash 559783750, now seen corresponding path program 34 times [2020-07-21 15:53:01,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:01,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924479033] [2020-07-21 15:53:01,906 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:02,483 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:53:02,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:02,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:53:02,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:02,714 INFO L134 CoverageAnalysis]: Checked inductivity of 3934 backedges. 2215 proven. 290 refuted. 0 times theorem prover too weak. 1429 trivial. 0 not checked. [2020-07-21 15:53:02,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:05,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:05,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:06,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:07,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:07,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3934 backedges. 535 proven. 735 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 15:53:07,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924479033] [2020-07-21 15:53:07,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:07,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 15:53:07,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858891475] [2020-07-21 15:53:07,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:53:07,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:07,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:53:07,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:53:07,349 INFO L87 Difference]: Start difference. First operand 278 states and 448 transitions. Second operand 25 states. [2020-07-21 15:53:08,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:08,902 INFO L93 Difference]: Finished difference Result 672 states and 1132 transitions. [2020-07-21 15:53:08,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 15:53:08,903 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 375 [2020-07-21 15:53:08,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:08,908 INFO L225 Difference]: With dead ends: 672 [2020-07-21 15:53:08,908 INFO L226 Difference]: Without dead ends: 357 [2020-07-21 15:53:08,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 707 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 15:53:08,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2020-07-21 15:53:08,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 292. [2020-07-21 15:53:08,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 15:53:08,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 481 transitions. [2020-07-21 15:53:08,926 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 481 transitions. Word has length 375 [2020-07-21 15:53:08,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:08,926 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 481 transitions. [2020-07-21 15:53:08,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:53:08,927 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 481 transitions. [2020-07-21 15:53:08,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 15:53:08,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:08,930 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 22, 22, 17, 16, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 11, 11, 11, 11, 10, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:09,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:09,131 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:09,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:09,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1226533921, now seen corresponding path program 35 times [2020-07-21 15:53:09,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:09,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860298005] [2020-07-21 15:53:09,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:09,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:53:09,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:09,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:53:09,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:10,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3116 backedges. 229 proven. 351 refuted. 0 times theorem prover too weak. 2536 trivial. 0 not checked. [2020-07-21 15:53:10,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:11,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:12,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3116 backedges. 229 proven. 361 refuted. 0 times theorem prover too weak. 2526 trivial. 0 not checked. [2020-07-21 15:53:12,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860298005] [2020-07-21 15:53:12,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:12,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:53:12,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397156611] [2020-07-21 15:53:12,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:53:12,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:12,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:53:12,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:53:12,860 INFO L87 Difference]: Start difference. First operand 292 states and 481 transitions. Second operand 16 states. [2020-07-21 15:53:13,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:13,291 INFO L93 Difference]: Finished difference Result 345 states and 625 transitions. [2020-07-21 15:53:13,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:53:13,293 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 334 [2020-07-21 15:53:13,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:13,298 INFO L225 Difference]: With dead ends: 345 [2020-07-21 15:53:13,299 INFO L226 Difference]: Without dead ends: 341 [2020-07-21 15:53:13,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 643 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:53:13,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2020-07-21 15:53:13,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 313. [2020-07-21 15:53:13,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2020-07-21 15:53:13,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 551 transitions. [2020-07-21 15:53:13,316 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 551 transitions. Word has length 334 [2020-07-21 15:53:13,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:13,316 INFO L479 AbstractCegarLoop]: Abstraction has 313 states and 551 transitions. [2020-07-21 15:53:13,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:53:13,316 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 551 transitions. [2020-07-21 15:53:13,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2020-07-21 15:53:13,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:13,320 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 23, 23, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 16, 15, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:13,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:13,521 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:13,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:13,522 INFO L82 PathProgramCache]: Analyzing trace with hash 24060687, now seen corresponding path program 36 times [2020-07-21 15:53:13,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:13,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705688114] [2020-07-21 15:53:13,523 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:14,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:53:14,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:14,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 15:53:14,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:14,655 INFO L134 CoverageAnalysis]: Checked inductivity of 7650 backedges. 4228 proven. 625 refuted. 0 times theorem prover too weak. 2797 trivial. 0 not checked. [2020-07-21 15:53:14,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:20,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:21,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:21,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:21,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:21,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:23,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:23,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:24,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:25,131 INFO L134 CoverageAnalysis]: Checked inductivity of 7650 backedges. 502 proven. 1654 refuted. 0 times theorem prover too weak. 5494 trivial. 0 not checked. [2020-07-21 15:53:25,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705688114] [2020-07-21 15:53:25,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:25,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 15:53:25,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054394171] [2020-07-21 15:53:25,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:53:25,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:25,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:53:25,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:53:25,134 INFO L87 Difference]: Start difference. First operand 313 states and 551 transitions. Second operand 29 states. [2020-07-21 15:53:28,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:28,150 INFO L93 Difference]: Finished difference Result 709 states and 1331 transitions. [2020-07-21 15:53:28,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 15:53:28,152 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 515 [2020-07-21 15:53:28,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:28,158 INFO L225 Difference]: With dead ends: 709 [2020-07-21 15:53:28,158 INFO L226 Difference]: Without dead ends: 399 [2020-07-21 15:53:28,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 979 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 15:53:28,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2020-07-21 15:53:28,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 287. [2020-07-21 15:53:28,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 15:53:28,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 472 transitions. [2020-07-21 15:53:28,179 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 472 transitions. Word has length 515 [2020-07-21 15:53:28,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:28,179 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 472 transitions. [2020-07-21 15:53:28,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 15:53:28,179 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 472 transitions. [2020-07-21 15:53:28,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 15:53:28,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:28,182 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 26, 26, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 13, 13, 13, 13, 13, 13, 13, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:28,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:28,383 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:28,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:28,384 INFO L82 PathProgramCache]: Analyzing trace with hash -92665153, now seen corresponding path program 37 times [2020-07-21 15:53:28,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:28,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091651458] [2020-07-21 15:53:28,385 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:29,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:53:29,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:29,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:53:29,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:29,259 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 341 proven. 329 refuted. 0 times theorem prover too weak. 3478 trivial. 0 not checked. [2020-07-21 15:53:29,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:31,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:31,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:32,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:33,626 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 341 proven. 341 refuted. 0 times theorem prover too weak. 3466 trivial. 0 not checked. [2020-07-21 15:53:33,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091651458] [2020-07-21 15:53:33,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:33,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:53:33,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662140754] [2020-07-21 15:53:33,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:53:33,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:33,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:53:33,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:53:33,628 INFO L87 Difference]: Start difference. First operand 287 states and 472 transitions. Second operand 16 states. [2020-07-21 15:53:34,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:34,075 INFO L93 Difference]: Finished difference Result 324 states and 578 transitions. [2020-07-21 15:53:34,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:53:34,078 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 382 [2020-07-21 15:53:34,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:34,083 INFO L225 Difference]: With dead ends: 324 [2020-07-21 15:53:34,083 INFO L226 Difference]: Without dead ends: 320 [2020-07-21 15:53:34,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 739 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:53:34,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-07-21 15:53:34,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 292. [2020-07-21 15:53:34,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 15:53:34,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 489 transitions. [2020-07-21 15:53:34,099 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 489 transitions. Word has length 382 [2020-07-21 15:53:34,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:34,099 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 489 transitions. [2020-07-21 15:53:34,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:53:34,099 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 489 transitions. [2020-07-21 15:53:34,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 15:53:34,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:34,102 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:34,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:34,303 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:34,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:34,303 INFO L82 PathProgramCache]: Analyzing trace with hash -2140252586, now seen corresponding path program 38 times [2020-07-21 15:53:34,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:34,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889273879] [2020-07-21 15:53:34,304 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:34,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:53:34,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:34,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:53:34,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:35,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 258 proven. 508 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-21 15:53:35,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:38,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:38,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:39,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:40,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:40,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:40,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:40,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:40,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:41,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:41,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 260 proven. 522 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-21 15:53:41,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889273879] [2020-07-21 15:53:41,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:41,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:53:41,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701221244] [2020-07-21 15:53:41,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:53:41,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:41,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:53:41,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:53:41,713 INFO L87 Difference]: Start difference. First operand 292 states and 489 transitions. Second operand 18 states. [2020-07-21 15:53:42,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:42,495 INFO L93 Difference]: Finished difference Result 354 states and 657 transitions. [2020-07-21 15:53:42,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:53:42,498 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 370 [2020-07-21 15:53:42,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:42,505 INFO L225 Difference]: With dead ends: 354 [2020-07-21 15:53:42,505 INFO L226 Difference]: Without dead ends: 350 [2020-07-21 15:53:42,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:53:42,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2020-07-21 15:53:42,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 297. [2020-07-21 15:53:42,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2020-07-21 15:53:42,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 503 transitions. [2020-07-21 15:53:42,535 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 503 transitions. Word has length 370 [2020-07-21 15:53:42,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:42,536 INFO L479 AbstractCegarLoop]: Abstraction has 297 states and 503 transitions. [2020-07-21 15:53:42,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:53:42,536 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 503 transitions. [2020-07-21 15:53:42,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 15:53:42,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:42,539 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 21, 20, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 14, 12, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:42,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:42,741 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:42,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:42,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1524744654, now seen corresponding path program 39 times [2020-07-21 15:53:42,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:42,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142768659] [2020-07-21 15:53:42,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:43,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:53:43,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:43,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:53:43,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:44,046 INFO L134 CoverageAnalysis]: Checked inductivity of 5780 backedges. 905 proven. 703 refuted. 0 times theorem prover too weak. 4172 trivial. 0 not checked. [2020-07-21 15:53:44,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:48,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:49,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:49,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:49,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:49,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:51,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:52,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:52,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:52,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:53,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:53:54,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5780 backedges. 909 proven. 719 refuted. 0 times theorem prover too weak. 4152 trivial. 0 not checked. [2020-07-21 15:53:54,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142768659] [2020-07-21 15:53:54,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:53:54,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 15:53:54,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520646771] [2020-07-21 15:53:54,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 15:53:54,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:54,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 15:53:54,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:53:54,345 INFO L87 Difference]: Start difference. First operand 297 states and 503 transitions. Second operand 27 states. [2020-07-21 15:53:58,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:53:58,394 INFO L93 Difference]: Finished difference Result 722 states and 1314 transitions. [2020-07-21 15:53:58,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 15:53:58,398 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 450 [2020-07-21 15:53:58,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:53:58,406 INFO L225 Difference]: With dead ends: 722 [2020-07-21 15:53:58,406 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 15:53:58,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 853 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=414, Invalid=2136, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 15:53:58,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 15:53:58,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 324. [2020-07-21 15:53:58,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-21 15:53:58,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 581 transitions. [2020-07-21 15:53:58,436 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 581 transitions. Word has length 450 [2020-07-21 15:53:58,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:53:58,436 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 581 transitions. [2020-07-21 15:53:58,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 15:53:58,437 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 581 transitions. [2020-07-21 15:53:58,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 15:53:58,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:53:58,441 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:53:58,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:58,657 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:53:58,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:53:58,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1138981697, now seen corresponding path program 40 times [2020-07-21 15:53:58,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:53:58,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087504947] [2020-07-21 15:53:58,659 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:53:59,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:53:59,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:53:59,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:53:59,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:59,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 384 proven. 352 refuted. 0 times theorem prover too weak. 2848 trivial. 0 not checked. [2020-07-21 15:53:59,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:54:03,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:03,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:03,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:04,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:05,825 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 386 proven. 366 refuted. 0 times theorem prover too weak. 2832 trivial. 0 not checked. [2020-07-21 15:54:05,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087504947] [2020-07-21 15:54:05,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:54:05,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:54:05,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779582191] [2020-07-21 15:54:05,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:54:05,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:54:05,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:54:05,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:54:05,828 INFO L87 Difference]: Start difference. First operand 324 states and 581 transitions. Second operand 18 states. [2020-07-21 15:54:06,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:54:06,483 INFO L93 Difference]: Finished difference Result 346 states and 628 transitions. [2020-07-21 15:54:06,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:54:06,486 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 358 [2020-07-21 15:54:06,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:54:06,492 INFO L225 Difference]: With dead ends: 346 [2020-07-21 15:54:06,492 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 15:54:06,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:54:06,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 15:54:06,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 311. [2020-07-21 15:54:06,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 311 states. [2020-07-21 15:54:06,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 540 transitions. [2020-07-21 15:54:06,512 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 540 transitions. Word has length 358 [2020-07-21 15:54:06,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:54:06,513 INFO L479 AbstractCegarLoop]: Abstraction has 311 states and 540 transitions. [2020-07-21 15:54:06,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:54:06,513 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 540 transitions. [2020-07-21 15:54:06,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 523 [2020-07-21 15:54:06,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:54:06,518 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 22, 21, 21, 21, 21, 21, 21, 21, 21, 20, 18, 18, 18, 18, 18, 18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:54:06,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:06,719 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:54:06,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:54:06,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1193277290, now seen corresponding path program 7 times [2020-07-21 15:54:06,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:54:06,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73180836] [2020-07-21 15:54:06,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:07,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:54:07,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:54:07,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 15:54:07,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:54:08,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7960 backedges. 729 proven. 1504 refuted. 0 times theorem prover too weak. 5727 trivial. 0 not checked. [2020-07-21 15:54:08,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:54:12,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:12,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:13,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:13,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:14,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:14,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:14,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:14,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:18,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:18,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:19,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:19,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:19,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:20,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:20,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:20,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:20,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:21,119 INFO L134 CoverageAnalysis]: Checked inductivity of 7960 backedges. 731 proven. 1533 refuted. 0 times theorem prover too weak. 5696 trivial. 0 not checked. [2020-07-21 15:54:21,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73180836] [2020-07-21 15:54:21,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:54:21,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 15:54:21,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700970931] [2020-07-21 15:54:21,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 15:54:21,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:54:21,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 15:54:21,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 15:54:21,122 INFO L87 Difference]: Start difference. First operand 311 states and 540 transitions. Second operand 31 states. [2020-07-21 15:54:24,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:54:24,617 INFO L93 Difference]: Finished difference Result 659 states and 1225 transitions. [2020-07-21 15:54:24,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 15:54:24,619 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 522 [2020-07-21 15:54:24,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:54:24,624 INFO L225 Difference]: With dead ends: 659 [2020-07-21 15:54:24,625 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 15:54:24,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 990 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=484, Invalid=2596, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 15:54:24,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 15:54:24,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 242. [2020-07-21 15:54:24,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-21 15:54:24,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 381 transitions. [2020-07-21 15:54:24,641 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 381 transitions. Word has length 522 [2020-07-21 15:54:24,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:54:24,642 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 381 transitions. [2020-07-21 15:54:24,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 15:54:24,642 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 381 transitions. [2020-07-21 15:54:24,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 15:54:24,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:54:24,644 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 17, 16, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 12, 12, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:54:24,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:24,845 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:54:24,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:54:24,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1564268195, now seen corresponding path program 41 times [2020-07-21 15:54:24,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:54:24,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210270322] [2020-07-21 15:54:24,847 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:25,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:54:25,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:54:25,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:54:25,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:54:25,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 622 proven. 170 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2020-07-21 15:54:25,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:54:28,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:28,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:29,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:29,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:29,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:30,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:30,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:32,491 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 626 proven. 182 refuted. 0 times theorem prover too weak. 3312 trivial. 0 not checked. [2020-07-21 15:54:32,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210270322] [2020-07-21 15:54:32,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:54:32,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:54:32,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101596732] [2020-07-21 15:54:32,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:54:32,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:54:32,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:54:32,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:54:32,494 INFO L87 Difference]: Start difference. First operand 242 states and 381 transitions. Second operand 18 states. [2020-07-21 15:54:33,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:54:33,206 INFO L93 Difference]: Finished difference Result 272 states and 448 transitions. [2020-07-21 15:54:33,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:54:33,208 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 382 [2020-07-21 15:54:33,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:54:33,212 INFO L225 Difference]: With dead ends: 272 [2020-07-21 15:54:33,212 INFO L226 Difference]: Without dead ends: 268 [2020-07-21 15:54:33,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 735 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:54:33,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-21 15:54:33,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 258. [2020-07-21 15:54:33,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-21 15:54:33,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 424 transitions. [2020-07-21 15:54:33,230 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 424 transitions. Word has length 382 [2020-07-21 15:54:33,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:54:33,230 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 424 transitions. [2020-07-21 15:54:33,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:54:33,230 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 424 transitions. [2020-07-21 15:54:33,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 15:54:33,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:54:33,232 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 17, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:54:33,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:33,434 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:54:33,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:54:33,435 INFO L82 PathProgramCache]: Analyzing trace with hash 340715003, now seen corresponding path program 42 times [2020-07-21 15:54:33,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:54:33,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911089749] [2020-07-21 15:54:33,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:34,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:54:34,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:54:34,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:54:34,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:54:34,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4696 backedges. 547 proven. 165 refuted. 0 times theorem prover too weak. 3984 trivial. 0 not checked. [2020-07-21 15:54:34,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:54:36,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:36,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:37,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:38,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:39,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4696 backedges. 549 proven. 173 refuted. 0 times theorem prover too weak. 3974 trivial. 0 not checked. [2020-07-21 15:54:39,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911089749] [2020-07-21 15:54:39,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:54:39,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:54:39,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538106887] [2020-07-21 15:54:39,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:54:39,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:54:39,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:54:39,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:54:39,943 INFO L87 Difference]: Start difference. First operand 258 states and 424 transitions. Second operand 16 states. [2020-07-21 15:54:40,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:54:40,548 INFO L93 Difference]: Finished difference Result 296 states and 514 transitions. [2020-07-21 15:54:40,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:54:40,552 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 406 [2020-07-21 15:54:40,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:54:40,557 INFO L225 Difference]: With dead ends: 296 [2020-07-21 15:54:40,557 INFO L226 Difference]: Without dead ends: 292 [2020-07-21 15:54:40,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 787 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:54:40,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-07-21 15:54:40,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 250. [2020-07-21 15:54:40,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2020-07-21 15:54:40,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 404 transitions. [2020-07-21 15:54:40,580 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 404 transitions. Word has length 406 [2020-07-21 15:54:40,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:54:40,580 INFO L479 AbstractCegarLoop]: Abstraction has 250 states and 404 transitions. [2020-07-21 15:54:40,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:54:40,581 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 404 transitions. [2020-07-21 15:54:40,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 15:54:40,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:54:40,585 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 17, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:54:40,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:40,800 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:54:40,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:54:40,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1562952590, now seen corresponding path program 43 times [2020-07-21 15:54:40,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:54:40,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683679379] [2020-07-21 15:54:40,802 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:41,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:54:41,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:54:41,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:54:41,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:54:41,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 174 proven. 964 refuted. 0 times theorem prover too weak. 3862 trivial. 0 not checked. [2020-07-21 15:54:41,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:54:47,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:49,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:50,702 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 15:54:51,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:51,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:52,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:52,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:52,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:52,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:54:53,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 174 proven. 994 refuted. 0 times theorem prover too weak. 3832 trivial. 0 not checked. [2020-07-21 15:54:53,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683679379] [2020-07-21 15:54:53,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:54:53,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 15:54:53,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70410651] [2020-07-21 15:54:53,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 15:54:53,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:54:53,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 15:54:53,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 15:54:53,005 INFO L87 Difference]: Start difference. First operand 250 states and 404 transitions. Second operand 22 states. [2020-07-21 15:54:54,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:54:54,051 INFO L93 Difference]: Finished difference Result 260 states and 420 transitions. [2020-07-21 15:54:54,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:54:54,055 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 418 [2020-07-21 15:54:54,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:54:54,059 INFO L225 Difference]: With dead ends: 260 [2020-07-21 15:54:54,059 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 15:54:54,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 799 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:54:54,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 15:54:54,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 230. [2020-07-21 15:54:54,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-21 15:54:54,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 358 transitions. [2020-07-21 15:54:54,074 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 358 transitions. Word has length 418 [2020-07-21 15:54:54,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:54:54,075 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 358 transitions. [2020-07-21 15:54:54,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 15:54:54,075 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 358 transitions. [2020-07-21 15:54:54,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 863 [2020-07-21 15:54:54,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:54:54,082 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 62, 62, 47, 46, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 18, 16, 16, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:54:54,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:54,283 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:54:54,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:54:54,284 INFO L82 PathProgramCache]: Analyzing trace with hash 9622478, now seen corresponding path program 44 times [2020-07-21 15:54:54,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:54:54,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3468509] [2020-07-21 15:54:54,285 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:54:55,181 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:54:55,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:54:55,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 1283 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 15:54:55,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:54:56,041 INFO L134 CoverageAnalysis]: Checked inductivity of 21844 backedges. 11888 proven. 1079 refuted. 0 times theorem prover too weak. 8877 trivial. 0 not checked. [2020-07-21 15:54:56,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:06,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:07,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:10,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:11,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:12,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:12,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:12,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:12,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:12,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:13,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:13,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 21844 backedges. 1021 proven. 3443 refuted. 0 times theorem prover too weak. 17380 trivial. 0 not checked. [2020-07-21 15:55:13,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3468509] [2020-07-21 15:55:13,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:55:13,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 15:55:13,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561346134] [2020-07-21 15:55:13,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 15:55:13,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:55:13,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 15:55:13,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:55:13,548 INFO L87 Difference]: Start difference. First operand 230 states and 358 transitions. Second operand 33 states. [2020-07-21 15:55:16,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:55:16,035 INFO L93 Difference]: Finished difference Result 496 states and 836 transitions. [2020-07-21 15:55:16,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 15:55:16,037 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 862 [2020-07-21 15:55:16,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:55:16,040 INFO L225 Difference]: With dead ends: 496 [2020-07-21 15:55:16,040 INFO L226 Difference]: Without dead ends: 272 [2020-07-21 15:55:16,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1748 GetRequests, 1665 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 15:55:16,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-21 15:55:16,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 234. [2020-07-21 15:55:16,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2020-07-21 15:55:16,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 361 transitions. [2020-07-21 15:55:16,055 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 361 transitions. Word has length 862 [2020-07-21 15:55:16,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:55:16,055 INFO L479 AbstractCegarLoop]: Abstraction has 234 states and 361 transitions. [2020-07-21 15:55:16,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 15:55:16,055 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 361 transitions. [2020-07-21 15:55:16,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 15:55:16,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:55:16,058 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 27, 27, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 13, 12, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:55:16,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:16,259 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:55:16,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:55:16,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1488145998, now seen corresponding path program 45 times [2020-07-21 15:55:16,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:55:16,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945943748] [2020-07-21 15:55:16,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:17,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:55:17,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:55:17,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1192 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:55:17,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:55:17,463 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 221 proven. 1314 refuted. 0 times theorem prover too weak. 6695 trivial. 0 not checked. [2020-07-21 15:55:17,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:22,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:22,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:23,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:24,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:25,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:26,178 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 221 proven. 1347 refuted. 0 times theorem prover too weak. 6662 trivial. 0 not checked. [2020-07-21 15:55:26,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945943748] [2020-07-21 15:55:26,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:55:26,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 15:55:26,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709814007] [2020-07-21 15:55:26,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 15:55:26,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:55:26,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 15:55:26,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 15:55:26,180 INFO L87 Difference]: Start difference. First operand 234 states and 361 transitions. Second operand 22 states. [2020-07-21 15:55:26,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:55:26,804 INFO L93 Difference]: Finished difference Result 274 states and 446 transitions. [2020-07-21 15:55:26,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:55:26,807 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 535 [2020-07-21 15:55:26,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:55:26,810 INFO L225 Difference]: With dead ends: 274 [2020-07-21 15:55:26,811 INFO L226 Difference]: Without dead ends: 270 [2020-07-21 15:55:26,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1077 GetRequests, 1033 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:55:26,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-21 15:55:26,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 264. [2020-07-21 15:55:26,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 15:55:26,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 430 transitions. [2020-07-21 15:55:26,827 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 430 transitions. Word has length 535 [2020-07-21 15:55:26,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:55:26,828 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 430 transitions. [2020-07-21 15:55:26,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 15:55:26,828 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 430 transitions. [2020-07-21 15:55:26,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-21 15:55:26,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:55:26,832 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 41, 41, 27, 27, 25, 25, 25, 25, 25, 25, 25, 23, 20, 20, 20, 20, 20, 20, 20, 14, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:55:27,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:27,034 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:55:27,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:55:27,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1248689886, now seen corresponding path program 46 times [2020-07-21 15:55:27,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:55:27,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134677420] [2020-07-21 15:55:27,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:28,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:55:28,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:55:28,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 1354 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:55:28,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:55:28,353 INFO L134 CoverageAnalysis]: Checked inductivity of 10842 backedges. 292 proven. 1243 refuted. 0 times theorem prover too weak. 9307 trivial. 0 not checked. [2020-07-21 15:55:28,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:32,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:32,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:33,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:34,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:34,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:35,937 INFO L134 CoverageAnalysis]: Checked inductivity of 10842 backedges. 292 proven. 1267 refuted. 0 times theorem prover too weak. 9283 trivial. 0 not checked. [2020-07-21 15:55:35,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134677420] [2020-07-21 15:55:35,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:55:35,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:55:35,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296459301] [2020-07-21 15:55:35,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:55:35,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:55:35,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:55:35,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:55:35,940 INFO L87 Difference]: Start difference. First operand 264 states and 430 transitions. Second operand 20 states. [2020-07-21 15:55:36,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:55:36,619 INFO L93 Difference]: Finished difference Result 318 states and 552 transitions. [2020-07-21 15:55:36,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:55:36,623 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 607 [2020-07-21 15:55:36,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:55:36,628 INFO L225 Difference]: With dead ends: 318 [2020-07-21 15:55:36,628 INFO L226 Difference]: Without dead ends: 314 [2020-07-21 15:55:36,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1220 GetRequests, 1181 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:55:36,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-21 15:55:36,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 248. [2020-07-21 15:55:36,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 15:55:36,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 390 transitions. [2020-07-21 15:55:36,651 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 390 transitions. Word has length 607 [2020-07-21 15:55:36,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:55:36,652 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 390 transitions. [2020-07-21 15:55:36,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:55:36,652 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 390 transitions. [2020-07-21 15:55:36,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-21 15:55:36,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:55:36,656 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 27, 27, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:55:36,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:36,858 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:55:36,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:55:36,860 INFO L82 PathProgramCache]: Analyzing trace with hash -704753948, now seen corresponding path program 47 times [2020-07-21 15:55:36,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:55:36,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643492427] [2020-07-21 15:55:36,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:38,010 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:55:38,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:55:38,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:55:38,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:55:38,343 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 285 proven. 992 refuted. 0 times theorem prover too weak. 6229 trivial. 0 not checked. [2020-07-21 15:55:38,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:42,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:45,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:45,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:46,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:47,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:47,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:47,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:47,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:48,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:48,450 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 285 proven. 1016 refuted. 0 times theorem prover too weak. 6205 trivial. 0 not checked. [2020-07-21 15:55:48,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643492427] [2020-07-21 15:55:48,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:55:48,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:55:48,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407842037] [2020-07-21 15:55:48,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:55:48,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:55:48,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:55:48,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:55:48,453 INFO L87 Difference]: Start difference. First operand 248 states and 390 transitions. Second operand 20 states. [2020-07-21 15:55:49,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:55:49,491 INFO L93 Difference]: Finished difference Result 308 states and 532 transitions. [2020-07-21 15:55:49,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:55:49,496 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 511 [2020-07-21 15:55:49,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:55:49,501 INFO L225 Difference]: With dead ends: 308 [2020-07-21 15:55:49,501 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 15:55:49,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 989 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:55:49,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 15:55:49,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 248. [2020-07-21 15:55:49,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 15:55:49,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 390 transitions. [2020-07-21 15:55:49,516 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 390 transitions. Word has length 511 [2020-07-21 15:55:49,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:55:49,517 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 390 transitions. [2020-07-21 15:55:49,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:55:49,517 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 390 transitions. [2020-07-21 15:55:49,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-21 15:55:49,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:55:49,526 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 35, 35, 27, 27, 23, 23, 23, 23, 23, 23, 23, 19, 17, 17, 17, 17, 17, 17, 17, 10, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:55:49,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:49,741 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:55:49,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:55:49,742 INFO L82 PathProgramCache]: Analyzing trace with hash -701659731, now seen corresponding path program 48 times [2020-07-21 15:55:49,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:55:49,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110479323] [2020-07-21 15:55:49,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:50,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:55:50,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:55:50,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 1219 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:55:50,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:55:50,995 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 348 proven. 855 refuted. 0 times theorem prover too weak. 7575 trivial. 0 not checked. [2020-07-21 15:55:50,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:57,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:59,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:59,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:55:59,847 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 15:56:00,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:01,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:01,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:01,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:01,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:02,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:03,071 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 348 proven. 871 refuted. 0 times theorem prover too weak. 7559 trivial. 0 not checked. [2020-07-21 15:56:03,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110479323] [2020-07-21 15:56:03,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:56:03,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:56:03,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367868219] [2020-07-21 15:56:03,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:56:03,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:56:03,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:56:03,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:56:03,074 INFO L87 Difference]: Start difference. First operand 248 states and 390 transitions. Second operand 18 states. [2020-07-21 15:56:04,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:56:04,129 INFO L93 Difference]: Finished difference Result 308 states and 531 transitions. [2020-07-21 15:56:04,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:56:04,136 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 547 [2020-07-21 15:56:04,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:56:04,140 INFO L225 Difference]: With dead ends: 308 [2020-07-21 15:56:04,141 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 15:56:04,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1099 GetRequests, 1065 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:56:04,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 15:56:04,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 254. [2020-07-21 15:56:04,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 15:56:04,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 405 transitions. [2020-07-21 15:56:04,159 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 405 transitions. Word has length 547 [2020-07-21 15:56:04,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:56:04,160 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 405 transitions. [2020-07-21 15:56:04,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:56:04,160 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 405 transitions. [2020-07-21 15:56:04,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 552 [2020-07-21 15:56:04,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:56:04,164 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 39, 39, 23, 23, 22, 22, 22, 22, 22, 22, 22, 21, 19, 19, 19, 19, 19, 19, 19, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:56:04,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:04,365 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:56:04,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:56:04,366 INFO L82 PathProgramCache]: Analyzing trace with hash 306376042, now seen corresponding path program 49 times [2020-07-21 15:56:04,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:56:04,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233642191] [2020-07-21 15:56:04,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:05,309 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:56:05,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:56:05,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 15:56:05,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:56:06,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8862 backedges. 1308 proven. 883 refuted. 0 times theorem prover too weak. 6671 trivial. 0 not checked. [2020-07-21 15:56:06,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:56:09,422 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 15:56:09,526 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 15:56:13,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:13,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:14,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:15,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:16,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:16,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:16,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:16,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:21,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:22,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:22,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:23,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:23,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:23,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:23,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:23,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:24,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 8862 backedges. 1308 proven. 909 refuted. 0 times theorem prover too weak. 6645 trivial. 0 not checked. [2020-07-21 15:56:25,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233642191] [2020-07-21 15:56:25,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:56:25,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 15:56:25,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481015932] [2020-07-21 15:56:25,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:56:25,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:56:25,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:56:25,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:56:25,974 INFO L87 Difference]: Start difference. First operand 254 states and 405 transitions. Second operand 29 states. [2020-07-21 15:56:29,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:56:29,933 INFO L93 Difference]: Finished difference Result 549 states and 909 transitions. [2020-07-21 15:56:29,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 15:56:29,938 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 551 [2020-07-21 15:56:29,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:56:29,942 INFO L225 Difference]: With dead ends: 549 [2020-07-21 15:56:29,943 INFO L226 Difference]: Without dead ends: 295 [2020-07-21 15:56:29,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1119 GetRequests, 1051 SyntacticMatches, 23 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=342, Invalid=1820, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 15:56:29,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2020-07-21 15:56:29,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 262. [2020-07-21 15:56:29,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2020-07-21 15:56:29,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 414 transitions. [2020-07-21 15:56:29,965 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 414 transitions. Word has length 551 [2020-07-21 15:56:29,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:56:29,965 INFO L479 AbstractCegarLoop]: Abstraction has 262 states and 414 transitions. [2020-07-21 15:56:29,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 15:56:29,965 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 414 transitions. [2020-07-21 15:56:29,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 15:56:29,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:56:29,970 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 27, 27, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 22, 21, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:56:30,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:30,171 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:56:30,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:56:30,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1119052651, now seen corresponding path program 50 times [2020-07-21 15:56:30,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:56:30,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007645705] [2020-07-21 15:56:30,173 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:31,181 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:56:31,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:56:31,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 1435 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:56:31,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:56:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 12126 backedges. 513 proven. 902 refuted. 0 times theorem prover too weak. 10711 trivial. 0 not checked. [2020-07-21 15:56:31,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:56:37,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:37,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:40,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:40,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:41,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:42,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:43,708 INFO L134 CoverageAnalysis]: Checked inductivity of 12126 backedges. 515 proven. 916 refuted. 0 times theorem prover too weak. 10695 trivial. 0 not checked. [2020-07-21 15:56:43,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007645705] [2020-07-21 15:56:43,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:56:43,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:56:43,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323970664] [2020-07-21 15:56:43,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:56:43,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:56:43,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:56:43,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:56:43,711 INFO L87 Difference]: Start difference. First operand 262 states and 414 transitions. Second operand 18 states. [2020-07-21 15:56:44,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:56:44,523 INFO L93 Difference]: Finished difference Result 300 states and 494 transitions. [2020-07-21 15:56:44,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:56:44,526 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 643 [2020-07-21 15:56:44,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:56:44,530 INFO L225 Difference]: With dead ends: 300 [2020-07-21 15:56:44,530 INFO L226 Difference]: Without dead ends: 296 [2020-07-21 15:56:44,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1291 GetRequests, 1257 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:56:44,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-21 15:56:44,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 268. [2020-07-21 15:56:44,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 15:56:44,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 432 transitions. [2020-07-21 15:56:44,545 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 432 transitions. Word has length 643 [2020-07-21 15:56:44,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:56:44,546 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 432 transitions. [2020-07-21 15:56:44,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:56:44,546 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 432 transitions. [2020-07-21 15:56:44,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 620 [2020-07-21 15:56:44,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:56:44,550 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 44, 44, 27, 27, 24, 24, 24, 24, 24, 24, 24, 22, 22, 22, 22, 22, 22, 22, 22, 17, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:56:44,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:44,751 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:56:44,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:56:44,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1834203243, now seen corresponding path program 51 times [2020-07-21 15:56:44,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:56:44,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661047444] [2020-07-21 15:56:44,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:45,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:56:45,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:56:45,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 1381 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:56:45,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:56:46,186 INFO L134 CoverageAnalysis]: Checked inductivity of 11218 backedges. 486 proven. 867 refuted. 0 times theorem prover too weak. 9865 trivial. 0 not checked. [2020-07-21 15:56:46,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:56:53,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:53,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:55,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:55,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:55,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:56,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:56,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:56,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:56,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:57,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:56:58,484 INFO L134 CoverageAnalysis]: Checked inductivity of 11218 backedges. 486 proven. 885 refuted. 0 times theorem prover too weak. 9847 trivial. 0 not checked. [2020-07-21 15:56:58,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661047444] [2020-07-21 15:56:58,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:56:58,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:56:58,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460689052] [2020-07-21 15:56:58,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:56:58,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:56:58,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:56:58,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:56:58,486 INFO L87 Difference]: Start difference. First operand 268 states and 432 transitions. Second operand 18 states. [2020-07-21 15:56:59,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:56:59,303 INFO L93 Difference]: Finished difference Result 316 states and 538 transitions. [2020-07-21 15:56:59,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:56:59,306 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 619 [2020-07-21 15:56:59,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:56:59,310 INFO L225 Difference]: With dead ends: 316 [2020-07-21 15:56:59,310 INFO L226 Difference]: Without dead ends: 312 [2020-07-21 15:56:59,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 1209 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:56:59,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2020-07-21 15:56:59,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 272. [2020-07-21 15:56:59,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 15:56:59,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 440 transitions. [2020-07-21 15:56:59,328 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 440 transitions. Word has length 619 [2020-07-21 15:56:59,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:56:59,328 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 440 transitions. [2020-07-21 15:56:59,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:56:59,328 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 440 transitions. [2020-07-21 15:56:59,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-21 15:56:59,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:56:59,332 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 40, 40, 27, 27, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 18, 13, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:56:59,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:56:59,536 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:56:59,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:56:59,537 INFO L82 PathProgramCache]: Analyzing trace with hash -924695093, now seen corresponding path program 52 times [2020-07-21 15:56:59,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:56:59,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145201146] [2020-07-21 15:56:59,538 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:00,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:57:00,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:57:00,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 1273 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:57:00,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:57:00,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9466 backedges. 513 proven. 944 refuted. 0 times theorem prover too weak. 8009 trivial. 0 not checked. [2020-07-21 15:57:00,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:57:07,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:07,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:10,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:10,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:10,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:10,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:11,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:12,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:13,815 INFO L134 CoverageAnalysis]: Checked inductivity of 9466 backedges. 515 proven. 966 refuted. 0 times theorem prover too weak. 7985 trivial. 0 not checked. [2020-07-21 15:57:13,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145201146] [2020-07-21 15:57:13,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:57:13,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:57:13,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907530219] [2020-07-21 15:57:13,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:57:13,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:57:13,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:57:13,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:57:13,818 INFO L87 Difference]: Start difference. First operand 272 states and 440 transitions. Second operand 20 states. [2020-07-21 15:57:14,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:57:14,646 INFO L93 Difference]: Finished difference Result 304 states and 502 transitions. [2020-07-21 15:57:14,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:57:14,651 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 571 [2020-07-21 15:57:14,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:57:14,654 INFO L225 Difference]: With dead ends: 304 [2020-07-21 15:57:14,655 INFO L226 Difference]: Without dead ends: 300 [2020-07-21 15:57:14,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 1109 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:57:14,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2020-07-21 15:57:14,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 259. [2020-07-21 15:57:14,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2020-07-21 15:57:14,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 408 transitions. [2020-07-21 15:57:14,671 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 408 transitions. Word has length 571 [2020-07-21 15:57:14,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:57:14,672 INFO L479 AbstractCegarLoop]: Abstraction has 259 states and 408 transitions. [2020-07-21 15:57:14,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:57:14,672 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 408 transitions. [2020-07-21 15:57:14,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 15:57:14,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:57:14,676 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 43, 43, 27, 27, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 16, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:57:14,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:14,877 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:57:14,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:57:14,877 INFO L82 PathProgramCache]: Analyzing trace with hash -349693715, now seen corresponding path program 53 times [2020-07-21 15:57:14,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:57:14,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592453596] [2020-07-21 15:57:14,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:15,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:57:15,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:57:15,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 1327 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:57:15,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:57:16,201 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 667 proven. 640 refuted. 0 times theorem prover too weak. 8999 trivial. 0 not checked. [2020-07-21 15:57:16,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:57:20,822 WARN L193 SmtUtils]: Spent 681.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 15:57:22,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:23,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:23,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:24,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:24,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:24,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:25,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:25,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:25,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:26,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:28,656 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 669 proven. 654 refuted. 0 times theorem prover too weak. 8983 trivial. 0 not checked. [2020-07-21 15:57:28,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592453596] [2020-07-21 15:57:28,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:57:28,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:57:28,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056094978] [2020-07-21 15:57:28,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:57:28,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:57:28,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:57:28,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:57:28,659 INFO L87 Difference]: Start difference. First operand 259 states and 408 transitions. Second operand 18 states. [2020-07-21 15:57:29,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:57:29,457 INFO L93 Difference]: Finished difference Result 297 states and 492 transitions. [2020-07-21 15:57:29,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:57:29,462 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-21 15:57:29,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:57:29,466 INFO L225 Difference]: With dead ends: 297 [2020-07-21 15:57:29,466 INFO L226 Difference]: Without dead ends: 293 [2020-07-21 15:57:29,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:57:29,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-07-21 15:57:29,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 275. [2020-07-21 15:57:29,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-21 15:57:29,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 450 transitions. [2020-07-21 15:57:29,484 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 450 transitions. Word has length 595 [2020-07-21 15:57:29,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:57:29,485 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 450 transitions. [2020-07-21 15:57:29,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:57:29,485 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 450 transitions. [2020-07-21 15:57:29,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 632 [2020-07-21 15:57:29,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:57:29,489 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 46, 46, 27, 27, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 22, 19, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:57:29,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:29,690 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:57:29,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:57:29,692 INFO L82 PathProgramCache]: Analyzing trace with hash 276443206, now seen corresponding path program 54 times [2020-07-21 15:57:29,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:57:29,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202693962] [2020-07-21 15:57:29,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:30,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:57:30,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:57:30,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 1408 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:57:30,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:57:31,164 INFO L134 CoverageAnalysis]: Checked inductivity of 11662 backedges. 780 proven. 839 refuted. 0 times theorem prover too weak. 10043 trivial. 0 not checked. [2020-07-21 15:57:31,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:57:39,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:40,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:40,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:41,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:42,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:42,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:42,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:42,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:43,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:46,392 INFO L134 CoverageAnalysis]: Checked inductivity of 11662 backedges. 784 proven. 859 refuted. 0 times theorem prover too weak. 10019 trivial. 0 not checked. [2020-07-21 15:57:46,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202693962] [2020-07-21 15:57:46,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:57:46,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:57:46,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877370252] [2020-07-21 15:57:46,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:57:46,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:57:46,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:57:46,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:57:46,394 INFO L87 Difference]: Start difference. First operand 275 states and 450 transitions. Second operand 20 states. [2020-07-21 15:57:47,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:57:47,433 INFO L93 Difference]: Finished difference Result 307 states and 518 transitions. [2020-07-21 15:57:47,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:57:47,438 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 631 [2020-07-21 15:57:47,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:57:47,442 INFO L225 Difference]: With dead ends: 307 [2020-07-21 15:57:47,442 INFO L226 Difference]: Without dead ends: 303 [2020-07-21 15:57:47,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1268 GetRequests, 1229 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:57:47,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2020-07-21 15:57:47,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 267. [2020-07-21 15:57:47,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-21 15:57:47,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 429 transitions. [2020-07-21 15:57:47,458 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 429 transitions. Word has length 631 [2020-07-21 15:57:47,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:57:47,459 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 429 transitions. [2020-07-21 15:57:47,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:57:47,459 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 429 transitions. [2020-07-21 15:57:47,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 15:57:47,462 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:57:47,462 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 44, 44, 27, 27, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 18, 17, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:57:47,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:47,664 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:57:47,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:57:47,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1933036351, now seen corresponding path program 55 times [2020-07-21 15:57:47,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:57:47,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66895837] [2020-07-21 15:57:47,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:48,730 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:57:48,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:57:48,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 1327 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:57:48,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:57:49,072 INFO L134 CoverageAnalysis]: Checked inductivity of 10294 backedges. 759 proven. 544 refuted. 0 times theorem prover too weak. 8991 trivial. 0 not checked. [2020-07-21 15:57:49,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:57:55,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:55,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:56,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:56,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:56,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:56,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:57,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:57,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:57:58,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:01,158 INFO L134 CoverageAnalysis]: Checked inductivity of 10294 backedges. 763 proven. 556 refuted. 0 times theorem prover too weak. 8975 trivial. 0 not checked. [2020-07-21 15:58:01,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66895837] [2020-07-21 15:58:01,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:58:01,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:58:01,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477371252] [2020-07-21 15:58:01,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:58:01,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:58:01,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:58:01,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:58:01,161 INFO L87 Difference]: Start difference. First operand 267 states and 429 transitions. Second operand 18 states. [2020-07-21 15:58:01,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:58:01,912 INFO L93 Difference]: Finished difference Result 300 states and 500 transitions. [2020-07-21 15:58:01,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:58:01,916 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-21 15:58:01,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:58:01,920 INFO L225 Difference]: With dead ends: 300 [2020-07-21 15:58:01,920 INFO L226 Difference]: Without dead ends: 296 [2020-07-21 15:58:01,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:58:01,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-21 15:58:01,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 270. [2020-07-21 15:58:01,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 15:58:01,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 436 transitions. [2020-07-21 15:58:01,935 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 436 transitions. Word has length 595 [2020-07-21 15:58:01,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:58:01,936 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 436 transitions. [2020-07-21 15:58:01,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:58:01,936 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 436 transitions. [2020-07-21 15:58:01,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 656 [2020-07-21 15:58:01,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:58:01,940 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 23, 22, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:58:02,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:02,141 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:58:02,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:58:02,142 INFO L82 PathProgramCache]: Analyzing trace with hash -739790298, now seen corresponding path program 56 times [2020-07-21 15:58:02,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:58:02,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156530024] [2020-07-21 15:58:02,143 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:03,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:03,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:03,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 1462 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:58:03,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:58:03,565 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 723 proven. 720 refuted. 0 times theorem prover too weak. 11167 trivial. 0 not checked. [2020-07-21 15:58:03,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:58:10,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:11,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:12,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:13,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:13,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:13,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:13,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:13,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:14,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:17,431 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 723 proven. 738 refuted. 0 times theorem prover too weak. 11149 trivial. 0 not checked. [2020-07-21 15:58:17,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156530024] [2020-07-21 15:58:17,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:58:17,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:58:17,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124936064] [2020-07-21 15:58:17,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:58:17,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:58:17,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:58:17,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:58:17,434 INFO L87 Difference]: Start difference. First operand 270 states and 436 transitions. Second operand 18 states. [2020-07-21 15:58:18,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:58:18,308 INFO L93 Difference]: Finished difference Result 308 states and 523 transitions. [2020-07-21 15:58:18,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:58:18,313 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 655 [2020-07-21 15:58:18,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:58:18,317 INFO L225 Difference]: With dead ends: 308 [2020-07-21 15:58:18,317 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 15:58:18,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1315 GetRequests, 1281 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:58:18,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 15:58:18,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 267. [2020-07-21 15:58:18,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-21 15:58:18,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 428 transitions. [2020-07-21 15:58:18,333 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 428 transitions. Word has length 655 [2020-07-21 15:58:18,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:58:18,333 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 428 transitions. [2020-07-21 15:58:18,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:58:18,334 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 428 transitions. [2020-07-21 15:58:18,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 668 [2020-07-21 15:58:18,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:58:18,338 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 49, 49, 27, 27, 26, 26, 26, 26, 26, 26, 26, 25, 24, 24, 24, 24, 24, 24, 24, 22, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:58:18,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:18,539 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:58:18,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:58:18,540 INFO L82 PathProgramCache]: Analyzing trace with hash -166149141, now seen corresponding path program 57 times [2020-07-21 15:58:18,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:58:18,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978753800] [2020-07-21 15:58:18,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:19,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:19,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:19,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:58:19,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:58:20,108 INFO L134 CoverageAnalysis]: Checked inductivity of 13114 backedges. 1083 proven. 390 refuted. 0 times theorem prover too weak. 11641 trivial. 0 not checked. [2020-07-21 15:58:20,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:58:24,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:25,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:25,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:26,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:26,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:26,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:27,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:27,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:27,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:28,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:32,774 INFO L134 CoverageAnalysis]: Checked inductivity of 13114 backedges. 1085 proven. 406 refuted. 0 times theorem prover too weak. 11623 trivial. 0 not checked. [2020-07-21 15:58:32,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978753800] [2020-07-21 15:58:32,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:58:32,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:58:32,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999844233] [2020-07-21 15:58:32,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:58:32,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:58:32,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:58:32,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:58:32,776 INFO L87 Difference]: Start difference. First operand 267 states and 428 transitions. Second operand 18 states. [2020-07-21 15:58:33,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:58:33,583 INFO L93 Difference]: Finished difference Result 300 states and 507 transitions. [2020-07-21 15:58:33,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:58:33,588 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 667 [2020-07-21 15:58:33,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:58:33,592 INFO L225 Difference]: With dead ends: 300 [2020-07-21 15:58:33,593 INFO L226 Difference]: Without dead ends: 296 [2020-07-21 15:58:33,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1339 GetRequests, 1305 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:58:33,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-21 15:58:33,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 288. [2020-07-21 15:58:33,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 15:58:33,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 484 transitions. [2020-07-21 15:58:33,609 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 484 transitions. Word has length 667 [2020-07-21 15:58:33,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:58:33,609 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 484 transitions. [2020-07-21 15:58:33,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:58:33,609 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 484 transitions. [2020-07-21 15:58:33,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 704 [2020-07-21 15:58:33,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:58:33,614 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:58:33,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:33,815 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:58:33,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:58:33,816 INFO L82 PathProgramCache]: Analyzing trace with hash 991479732, now seen corresponding path program 8 times [2020-07-21 15:58:33,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:58:33,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104184520] [2020-07-21 15:58:33,817 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:35,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:35,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:35,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 1570 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:58:35,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:58:35,388 INFO L134 CoverageAnalysis]: Checked inductivity of 14642 backedges. 1136 proven. 421 refuted. 0 times theorem prover too weak. 13085 trivial. 0 not checked. [2020-07-21 15:58:35,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:58:39,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:39,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:41,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:41,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:42,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:42,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:43,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:43,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:43,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:43,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:43,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:44,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:58:49,093 INFO L134 CoverageAnalysis]: Checked inductivity of 14642 backedges. 1140 proven. 433 refuted. 0 times theorem prover too weak. 13069 trivial. 0 not checked. [2020-07-21 15:58:49,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104184520] [2020-07-21 15:58:49,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:58:49,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 15:58:49,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499045158] [2020-07-21 15:58:49,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:58:49,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:58:49,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:58:49,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:58:49,096 INFO L87 Difference]: Start difference. First operand 288 states and 484 transitions. Second operand 18 states. [2020-07-21 15:58:49,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:58:49,983 INFO L93 Difference]: Finished difference Result 329 states and 587 transitions. [2020-07-21 15:58:49,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:58:49,988 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 703 [2020-07-21 15:58:49,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:58:49,994 INFO L225 Difference]: With dead ends: 329 [2020-07-21 15:58:49,994 INFO L226 Difference]: Without dead ends: 325 [2020-07-21 15:58:49,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1413 GetRequests, 1379 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:58:49,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2020-07-21 15:58:50,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 285. [2020-07-21 15:58:50,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2020-07-21 15:58:50,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 476 transitions. [2020-07-21 15:58:50,014 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 476 transitions. Word has length 703 [2020-07-21 15:58:50,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:58:50,014 INFO L479 AbstractCegarLoop]: Abstraction has 285 states and 476 transitions. [2020-07-21 15:58:50,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:58:50,014 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 476 transitions. [2020-07-21 15:58:50,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 632 [2020-07-21 15:58:50,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:58:50,019 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 44, 44, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 22, 22, 22, 22, 22, 22, 22, 17, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:58:50,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:50,220 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:58:50,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:58:50,221 INFO L82 PathProgramCache]: Analyzing trace with hash 774208310, now seen corresponding path program 58 times [2020-07-21 15:58:50,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:58:50,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079444790] [2020-07-21 15:58:50,222 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:51,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:51,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:51,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 1408 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:58:51,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:58:51,960 INFO L134 CoverageAnalysis]: Checked inductivity of 11710 backedges. 650 proven. 512 refuted. 0 times theorem prover too weak. 10548 trivial. 0 not checked. [2020-07-21 15:58:51,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:58:59,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:00,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:00,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:00,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:00,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:01,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:02,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:05,545 INFO L134 CoverageAnalysis]: Checked inductivity of 11710 backedges. 650 proven. 524 refuted. 0 times theorem prover too weak. 10536 trivial. 0 not checked. [2020-07-21 15:59:05,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079444790] [2020-07-21 15:59:05,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:05,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:59:05,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284038307] [2020-07-21 15:59:05,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:59:05,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:05,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:59:05,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:59:05,547 INFO L87 Difference]: Start difference. First operand 285 states and 476 transitions. Second operand 16 states. [2020-07-21 15:59:06,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:06,297 INFO L93 Difference]: Finished difference Result 323 states and 563 transitions. [2020-07-21 15:59:06,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:59:06,305 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 631 [2020-07-21 15:59:06,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:06,310 INFO L225 Difference]: With dead ends: 323 [2020-07-21 15:59:06,310 INFO L226 Difference]: Without dead ends: 319 [2020-07-21 15:59:06,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1266 GetRequests, 1237 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:06,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2020-07-21 15:59:06,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 282. [2020-07-21 15:59:06,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-07-21 15:59:06,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 468 transitions. [2020-07-21 15:59:06,329 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 468 transitions. Word has length 631 [2020-07-21 15:59:06,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:06,329 INFO L479 AbstractCegarLoop]: Abstraction has 282 states and 468 transitions. [2020-07-21 15:59:06,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:59:06,329 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 468 transitions. [2020-07-21 15:59:06,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 668 [2020-07-21 15:59:06,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:06,334 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 48, 48, 27, 27, 26, 26, 26, 26, 26, 26, 26, 26, 24, 24, 24, 24, 24, 24, 24, 21, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:06,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:06,535 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:06,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:06,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1498279183, now seen corresponding path program 59 times [2020-07-21 15:59:06,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:06,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803222567] [2020-07-21 15:59:06,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:07,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:07,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:07,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:59:07,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:08,196 INFO L134 CoverageAnalysis]: Checked inductivity of 13130 backedges. 1264 proven. 457 refuted. 0 times theorem prover too weak. 11409 trivial. 0 not checked. [2020-07-21 15:59:08,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:13,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:14,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:14,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:15,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:16,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:16,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:17,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:17,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:17,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:17,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:18,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:21,422 INFO L134 CoverageAnalysis]: Checked inductivity of 13130 backedges. 1268 proven. 477 refuted. 0 times theorem prover too weak. 11385 trivial. 0 not checked. [2020-07-21 15:59:21,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803222567] [2020-07-21 15:59:21,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:21,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 15:59:21,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133185528] [2020-07-21 15:59:21,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:59:21,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:21,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:59:21,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:59:21,424 INFO L87 Difference]: Start difference. First operand 282 states and 468 transitions. Second operand 20 states. [2020-07-21 15:59:22,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:22,110 INFO L93 Difference]: Finished difference Result 312 states and 539 transitions. [2020-07-21 15:59:22,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:59:22,113 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 667 [2020-07-21 15:59:22,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:22,117 INFO L225 Difference]: With dead ends: 312 [2020-07-21 15:59:22,117 INFO L226 Difference]: Without dead ends: 308 [2020-07-21 15:59:22,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1340 GetRequests, 1301 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 15:59:22,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2020-07-21 15:59:22,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 272. [2020-07-21 15:59:22,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 15:59:22,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 443 transitions. [2020-07-21 15:59:22,132 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 443 transitions. Word has length 667 [2020-07-21 15:59:22,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:22,132 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 443 transitions. [2020-07-21 15:59:22,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:59:22,132 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 443 transitions. [2020-07-21 15:59:22,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 704 [2020-07-21 15:59:22,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:22,137 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 52, 52, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:22,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:22,338 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:22,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:22,338 INFO L82 PathProgramCache]: Analyzing trace with hash -324360142, now seen corresponding path program 7 times [2020-07-21 15:59:22,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:22,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002291940] [2020-07-21 15:59:22,339 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:23,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:23,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:23,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 1570 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:59:23,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:23,995 INFO L134 CoverageAnalysis]: Checked inductivity of 14650 backedges. 327 proven. 1971 refuted. 0 times theorem prover too weak. 12352 trivial. 0 not checked. [2020-07-21 15:59:23,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:26,711 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:59:31,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:36,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:36,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,862 INFO L134 CoverageAnalysis]: Checked inductivity of 14650 backedges. 327 proven. 2011 refuted. 0 times theorem prover too weak. 12312 trivial. 0 not checked. [2020-07-21 15:59:38,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002291940] [2020-07-21 15:59:38,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:38,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 15:59:38,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352409485] [2020-07-21 15:59:38,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 15:59:38,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:38,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 15:59:38,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 15:59:38,864 INFO L87 Difference]: Start difference. First operand 272 states and 443 transitions. Second operand 24 states. [2020-07-21 15:59:39,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:39,883 INFO L93 Difference]: Finished difference Result 282 states and 461 transitions. [2020-07-21 15:59:39,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:59:39,888 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 703 [2020-07-21 15:59:39,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:39,892 INFO L225 Difference]: With dead ends: 282 [2020-07-21 15:59:39,892 INFO L226 Difference]: Without dead ends: 278 [2020-07-21 15:59:39,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1415 GetRequests, 1366 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:59:39,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-07-21 15:59:39,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 242. [2020-07-21 15:59:39,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-21 15:59:39,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 372 transitions. [2020-07-21 15:59:39,916 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 372 transitions. Word has length 703 [2020-07-21 15:59:39,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:39,917 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 372 transitions. [2020-07-21 15:59:39,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 15:59:39,917 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 372 transitions. [2020-07-21 15:59:39,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1108 [2020-07-21 15:59:39,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:39,932 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 79, 79, 61, 61, 42, 42, 42, 42, 42, 42, 42, 39, 39, 39, 39, 39, 39, 39, 23, 22, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:40,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:40,145 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:40,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:40,145 INFO L82 PathProgramCache]: Analyzing trace with hash -331211462, now seen corresponding path program 60 times [2020-07-21 15:59:40,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:40,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858342192] [2020-07-21 15:59:40,146 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:41,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:41,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:41,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 1647 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 15:59:41,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:42,433 INFO L134 CoverageAnalysis]: Checked inductivity of 36336 backedges. 15976 proven. 2711 refuted. 0 times theorem prover too weak. 17649 trivial. 0 not checked. [2020-07-21 15:59:42,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:56,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:56,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:00,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,381 INFO L134 CoverageAnalysis]: Checked inductivity of 36336 backedges. 1834 proven. 4498 refuted. 0 times theorem prover too weak. 30004 trivial. 0 not checked. [2020-07-21 16:00:08,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858342192] [2020-07-21 16:00:08,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:08,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 37 [2020-07-21 16:00:08,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713077976] [2020-07-21 16:00:08,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 16:00:08,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:08,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 16:00:08,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:08,383 INFO L87 Difference]: Start difference. First operand 242 states and 372 transitions. Second operand 37 states. [2020-07-21 16:00:14,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:14,551 INFO L93 Difference]: Finished difference Result 630 states and 1158 transitions. [2020-07-21 16:00:14,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 16:00:14,556 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1107 [2020-07-21 16:00:14,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:14,561 INFO L225 Difference]: With dead ends: 630 [2020-07-21 16:00:14,561 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 16:00:14,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2251 GetRequests, 2151 SyntacticMatches, 27 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=810, Invalid=4740, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 16:00:14,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 16:00:14,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 335. [2020-07-21 16:00:14,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 335 states. [2020-07-21 16:00:14,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 575 transitions. [2020-07-21 16:00:14,579 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 575 transitions. Word has length 1107 [2020-07-21 16:00:14,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:14,580 INFO L479 AbstractCegarLoop]: Abstraction has 335 states and 575 transitions. [2020-07-21 16:00:14,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 16:00:14,580 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 575 transitions. [2020-07-21 16:00:14,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1047 [2020-07-21 16:00:14,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:14,591 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 76, 76, 55, 54, 39, 39, 39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 38, 38, 24, 22, 17, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:14,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:14,792 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:14,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:14,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1908007918, now seen corresponding path program 61 times [2020-07-21 16:00:14,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:14,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988370448] [2020-07-21 16:00:14,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:16,247 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:16,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:16,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 1551 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 16:00:16,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:17,218 INFO L134 CoverageAnalysis]: Checked inductivity of 32416 backedges. 1980 proven. 4050 refuted. 0 times theorem prover too weak. 26386 trivial. 0 not checked. [2020-07-21 16:00:17,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:27,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,980 INFO L134 CoverageAnalysis]: Checked inductivity of 32416 backedges. 1984 proven. 4103 refuted. 0 times theorem prover too weak. 26329 trivial. 0 not checked. [2020-07-21 16:00:44,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988370448] [2020-07-21 16:00:44,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:44,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-21 16:00:44,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232186692] [2020-07-21 16:00:44,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 16:00:44,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:44,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 16:00:44,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:44,983 INFO L87 Difference]: Start difference. First operand 335 states and 575 transitions. Second operand 37 states. [2020-07-21 16:00:52,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:52,653 INFO L93 Difference]: Finished difference Result 862 states and 1650 transitions. [2020-07-21 16:00:52,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 16:00:52,660 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1046 [2020-07-21 16:00:52,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:52,667 INFO L225 Difference]: With dead ends: 862 [2020-07-21 16:00:52,667 INFO L226 Difference]: Without dead ends: 481 [2020-07-21 16:00:52,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2127 GetRequests, 2025 SyntacticMatches, 31 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1217 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=770, Invalid=4486, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 16:00:52,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2020-07-21 16:00:52,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 416. [2020-07-21 16:00:52,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 16:00:52,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 755 transitions. [2020-07-21 16:00:52,701 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 755 transitions. Word has length 1046 [2020-07-21 16:00:52,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:52,702 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 755 transitions. [2020-07-21 16:00:52,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 16:00:52,702 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 755 transitions. [2020-07-21 16:00:52,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 762 [2020-07-21 16:00:52,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:52,708 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 54, 54, 44, 44, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 17, 16, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:52,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:52,909 INFO L427 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:52,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:52,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1585096584, now seen corresponding path program 62 times [2020-07-21 16:00:52,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:52,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986989975] [2020-07-21 16:00:52,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:54,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:54,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 1692 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:00:54,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:54,981 INFO L134 CoverageAnalysis]: Checked inductivity of 16916 backedges. 346 proven. 2209 refuted. 0 times theorem prover too weak. 14361 trivial. 0 not checked. [2020-07-21 16:00:54,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:58,111 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:00:58,221 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:00:58,347 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:00:58,473 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:00:59,484 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:00:59,615 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:00:59,753 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:00:59,891 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:01:00,023 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 16:01:00,135 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 16:01:00,245 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 16:01:00,352 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 16:01:07,320 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:07,434 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:08,097 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:08,215 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:08,338 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:01:08,458 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:01:08,577 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:01:08,688 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:01:09,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,380 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:14,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,781 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:17,899 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:18,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,611 INFO L134 CoverageAnalysis]: Checked inductivity of 16916 backedges. 346 proven. 2253 refuted. 0 times theorem prover too weak. 14317 trivial. 0 not checked. [2020-07-21 16:01:23,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986989975] [2020-07-21 16:01:23,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:23,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 16:01:23,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414424572] [2020-07-21 16:01:23,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:23,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:23,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:23,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:23,614 INFO L87 Difference]: Start difference. First operand 416 states and 755 transitions. Second operand 23 states. [2020-07-21 16:01:25,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:25,269 INFO L93 Difference]: Finished difference Result 432 states and 792 transitions. [2020-07-21 16:01:25,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:01:25,277 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 761 [2020-07-21 16:01:25,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:25,282 INFO L225 Difference]: With dead ends: 432 [2020-07-21 16:01:25,282 INFO L226 Difference]: Without dead ends: 428 [2020-07-21 16:01:25,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1530 GetRequests, 1481 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:01:25,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2020-07-21 16:01:25,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 416. [2020-07-21 16:01:25,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 16:01:25,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 755 transitions. [2020-07-21 16:01:25,328 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 755 transitions. Word has length 761 [2020-07-21 16:01:25,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:25,329 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 755 transitions. [2020-07-21 16:01:25,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:25,329 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 755 transitions. [2020-07-21 16:01:25,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 999 [2020-07-21 16:01:25,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:25,345 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 68, 68, 55, 54, 39, 39, 39, 39, 39, 39, 39, 34, 34, 34, 34, 34, 34, 34, 24, 21, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:25,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:25,559 INFO L427 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:25,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:25,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1068459602, now seen corresponding path program 63 times [2020-07-21 16:01:25,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:25,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894257131] [2020-07-21 16:01:25,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:26,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:26,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:26,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 1483 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:01:27,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:28,231 INFO L134 CoverageAnalysis]: Checked inductivity of 29560 backedges. 2287 proven. 3116 refuted. 0 times theorem prover too weak. 24157 trivial. 0 not checked. [2020-07-21 16:01:28,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:29,400 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 16:01:32,730 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:32,842 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:33,305 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:33,414 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:33,532 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:33,652 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:34,414 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:34,541 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:34,676 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:01:34,810 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:01:36,578 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:36,684 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:37,157 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:37,276 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:37,405 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:37,527 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:38,349 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:38,479 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:01:38,616 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:01:38,746 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:01:38,872 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 16:01:38,984 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 16:01:39,087 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:01:39,193 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:01:44,359 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:01:44,847 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:44,952 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:01:45,067 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:45,183 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:01:45,291 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:01:45,399 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:01:45,509 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 16:01:45,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,995 INFO L134 CoverageAnalysis]: Checked inductivity of 29560 backedges. 2287 proven. 3165 refuted. 0 times theorem prover too weak. 24108 trivial. 0 not checked. [2020-07-21 16:02:04,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894257131] [2020-07-21 16:02:04,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:04,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:02:04,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985462934] [2020-07-21 16:02:04,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:02:04,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:04,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:02:04,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:02:04,998 INFO L87 Difference]: Start difference. First operand 416 states and 755 transitions. Second operand 35 states. [2020-07-21 16:02:11,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:11,162 INFO L93 Difference]: Finished difference Result 1089 states and 2306 transitions. [2020-07-21 16:02:11,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 16:02:11,166 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 998 [2020-07-21 16:02:11,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:11,175 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 16:02:11,175 INFO L226 Difference]: Without dead ends: 640 [2020-07-21 16:02:11,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2031 GetRequests, 1933 SyntacticMatches, 29 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=741, Invalid=4229, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 16:02:11,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-21 16:02:11,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 523. [2020-07-21 16:02:11,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 523 states. [2020-07-21 16:02:11,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 1033 transitions. [2020-07-21 16:02:11,208 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 1033 transitions. Word has length 998 [2020-07-21 16:02:11,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:11,208 INFO L479 AbstractCegarLoop]: Abstraction has 523 states and 1033 transitions. [2020-07-21 16:02:11,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:02:11,209 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 1033 transitions. [2020-07-21 16:02:11,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 797 [2020-07-21 16:02:11,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:11,218 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 59, 59, 38, 37, 30, 30, 30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 29, 23, 21, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:11,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:11,422 INFO L427 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:11,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:11,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1147779378, now seen corresponding path program 64 times [2020-07-21 16:02:11,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:11,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891769105] [2020-07-21 16:02:11,424 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:12,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:12,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:12,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1175 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:02:12,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:13,633 INFO L134 CoverageAnalysis]: Checked inductivity of 18657 backedges. 2179 proven. 1966 refuted. 0 times theorem prover too weak. 14512 trivial. 0 not checked. [2020-07-21 16:02:13,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:14,448 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 16:02:21,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:37,563 INFO L134 CoverageAnalysis]: Checked inductivity of 18657 backedges. 2181 proven. 2009 refuted. 0 times theorem prover too weak. 14467 trivial. 0 not checked. [2020-07-21 16:02:37,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891769105] [2020-07-21 16:02:37,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:37,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:02:37,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548878217] [2020-07-21 16:02:37,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:02:37,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:37,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:02:37,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:02:37,566 INFO L87 Difference]: Start difference. First operand 523 states and 1033 transitions. Second operand 35 states. [2020-07-21 16:02:42,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:42,778 INFO L93 Difference]: Finished difference Result 1142 states and 2264 transitions. [2020-07-21 16:02:42,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 16:02:42,784 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 796 [2020-07-21 16:02:42,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:42,792 INFO L225 Difference]: With dead ends: 1142 [2020-07-21 16:02:42,792 INFO L226 Difference]: Without dead ends: 591 [2020-07-21 16:02:42,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1619 GetRequests, 1529 SyntacticMatches, 29 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 865 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=564, Invalid=3342, Unknown=0, NotChecked=0, Total=3906 [2020-07-21 16:02:42,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2020-07-21 16:02:42,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 488. [2020-07-21 16:02:42,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 488 states. [2020-07-21 16:02:42,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 845 transitions. [2020-07-21 16:02:42,839 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 845 transitions. Word has length 796 [2020-07-21 16:02:42,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:42,839 INFO L479 AbstractCegarLoop]: Abstraction has 488 states and 845 transitions. [2020-07-21 16:02:42,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:02:42,839 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 845 transitions. [2020-07-21 16:02:42,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1095 [2020-07-21 16:02:42,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:42,857 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 79, 79, 55, 54, 42, 42, 42, 42, 42, 42, 42, 39, 39, 39, 39, 39, 39, 39, 30, 24, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:43,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:43,188 INFO L427 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:43,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:43,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1000737340, now seen corresponding path program 65 times [2020-07-21 16:02:43,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:43,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [599745641] [2020-07-21 16:02:43,189 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:44,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:44,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:44,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 1615 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:02:44,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:45,727 INFO L134 CoverageAnalysis]: Checked inductivity of 35592 backedges. 2200 proven. 3749 refuted. 0 times theorem prover too weak. 29643 trivial. 0 not checked. [2020-07-21 16:02:45,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:50,084 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:02:58,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:00,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:00,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:10,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:13,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:17,222 INFO L134 CoverageAnalysis]: Checked inductivity of 35592 backedges. 2204 proven. 3793 refuted. 0 times theorem prover too weak. 29595 trivial. 0 not checked. [2020-07-21 16:03:17,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [599745641] [2020-07-21 16:03:17,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:17,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:03:17,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861356673] [2020-07-21 16:03:17,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:03:17,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:17,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:03:17,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:03:17,225 INFO L87 Difference]: Start difference. First operand 488 states and 845 transitions. Second operand 35 states. [2020-07-21 16:03:24,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:24,022 INFO L93 Difference]: Finished difference Result 1295 states and 2482 transitions. [2020-07-21 16:03:24,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 16:03:24,028 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1094 [2020-07-21 16:03:24,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:24,038 INFO L225 Difference]: With dead ends: 1295 [2020-07-21 16:03:24,038 INFO L226 Difference]: Without dead ends: 801 [2020-07-21 16:03:24,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2222 GetRequests, 2125 SyntacticMatches, 29 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=726, Invalid=4104, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 16:03:24,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 801 states. [2020-07-21 16:03:24,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 801 to 571. [2020-07-21 16:03:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 16:03:24,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 1030 transitions. [2020-07-21 16:03:24,073 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 1030 transitions. Word has length 1094 [2020-07-21 16:03:24,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:24,074 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 1030 transitions. [2020-07-21 16:03:24,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:03:24,074 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 1030 transitions. [2020-07-21 16:03:24,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1071 [2020-07-21 16:03:24,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:24,089 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 73, 73, 55, 54, 43, 43, 43, 43, 43, 43, 43, 36, 36, 36, 36, 36, 36, 36, 32, 18, 18, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]